WARNING: If the information in these instructions
is not followed exactly, a fi re or explosion may result
causing property damage, personal injury or loss of life.
- Do not store or use gasoline or other fl ammable vapors
and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
•
Open all windows.
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do not use
any phone or cell phone in your building.
•
Extinguish any open fl ame.
•
Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
•
If you cannot reach the gas supplier, call the fi re
department.
– Installation and service must be performed by a
qualifi ed installer, service agency or the gas supplier.
25,000 - 35,000
BTU/hr.
MONTEREY HOME FURNACE
TOP VENT GAS WALL HEATER
WARNING: Do not install any of these furnaces
(natural or propane gas) in mobile/manufactured homes,
trucks or recreational vehicles.
WARNING: This product can expose you to
chemicals including epichlorohydrin which is known to the
State of California to cause cancer and birth defects and/or
other reproductive harm. For information go to
www.p65warnings.ca.gov
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause injury or
property damage. Refer to this manual. For assistance or
for additional information consult a qualifi ed installer or,
service agency.
SINGLE SIDED MODEL NUMBERS
(natural gas)
2509622A / 3509622A
(propane gas)
2509621A / 3509621A
DOUBLE SIDED MODEL NUMBERS:
(natural gas)
5009622A
(propane gas)
5009621A
SAVE THIS MANUAL FOR FUTURE REFERENCE.
READ THIS OWNER’S MANUAL CAREFULLY BEFORE YOU
INSTALL YOUR NEW WILLIAMS WALL FURNACE.
250 West Laurel Street, Colton CA 92324 • www.williamscomfortprod.com • 1-888-444-1212
MONTEREY HOME FURNACE
50,000 BTU/hr.
OWNER’S MANUAL
INSTALLATION INSTRUCTIONS
VISITEZ NOTRE SITE WEB POUR LA VERSION FRANÇAISE DE CE MANUEL
VISITE NUESTRA PÁGINA WEB PARA LA VERSIÓN EN ESPAÑOL DE ESTE MANUAL
www.williamscomfortprod.com/products/furnaces/
2
INSTALLATION RECORD
Model No. . Serial No.
Original Purchaser
Address
City and State Zip
Dealer
Address
City and State Zip
Installation Date Name Signature
(Dealer or authorized representative who certifies that this appliance is installed in accordance with Manufacturer’s instructions and local codes.)
WARRANTY
The manufacturer, Williams Furnace Co., warrants this wall furnace
or heater to the original purchaser under the following conditions:
ANY WARRANTY CONSIDERATIONS
ARE CONTINGENT ON INSTALLATION BY
A QUALIFIED INSTALLER (CONTRACTOR).
SELF-INSTALLATION IS PROHIBITED AND
WILL INVALIDATE YOUR WARRANTY.
LIMITED ONE-YEAR WARRANTY
1. Any part thereof which proves to be defective in material or
workmanship within one year from date of original purchase
for use will be replaced at the Manufacturer’s option, FOB to
its factory.
2. No liability is assumed by the Manufacturer for removal or
installation labor costs, nor for freight or delivery charges.
LIMITED EXTENDED WARRANTY
1. In addition to the above limited one year warranty on the
complete unit, any combustion chamber which burns out or
rusts under normal installation, use and service conditions
during a period of nine years following expiration of the
one-year warranty period will be exchanged for a like or
functionally similar part.
2. No liability is assumed by the Manufacturer for removal or
installation labor costs, nor for freight or delivery charges.
LIMITATIONS
1. THIS LIMITED WARRANTY IS THE ONLY WARRANTY MADE BY
THE MANUFACTURER, IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR
PURPOSE ARE LIMITED TO THE SAME ONE YEAR TERM AS
THE EXPRESS WARRANTY. UNDER NO CIRCUMSTANCES
SHALL THE MANUFACTURER BE LIABLE FOR INCIDENTAL,
CONSEQUENTIAL, SPECIAL OR CONTINGENT DAMAGES OR
EXPENSES ARISING DIRECTLY OR INDIRECTLY FROM ANY
DEFECT IN THE PRODUCT OR ANY COMPONENT OR
FROM THE USE THEREOF. THE REMEDIES SET FORTH
HEREIN ARE THE EXCLUSIVE REMEDIES AVAILABLE TO THE
USER AND ARE IN LIEU OF ALL OTHER REMEDIES.
Some states do not allow limitation on how long an implied
warranty lasts, and some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above
limitations or exclusions may not apply to you.
2.
This warranty does not include any charge for labor or installation.
3. This warranty does not extend to painted surfaces or to damage
or defects resulting from accident, alteration, misuses or abuse
or improper installation.
4. This warranty does not cover claims which do not involve
defective workmanship or materials.
DUTIES OF THE CONSUMER
1.
The heating equipment must be installed by a qualified installer
and operated in accordance with the installation and
homeowner’s instructions furnished with the equipment.
2. Any travel, diagnostic costs, service labor, and labor to repair
the defective unit will be the responsibility of the owner.
3. A bill of sale, canceled check, payment record or permit should
be kept to verify purchase date to establish the warranty period.
4. Have the installer enter the requested information in the
space below.
GENERAL
1. The manufacturer neither assumes nor authorizes any person
to assume for it any other obligation or liability in connection
with said equipment.
2. Service under this warranty should be obtained by contacting
your dealer. Provide the dealer with the model number, serial
number, and purchase date verification.
3. If, within a reasonable time after contacting your dealer,
satisfactory service has not been received, contact: Customer
Service Department, 250 West Laurel Street, Colton, CA 92324
for assistance.
4. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND
YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM
STATE TO STATE.
MONTEREY TOP VENT GAS WALL HEATER 3
WARRANTY
INSTALLATION RECORD
CONTENTS
SAFETY RULES
INTRODUCTION
BASIC MATERIALS NEEDED
BASIC TOOLS NEEDED
OPTIONAL ACCESSORIES
INSTALLING YOUR WALL FURNACE
LOCATING WALL FURNACE AND THERMOSTAT
COMBUSTION & VENTILATION AIR
RECESSED MOUNT INSTALLATION
SURFACE MOUNT INSTALLATION
VENT INSTALLATION
ATTACHING YOUR FURNACE
GAS SUPPLY AND PIPING
FRONT PANEL INSTALLATION
THERMOSTAT INSTALLATION
START UP PROCEDURE
STAY SAFE
OPERATING YOUR FURNACE
CARING FOR YOUR FURNACE
INSTALLING YOUR BLOWER ACCESSORY
INSTALLING YOUR MOTORIZED REAR OUTLET
BLOWER ACCESSORY 2901 REPLACEMENT PARTS & EXPLODED VIEW
BLOWER ACCESSORY 2907 REPLACEMENT PARTS & EXPLODED VIEW
MOTORIZED REAR OUTLET REPLACEMENT PARTS
TROUBLESHOOTING YOUR FURNACE
HINTS AND INFORMATION
INSTALLATIONS IN THE STATE OF MASSACHUSETTS
SERVICE RECORD
2
2
3
4
5
6
6
6
7
7
8
11
13
15
16
18
19
20
21
22
24
25
26
28
30
32
34
36
37
38
39
40
42
43
CONTENTS
Quick Reference
Here’s how to:
INSTALLING YOUR FURNACE
Recessed Mount, Surface Mount,
and Vent Installation are
explained starting on page 11.
OPERATING YOUR FURNACE
Igniting your furnace for the first time.
HOW TO CARE FOR YOUR FURNACE
Learn how to keep your new
Williams Furnace operating.
7
23
25
REPLACEMENT PARTS FOR 250 AND 350 SERIES
CONTROL ASSEMBLY REPLACEMENT PARTS FOR 250 AND 350 SERIES
REPLACEMENT PARTS FOR 500 SERIES
4
WARNING: Read these rules and the instructions
carefully. Failure to follow these rules and instructions
could cause a malfunction of the furnace. This could
result in death, serious bodily injury and/or property
damage. INSTALLATION MUST CONFORM TO LOCAL
CODES. IN THE ABSENCE OF LOCAL CODES,
INSTALLATION MUST CONFORM TO THE NATIONAL FUEL
GAS CODE, ANSI Z223.1. THE APPLIANCE, WHEN INSTALLED
MUST BE ELECTRICALLY CONNECTED AND GROUNDED IN
ACCORDANCE WITH LOCAL CODES OR, IN THE ABSENCE
OF LOCAL CODES, WITH THE CURRENT NATIONAL
ELECTRICAL CODE ANSI/NFPA NO. 70.
IN CANADA: Installation must conform to local codes or,
in the absence of local codes, the current CAN/CGA B149
Installation code. The appliance, when installed, must
be grounded in accordance with local codes, with the
current CSA C22.1 Canadian Electrical Code. Reference is
made in this manual regarding gas type as propane Be
advised that propane is not available in Canada; refer
to propane.
WARNING: Do not use this furnace if any part has
been under water. Immediately call a qualified service
technician to inspect the furnace and to replace any
part of the control system and any gas control which has
been under water.
1. Use only manufacturer’s replacement parts. Use of any
other parts could cause injury or death.
2. DO NOT install the furnace where it could be isolated by
closing doors to the heated space.
3. DO NOT install these furnaces in a travel trailer,
recreational vehicle or mobile home.
4. MAINTAIN all clearances specified in section “Locating
Wall Furnace and Thermostat” and “Vent Installation.”
5. BE SURE the furnace is for type of gas being used. Check
the nameplate by the gas valve in the lower cabinet.
Do not change it to use other gases without the proper
manufacturer’s gas conversion kit.
6. For natural gas, the minimum inlet gas supply pressure
for the purpose of input adjustment is 5” water column.
The maximum inlet gas supply pressure is 7” water
column.
7. Any safety screen, guard or parts removed for servicing this
appliance must be replaced prior to operating the
appliance to avoid property damage, bodily injury or death.
8. Vent the furnace directly to the outdoors, so that harmful
gases will not collect inside the building. Follow the
venting instructions for your type installation exactly. Use
only the type and size of vent pipe and fittings specified.
9. Provide for adequate combustion and ventilation air. See
page 7. The flow of this air to the furnace must not be blocked.
10. NEVER vent flue gases into another room, a fireplace
or any space inside a building. This could cause property
damage, bodily injury or death.
11. NEVER test for gas leaks with an open flame. Use a soap
solution to check all gas connections. This will avoid the
possibility of fire or explosions.
12. ALLOW furnace to cool before servicing. Always shut off
electricity and gas to furnace when working on it. This
will prevent any electrical shocks or burns.
13. DUE TO HIGH TEMPERATURES, locate the furnace out of
traffic and away from furniture and draperies.
14. ALERT children and adults to the hazards of high surface
temperatures and warn them to keep away to avoid
burns or clothing ignition.
15. CAREFULLY supervise young children when they are in
the same room with the furnace.
16. DO NOT place clothing or other flammable material on
or near furnace.
17. INSTALLATION and REPAIR must be done by a qualified
service person. The appliance should be inspected
before use and at least annually by a professional service
person. More frequent cleaning may be required due
to excessive lint from carpeting, bedding material, etc.
It is imperative that control compartments, burners and
circulating air passages be kept clean.
18. BEFORE INSTALLING: To avoid electrical shock, turn off
electrical circuits that pass through the wall where you
are going to install the furnace.
19. BE AWARE of good safety practices by wearing personal
protective equipment such as gloves and safety glasses
to avoid being injured by sharp metal edges in or around
the furnace while cutting or drilling holes in wood and/or
sheet metal.
20. CAUTION: Label all wires prior to disconnection when
servicing controls.
21. DO NOT store or use gasoline or other flammable liquids
or vapors near the furnace.
WARNING: Do not install any of these furnaces in
mobile homes, trailers or recreational vehicles.
SAFETY RULES
MONTEREY TOP VENT GAS WALL HEATER 5
INTRODUCTION
The following steps are all needed for proper installation
and safe operation of your furnace. If you have any doubts
as to any requirements, check with local authorities. Obtain
professional help where needed. All of the checks and
adjustments in the Start-Up Procedures are vital to the
proper and safe operation of the furnace. Please read the
instructions before you install and use your furnace. This will
help you obtain the full value from this furnace. It could also
help you avoid needless service costs if the answer to the
problem is found within this instruction manual.
Always consult your local heating or plumbing inspector,
building department or gas utility company regarding
regulations codes or ordinances which apply to the
installation of a vented wall furnace.
Check the furnace nameplate, located in the burner
compartment, to make sure your furnace is equipped
to operate on the type of gas available (either natural or
propane gas). DO NOT convert the furnace from natural gas
to propane gas or from propane gas to natural gas without
the proper manufacturer’s gas conversion kit.
Combustion air is drawn in from the room where the
furnace is located and is vented out of the top of the
furnace vertically through vent piping in the stud space to a
roof vent top. Vent material is not supplied with the furnace.
This furnace is equipped with a vent safety shutoff
system designed to protect against improper venting of
combustion products. Operation of this wall furnace when
not connected to a properly installed and maintained
venting system or tampering with the vent safety shutoff
system can result in carbon monoxide (CO) poisoning and
possible death.
The efficiency rating of this furnace is a product thermal
efficiency rating determined under continuous operating
conditions and was determined independent of any
installed system.
1) Seal any unused openings in the venting system.
2) Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or the Natural Gas
and propane Installation Code, CSA B149.1 and
these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
3) As far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system
are located and other spaces of the building.
4) Close fireplace dampers.
5) Turn on clothes dryers and any appliance not
connected to the venting system. Turn on
any exhaust fans, such as range hoods and
bathroom exhausts, so they are operating at
maximum speed. Do not operate a summer
exhaust fan.
WARNING: CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance connected to the venting system being placed
into operation could result in carbon monoxide poisoning or death.
The following steps shall be followed for each appliance connected to the venting system being placed into operation,
while all other appliances connected to the venting system are not in operation:
6) Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7) Test for spillage from draft hood equipped appliances
at the draft hood relief opening after 5 minutes
of main burner operation. Use the flame of a match
or candle.
8) If improper venting is observed during any of the
above tests, the venting system must be corrected
in accordance with the national fuel gas code,
ANSI Z223.1/NFPA 54 and/or Natural Gas and propane
Installation Code, CSA B149.1.
9) After it has been determined that each appliance
connected to the venting system properly vents
when tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other
gas-fired burning appliance to their previous
conditions of use.
6
Basic Materials Needed
Pipe and fittings to make gas connections to the furnace.
Vertical venting materials. See page 15, Figure 8.
Pipe joint compound resistant to propane.
Electrical wiring supplies as needed. Minimum wire size is
#14 gauge copper.
Basic Tools Needed
Hand drill or properly grounded electric drill
Expansion bit 1/2” to 1-5/8” or 1/2” and 1-1/2” blade bits
1/8” and 3/16” drill bit (metal)
6 ft. folding rule or tape measure
Screwdriver (medium blade)
Screwdriver (Phillips and Flat Head)
Pliers (wire cutting)
Hammer
Stud Locater or small finishing nails
Tin Snips
8" adjustable wrench
12" adjustable wrench
7/8" wrench
3/4" wrench
1" wrench
Gloves and safety glasses
Helpful Installation Information
The following booklets will help you in making the installation:
ANSI/NFPA 70, or current edition “National Electrical Code”.
In Canada: CSA C22.1 Canadian Electrical Code.
American National Standard Z223.1 or current edition of the
“National Fuel Gas Code.”
Obtain from the American National Standard Institute, Inc.,
1430 Broadway, New York, NY 10018. In Canada, CAN/CGA B149.
Optional Accessories
Blower Accessories 2901, 2907 - May be used on all models
and mounts on top of a furnace. This blower increases
circulation of warm air through the heated space. A 115V
outlet adjacent to the furnace is required.
Trim Strip Kit 4701 - Provides a finished edge for sides of the
wall furnace.
Free Standing Accessory 4901 - May be used with single
sided models. This accessory allows the furnace to be
mounted on the surface of a wall.
Vent Adapter Kit 9902 - Optional vent adapter, typically used
when the furnace is vented into a properly lined chimney.
Rear Outlet Registers 6901, 6919, 6920 - May be used with
single sided models when recessed into a standard 2x4
inch interior stud partition. This accessory directs some of
the heated air into the room opposite the one in which the
furnace is installed.
Oval B/W Vent Kit 9929 - This U.L. listed B/W vent kit
contains four feet of oval, double walled vent pipe, plate
spacers and base or hold-down plate that starts the venting
from the top of furnace. See Vent Installation on page 15 for
additional items you will need.
Plaster Ground Kit 6905 - Used for 6901 or 6919 Rear
Outlet Registers.
Gas Conversion Kits - See page 18.
Thermostat - See page 20.
INTRODUCTION
MONTEREY TOP VENT GAS WALL HEATER 7
The following steps are needed for proper installation and
safe operation of your furnace. If you have any doubts as to
any requirements, obtain professional help. Remember to
ALWAYS consult your local heating or plumbing inspector,
building department or gas utility company regarding
regulations, codes, or ordinances which apply to the
installation and location of a vented wall furnace.
IMPORTANT
For satisfactory and trouble-free operation, be sure to:
1. Locate the furnace properly within the space to be
heated.
2. Install the furnace in accordance with local codes or
ordinances and instructions provided. In the absence
of local codes or ordinances, install the furnace to
conform with the current edition of the National Fuel Gas
Code, NFPA 54, ANSI Z223.1/Canadian Installation Code,
CAN/CGA B149.
3. Maintain minimum clearances: Floor 2½-inches, ceiling
16- inches, side wall 1-inch.
4. Provide enough combustion and ventilation air.
LOCATING WALL FURNACE & THERMOSTAT
(NOT INCLUDED)
The furnace is installed between 2 x 4 inch wall studs spaced
on 16-inch centers or a stud space that can be framed in to
16-inches.
Consider the following points before attempting to install
the furnace:
CAUTION: Do not make cutouts in the wall or ceiling
before checking in the attic for ceiling joist locations and
proposed venting.
FIGURE 1 – MINIMUM SPACING
1. Locate the furnace near the center of the space to be
heated for good air circulation. Do not put it behind a
door or draperies. Do not install the furnace where it
could be isolated by closing doors to the heated space.
Do not locate the furnace where a door could swing over
the front panel or where circulation could be retarded by
furniture or cabinets.
2. Check the minimum spacing needs as shown in Figure 1.
3. The top of the furnace must be at least 16-inches from
the ceiling.
4. When the furnace is properly installed with legs resting
on the floor plate, it sets the dimension from the face
panel to the bare floor. (Approximately 2½-inches
depending on the thickness of floor plate).
5. A protective barrier (metal or wood), cut to match the
width and depth of the furnace, should be used to cover
over any floor coverings such as carpet or vinyl under the
furnace. At no time should the dimension from the
bottom of the face panel to the protective barrier be less
than 1½- inches.
6. In the space to be heated, the side of the furnace may
be as close as 1-inch to an intersecting wall. The recessed
portion may have 0-inches clearance to combustible
material.
7. Select a location that will provide adequate accessibility
clearance for servicing and proper operation.
8. After picking a location, inspect the wall, floor, attic and
roof areas. Make sure there are no pipes, wiring, bracing,
etc., that will interfere with furnace or vent installation. If
required, move them or pick a new installation location.
9. Be sure that gas piping and electrical wiring can be
brought to the location. Electrical wiring is required for
optional blower accessory.
10. If installing the thermostat (not included) on the wall,
locate the thermostat approximately 5-feet above the
floor on an inside wall where it will sense the average
room temperature.
INSTALLING YOUR FURNACE
7ʹ MIN.
BARE
FLOOR
1ʺ MIN. TO
CLOSEST
SIDE WALL
WALL
FURNACE
WALL
APPROX. 2½ʺ
16ʺ MIN.
30”
Wall
8
The thermostat (not included) should be sensing average
room temperature; avoid the following:
HOT SPOTS:
Concealed pipes or ducts
Fireplaces
Registers
TV sets
Radios
Lamps
Direct sunlight
Kitchen
After picking a location that meets the requirements, check
the walls, attic and roof to make sure there are no obstructions
such as pipes, electrical wiring, etc., which could interfere with
the installation of the furnace or vent pipe. If required, move
them or pick a new location.
WARNING: Danger of property damage, bodily
injury or loss of life. Do not install the furnace in any area
where oxygen is in use.
Combustion & Ventilation Air
When an existing category I heater is removed or replaced,
the original venting system may no longer be sized to properly
vent the attached appliances.
The following steps shall be followed for each appliance
connected to the venting system being placed into operation,
while all other appliances connected to the venting system are
not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or the natural gas and propane
Installation Code, CSA 8149.1 and these instructions.
Determine that there is no blockage or restriction,
leakage, corrosion and other deficiencies which could
cause an unsafe condition.
3. As far as practical, close all building doors and windows
and all doors between the space in which the
appliance(s) connected to the venting system are located
and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected
to the venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they are
operating at maximum speed. Do not operate a summer
exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances
at the draft hood relief opening after 5 minutes of main
burner operation. Use the flame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in
accordance with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 and/or natural gas and propane Installation
Code, CSA 8149.1
9. After it has been determined that each appliance
connected to the venting system properly vents when
tested as outlined above, return doors, windows, exhaust
fans, fireplace dampers and any other gashed burning
appliance to their previous conditions of use.
WARNING: Danger of property damage, bodily
injury or loss of life. The furnace and any other fuel-
burning appliances must be provided with enough fresh
air for proper combustion and ventilation of flue gases.
Most homes will require that outside air be supplied into
the heated area.
The high cost of energy for home heating has brought about
new materials and methods used to construct or remodel most
current homes. The improved construction and additional
insulation has reduced the heat loss and made these homes
much tighter around windows and doors so that infiltrated air
is minimal. This creates a problem to supply combustion and
ventilation air for gas-fired or other fuel burning appliances.
Any use of appliances that pull air out of the house (clothes
dryers, exhaust fans, fireplaces, etc.) increases this problem and
appliances could be starving for air.
The combination of a tight energy efficient home with the use
of exhaust fans, fireplaces, clothes dryers, and gas appliances
result in more and more air being drawn from the house until
fresh air may be sucked back into the house down a furnace
flue or fireplace chimney. Carbon monoxide can be the result.
Carbon monoxide (CO) is a colorless, odorless gas produced
when fuel is not burned completely or when the flame does
not receive sufficient oxygen. Automobiles, charcoal, wood fires
and improperly vented or air-starved coal, oil and gas furnaces
or other appliances can produce carbon monoxide.
Do not install furnace in the same room or near a wood solid
fuel burning fireplace.
BE AWARE OF THESE AIR-STARVATION SIGNALS:
1. Headaches, nausea, dizziness.
2. Excessive humidity shown by heavily frosted windows or
a moist “clammy” sensation.
3. Fireplace smoke fills the room or will not draw.
4. Furnace flue backs up.
INSTALLING YOUR FURNACE
COLD SPOTS:
Concealed pipes or ducts
Stairwell - drafts
Door - drafts
Unheated rooms on
other side of wall
DEAD SPOTS:
Behind doors
Corners and alcoves
WARNING: CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance
connected to the venting system being placed into
operation could result in carbon monoxide poisoning or
death.
MONTEREY TOP VENT GAS WALL HEATER 9
AIR REQUIREMENTS
The requirements for providing air for combustion and
ventilation are listed in the National Fuel Gas Code NFPA
54/ANSI Z223.1 (in Canada: CAN/CGA B149). Most homes
will require that outside air be supplied to the heated area
by means of ventilation grilles or ducts connecting directly
to the outside or spaces open to the outdoors such as attic
or crawl space. The only exception is when the heated area
meets the requirements and definitions for an unconfined
space with adequate air infiltration.
All air openings and connecting ducts must comply with
the following:
If the furnace is installed in an area with another gas
appliance(s), the total input rating of all appliances must be
considered when determining the free area requirements
for combustion and ventilation air openings.
Ducts must have the same cross-sectional area as the free
area of the openings to which they connect. The minimum
dimension of rectangular air ducts must not be less than
3-inches in length or height.
WARNING: Danger of property damage,
bodily injury or loss of life. Even when a house meets
requirements for unconfined space with adequate air
infiltration, it is recommended that a fresh air intake be
installed to lessen the possible dangers from any future
changes on the home.
LOUVERS / GRILLES AND SCREENS COVERING FREE
AREA OPENINGS
If a screen is used to cover the opening(s), it must not be
smaller than 1/4-inch mesh. Use the free area of a louver or grille
to determine the size opening required to provide the free area
specified. If the free area is not known, assume a 20% free area
for wood and a 60% free area for metal louvers or grilles.
INFILTRATION AIR
If your furnace is in an open area (unconfined space), the air
that leaks through the cracks around doors and windows
may be enough for combustion and ventilation air. The doors
should not fit tightly. The cracks around windows should not
be caulked or weather stripped.
Spillage means air starvation. A fresh air duct or air intake
opening must be installed to provide air directly to the
furnace or other gas appliances.
If spillage exists or when the furnace is in a building of tight
construction where the windows and doors are weather
stripped, air for combustion and ventilation must be
obtained from outdoors or space open to the outdoors.
To determine if infiltration air is adequate, perform the
following checks:
1. Close all doors and windows. If you have a fireplace, start
a fire and wait until flames are burning vigorously.
2. Turn on all exhausting devices, i.e., kitchen and bathroom
exhaust fans; water heaters (gas and electric).
If you have a fireplace, open a window or door near the
fireplace and then check for spillage. If spillage stops, do not
use the fireplace without a nearby window or door open until
you can supply fresh air by a permanent duct.
If you have kitchen and bathroom exhaust fans, turn them
off and check for spillage. If spillage stops, do not use exhaust
fans (circuit breakers for fans should be turned off) until you
can supply fresh air by a permanent duct.
Provide opening(s) having a total free area of one-square-
inch per 4,000 BTU/hr. of the total combined input ratings
for all appliances in the area. The required free area is shown
in Figure 3. This fresh air opening or duct must terminate at
a point not more than one-foot above the floor. It must have
at least one-square inch of free area for each 4,000 BTU/hr. of
input of all appliances in area.
3. Turn on all vented gas appliances, i.e., heating equipment
(includes any room heaters), water heaters.
4. Wait ten (10) minutes for drafts to settle.
5. Check for draft hood spillage at each appliance. Hold a lit
match two-inches from the draft opening. (Figure 2).
A. No Spillage If the match flame pulls toward
draft hood, this indicates sufficient infiltration air. Return
exhausting devices and appliances to the condition you
found them.
B. Draft Hood Spills If there is spillage at a draft hood
(match goes out or flame wavers away from draft hood),
check for plugged flue connectors and chimneys. Repair
blockage and test again.
FIGURE 3 – FREE AREA
Free Area in Square Inches.
Each opening is based on one square inch per 4,000 BTU/hr
BTU/hr input
30,000
35,000
40,000
45,000
50,000
60,000
Square inches
of opening
7.5
8.75
10.00
11.25
12.50
15.00
1 - 1/2ʺ
7
8
9
10
11
13
2ʺ
4
5
5
6
8
8
3ʺ
2
2
3
3
3
4
Required number of holes
sill or header plates
FIGURE 2 – DRAFT HOOD SPILLAGE
DRAFT HOOD
OPENING
(match or
smoke pen)
VENT PIPE
TYPICAL WATER
HEATER
VENT PIPE
WALL
FURNACE
DRAFT HOOD
OPENING
(match or
smoke pen)
10
HOLE PLACEMENT - EXAMPLE
FURNACE LOCATED IN UNCONFINED SPACE
An unconfined space must have a volume of a minimum 50
cubic feet per 1,000 BTU/hr. of the total combined input of
all appliances in the area. Adjoining rooms may be included
only if there are no doors between the rooms or if special
provisions are made such as ventilation grilles installed
between connecting rooms. Figure 4 outlines the minimum
area in square feet, based on 8-foot ceiling heights for various
BTU/hr. input ratings.
FIGURE 4 - MINIMUM AREA
EXAMPLES OF GRILL PLACEMENT
FURNACE LOCATED IN CONFINED SPACE
If a furnace is installed in a confined space, it must be
provided with free air for proper combustion and ventilation
of flue gases by one of the following methods:
A. AIR FROM INSIDE THE BUILDING
If the confined space adjoins an unconfined space, provide
two permanent openings. One within 12-inches of the top
and another within 12-inches of the bottom of the room
directly connected to the unconfined space. Each opening
must have a free area of at least 100-square inches or 1-square
inch per 1,000 BTU/hr. of input for all appliances combined.
WARNING: Danger of property damage, bodily
injury or death. The adjoining unconfined space must
have adequate air infiltration.
B. AIR FROM OUTDOORS
If confined space does not adjoin an unconfined space, then
air must be provided from outdoors or spaces open to the
outdoors such as an attic or crawl spaces.
Openings for inlet or outlet air should NOT be made into an
attic area if the attic is equipped with a thermostat controlled
power vent.
Provide two permanent openings, one within 12-inches of
the top and bottom of the room connecting directly to, or by
using ducts, with the outdoors or areas open to fresh air.
If the opening connects directly to, or with vertical ducts, the free
area of each opening must be at least 1-square inch per 4,000
BTU/hr. of the combined input of all appliances in the area.
If horizontal ducts are used, the free area of each opening
must be at least 1-square inch per 2,000 BTU/hr. of the
combined input of all appliances in the area.
HOLES FROM VENTILATED
ATTIC INTO STUD SPACE
AIR GRILLS TO STUD SPACE
12ʺ MAX FROM FLOOR
HOLES FROM VENTILATED
CRAWL SPACE INTO STUD SPACE
HOLES IN BOTTOM ON BACK OF FURNACE INTO OPEN
STUD SPACE OR CRAWL SPACE
4,000 BTU/hr. per
square inch opening
Round duct dia.
4ʺ
4ʺ
4ʺ
4ʺ
4ʺ
4 ½ʺ
Rectangular
square duct size
3ʺ x 3ʺ
3ʺ x 3ʺ
3ʺ x 4ʺ
3ʺ x 4ʺ
3ʺ x 5ʺ
3ʺ x 5ʺ
*Uncontained space
min. area in sq. ft.
8ʼ ceiling height
145
219
240
281
312
375
Max.
BTU/hr input
30,000
35,000
40,000
45,000
50,000
60,000
* Can be two or more rooms separated by ventilation gas fire.
VENTILATION GRILLES CONNECTING TWO
ROOMS TO MEET UNCONFINED SPACE
100 SQ IN
200 SQ IN
MINIMUM
BETWEEN
LARGE
ROOMS
100 SQ IN
RECOMMENDED FRESH AIR DUCT INTO CRAWL
SPACE IN FURNACE AREA OR IN CLOSET WITH
WATER HEATER
VENTILATION
GRILLES
INTO CLOSET
FOR HOT
WATER
HEATER
INSTALLING YOUR FURNACE
MONTEREY TOP VENT GAS WALL HEATER 11
WARNING: Danger of illness, bodily injury or death.
Draft hood spillage, with unobstructed vents, indicates
that additional air must be brought into the structure
from the outside. Keep a window open (minimum
2-inches near the appliance until a permanent air duct
is installed.
FIGURE 5A - RECESSED WALL MOUNT INSTALLATION
FIGURE 5B - CUT WALL OPENING
EXAMPLES OF AIR INLETS AND OUTLETS
Recessed & Internal Wall Mount
Installation
Recessed wall mount installation on single sided models:
2509621A, 2509622A, 3509621A, 3509622A.
The maximum recess depth from rear of furnace forward
is 4½-inches.
Internal Wall Mount Installation - Dual Sided Models:
5009621A, 5009622A
NOTE:
1. The dual sided models should be installed only to an
internal wall (between two rooms) and not an outside/
external wall.
2. The placement should be such that the wall is in-between
two face panesl (ref. Figure 9B).
FIND THE STUDS AND CEILING JOINTS
Use a stud locater or small finishing nails. Repeatedly drive
and remove a nail into the wall in the area of the stud until
it is located. Then find the inside edge of the stud. Leave the
nail at this location.
The other stud should be about 14½-inches from the one
found. Drive finishing nails on the inside of this stud. Draw
wall cutout to required size as shown in Figure 5A, 5B. If wall
studs are not on 16-inch centers. See “CLOSE OFF STUD
SPACE.” Figure 6
CHIMNEY OR GAS VENT
VENTILATED
ATTIC
OUTLET AIR
OUTLET AIR
INLET AIR
INLET AIR
VENTILATED
CRAWL SPACE
10 CRAWL
SPACE
WALL
FURN
TO
ATTIC
12
OPTIONAL INLET AIR 1 SO
INCH PER 4,000 BTU/hr.
100 SQ
INCHES
EACH
1 SQ INCH
PER 4,000 BTU/hr.
MAX
12
CUT WALL OPENING
Cut wall opening 14⅜-inches wide and 66⅛-inches high
measured from the top of the floor plate. Figure 5A, 5B.
All corners must be square.
INSTALLATION OF REAR OUTLET REGISTER
(SINGLE SIDED MODELS ONLY)
The optional rear outlet register may be installed when the furnace
is recessed into the wall. In new construction, install the rear outlet
plaster ground at the same time you install the header plate. For
existing construction, make the necessary cutout and install the
plaster ground before you install the furnace. See instructions
packed with accessory and Figure 5A.
Do not allow wall finish material to project into the furnace recess.
Do not install rear outlet register where grille may be blocked by a
door, curtains or any other obstruction.
GAS SUPPLY OPENING
A hole must be drilled for the gas line. Decide whether the gas line
will come through the floor or wall. Drill a 1½-inch hole through the
floor or wall as needed. Figure 5A, 5B.
CAUTION: Be careful not to damage any furnace components
while making any alternate hole.
B-W VENT
BASE PLATE
PLASTER TO TOP OF HEADER
PLASTER GROUND REAR
REGISTER OPTIONAL FOR
SINGLE BURNER MODELS ONLY
PLASTER GROUND
NAIL
FLANGE
8 1/8ʺ X 13 1/4ʺ
CUTOUT
REAR
OUTLET
REGISTER
OPENING
115.V OUTLET
FOR OPTIONAL
BLOWER
TOP OF HEADER
2ʺ x 4ʺ
PLATE
ALTERNATE
GAS STUB
LOCATION
14 3/8ʺ
A = 4ʺ
MODELS
25,000 &
35,000
BTU/HR.
BOTTOM OF HEADER
NAILING FLANGE
9 1/8ʺ
62 1/4ʺ
3 3/4ʺ
2ʺ x 4ʺ STUDS
TOP OF
HEATER
FINISHED
FLOOR
2 X 4
FLOOR
PLATE
14 3/8ʺ
66 1/8ʺ
GAS STUB
LOCATION
HEADER ASSEMBLY
14 3/8ʺ
(368mm)
66 1/8ʺ
(1679mm)
WALL OPENING
GAS STUB
LOCATION
A = 2 5/8ʺ
MODELS
50,000
BTU/HR.
12
FIGURE 7 – CEILING PLATE OPENING
CLOSE OFF STUD SPACE (IF REQUIRED)
If studs are not on 16-inch centers, cut the hole for the
furnace next to an existing stud and frame in the other
side using a 2 x 4 and spacer blocks as required. Figure 6
EXISTING STUD
SPACER
BLOCKS
AS REQ’D
FIGURE 6 – CLOSE OFF STUD SPACE
CEILING PLATE
EXISTING STUD
FLOOR PLATE
NEW STUD
14 3/8ʺ
CEILING PLATE OPENING
Cut away the ceiling plate between the studs where the
furnace is to be installed. Work from the top in the attic. If there
is no access to the top, remove the wall covering between the
two wall studs all the way to the ceiling. Work through this
opening. Cut out the entire plate so the plate edges will be even
with the inner face of the 2 x 4 studs. Figure 7
INSTALL VENT BASE PLATE (HOLD-DOWN PLATE)
Position base plate on top of header plate and fasten with
screws. Note: Hold down plate is not included.
HEADER PLATE (VENT SUPPORT)
Measure upward 62¼-inches from the top of the floor plate.
Place a mark on each stud at this distance. Figure 5A, 5B. Place
the header plate between the studs with the lower edges even
with marks on the studs. Make sure header plate is level.
Locate rear edge of nailing tabs at back of the header. Nail
header plate to the 2 x 4 studs which will center the vent collar
in the wall. Figure 5A, 5B
INSTALL CEILING PLATE SPACER
Nail the ceiling plate spacers either across or in between the
cut out section of ceiling plate. If nailed between, ends must
be bent at 90 degrees. They must be fastened along each long
edge of the ceiling plate hole to hold the oval vent pipe in the
center of the hole. Ceiling plate spacers preserve structural
strength and position oval vent pipe in the center of the cut out
opening. Ceiling plate spacers are not included. Figure 7
CEILING PLATE
SPACERS NAILED
IN BETWEEN
CEILING PLATES
OR ACROSS FACE
IF ACCESSIBLE
PLATE SPACER
CEILING PLATE
14 3/8ʺ
2 X 4 STUD
2 X 4 STUD
INSTALLING YOUR FURNACE
MONTEREY TOP VENT GAS WALL HEATER 13
Surface Mount Installation
The use of the optional Free Standing Accessory No.
4901 allows single-sided furnaces to be surface mounted
instead of recessed into a wall. This is ideal for remodeling
existing masonry wall construction or when studding is
substandard. This kit drastically cuts installation time and
eliminates the expense of cutting into the walls and ceiling
plates. Be sure this accessory is of the type and design
required for the use with your furnace.
NOTE: After picking a location that meets the
requirements, check the wall, attic, and roof to make sure
there are no obstructions such as pipes, electrical wiring,
etc., which could interfere with the installation of the
furnace or vent pipe. If required, move them or pick a
new location.
FIND THE WALL STUDS OR CEILING JOISTS
Find two studs or joists at the spot where the furnace is
to be located. Use a stud locater or small finishing nails.
Repeatedly drive and remove a nail into the wall or ceiling
in the area of the stud or joust until you find it. Then find
the its side and leave the nail there. Drive another nail just
on the other side other the same stud or joist.
The inside of the next stud or joist should be about 14½
inches from the first one found. Drive a nail on the inside of
this stud or joist.
Using the nails as a guide, draw two lines down the side of
the wall from the ceiling to locate the furnace and ceiling
hole cutout for venting.
FREE STANDING ACCESSORY ASSEMBLY & INSTALLATION
1. Attach the base plate panel as shown in Figure A to the
bottom of the side rails with four (4) # 6, ⅜” screws.
2. Attach the header plate, (included with the furnace), to
the side rails using four (4) #8, ⅜” screws. Flanges of the
header plate go against the wall. Figure A
3. Install extension side rails as shown in Figure A, by
telescoping them inside the lower side rails. Adjust the
extension side rails by sliding them up or down to
ceiling height. Maximum: 8 feet 9 inches, Minimum:
7 feet 9 inches.
4. If the wall has a baseboard, cut the baseboard out to fit
against the side rails. Stand the side rails against the
wall and fasten them to the wall securely with screws
or bolts in the holes provided. Use a level to assure the
enclosure is plumb. Screws and bolts for wall
fastening are not included.
5. After positioning the enclosure, cut a 3½ X 14 inch hole
in the ceiling, centered between the studs or joists as
shown in Figure B.
6. Cut ¼ inch off each end of the ceiling spacer plate.
Place the ceiling spacer plate to the back of the wall
and centered in the enclosure as shown in Figure C.
7. Install Type B/W vent though the roof and studs or
joists in accordance with the installation instructions
packed with the furnace and local codes. See Vent
Installation, page 15.
8. Set the furnace body into position. Figure 9A page 16.
The furnace legs will rest on the bottom of the base
plate panel. Utilizing the holes provided in the furnace
legs, secure the furnace to the brackets attached to the
bottom panel with two (2) #10, ¾” screws.
9. Install the vent enclosure panel, fastening it to the side
rails with six (6) #6, ⅜” screws. Trim the bottom of the
panel to fit the header plate.
10. Install gas inlet through the back wall or one of the two
holes provided in the bottom base plate panel.
Figure D Connect gas line to furnace. See Gas supply
and Piping, page 17.
11. Install furnace face panel. See Front Panel Installation,
page 19. NOTE: The panel recesses ¼-inch between the
vertical edges of the enclosure.
FIGURE A
HEADER PLATE
SIDE RAIL
SIDE RAIL
BASE PLATE PANEL
14
FIGURE B
FIGURE D
FIGURE C
VENT INSTALLED
FRONT PANEL INSTALLED
STUD WALL
CENTERED
14ʺ
3 - 1/2ʺ
STUD WALL
GAS STUB LOCATIONS
STUD WALL
STUD WALL
16ʺ
4 - 7/16ʺ
A
PLUMBERS
TAPE
B-W VENT PIPING
CEILING PLATE SPACER
VENT
HOLD DOWN
PLATE
HEADER
FURNACE
SIDE RAIL
BASE PLATE
PANEL
INSTALLING YOUR FURNACE
MONTEREY TOP VENT GAS WALL HEATER 15
Vent Installation
The vent installation must comply with all local codes and
ordinances. If in doubt, consult your local codes or inspector.
The furnace vent must be directed to the outdoors so that
harmful combustion gases will not collect inside the building.
This furnace must not be connected to a chimney flue
serving a separate solid-fuel burning appliance.
This product is design certified to ANSI Z21.86. It must be
installed with a U.L. tested and listed type “B” approved vent
and type “B/W” approved vent Figure 8 Older style terra-
cotta, transite pipe, clay, concrete or masonry type vent pipe
cannot be used with this appliance. These types of vent
pipe will not heat fast enough to establish a draft, which will
result in improper venting of combustion products.
FIGURE 8 – TYPICAL VENT INSTALLATION
VENT CAP MUST BE MINIMUM 2 FEET
HIGHER THAN ANY POINT WITHIN
10 FEET OF THE VENT CAP
10 FEET
LISTED
VENT CAP
STORM
COLLAR
ROOF
FLASHING
HEIGHT FROM HEADER PLATE
TO THE VENT CAP TOP MUST
BE 6 FEET MINIMUM
1 INCH MIN. CLEARANCE TO COMBUSTIBLES
LISTED 4ʺ ROUND B VENT
OVAL TO ROUND
ADAPTER
OVAL B/W VENT
(DOUBLE WALL)
PLATE SPACER
(RECESSED MOUNT)
2 REQUIRED
BASE PLATE (HOLD DOWN)
OR STARTER PLATE SCREWED
DOWN TO HEADER PLATE
NOTE: THESE PARTS ARE SUPPLIED WITH THE FURNACE
GASKET
HEADER PLATE AND GASKETS
PROVIDED WITH FURNACE
50,000 BTU/hr. MODEL SERIES AND HEADER NOT SHOWN
FLUE COLLAR GASKET NOT REQUIRED ON 500 MODEL SERIES
FIGURE 8 – ALTERNATIVE VENTING
IF VENT EXTENDS OVER 5 FEET
ABOVE ROOF, GUY OR BRACE.
SEAL AROUND COLLAR
AND FLASHING
MAINTAIN LISTED
CLEARANCE
LOCK JOINTS
SUPPORT LATERALS
MAXIMUM VERTICAL RISE
MAINTAIN
LISTED
CLEARANCE
SUPPORT IF
NECESSARY
TYPE B ROUND OR OVAL
INSULATION SHIELD,
IF ATTIC IS INSULATED
ATTACH
HEADER
PLATE
MINIMUM
HEIGHT
12 FEET
FIRE STOP
SPACE
MULTISTORY
UPPER FLOORS
SHEET
METAL
SLEEVE
CEILING
SPACER
SINGLE STORY
OR FIRST FLOOR
OF MULTISTORY
SEAL AND
BASE PLATE
HEATER HEADER
PLATE
16
If an existing gas line is preventing the installation of a
Williams Furnace, a cut-out may be made using tin snips on
one of the legs to clear this existing gas line. This cut-out will
be on one side of the unit on the rear side of
the leg and only if necessary.
FIGURE 9A – INSERT FURNACE
FIGURE 9B – DUAL FURNACE
FIGURE 10 – NAIL PLACEMENT
25,000 - 35,000 BTU/hr. MODELS
B/W VENT
BOTTOM OF
FURNACE
NAIL FURNACE LEG TO
STUD OR FLOOR PLATE
(SEE DETAIL BELOW)
FLOOR PLATE
LEG
NAIL AT ANGLE
BOTTOM OF FURNACE
INSTALLING YOUR FURNACE
Consequently, this could cause the vent safety control
system to shut down the furnace.
The area above header within the stud space MUST be kept
clear of any attic insulation to allow the free circulation of
air around the oval vent piping. In some areas the building
code requires the use of an attic shield.
The B/W vent must extend through the ceiling and roof
terminating at least 12-feet above the finished floor on
which the furnace rests.
INSTALL FURNACE VENT
Attach a 4-foot length of oval, double-wall vent pipe
through the plate spacers to the hold-down plate. Push
the vent pipe into the hold-down plate until it is completely
seated. The hold-down cleat will engage the groove in the
vent pipe.
COMPLETE THE VENTING
Type B/W gas vent shall extend from the header plate of
the furnace to a point above the highest ceiling plate within
the stud space through which the vent passes, without any
offsets or crossovers. The first vent pipe offset, (if required),
may not be any closer than 2-feet from the header and
needs to extend past the ceiling plate. After a type B/W gas
vent passes through the highest ceiling plate within a stud
space above the furnace to which it serves, the vent system
may be completed with a Type B gas vent, from the SAME
manufacturer (do not mix brands of pipe). Offsets cannot
be greater than 45 degrees from vertical. Refer to The
Uniform Mechanical Code.
Install the oval-to-round adapter. Complete the piping
extending it through the roof. Use a 4-inch round, double-
wall (Type B) vent pipe, roof flashing, storm collar and vent
cap as shown. The vent cap must be at least 2-feet higher
than any point that is within 10- feet of the vent cap. There
must be at least a 1-inch clearance between the vent pipe
and any combustible material.
CAUTION: To avoid damage to wiring, be sure to route
the wires away from the path of the furnace vent.
Attaching Your Furnace
Clear the wall recess of all debris, remove any wood or plaster.
Stand the furnace in front of recess, holding the furnace body
at an angle. Insert flue collar into the opening in the header
plate and raise furnace carefully Figure 9A, 9B. Swing bottom
of furnace into wall recess with front edges of legs flush with
2x4 floor plate. In the holes provided, nail through the legs
into studs or floor plate. Figure 10
Do not damage gasket glued to underside of header plate
when placing furnace in wall. Avoid nailing the legs so tightly
that it disturbs the inner furnace casing. Do not try to force
the furnace into a smaller-than-specified recess.
TILT FURNACE &
INSERT FLUE INTO
RECTANGULAR OPENING IN
HEADER PLATE
RAISE FURNACE &
SWING BOTTOM OF
UNIT INTO WALL
OPENING
SECURE
SUPPORT LEGS
TO FLOOR PLATE
MONTEREY TOP VENT GAS WALL HEATER 17
FIGURE 11 – REMOVE KNOCKOUT PLATES
REAR OUTLET KIT INSTALLATION (OPTIONAL)
If a Rear Outlet Register Accessory is used, the following
procedure must be completed before placing furnace body
into wall recess. Figure 11 Attach speed nuts to outer shield
and remove knockout plates from both the outer and inner
shields as follows:
1. Punch in the lower corners with a screwdriver blade.
2. Break the knockout side and bottom connecting tabs
by holding a screwdriver blade sideways against the
tab and striking the head of the screwdriver lightly with
a hammer.
3. Swing the plate outward; bend it back and forth to
break the top tabs. Use caution when handling sharp
metal edges.
CAUTION: Do not install rear outlet kit where grille may
be blocked by a door, curtains, or any other obstruction.
WARNING: Never shear or cut the furnace legs.
INNER SHIELD
KNOCKOUT PLATE
ON OUTER SHIELD
HOLD SCREWDRIVER
SIDEWAYS AGAINST
TABS AND STRIKE
LIGHTLY WITH
HAMMER
10 - 24 SPEED NUT
Attaching Your Furnace continued
After furnace is in position, install rear outlet register as
shown in Figure 12. Have damper in open position when
inserting the assembly. Secure the rear outlet register to
speed nuts with the machine screws furnished.
FIGURE 12 – MOUNTING REAR OUTLET REGISTER
Gas Supply and Piping
The gas control valve, in the furnace, is shipped with a seal
over the gas inlet tapping. Do not remove the seal until ready
to connect the piping.
WARNING: Danger of property damage, bodily
injury or death. Make sure the furnace is equipped to
operate o the type of gas available. Models designed
as natural gas are to be used with natural gas only.
Models designed for use with liquefied petroleum
propane gas have orifices sized for commercially pure
propane gas. They cannot be used with butane or a
mixture of butane and propane.
GAS SUPPLY
For propane gas the minimum inlet gas supply pressure
for the purpose of input adjustment is 11-inches water
column. The maximum inlet gas supply pressure is
13-inches water column.
For natural gas, the minimum inlet gas supply pressure for
the purpose of input adjustment is 5-inches water column.
The maximum inlet as supply pressure is 7-inches water
column.
Gas pressure and input to the burners must not exceed
the rated input and pressure shown on the nameplate.
The natural gas manifold pressure should be 4-inches
water column. The manifold pressure should be 10-inches
water column for propane gas. For operation in elevations
above 2,000 feet, a burner orifice change may be required to
suit the gas supplied. Check with your local gas supplier.
FURNACE SHIELDS
REAR REGISTER
OUTLET
PLASTER GROUND
18
ORIFICE SIZES
The efficiency rating of this appliance is a product thermal
efficiency rating determined under continuous operating
conditions and was determined independently of any
installed system. For elevations above 2,000 feet, reduce
ratings 4% for each 1,000 feet above sea level.
FURNACE TECHNICAL INFORMATION
MODEL
NUMBER
GAS
TYPE
INPUT
RATING
BTU/hr.
HEATING
CAPACITY
RATING
BTU/hr.
MAIN BURNER ORIFICE
DRILL DECIMAL
QUANTITY
2509622A NATURAL 25,000 17,870 #43 0.089 1
2509621A PROPANE 25,000 17,870 .057" 1
3509622A NATURAL 35,000 23,700 #36 0.106 1
3509621A PROPANE 35,000 23,700 .069" 1
5009622A NATURAL 50,000 36,900 .091" 2
5009621A PROPANE 50,000 36,900 .058" 2
GAS CONVERSION KITS
NATURAL GAS TO PROPENE GAS
8913 25096A SERIES WITH WILLIAMS BRAND GAS VALVE
8914 35096A SERIES WITH WILLIAMS BRAND GAS VALVE
8909 50098 SERIES WITH WILLIAMS BRAND GAS VALVE
GAS CONVERSION KITS
PROPANE GAS TO NATURAL GAS
8915 25096A SERIES WITH WILLIAMS BRAND GAS VALVE
8916 35096A SERIES WITH WILLIAMS BRAND GAS VALVE
8912 50098 SERIES WITH WILLIAMS BRAND GAS VALVE
GAS PIPING
The gas supply line must be of adequate size to handle the
Btu/hr. requirements and length of the run for the unit being
installed.
Determine the minimum pipe size from Figure 13, based on
the length of the run from the gas meter to the unit.
All piping must comply with local codes and ordinances
or with the National Fuel Gas Code (ANSI Z223.1 NFPA No.
54), whichever applies. (In Canada: CAN/C.GA B149). Refer
to FIGURE 14 for the general layout of the unit. It shows the
basic fittings needed.
The following rules apply:
1. Use new, properly reamed steel or black iron pipe and
fittings free of metal chips and debris that are approved by
local codes. Metal chips and debris can damage the valve.
FIGURE 13 - PIPE CAPACITY
PIPE CAPACITY - BTU/hr. WITH FITTINGS
NATURAL GAS
LENGTH
OF PIPE
FEET
PIPE SIZE
1/2”
3/4” 1”
20
40
60
92,000
63,000
50,000
190,000
130,000
105,000
350,000
245,000
195,000
PROPANE
LENGTH
OF PIPE
FEET
PIPE SIZE
1/2”
3/4” 1”
20
40
60
189,000
129,000
103,000
393,000
267,000
217,000
732,000
504,000
409,000
INSTALLING YOUR FURNACE
2. Do not thread pipe too far. Valve distortion or malfunction
may result from excess pipe within the gas control valve.
Apply a moderate amount of good quality dope to the
pipe only. Leave the two end threads bare. Figure 15
3. Use ground joint unions.
4. Install a drip leg (sediment trap) to trap dirt and moisture
before it can enter the gas valve. The nipple must be a
minimum of 3-inches long.
5. Install a manual shutoff valve.
6. Provide a 1/8” NPT test gauge connection immediately
before the gas supply connection to the furnace.
GAS CONNECTION
If the installation is for propane gas, have the propane installer
use a two stage regulator and make all the connections from
the storage tank.
Use two pipe wrenches when making the connection to the
valve to prevent turning and/or damage to the valve.
Connections between the manual shutoff valve and burner
control assembly can be made with an A.G.A./C.G.A. design
certified flexible connector if allowed by local codes. Drip leg
and ground joint unions are still required.
Tighten all joints securely.
Test all piping for leaks. When checking gas piping to the
furnace with gas pressure less than 1/2 PSI, shut off manual
gas valve to the furnace. If gas piping is to be checked with
the pressure at or above 1/2 PSI, the furnace and manual
shutoff valve must be disconnected during testing. (SEE
WARNING). Apply soap solution (or a liquid detergent) to
each joint. Bubbles forming indicate a leak. Correct even the
slightest leak at once.
MONTEREY TOP VENT GAS WALL HEATER 19
FIGURE 14 – GAS PIPING
MANUAL SHUT-OFF VALVE
1/8ʺ NPT
PLUGGED
HOLE FOR
TEST
GAUGE
DROP
GROUND JOINT UNION
GAS
VALVE
GAS
VALVE
GAS
VALVE
PIPED GAS SUPPLY
PIPED GAS SUPPLY
TUBING GAS SUPPLY
CAUTION: Shut off the main gas supply before removing the end cap to prevent
gas from filling the work area. Test for gas leakage when installation is complete.
2
CAUTION: All bends in metal tubing must be smooth.
1
2
CAP
2
CAP
2
CAP
1
HORIZONTAL
3ʺ (76.2 MM) MINIMUM
3ʺ (76.2 MM)
MINIMUM
3ʺ (76.2 MM) MINIMUM
MANUAL SHUT-OFF VALVE
MANUAL
SHUT-OFF VALVE
NIPPLE
TEE
FITTING
NIPPLE
TEE
FITTING
NIPPLE
RISER
RISER
DROP
HORIZONTAL
GROUND JOINT
UNION
GROUND JOINT UNION
FIGURE 15 – PROPER PIPING PRACTICE
PROPER PIPE
THREADING
INCORRECT
THREADING
2 THREADS EXPOSED
SEALANT THIN
ENOUGH TO SHOW
THREADS
OVER-THREADED
SEALANT
TOO THICK
SEALANT
PAST TIP
DAMAGED
THREADS
WARNING: Danger of property damage, bodily
injury or death. Never use a match or open flame
to test for leaks. Never exceed specified pressures
for testing. Higher pressures may damage the gas
valve and cause over-firing which may result in
component(s) failure. Never attempt start-up of unit
before thoroughly ventilating the area and smelling
near the floor for gas odor.
Front Panel Installation
Place the front panel top over the channel on the header
plate, as shown in Figure 16. Press the panel tight against
wall, and secure it to the header channel with the screw
provided in final assembly package. Open the control
door at bottom of panel and fasten the panel at each side
through slots in flanges with screws provided.
Attach handle to the front panel door with the screw
provided.
Install the second face panel in same manner for 500
Series models.
FIGURE 16 – PANEL PLACEMENT
20
Thermostat Installation
(Sold Separately)
Use Williams thermostat P322016 or any millivolt
thermostat. Current to the thermostat is supplied by the
pilot generator. Do not connect it to electricity. Anticipator
settings are not required.
1. Use of existing wire is acceptable if it is in a satisfactory
location and the wire is in good condition. When in doubt,
use new wiring.
2. If a new location is chosen or if this is a new installation,
thermostat wire must first be run to the location selected.
All wiring must agree with local codes and ordinances.
These instructions cover bringing the wire down from the
attic but it may be run from a basement or crawl space
using similar methods.
3. Before drilling a hole in the wall at the selected location,
drive a small finish nail through the ceiling in the corner of
the wall and ceiling above the thermostat location. Pull
the nail out and push a small, stiff wire through the hole
so it can be found in the attic. Drill a ½&inch hole through
the ceiling wall plate.
4. Probe for obstructions in the partition. Then, drill a ½-inch
hole through the wall at the selected location for
the thermostat.
5. From the attic, feed the thermostat wire through the wall
until even with the thermostat location.
6. Snag the thermostat wire through the hole and pull the
wire through the hole in the wall so that 6&inches of the
wire protrude.
7. Route wires to the furnace.
8. Never use nails or staples across the thermostat wires.
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing. Refer to installation instructions packed in
the thermostat carton if you have any doubt about the
above procedures.
WALL-MOUNTED THERMOSTAT INSTALLATION
1. To remove the thermostat cover, squeeze both sides
and lift.
2. Connect the thermostat wires to the terminal screws on
the base of thermostat.
3. Push any excess wire back through hole in the wall and
plug hole with insulation to prevent drafts
from affecting thermostat operation.
4. Be sure to level the thermostat for best appearance.
Fasten thermostat base to the wall through mounting
holes with screws provided.
5. Replace the thermostat cover.
6. Do not run wire in any location where it might be
damaged. Avoid splicing the thermostat wires unless the
spliced wires are properly cleaned, soldered and taped.
FIGURE 17 – THERMOSTAT WIRING
INSTALLING YOUR FURNACE
7. Use the 18-gauge wire as supplied for a maximum
length of 20-feet. If a longer length is needed, use
16-gauge wire to a maximum length of 25-feet.
8. Connect the thermostat wires to the control valve as
shown in Figure 17.
FACE PANEL-MOUNTED THERMOSTAT INSTALLATION
1. Before removing the face panel, disconnect the
thermostat wires at the gas valve.
2. Locate the knockout on the right side of the furnace
to mount the thermostat. Remove the knockout by
tapping it lightly with a screwdriver Figure 18 It will
also be necessary to cut a 1/2 inch hole in the inside
panel insulation for clearance to the knockout.
3. Cut the thermostat wire to 56 inches.
4. Connect the thermostat wires to terminal screws on
the thermostat base.
5. Feed the thermostat wires through the knockout and
route them through the metal clip to the gas valve.
6. Mount the thermostat to the side of the cabinet with
screws provided.
7. Replace the thermostat cover.
8. Connect the thermostat wires to the control valve as
shown in Figure 17.
IMPORTANT: Keep the thermostat wires away from the
combustion chamber.
FIGURE 18 – THERMOSTAT MOUNTING PANEL
MONTEREY TOP VENT GAS WALL HEATER 21
Start-Up Procedure
WARNING: Danger of property damage, bodily
injury or loss of life. propane gas is heavier than air and
may settle in any low area, including open depressions
and may remain there unless area is ventilated. Never
attempt start&up of unit before thoroughly ventilating
the area.
Check the furnace operation as outlined in the following
instructions. If any sparking, odors or unusual noises
are encountered, shut off electric power immediately.
Recheck for wiring errors or obstructions in or near fan
motor (if equipped).
WARNING: Natural gas heating value (BTU per
cubic foot) can vary significantly. Therefore, it is the
installer’s responsibility to see that BTU/hr. input to
the furnace is adjusted properly. Failure to do so could
cause combustion chamber failure, asphyxiation, fire or
explosion resulting in damage, bodily injury or death.
Refer to the National Fuel Gas Code (NFPA 54) to be
sure the furnace is burning fuel at the proper rate.
CHECK GAS INPUT AND PRESSURES
For furnaces located at elevations between sea level and
2,000 feet, the measured input must not be greater than
the input shown on the nameplate of the furnace. For
elevations above 2,000 feet, the measured input must not
exceed the input on the nameplate reduced by 4 percent
for each 1,000 feet that the furnace is above sea level.
Gas supply pressure and manifold pressure with the
burner(s) operating must also be as specified on the
nameplate.
Rated input will be obtained on a heating value of 2,500
BTU/hr. for propane at 10-inches manifold pressure with
factory-sized orifices. If propane gas having a different
heating value is supplied, orifices must be changed by a
qualified service technician before the furnace is operated.
CHECK THE MANIFOLD GAS PRESSURE
A tapped opening is provided in the gas valve to facilitate
measuring manifold gas pressure. A water column
manometer having a scale range from 0 to 12-inches of
water column should be used for this measurement. The
manifold pressure must be measured with the burner and
pilot operating. Any major changes in the flow must be
made by changing the size of the burner orifice.
CHECK THE GAS INPUT (NATURAL GAS ONLY)
Under firing could cause inadequate heat, excessive
condensation or ignition problems. Over firing could
cause shooting flame impingement or overheating of the
combustion chamber. Before starting natural gas input
check, obtain the heating value of gas (BTU per cubic foot)
at standard conditions from your local gas supplier.
To measure the input, using the gas meter, proceed
as follows:
1. Turn off gas supply to all other appliances except
the furnace.
2. With the furnace operating, time the smallest dial on the
meter for one complete revolution. If this is a 2-cubic-
foot dial, divide the seconds by 2. If it is a 1-cubic-foot
dial, use the time in seconds as is. This gives the seconds
per cubic foot of gas being delivered to the furnace.
3. Assuming natural gas with a heating value of 1,000 BTU
per cubic foot and 34-seconds per cubic foot used as
determined by step (2), then:
Seconds per hour = 3,600
Input = 1,000 x 3,600 / 34 = 106,000 BTU/hr.
This measured input must not be greater than the
input indicated on the nameplate of the furnace.
4. Relight all other appliances turned off in Step 1 above. Be
sure all pilots are operating.
CHECK THERMOSTAT
Check thermostat operation. When set above room
temperature shown on the thermostat, the main burner
should light. Make certain the thermostat turns off the
furnace when the room temperature reaches the selected
setting and starts the furnace when room temperature falls a
few degrees below the thermostat setting.
TYPE OF GAS MANIFOLD PRESSURE, IN. W.C.
NATURAL 4.0
PROPANE 10.0
CHECK GAS CONTROL VALVE WIRE CONNECTIONS / GAS CONTROL VALVE WIRIG - P323011 OR P322660
22
OPERATING YOUR FURNACE
Start-Up Procedure (continued)
CHECK PILOT BURNER
The pilot flame hits the generator’s curved surface and splits.
Pilot flame is preset at the factory, so ordinarily it does not
require field adjustment. Figure 19. On new installations, the
gas lines will be filled with air and may take several minutes
to establish a pilot flame.
BURNER FLAME CHARACTERISTICS
Start the furnace and let it operate at least ten minutes.
Open the access door to view the burner flame. Limit your
movements near the furnace a few more minutes before
making your final observations. The flame may look yellow
due to dust particles in the room air. The flame should
change to a nice blue color with firm inner and secondary
cones. An occasional flash of orange might be seen as
dust particles burn in the flame. This is normal. No burner
adjustment is provided, or is necessary. (Figure 20).
NORMAL APPEARANCE
NATURAL GAS:
1. Inner cone-blue in color-3/8 to 5/8-inches above ports.
2. Secondary inner cone-light blue in color-1 to 2-inches
above ports.
3. Total flame-from blue in color to nearly invisible -
approximately 6-inches above ports.
FIGURE 19 CHECK PILOT BURNER
PROPANE GAS:
1. Inner cone-blue in color-1/2 to 3/4-inches above ports.
2. Secondary inner cone-light blue in color-1 to 2-inches
above ports.
3. Total flame-from blue in color to nearly invisible-
approximately 6-inches above ports.
ABNORMAL APPEARANCELAZY FLAME:
Long, soft yellow cones moving around in the combustion
chamber lifting from ports (insufficient air).
EXTREMELY FAST FLAME:
Flame will not hold to ports-entire cone sections blow off
from noisy ports (too much pressure).
WARNING: If flame appears abnormal, contact
the gas company or a qualified service technician
immediately.
WARNING: Read owner’s manual before using /
installing. Be sure CHANGED LIGHTING INSTRUCTION
TAG hangs at the lowest position in the furnace under /
below the heat shield.
For your safety, read before
lighting the pilot
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
LIGHTING THE PILOT
A. This appliance has a pilot which may be lit by hand.
When lighting the pilot, follow these instructions exactly.
B. BEFORE LIGHTING smell around the appliance area for
gas. Be sure to smell next to the floor because some
gases are heavier than air and will settle on the floor.
C. Use only your hand to push in or turn the gas control
knob. Never use tools. If the knob will not push in
or turn by hand, don’t try to repair it, call a qualified
service technician. Force or attempts to repair may
result in a fire or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
FIGURE 20 - BURNER FLAME CHARACTERISTICS
TOP VIEW (WITHOUT PILOT COVER)
FRONT VIEW (WITHOUT PILOT COVER)
PILOT
THERMOPILE/GENERATOR
IGNITER ELECTRODE
MONTEREY TOP VENT GAS WALL HEATER 23
5. Push in gas control knob slightly and turn
clockwise to “OFF”. Figure 21
6. Wait five (5) minutes to clear out any gas, then smell for
gas, including near the floor. If you then smell gas,
STOP! Follow “E” in the safety information above. If you
don’t smell gas, go to the next step.
7. Loosen wing nut and open the pilot observation door
(if equipped).
8. To find the pilot, follow metal tube from the gas control.
The pilot is mounted on the side of the burner. Figure 22
9. Turn knob on the gas control
counterclockwise “PILOT”.
10. Push in the control knob all the way and hold in.
Immediately light the pilot. Continue to hold the control
knob in for about one (1) minute after the pilot is lit.
Release the knob and the pilot flame will pop back up.
The pilot should remain lit. If it goes out, repeat Steps
5 through 10.
• If knob does not pop up when released, stop and
immediately call your service technician or gas supplier.
• If the pilot will not stay lit after several tries, turn the gas
control knob “OFF” and call your service technician or
gas supplier.
11. Close pilot observation door, tighten wing nut (if equipped).
12. Turn gas control knob counterclockwise
to the ON position
13. Close control access panel.
14. Turn on all electric power to the appliance (if applicable).
15. Set thermostat to desired setting.
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot.
follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell
next to the floor because some gas is
heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance or strike a
match.
Do not touch any electric switch; do not use
any phone in your building.
Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
OPERATING INSTRUCTIONS
If you cannot reach your as supplier, call
the fire department.
C. Use only your hand to push in or turn the
gas control knob. Never use tools. If the
knob will not push in or turn by hand, don’t
try to repair it, call a qualified service
technician. Force or attempted repair may
result in a fire or explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualified service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.
1. STOP! Read the safety information above.
2. Turn off all electric power to the appliance
(if applicable).
3. Set the thermostat to lowest setting.
4. Open control access panel.
5. Push in gas control knob slightly and turn
clockwise to OFF.
NOTE: Knob cannot be turned from PILOT to OFF
unless knob is pushed in slightly. Do not force.
6. Wait (5) minutes to clear out any gas. Then
smell for gas, including near the floor. If you
then smell gas, STOP! Follow “B” in the safety
information above. If you don’t smell gas, go
to the next step.
7.
Loosen wingnut and open the pilot observation
door (if equipped).
8.
Find pilot-follow metal tube from gas control.
The pilot is mounted on the
side of burner.
9. Push in gas control knob slightly
and turn counterclockwise
to PILOT.
10. Push in control knob all the way and hold in.
Immediately light the pilot. Continue to hold
the control knob in for about (1) minute after
the pilot is lit. Release knob and it will pop
back up. Pilot should remain lit. If it goes
out, repeat steps 5 thru 10.
If knob does not pop up when released, stop
and immediately call our service technician
or gas supplier.
If pilot will not stay lit after several tries, turn
the gas control knob to OFF and call your
service technician or gas supplier.
11.
Close pilot observation door, tighten wingnut
(if equipped).
12. Turn gas control knob counterclockwise
to ON.
13. Close control access panel.
14. Turn on all electric power to the appliance
(if applicable).
15. Set thermostat to desired setting.
TO TURN OFF GAS TO APPLIANCE
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance
if service is to be performed (if applicable).
3. Open the control access panel.
4. Push in gas control knob slightly and turn
clockwise to OFF. Do not force.
5. Close the control access panel
LIGHTING PILOT: (If furnace is equipped with a
manual spark igniter follow next steps).
1. Review all operating instructions above.
2. When lighting pilot, depress red button
located on the lower right side of the burner
compartment (view pilot through glass
observation door, repeat several times if
necessary).
3. If pilot fails to light or spark is not present
while actuating, follow steps 5 thru 10 above.
P323203 RV1-20
Read owner’s manual before using/installing. Be sure CHAINED LIGHTING INSTRUCTION TAG
hangs at the lowest position in the furnace under/below the heat shield.
250 West Laurel Street · Colton, CA 92324
E. WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance or strike a match.
• Do not touch any electrical switch; do not use any
phone or cell phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the fire
department.
IMPORTANT: KEEP BURNER AND CONTROL
COMPARTMENT CLEAN. Make sure the “FOR YOUR
SAFETY” hang tag (see below) hangs below the heat shield.
Operating Instructions
1. STOP! Read the safety information above.
2. Set the thermostat to lowest setting.
3. If applicable, turn off all electric power to the appliance.
4. Open control access panel.
FIGURE 21 - GAS CONTROL KNOB
FIGURE 22 - PILOT AND GENERATOR
PILOT
PILOT TUBE
THERMOPILE/GENERATOR
IGNITER ELECTRODE
24
OPERATING YOUR FURNACE
For your safety, read before
lighting the pilot
(continued)
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be
performed (if applicable).
3. Remove control access panel.
4. Push in gas control knob slightly and
turn clockwise to “OFF”. Do not Force.
5. Replace control access panel.
IMPORTANT:
KEEP BURNER AND CONTROL COMPARTMENT CLEAN.
WARNING: Due to high surface temperatures, keep
children, clothing, furniture or any combustible material
away from the furnace.
THE FURNACE OPERATES IN THE FOLLOWING
SEQUENCE:
1. Thermostat turns on the main burner.
2. Heat builds up in the furnace and starts the fan (if
equipped). The heated air comes out the front
panel louvers.
3. When the thermostat setting is reached, it shuts off the
main burner.
4. The fan runs until the heat is removed from the furnace,
then it turns off (if equipped).
Your furnace is equipped with a 100% safety pilot that will
shut off the gas supply in case the pilot is not burning
or functioning properly. Make sure the pilot is adjusted
properly and that the pilot generator connection at the
control valve is tight. If the furnace will not stay lit, call your
local gas utility or a qualified service person.
If furnace is equipped with a manual spark igniter, follow
these steps:
1. Review the pilot lighting instructions.
2. When instructed to “Light the Pilot,” depress the red
button located on the burner pan for pilot ignition. If
necessary, depress the red button vigorously several
times for pilot ignition.
3. If pilot fails to ignite or a spark is not present while
actuating the red button or by using a match, repeat
steps 5 through 10 listed in “Lighting the Pilot.”
WARNING: The surface of the furnace is hot
during operation. Keep children, clothing, furniture,
and flammable material away from it. Keep all access
doors and panels in place except for inspection and
maintenance. On new installations, the gas lines will
be filled with air and it may take several minutes to
establish the pilot flame.
WARNING: Danger of property damage,
bodily injury or death. If the furnace overheats or fails
to shut off, close manual shutoff gas valve to the
furnace before turning off electrical power to the
accessory fan.
WARNING: Protect your eyes against the danger
of ignition flash and eye injury or blindness. Never
attempt to light the pilot with the gas control valve
knob in the “ON” position. Flashback could occur.
How to Care for Your Furnace
WARNING: Danger of bodily injury or death. Turn
off electric power supply at disconnect switch, fuse box
or service panel before removing any doors or access
service panels from unit.
ANNUAL UPKEEP NEEDED
It is recommended that a qualified service technician
perform these maintenance checks at the beginning of
each heating season.
CABINET FINISH
Clean cabinet with damp cloth. Never use abrasive
cleaners. Cabinets are finished with heat resistant powder
paint. Never refinish or paint.
FURNACE AREA
Keep the area near the furnace clear and free from
combustible materials, gasoline and other flammable
liquids and vapors.
COMBUSTION AND VENTILATION AIR
The combustion and ventilation air supply must not be
blocked. Do not put anything in or on the furnace cabinet.
For better circulation and more effective heating, do not
place obstructions, furniture or other items closer than
four&feet in front of the furnace or two&feet from each
side of the furnace.
MONTEREY TOP VENT GAS WALL HEATER 25
CARING FOR YOUR FURNACE
CLEANING BLOWER (IF APPLICABLE)
Shut off electricity. Clean any lint or dirt from fan blades,
fan motor and exposed air passages.
PILOT BURNER
Using the instructions in “Lighting the Pilot”, leave
thermostat at its lowest setting.Pilot flame should surround
the generator tip 1/4 to 3/8-inches. If flame needs
adjusting, do so as follows:
1. Insert small screwdriver into the pilot adjusting
screw Figure 23. Adjust flame as needed. Turn screw
counterclockwise to increase flame, clockwise
to decrease.
2. Turn thermostat to highest setting. Main burner should
light quickly and smoothly. Turn thermostat to lowest
setting. Main burner should go out. Pilot should
remain lit.
VENT SYSTEM
Make sure that no parts of the venting system are blocked
or rusted. Clean or replace before using the furnace.
BURNER CLEANING
If cleaning is required, contact a qualified service technician
to clean and service burner. To remove burner(s):
1. Open burner compartment door.
2. Shut off gas supply to furnace.
3. Disconnect gas line inside cabinet at ground joint union
fitting. Figure 24
4. Remove (2) screws securing burner pan assembly to
inner liner.
5. Pull burner pan assembly forward approximately
1/2-inch and drop down to expose the top of the burner.
6. Clean all foreign materials from the top of the burner.
7. After cleaning, replace burner pan assembly by
reversing above procedure.
FIGURE 23 - ADJUSTING THE PILOT
FIGURE 24 - DISCONNECTING GAS LINE
CLEANING THE BURNER COMPARTMENT
Because cold air is attracted to the flame during furnace
operation, a buildup of lint from carpeting, bedding, dust,
etc. in the burner area will occur. It is necessary to clean
this area regularly. Use a vacuum cleaner with a narrow
attachment to reach small areas. Be careful in and around
the pilot. A change in its adjustment could be made if
moved during cleaning. A properly adjusted burner with
nearly all gases will produce a flame which has clear blue
cone having a bluish-red or bluish-violet outer mantle.
DANGER: The build-up of any dust, lint or foreign
material in the primary air opening of the burner can
interfere with the proper air gas mixture and can result
in a yellow flame which can produce carbon monoxide
and soot. This condition, if allo wed to develop, can lead
to bodily injury incl uding death. It is imperative that
the burner be kept clean.
PILOT COVER
26
BLOWER ACCESSORY 2901 AND 2907
This blower accessory is installed on the furnace top and
increases circulation of warm air through the heated space.
A 115V electrical outlet adjacent to the furnace is required.
For automatic setting, you must select the “HI” or “LOW” fan
switch position. When the furnace heats up, the automatic
fan switch will be activated and the fan will operate. The
blower accessory will not operate if the fan switch is set in the
“OFF” (center) position. Be sure this accessory is of the type
and design required for use with your furnace.
1. Turn off electric power supply at the disconnect switch,
fuse box or service panel before installation or service to
the blower accessory.
2. Label all wires prior to disconnection when servicing.
Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
3. Install a 115V electrical outlet as shown in Figure A.
4. Remove the two (2) screws securing the blower grille and
remove the blower grille as shown in Figure B.
5. Remove the two (2) screws securing the junction box
cover. Remove the cover to gain access to the knockout
located in the junction box.
6. Locate the knockout and remove it using a hammer and
screwdriver. Use caution when handling sharp metal edges.
7. Place the blower body on furnace top as shown in Figure B.
8. Route 115V wiring into the junction box through the
knockout.
9. Make wiring connections inside the junction box as shown
in Figures C and D. Follow applicable local and national
electrical codes. All electrical work must conform to your
local codes and ordinances or in their absence, with
National Electrical Code, NFPA 70/ANSI. If you are not
familiar with wiring codes in general, have a competent
electrician do this job.
Drill a 1/8-inch diameter hole in each side of the furnace
face panel through the holes located on the sides of the
fan cabinet. Secure the blower to the furnace with the
two screws provided.
10. Replace the junction box cover, securing it with the screws
previously removed
11. Replace the blower grille, securing it with the screws
previously removed.
12. Set the switch to the desired position. If left in “HI” or
“LOW” position during the summer months, the blower
could be activated by heat. If this is undesirable,
set the switch to the “OFF” position.
CAUTION: Danger of property damage, bodily injury or
death. Turn off electric power supply at the disconnect
switch, fuse box or service panel before removing or
working on the fan cabinet.
INSTALLING YOUR
BLOWER ACCESSORY
FIGURE A - INSTALL ELECTRICAL OUTLET
FIGURE B - INSTALL BLOWER BODY
MONTEREY TOP VENT GAS WALL HEATER 27
FIGURE C - WIRING FOR MODEL 2901
FIGURE D - WIRING FOR MODEL 2907
28
INSTALLING YOUR MOTORIZED
REAR OUTLET ACCESSORY
MOTORIZED REAR OUTLET REGISTER 6919 AND 6920
WARNING: Danger of property damage, bodily
injury or death. Turn off all electrical power supply at
disconnect switch, fuse box or service panel before
removing or working on fan. For your protection
against shock hazard, this appliance is equipped
with a three-prong (grounding) plug and should be
plugged directly into a properly grounded three-
prong receptacle. Do not cut or remove the prong. All
electrical work must conform to your local codes and
ordinances or in their absence, with National Electrical
Code ANSI/NFPA 70. In Canada, use the Canadian
Electrical Code C22.1. If you are not familiar with the
wiring codes in general, have a competent electrician
do this job.
MOTORIZED REAR OUTLET REGISTER 6919 AND 6920
This Rear Outlet Register directs some of the heated air
into the room opposite the one in which the furnace is
installed. Read these instructions carefully and familiarize
yourself with the installation before you begin. Use gloves
to protect your hands from sharp metal edges.
BLOWER SETTINGS
You must select “ON” for continuous blower operation or
“AUTO” for automatic setting. If the blower is set on “AUTO”
when the furnace heats up, the heat sensor switch is
activated and the blower will operate until the furnace cools
down, then the blower will turn off. The blower will not
operate if fan switch is set in the “OFF” (center) position.
LOCATION WARNING
This register must be centered between studs and aligned
with the furnace for proper engagement. Make sure the
furnace is centered between the same studs before you
cut any wall openings for the register.
1. Measure and mark wall for opening as shown in
Figure A. Check the wall for any electrical wiring
present before cutting the opening. Reroute existing
electrical if necessary.
2. If recessed-mounted installation, place the plaster
ground in the opening and attach to the 2 x 4 studs.
3. An embossed knockout plate is located on the rear
of the outer shield and another is located directly
behind it on the inner shield Figure B. Remove the
knockout plates on the furnace by punching in the
lower corners of the plate with a screwdriver blade.
Then, holding the screwdriver blade sideways against
the side and bottom connecting tabs, strike the head
of the screwdriver lightly with a hammer to break the
tabs. Swing the plate outward and bend it back and
forth to break the top tabs. Both knockout plates must
be removed in order to attach the register assembly
properly. If the inner shield knockout is not embossed
deep enough to be removed easily, mark an outline
using the existing opening as a guide. Use tin snips to
cut the area away. A pilot hole may be needed to begin
the first cut. Take care not to damage the combustion
chamber directly behind the inner shield when making
a pilot hole.
4. Attach speed nuts to the outer shield, Figure B. After
the furnace is in position, insert the outlet register
into the opening as shown in Figures C, D and E. Install
machine screws through the register housing and into
the speed nut clips on the furnace outer shield. Do not
over tighten the screws.
5. After the register has been either wired, Figure F,
or plugged in, set the fan switch to the desired
blower operation.
CAUTION: Do not install this kit where the outlet grille
may be blocked or covered by a door, curtains or any
other obstructions.
FIGURE A - RECESSED & SURFACE INSTALLATION
FIGURE B - REMOVING KNOCKOUT PLATES
MONTEREY TOP VENT GAS WALL HEATER 29
FIGURE C - SURFACED MOUNTED INSTALLATION FIGURE D - SURFACED MOUNTED INSTALLATION
FIGURE E - SURFACE MOUNTED INSTALLATION FIGURE F - WIRING
30
REF.
NO.
REPLACEMENT PART DESCRIPTION
2509622A
2509621A
3509622A
3509621A
1
Face Panel 4915 4915
2
Front Heat Shield 9C216 9C216
3
Combustion Chamber 6922 6923
4
Front Shield Deflector 9B199 9B199
5
Inner Shield Top 9C152 9C152
6
Draft Hood Assembly 9C184 9C217
7
Vent Limit Switch P321826 P322055
8
Shield Assembly 9C213 9C213
9
Header 5902 5902
10
Burner Pan 9B296 9B296
11
Manual Spark Igniter P285500 P285500
12
Igniter Bracket 7A189 7A189
13
Pal Nut P285501 P285501
14
Header - Insulation P324046 P324046
NOT
SHOWN
Parts Bag 9A324 9A324
NOT
SHOWN
Knob P332606 P332606
NOT
SHOWN
Vent Limit Switch Bracket P322074 P322074
SINGLE SIDED 1 IN. SIDE CLEARANCE
NATURAL
2509622A 3509622A
PROPANE
2509621A 3509621A
PART NUMBERS FOR THE 250 / 350 MODELS
MONTEREY TOP VENT GAS WALL HEATER 31
EXPLODED VIEW & REPLACEMENT PARTS CHART
1
2
3
4
5
6
7
8
9
10
11
12
13
32
REF.
NO.
REPLACEMENT PART DESCRIPTION
2509622A 3509622A 2509621A 3509621A
1
Wire Assembly (Both Required)
P321836/A P321836/A
P321836/A
P321836/A
2
Valve
P323011 P323011
P322660
P322660
3
Front Burner Bracket
9B234 9B234
9B234
9B234
4
Manifold
P323660 P323660
P323660
P323660
5
Burner Orifice (2 Required for 500 Series)
P090543 P090536
P332624
P332635
6
Pilot Kt (Pilot, Thermopile, Electrode, Pilot Cover)
M118823 M118823
M118824
M118824
7
Burner (2 Required for 500 Series)
P323648 P323648
P323648
P323648
8
Pilot Tube
P012004 P012004
P012004
P012004
CONTROL ASSEMBLY REPLACEMENT PARTS
250 / 350 MODELS
SINGLE SIDED 1 IN. SIDE CLEARANCE
NATURAL
2509622A 3509622A
PROPANE
2509621A 3509621A
MONTEREY TOP VENT GAS WALL HEATER 33
EXPLODED VIEW & REPLACEMENT PARTS CHART
34
REF.
NO.
REPLACEMENT PART DESCRIPTION 5009622A 5009621A
1
Face Panel (2 Required) 4915 4915
2
Front Heat Shield (2 Required) 9C216 9C216
3
Carryover Shell 9A321-1 9A321-1
4
Combustion Chamber (2 Required) 9D97/9D98 9D97/9D98
5
Shield Assembly 9C218 9C218
6
Deflector (2 Required) 9B199 9B199
7
Header 5901 5901
8
Vent Limit Switch P321826 P321826
9
Draft Hood (2 Required) 9C170 9C170
10
Non-Vision Shield 9C157 9C157
11
Inner Shield Top (2 Required) 9C158 9C158
12
Burner Pan Assembly 9B251 9B251
13
Blower Heat Deflector 9A440 9A440
14
Manual Spark Igniter P285500 P285500
15
Igniter Bracket 7A189 7A189
16
Pal Nut P285501 P285501
NOT
SHOWN
Header – Insulation P310000 P310000
NOT
SHOWN
Parts Bag 9A323 9A323
NOT
SHOWN
Knob P332606 P332606
NOT
SHOWN
Vent Limit Switch Bracket P322074 P322074
Thermostat not included with these models.
DOUBLE SIDED SIDED 1 IN. SIDE CLEARANCE
NATURAL
5009622A
PROPANE
5009621A
PART NUMBERS FOR THE 500 MODELS
MONTEREY TOP VENT GAS WALL HEATER 35
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
6
EXPLODED VIEW & REPLACEMENT PARTS CHART
36
REF.
NO.
REPLACEMENT PART DESCRIPTION 5009622A 5009621A
1
Wire Assembly (Both Required)
P321836/A P321836/A
2
Valve
P323011 P322660
3
Front Burner Bracket
9B243 9B243
4
Manifold
P323661 P323661
5
Burner Orifice (2 Required for 500 Series)
P332625 P332623
6
Pilot/Generator Assembly
P322396 P322397
7
Burner (2 Required for 500 Series)
P323648 P323648
8
Electrode
P322155 P322155
9
Pilot Mounting Plate
9A409 9A409
1
2
3
4
5
6
7
8
9
CONTROL ASSEMBLY REPLACEMENT PARTS
500 MODELS
DOUBLE SIDED SIDED 1 IN. SIDE CLEARANCE
NATURAL
5009622A
PROPANE
5009621A
MONTEREY TOP VENT GAS WALL HEATER 37
REF.
NO.
REPLACEMENT PART DESCRIPTION PART NUMBER
1
Screw - #8Ax 3/8 (9) P013200
2
Blower Grille 9C99
3
Screw - #8Ax 3/8 (8) P093200
4
Screw - #10 x ½ P141000
5
Rocker Switch P320911A
6
Wire Bridle P320912
7
Flat Washer - #10-31 (2) P127300
8
Machine Nut - #8-32 w/Washer (2) P041100
9
Blower Body 9C102
10
Motor Mount Grommet (2) P321078
11
Strain Relief Bushing P012900
12
Temperature Limit Switch P323097
13
Screw - #8-18 x 1/2” P138200
14
Motor P323922
15
Fan Blade 9B99
16
Orifice Plate 9D12-1
17
Junction Box Cover 9B161
MODEL NUMBER
2901
1
1
2
3
3
1
1
1
1
1
1
9
8
4
15
16
14
12
13
10
11
5
17
7
7
6
BLOWER ACCESSORY MODEL 2901 PARTS
38
REF.
NO.
REPLACEMENT PART DESCRIPTION PART NUMBER
1
Blower Grille 9C99
2
Orifice Plate 9B246
3
Wire Assemblies P323085 / P323086 / P323377
4
Blower and Motor P323423
5
Heat Sensor Wire Assemblies P274202 / P109600
6
Junction Box Cover 9A483
7
Rocker Switch P323080
8
Blower Body 9B249
9
Temperature Limit Switch P323097
MODEL NUMBER
2907
Use only manufacturer’s authorized parts.
NOTE: Nuts, bolts, screws, and washers are standard hardware items and may be purchased locally.
1
2
3
4
5
6
7
8
9
BLOWER ACCESSORY MODEL 2907 PARTS
MONTEREY TOP VENT GAS WALL HEATER 39
REF.
NO.
REPLACEMENT PART DESCRIPTION 6919 6920
1
Register Assembly 9B269 9B285
2
Strain Relief Bushing P500158 P500158
3
J-Box Cover 9A427 9A427
4
Strain Relief Bushing P603108 P603108
5
Heat Sensor Switch P323172 P323172
6
Fan Switch P323080 P323080
7
Motor and Blower P323423 P323423
8
Motor cover 9A435 9A462
9
Motor Housing Back Plate 9B266 9B284
10
Cord and Plug P323081 P323081
11
Bushing P323084 P323084
MODEL NUMBERS
6919 6920
Use only manufacturer’s authorized parts.
NOTE: Nuts, bolts, screws, and washers are standard hardware items and may be purchased locally.
1
2
3
4
5
6
7
8
9
10
11
MOTORIZED REAR OUTLET REPLACEMENT PARTS
40
TROUBLESHOOTING YOUR FURNACE
ISSUE
1. Pilot will not stay lit after
following lighting instructions.
2. No gas to the main burner
3. Furnace operates but turns off
before room temperature is
attained.
4. Furnace not producing
sufficient heat..
5. Furnace operates but
will not shut off when room
temperature is attained.
6. Pilot outage.
POSSIBLE CAUSE(S)
a. Generator producing
insufficient millivolts.
b. Loose or dirty generator
connections at gas valve.
c. Generator defective.
d. Grounded thermostat wire.
e. Defective gas valve.
a. Gas valve not turned to the “ON”
position after lighting pilot.
b. Thermostat not tuned to a
position calling for heat.
c. Plugged furnace orifice.
d. Improper wired or
broken thermostat wires.
Defective thermostat.
e. Pilot generator may not be
generating sufficient millivolts
to open valve.
f. Defective valve.
g. Vent safety switch tripped.
a. Thermostat location.
b. Defective thermostat.
a. Furnace may be too small for
space being heated.
b. Furnace not burning at full rate.
a. Thermostat wiring defective.
b. Thermostat location.
c. Defective thermostat.
d. Valve stuck open.
a. Pilot flame may be low or
blowing (high).
b. Drafts or drafty areas.
CORRECTIVE ACTION
a. Check pilot flame. It must impinge on the generator.
b. Clean and/or tighten generator connections at valve.
c. Check generator with millivolt meter. Take reading
at generator terminals of the valve with the valve
placed in “Pilot” position. Disconnect the thermostat
wires. The millivolt reading should be 450 millivolts
or more.
d. Remove thermostat wires from valve terminals. If
pilot now stays lit, trace thermostat wiring circuit for
a ground. May be grounded to furnace, gas supply,
nails or staples.
e. Replace gas valve after above is verified.
a. Turn gas valve knob to the “ON.”
b. Set thermostat to a position calling for heat.
c. Check-clean or replace.
d. Check connections at valve terminals. If valve operates,
check thermostat wires.
e. See 1a and 1c above.
f. Replace gas valve after above is verified.
g. Check and reset.
a. Check thermostat location. It should not be in the path
of warm air discharge from furnace, near a lamp or
above a T.V. or stereo unit.
b. Check thermostat calibration or replace.
a. Check heat sizing calculations.
b. Check for low gas pressure at gas valve. It should be 4
inches water column for natural gas; 10-inches water
column for propane gas. Check for blocked burner orifices.
a. Thermostat lead wires may be shorted together,
caused by a nail or staple. Check by removing
thermostat leads from valve terminals.
b. Check thermostat location. If on an outside wall, or
there is a hole in the wall behind the thermostat,
cold air may be coming in contact with the thermostat.
c. Check thermostat calibration; verify thermostat
temperature reading; or replace.
d. Replace valve.
a. Adjust pilot flame. Pilot orifice may be plugged
(check for spider webs or other material).
b. Check for doorway and high movement areas.
For qualified service technicians.
MONTEREY TOP VENT GAS WALL HEATER 41
ISSUE
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
a. Tighten blower screws.
b. Clean blower wheel.
c. Straighten or replace.
a. Select fan speed.
a. Check vent pipe for blockage, such as bird nests,
twigs, leaves, etc. Check that the vent cap is
properly installed, and not placed too far down on
the vent pipe. Cap must be the same
manufacturer as the vent.
b. The vent should terminate a minimum of 12 feet
above the floor plate. The top of the vent must be a
t least 2 feet above any obstacle within a 10 foot
radius, including the roof.
c. All type “B” vents shall extend in a vertical direction
with offsets not exceeding 45 degrees. Any angle
greater than 45 degrees from vertical is considered
horizontal. Any offsets used should be a minimum
of 2-feet above the draft hood or as far away as
possible to allow venting to begin before any
restriction is encountered. The use of too many
offsets may also prevent proper venting.
d. Use listed B/W type vent pipe. DO NOT use transite
or any other type of ceramic pipe for venting. DO
NOT use single wall vent pipe. When venting into a
masonry chimney, the chimney must be properly
lined and sized for this gas furnace. The use of type
“B” or flexible chimney liner is recommended.
e. Check the connection on both the switch and the
gas valve. Tighten if necessary.
a. Adjust pilot flame. Refer to “How to Care for Your
Furnace” section in this manual.
b. Check installation. Casing may be distorted by
being fastened to an uneven opening or jammed
under the header. A restricted vent may create
expansion noise. Refer to “Vent Installation” section
in this manual.
c. Check vent system for a blocked flue, excessive
down draft (wind) or negative pressure in room
caused by a ventilating fan or a fire in a fireplace.
d. Furnace is possibly overrated, check for high gas
pressure at gas valve. (See 4B).
e. Check the manifold gas pressure. Check the rate,
this appliance is manufactured for elevations up to
4,500 feet. It must be derated for operation above
4,500 feet.
f. Check burner for obstructions. Install new burner
and pilot orifices.
g. Remove pilot orifice, check and clean.
h. DO NOT elevate the furnace off the floor unless
supported by the free standing accessory. Never
shear the legs. If replacing the furnace, bring the
vent pipe to the header. DO NOT raise the furnace
to the vent pipe. Legs must be flat on the floor
plate, never one in front of the other.
a. Housing rattling.
b. Blower dirty.
c. Blower wheel bent.
a. Fan switch not set.
a. Blockage in vent pipe.
b. Vent too short.
c. Restriction in vent system
caused by offsets.
d. Incorrect vent pipe.
e. Loose connections on the vent
safety wiring harness.
a. Delayed ignition. Pilot flame
may be too low.
b. Expansion noise, ticking.
c. Combustible gas spillage.
d. Excessive flame roll-out.
e. Burner is over-fired.
f. Yellow burner flame.
g. Yellow pilot flame.
h. Expansion noise
7. Noisy blower.
8. Blower does not run.
9. Main burner will not stay on.
10. Abnormal operation.
42
If your furnace fails to work correctly, you may avoid the
inconvenience and cost of a service call by checking the
troubleshooting section on page 40 before you call
for service.
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
DO NOT store or use gasoline or other flammable vapors
and liquids in the vicinity or this or any other appliance.
HOW TO ORDER REPAIR PARTS
When ordering repair parts, always give the following
Information:
1. MODEL NUMBER
2. MFG. DATE CODE
3. PART NUMBER
4. PART DESCRIPTION
All parts listed herein may be ordered from your equipment
supplier. The Model Number of your Williams wall furnace
will be found on the nameplate near gas valve, inside control
compartment.
WHAT TO DO IF YOU SMELL GAS
• Open all of the windows.
• Do not try to light any appliance.
• Do not touch any electrical switch.
• Do not use any phone or cell phone in your building.
• Extinguish any open flame.
• Immediately call your gas supplier from a neighbor’s
phone. If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
HINTS AND INFORMATION
All installations in the State of Massachusetts must use
the following requirements when installing, maintaining
or operating direct-vent propane or natural gas-fired
space heaters.
For direct-vent appliances, mechanical-vent heating
appliances or domestic hot water equipment, where the
bottom of the vent terminal and the air intake is installed
below four feet above grade the following requirements
must be satisfied:
1. If there is not one already present, on each floor level
where there are bedroom(s), a carbon monoxide
detector and alarm shall be placed in the living area
outside the bedroom(s). The carbon monoxide detector
shall comply with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall be located in the
room that houses the appliance or equipment and shall:
a. Be powered by the same electrical circuit as the
appliance or equipment such that only one
service switch services both the appliance and the
carbon monoxide detector.
b. Have battery back-up power;
INSTALLATIONS IN THE STATE
OF MASSACHUSETTS
c. Meet ANSI/UL 2034 Standards and comply with
NFPA 720 (2005 Edition); and
d. Have been approved and listed by a Nationally
Recognized Testing Laboratory as recognized under
527 CMR.
A CARBON MONOXIDE DETECTOR SHALL:
a. Be located in the room that houses the appliance or
equipment;
b. Be either hard-wired or battery powered or both; and
c. Shall comply with NFPA 720 (2005 Edition).
3. A product-approved vent terminal must be used,
and if applicable, a product-approved air intake must
be used. Installation shall be in strict compliance with
the manufacturer’s instructions. A copy of the installation
instructions shall remain with the appliance or
equipment at the completion of the installation.
4. A metal or plastic identification plate shall be mounted
at the exterior of the building, four feet directly above
the location of vent terminal. The plate shall be of
sufficient size to be easily read from a distance of
eight feet away, and read “Gas Vent Directly Below”.
MONTEREY TOP VENT GAS WALL HEATER 43
SERVICE RECORD
DATE MAINTENANCE PERFORMED COMPONENTS REQUIRED
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P322087_F 02/25
