MANUAL 10042-SB REV 0 (06/21)
$21.00
GAS BOILERS
MANUAL SECTION CO
IMPORTANT FOR FUTURE REFERENCE
Please complete this information and retain this
manual for the life of the equipment:
Model #:
___________________________
Serial #:
___________________________
Date Purchased:
_____________________
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury
or death. Read the installation, operating and maintenance instructions thoroughly before installing or
servicing this equipment.
Model CG-220S
Gas Boilers
CG-220S, CG-325S & CG-330S
Installation & Operation Manual
SOUTHBEND STEAM
A Middleby Company
1100 Old Honeycutt Road Fuquay-Varina, North Carolina 27526 USA
www.southbendnc.com
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Gas Boilers
SAFETY PRECAUTIONS
Before installing and operating this equipment, be sure everyone involved in its operation is fully trained and aware of
precautions. Accidents and problems can be caused by failure to follow fundamental rules and precautions.
The following symbols, found throughout this manual, alert you to potentially dangerous conditions to the operator,
service personnel, or to the equipment.
CAUTION
WARNING
NOTICE
This symbol warns of immediate hazards that will result in severe injury or death.
This symbol refers to a potential hazard or unsafe practice that could result in injury or death.
This symbol refers to a potential hazard or unsafe practice that could result in injury, product
damage, or property damage.
This symbol refers to information that needs special attention or must be fully
understood, even though not dangerous.
DANGER
WARNING
Improper installation, operation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read
the installation, operating and maintenance instructions thoroughly before installing, operating or servicing this equipment.
NOTICE
PURCHASER: Instructions to be followed in the event that the operator of this appliance smells gas must be posted in
a prominent location. This information shall be obtained by consulting the local gas supplier.
Do not attempt to operate this unit in the event of a power failure.
Keep the appliance area free and clear from combustibles.
Do not obstruct the ow of combustion and ventilation air.
Adequate clearances must be maintained for servicing and proper operation.
NOTICE
Contact the factory, the factory representative or local service company to perform maintenance and repairs.
Copyright © 2021 by Southbend Steam. All rights reserved. Published in the United States of America.
Specifications
IMPORTANT NOTES FOR INSTALLATION AND OPERATION
WARNING
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages
that follow this symbol to avoid possible injury or death.
WARNING
FOR YOUR SAFETY:
Do not store or use gasoline or other ammable vapors or liquids in the vicinity of this or any other appliance.
NOTICE
This manual should be retained for future reference.
It is recommended that this manual be read thoroughly and that all instructions be followed carefully.
NOTICE
This product is intended for commercial use only. NOT FOR HOUSEHOLD USE.
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Gas Boilers
RETAIN THIS MANUAL FOR FUTURE REFERENCE.
Table of Contents
Important Notes For Installation and Operation .................................................................... 2
Service Connections ............................................................................................................. 4
Introduction ........................................................................................................................... 5
Installation Instructions ......................................................................................................... 6
Operation .............................................................................................................................. 9
Operation Instructions for Boilers with CSD-1 Controls ................................................... 11
Periodic Maintenance ........................................................................................................... 13
Adjustments .......................................................................................................................... 15
Troubleshooting .................................................................................................................... 16
Table of Contents
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Gas Boilers
SERVICE CONNECTIONS
Service Connections
DIMENSIONS
WATER QUALITY STATEMENT
Water quality is the major factor aecting the performance of your appliance. If you are unsure of water quality, consult a local water treatment specialist and have the
water analyzed. Your water supply must be within these guidelines.
Total dissolved solids ................................Less than 60 PPM
Total alkalinity ...........................................Less than 20 PPM
Silica ..........................................................Less than 13 PPM
Chlorine ....................................................Less than 1.5 PPM
pH Factor .................................................7.0 - 8.5
Water which does not meet these standards should be treated with the installation of a water conditioner.
FAILURE OR MALFUNCTION OF THIS APPLIANCE DUE TO POOR WATER QUALITY IS NOT COVERED UNDER WARRANTY.
SERVICE CONNECTIONS
– ELECTRICAL CONNECTION: Unless otherwise specied, Field Wiring
Electrical Connection to be 120V, 60 Hz, single phase with grounding wire.
– DRAIN: 2” (51 mm) IPS piped to open oor drain. No Solid Connection.
– GENERATOR WATER: 1/2” (13 mm) NPT at 25-50 PSI (170-345 kPa).
– CONDENSATE COLD WATER: 1/2” (13 mm) NPT at 25-50 PSI (170-345 kPa).
– GAS CONNECTION: 3/4” (19 mm) IPS supply line required.
Natural gas: min. 7” (178 mm) Water Column.
Propane: min. 11” (279 mm) Water Column.
– STEAM TAKE-OFF CONNECTION: 3/4” (19 mm) IPS.
Model
Shipping
Weight
BTU/Hr Units A B C D E F G H J K L M Minimum Clearance*
CG-220S
375 lbs
(170 kg)
200,000
Inches
(mm)
8.75”
(222)
5.75”
(146)
10.88”
(276)
23.88”
(606)
6.38”
(162)
3.5”
(89)
10”
(254)
5.13”
(130)
6.38”
(162)
4”
(102)
14.75”
(375)
2.75”
(70)
Sides
Back
3” (76)
6” (152)
CG-325S
475 lbs
(215 kg)
250,000
24”
(610)
6.88”
(175)
6.88”
(175)
6.88”
(175)
5.75”
(146)
13.5”
(343)
4.75”
(121)
CG-330S
475 lbs
(215 kg)
300,000
21”
(533)
* Use on non-combustible oors only.
As continued product improvement is a policy of Southbend Steam, specications are subject to changge without notice.
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Gas Boilers
GENERAL
The gas boiler is designed to ASME Code and approved as a steam heating boiler restricted to operation at pressure
not to exceed 15 psi. The gas boiler may be in a 24” cabinet base rated at 140,000 or 200,000 BTU, 36” cabinet base
rated at 140,000, 200,000, 250,000 or 300,000 BTU, operational on Natural or Propane gas. Boilers may have optional
electronic ignition and CSD-1 controls.
INTRODUCTION
Introduction
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Gas BoilersInstallation
Unpacking
IMMEDIATELY INSPECT FOR SHIPPING DAMAGE
Immediately after unpacking, check for possible shipping damage. If the appliance is found to be damaged, save the
packaging material and contact the carrier within 15 days of delivery.
We cannot assume responsibility for damage or loss incurred in transit.
Before installing, verify that the gas (natural or propane), the elevation from sea level and the electrical supply agree
with the specication on the data plate. NOTE: If this appliance is being installed above 2,000 feet altitude, contact your
authorized service oce to assure that the proper orice size for your elevation has been installed.
INSTALLATION INSTRUCTIONS
Location
The installation location must be kept free and clear of combustibles. Do not obstruct the ow of combustion and
ventilation air. Clearance from combustible construction must be a minimum of 3 inches from the sides and 6 inches
from the back. The appliance should be installed on a noncombustible oor. Provide adequate clearances for cleaning,
maintenance, service and proper operation.
Sucient air should be allowed to enter the room to compensate for the amount of air removed by any ventilating system
and for combustion of the gas burners. Do not obstruct the air ow into and around the appliance. Do not obstruct the ow
of ue gases from the ue duct located at the rear and above the cabinet. Position the appliance in its nal location. Check
that there are sucient clearances to service the controls, for door swings, etc., so there will be no problem in making the
required supply and drain connections.
Allow enough space between any other piece of equipment or a wall for service access.
Service on the cabinet base may require access to the left and/or right side panels.
Leveling and Anchoring the Cabinet
1. Place appliance in the installation position.
2. Place a carpenter’s level on top of the appliance and turn the adjustable feet to level side-to-side and front-to-back.
3. Mark hole locations on the oor through the anchoring holes provided in the rear anged adjustable feet.
4. Remove appliance from installation position and drill holes in locations marked on the oor. Insert proper anchoring
devices (not supplied).
5. Place appliance back in the installation position.
6. Place carpenter’s level on top of appliance and re-level side-to-side and front-to-back.
7. Bolt and anchor appliance securely to the oor.
8. Seal bolts and anged feet with Silastic or equivalent compound.
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Gas Boilers
Installation Codes and Standards
The boiler must be installed in accordance with:
Gas installation to conform to local codes, or in absence of local codes, with the National Fuel Gas Code - ANSI Z223.1/NFPA 54,
or the Natural Gas and Propane Installation Code, CSA B149.1, as applicable, including:
1. The appliance and its individual shut o valve must be disconnected from the gas supply piping system during any
pressure testing of that system at pressures in excess of 1/2 psig (3.5 kPa).
2. The appliance must be isolated from the gas supply piping system by closing its individual manual shut o valve
during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).
Electrical grounding must be provided in accordance with local codes, or in the absence of local codes, with the National
Electrical Code ANSI/NFPA 70. In Canada, installation must be in accordance with the Canadian Electrical Code CSA C22.2.
WIRING DIAGRAM FOR APPLIANCE IS LOCATED INSIDE CABINET DOOR.
Exhaust Fans and Canopies
Canopies are set over ranges, ovens, kettles, etc., for ventilation purposes. It is recommended that a canopy extend 6 inches
past the appliance and be located 6 feet 6 inches from the oor. Filters should be installed at an angle of 45 degrees or more
with the horizontal. This position prevents dripping of grease and facilitates collecting the run-o grease in a drip pan, usually
installed with the lter. A strong exhaust fan tends to create a vacuum in the room and may interfere with burner performance
or may extinguish pilot ames. Makeup air openings approximately equal to the fan area will relieve such vacuum. In case of
unsatisfactory performance on an appliance, check with the exhaust fan in the “OFF” position.
Connections
Plumbing Connections
Water Supply Connection
The incoming cold water supply connection, at the rear of the steamer cabinet, requires 3/8” tubing and water pressure of 25 - 50 psi.
A manual shut-o valve must be provided convenient to the appliance; this valve should be open when the boiler is in operation.
FAILURE OR MALFUNCTION OF THIS APPLIANCE DUE TO POOR WATER QUALITY IS NOT COVERED UNDER
WARRANTY. SEE WATER QUALITY STATEMENT.
Drain Connection
The drain (2” IPS) should be piped to a oor drain near the unit. There should be no solid drain connection; an “open gap”
between the boiler and the oor drain is required.
NOTICE
If this equipment is being installed at over 2,000 feet altitude and was not so specied on order, contact service
department. Failure to install with proper orice sizing may void the warranty.
WARNING
Plumbing connections must comply with applicable sanitary, safety, and plumbing codes.
Installation
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Electrical Connections
120 VAC-60 Hz - Single Phase
Refer to the electrical diagram located inside cabinet on door.
Codes require that a gas shut-o valve be installed in the gas line prior to the unit. Make sure the pipes are clean and free
of obstructions, dirt, and piping compound.
Gas Connection
1. The data plate on the cabinet door of the boiler indicates the type of gas your unit is equipped to burn. DO NOT
connect to any other gas type.
Keep the appliance area free and clear from combustible substances. Do not obstruct the ow of combustion and
ventilation air.
2. A 3/4” NPT line is provided at the rear for the connection. Each boiler is equipped with an internal pressure regulator
which is set at 3.5” W.C. manifold pressure for natural gas or 10.5” W.C. for LP gas. Use the 1/8” pipe tap on the
burner manifold for checking pressure
An adequate gas supply is necessary. Undersized or low pressure lines will restrict the volume of gas required for
satisfactory performance. A steady supply pressure, between 7” W.C. and 14” W.C. for natural gas and 11” W.C. and 14”
W.C. for propane gas is recommended. With all units operating simultaneously, the manifold pressure on all units should
not show any appreciable drop. Fluctuations of more than 25% on natural gas, and 10% on propane gas, will create pilot
problems and aect burner operating characteristics.
Contact your gas company for correct supply line sizes.
Purge the supply line to clean out any dust, dirt, or foreign matter before connecting the line to the unit.
CAUTION
The pipe thread compound used when installing pipes must be a type that is resistant to the action of liquied
petroleum or propane gases.
WARNING
Prior to start-up, check all joints in the gas supply line for leaks. Use soap and water solution. Do not use
an open flame.
WARNING
Electrical and grounding connections must comply with the applicable portions of the National Electrical
Code and/or other local codes.
Installation
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Gas Boilers Operation
OPERATION
WARNING
Do not force the gas control knob. Use only your hand to turn the gas control knob. Never use any tool. If the
gas control knob will not operate by hand the gas control should be replaced by a qualied service technician.
WARNING
Do not disassemble the gas control; it contains no replaceable components. Attempted disassembly or
repair may damage the gas control.
WARNING
In the event of main burner ignition failure, a 5 minute purge period must be observed prior to re-establishing
ignition source.
For CSD-1 equipped boilers, see this section for Operation Instructions for CSD-1 Equipped Boilers.
Boiler Controls (Inside Cabinet)
Main Power Switch - ON lls the boiler tank and turns the boiler controls on. You should allow 20 minutes to ll
the tank and generate steam.
- OFF shuts o the boiler controls and opens the automatic blowdown valve, emptying the
boiler tank and releasing water and steam to the drain. This should be done at least once
daily to remove sediment, lime, or scale.
Pilot Light - Indicates main power is ON.
Boiler Pressure Gauge - Should read 9 -11 psi during operation; 0 psi during shutdown.
Water Level Sight Glass - Observe level of water in the boiler and water quality. Murkiness in the water indicates
inadequate water quality; the owner must supply proper water to the boiler (See page 4
Water Quality Statement).
Water Level Control - While ON, briey open the water level control once each week to remove any sediment
that might accumulate.
Safety Valve - This valve will release (pop o) if the boiler has too much pressure. Once a week, this
valve should be tripped during operation to make sure it functions properly.
CAUTION
If you smell gas during the lighting procedure, immediately shut off the gas supply until the leak has
been corrected.
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Gas Boilers
1. START-UP - BOILER OPERATION WITH STANDING PILOT IGNITION
Open manual gas shut o supply valve and if the appliance has a manual blowdown valve, close it. Open cabinet door
and turn ON power switch located on left side. Green pilot light will come on, water will begin to enter boiler and required
water level will be reached in about three minutes. Observe water gauge glass to verify.
The dial on the combination gas control valve has three positions (ON-PILOT-OFF) for manual gas control of main
burners and pilot. Turn DIAL to PILOT. Depress dial and light pilot burner located on centre main burner of boiler. Maintain
dial in depressed position for about 30 seconds and release. Observe that the pilot burner ame stays on. If at any time
the ame should become extinguished, a 5 minute period of complete shut o of gas supply is required before relighting.
Turn dial to ON and burners should ignite. Steam generation will now commence and be completed in approximately
15 minutes. Steam generation should reach approximately 11 psi as indicated on the pressure gauge on the boiler.
2. START UP - BOILER OPERATION WITH ELECTRONIC IGNITION
Open manual gas supply valve.
Open cabinet door and turn main power switch ON. Green pilot light will come on, water will begin to enter boiler and
required water level will be reached in about 3 minutes. Observe water gauge sight glass to verify.
The dial on the gas combination control valve has 2 positions (ON and OFF).
ON - [Rotated counter-clockwise] permits gas to ow to the pilot and main burner.
OFF - [Rotated clockwise] prevents gas ow to pilot and main burner.
NOTE: Units are shipped with the control in the ON position.
With the gas control valve, power switch and water supply all ON, water begins entering the boiler and gas ows to the
pilot: Spark will begin in 2 to 3 seconds. If the pilot fails to light in 90 seconds, the control will provide 100% lockout. If this
occurs: Wait 5 minutes, then turn power switch o for one minute before turning power switch back on.
Once the pilot is lit and the required water level has been reached, the main burners will ignite. Burners will cycle to meet the
steam pressure required. Steam pressure should reach approximately 11 psi as indicated on the pressure gauge on the boiler.
DAILY SHUT DOWN
Turn power switch o.
Open blowdown valve if so equipped.
COMPLETE BOILER SHUT DOWN
If boiler is not intended to be operated for a lengthy period of time, shut o all power, gas and water supplies to the
appliance. Open blowdown valve if so equipped.
Operation
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Operation Instructions for Boilers with CSD-1 Controls
INITIAL START-UP PROCEDURE
1. Open the manual gas shut-o supply valve.
2. Close the manual blowdown valve, if so equipped.
3. Light the pilot burner.
The dial on the gas combination valve has three positions (ON - OFF - PILOT) for manual gas control of main
burners and pilot burner. Turn the dial to “PILOT”. Depress the dial and light the pilot burner on the centre
burner of boiler. Maintain the dial in depressed position for about 30 seconds and release. Observe that the
pilot ame stays ON. Turn dial to “ON”.
4. Open cabinet door and turn “ON” the power switch. The green pilot light will come “ON”.
Water should begin to enter the boiler. When enough water has entered the boiler the (amber)
“STANDBY” pilot light will come on.
5. Press the “RESET” switch to begin boiler operation. The “STANDBY” pilot light will go off
and the boiler will begin operation.
If at any time the flame should become extinguished, a five (5) minute purging is
required before relighting is attempted.
Daily Startup Procedure
1. Close the manual blowdown valve, if so equipped.
2. Examine that the pilot burner ame is burning. If the pilot burner is out, a ve (5) minute period of complete gas supply
shut o is required before relighting. Follow initial start up instructions above.
3. Open cabinet door and turn “ON” the power switch. The green pilot light will come “ON”. Water will begin to enter the
boiler. When enough water has entered the boiler the (amber) “STANDBY” pilot light will come on.
4. Press the “RESET” switch to begin the boiler operation. The “STANDBY” pilot light will go o and the boiler will
begin operation.
Daily Shutdown Procedure
1. Turn “OFF” the power switch. Observe that the burners go o.
2. Open the manual blowdown valve, if so equipped. If the appliance is equipped with an automatic blowdown solenoid
valve, the boiler’s contents, water and steam will be blown out and exhausted through the appliance drain. The cold
water solenoid valve will be activated.
Complete Shutdown Procedure
If the appliance is not intended to be operational for a lengthy period, then shut it down completely.
1. Open the manual blowdown valve, if so equipped.
2. Shut o all supplies of power, gas and water to the appliance.
Operation
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Gas Boilers
Normal Boiler Operating Cycle
Water Fill Cycle
On the initial lling of the boiler, the reset switch must be activated to initialize the safety lockout circuit. Once the water in
the boiler has reached the proper level, the level control will stop the ow of water to the boiler. As water is consumed in
the production of steam, the level control will replenish water to the boiler.
Firing Cycle
The gas valve is controlled by pressure sensing devices. On initial operation of the boiler, steam generation should reach
11 psi in approximately 15 minutes. At this point the “Operating Pressure” switch will close the gas valve. When pressure
drops to 9 psi, the pressure switch opens the gas valve and ignition should occur.
Should the pressure rise to more than 14.5 psi the “Overrride pressure switch” will open the override solenoid valve,
releasing the excess steam.
Condensing Drain
A thermostat is located in the drain assembly and is activated by the temperature of steam. The thermostat opens the
cooling solenoid valve, supplying water to the drain to condense the steam.
Automatic Blowdown Valve
If the unit has an automatic blowdown valve, it is activated by the main power switch. The boiler will drain should the main
power switch be turned “OFF.”
Safety Lockout Conditions
High Temperature Condition
A high temperature safety device is installed on the boiler. Should the temperature exceed the limit of this device, the boiler will
be shut down and be put in a state of lockout. The “Temperature” pilot light (Red), and the “Standby” pilot (amber), will come on.
High Pressure Condition
A high pressure safety switch is installed on the boiler. Should the pressure exceed the limit of this device, the boiler will
be shut down and be put into a state of lockout. The “Pressure” pilot light (Red), and the Stand By pilot (amber), will come
on. Should this device fail to operate, the safety relief valve will open.
Low Water Condition
A second low water safety cut o is supplied with the boiler. Should the water level fall below normal operating levels,
this device will activate and put the boiler in a state of lockout. The “Low Water” pilot light (Red), and the “Stand By” pilot
(amber) will come on.
Operation
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Gas Boilers Perodic Maintenance
PERIODIC MAINTENANCE
WARNING
Disconnect the unit from the power supply before cleaning or servicing appliance.
IMPORTANT INSTRUCTIONS
Be sure to ush your boiler water level control daily. Failure to follow this procedure can cause the control to malfunction
resulting in serious boiler damage.
The Boiler Water Level Control installed on your boiler requires periodic maintenance. As boiler water circulates into
the oat chamber, sand, scale and other sediment may be deposited in the oat chamber. While the chamber has been
designed with a large accumulation bowl, it is necessary to ush the sediment from the chamber by blowing down the
control so that the accumulation of sediment does not interfere with the movement of the oat in the control.
Control must be ushed at least once a day.
CAUTION
Protect yourself. When ushing control, hot water and steam will ow out of the drain.
When ushing control, note water level in gauge glass, allow the boiler to ll if necessary, and also to come up to
temperature.
Before ushing control, note that water level in gauge glass is within operating range and the boiler pressure is at least
6 psi. While the boiler is being red, open blowdown valve at bottom of control by rotating the handle counter-clockwise
about 1/4 turn to fully open the valve.
Opening the blowdown valve also checks the cut-o operation. Float should drop shutting burners o, hot water and
steam will ow out the drain ushing away sediment.
CAUTION
If burner does not shut o during blowdown, immediately discontinue use of appliance and call for service.
Continue draining water for about fteen (15) seconds, from control until water is clean. Manually close valve. Recheck gauge
glass. If water level has dropped signicantly, wait for the boiler to restore water level and pressure and repeat if necessary.
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Gas Boilers
Periodic Maintenance
1. If water in sight glass is not clear and appears murky, this indicates poor water quality and may cause control failure.
(SEE WATER QUALITY STATEMENT, page 4.)
2. Safety valve should be tripped during operation once a week to ensure that it is functioning properly.
3. Clean around burners and orices if lint has accumulated.
4. Visually ensure carry over ports are unobstructed.
5. Visually check that the ue is not obstructed.
Cleaning
DO NOT allow water near the electrical components.
At the end of the day, turn the Main Power Switch OFF (automatic blowdown drains the boiler tank) or if equipped with
manual blowdown valve, open. Wash exterior with mild detergent and warm water, rinse, and wipe dry. Do not use steel
wool on stainless steel surfaces.
Removal of Lime Scale Deposits
The interior of the steam boiler should be inspected at least twice a year by your authorized servicer to determine whether
the boiler needs to be delimed. The servicer should perform any necessary deliming procedure. See descaling instructions.
Vent Hood
Twice a year check the venting system (hood); remove any obstructions; and clean as necessary.
Boiler Descaling Instructions
It is recommended that the boiler should be checked every 90 to 120 days for scale build up. Regular maintenance should
be carried out at this time.
If the boiler has been descaled, a new Anode should be installed in the boiler to help extend its life.
1. With boiler empty, close manual blowdown valve. If appliance is equipped with automatic blowdown, turn water supply
OFF to appliance. Turn power switch ON. This will energize and close blowdown valve.
2. Remove 3/4” pipe plug from tting on left front of boiler.
3. Insert appropriate hose or tube through tting and pour in (1/2) half gallon (U.S.) of CLR Descaling Solution or use the
Optional Deliming Assembly DPA-1 available from your dealer.
For appliances equipped with CSD-1, descaling solution must be introduced through hand hole.
4. Replace 3/4” pipe plug securely.
5. Open water supply to appliance allowing water to ll boiler to required level.
6. Let appliance cycle, allow two hours for descaling and cleaning. DO NOT TURN STEAM ON TO CONNECTED
APPLIANCES OR TO UPPER COMPARTMENTS.
7. Open both the blowdown and low water level control valves for complete drainage. Then close both valves.
For appliances equipped with automatic blowdown, turn OFF power switch and open low water control valve. This will
allow complete drainage. Once drained close water level control valve.
8. Turn appliance switch ON. When boiler is completely lled, turn power switch OFF. This will rinse and drain boiler.
Appliance with manual blowdown valve must be opened to drain.
9. Complete Step 8 twice to assure boiler is completely rinsed.
10. Appliance is now ready for use.
Perodic Maintenance
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Gas Boilers
Adjustments
Adjustments
WARNING
At least twice a year have an authorized service technician clean and adjust the unit for maximum performance.
Calibrate Pressure Switches
NOTICE
Pressure switches are factory set. Calibration is only required if pressure switches are replaced or if adjustment is required.
Pressure switch range is from 1 to 15 psi.
Adjust all settings to maximum on high signal adjustment screw on pressure switches.
Adjust in the following sequence:
- High limit pressure switch.
- Override pressure switch.
- Operating pressure switch.
- Turning screw clockwise to increase, counter-clockwise to decrease pressure.
- Use relief valve to release pressure from boiler for setting adjustments.
1. HIGH LIMIT PRESSURE SWITCHES
Allow pressure to build until unit shuts o. This should occur at 15 psi. Set the high signal to switch at 14.5 psi on the
gauge and the low signal to 13.0 psi.
2. OVERRIDE PRESSURE SWITCHES
Allow pressure to increase to 13 psi. Set the high signal to switch at 13 psi on the gauge and the low signal to 11 psi.
3. OPERATING PRESSURE SWITCHES
Set the high signal to switch at 11 psi on the gauge and the low signal to 9 psi.
4. Release pressure in boiler to below 9 psi. Burner will come on. Once pressure has reached 11 psi, burners will shut
o. Repeat this process several times to make sure burners come on at 9 psi and shut o at 11 psi.
Once completed, pressure switches have been calibrated.
Should your unit not have the High Limit pressure switch, start procedure at Override pressure switch.
Service
NOTICE
Contact your local authorized service oce for any repairs or adjustments needed on this equipment.
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Gas Boilers
Troubleshooting
Troubleshooting
WARNING
The boiler and its parts are hot. Use care when operating, cleaning, or servicing the boiler.
Burners Produce Carbon Deposits
1. Wrong size orices.
2. Burner air not adjusted properly.
3. Wrong gas supply.
4. Incorrect pressure at supply.
Pilot Does Not Light
1. Gas supply to unit is OFF.
2. Power supply is OFF.
3. Gas control knob is OFF.
4. Dirty or loose wire connection to module - clean and/or tighten.
5. Ignitor cable, shorting out - check that not in contact with metal or damaged; may require replacement.
6. Defective control or module.
7. Unit goes into 100% lockout - turn o and try again in ve minutes.
8. Dirty ame sensor - clean with emery cloth.
9. Cracked ceramic insulator - replace pilot burner/ignitor sensor.
10. Too much draft.
Burner Does Not Come On
1. Gas supply to unit is “OFF”.
2. Manual shut o valve is “OFF”.
3. Power supply is “OFF”.
4. Faulty valve or ignition module.
5. Pilot out.
6. Pilot may require ame adjustment.
7. Water level has not been reached in boiler. Check water supply is on, check water level control.
8. If water at proper level, check relay which energizes pressure switch and gas control.
9. Pressure switch may need to be replaced if relay is operating.
10. Gas control may also require replacement if energized but not operating.
INSTALLATION & OPERATION MANUAL 10042-SB REV 0 (06/21)
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Gas Boilers Troubleshooting
Safety Relief Valve Blows
1. Defective safety valve.
2. Pressure too high. Pressure switch requires adjustment (lower) or may be defective.
Water Not Being Supplied to Boiler
1. Water supply is “OFF”.
2. Defective water ll solenoid valve.
3. Water level control clogged or defective, unable to operate ll valve.
4. Check drain valve is closed. Also check that water level control valve is closed.
5. Supply water pressure too low.
Boiler Slow to Heat Up
1. Lime build up - contact service.
INSTALLATION & OPERATION MANUAL 10042-SB REV 0 (06/21)
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Gas Boilers
Notes
INSTALLATION & OPERATION MANUAL 10042-SB REV 0 (06/21)
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Gas Boilers
Notes
INSTALLATION & OPERATION MANUAL 10042-SB REV 0 (06/21)
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Gas Boilers
CG-220S, CG-325S & CG-330S
Gas Boiler
A product with the Southbend Steam name incorporates the best in durability and low maintenance. We all recognize,
however, that replacement parts and occasional professional service may be necessary to extend the useful life of this
appliance. When service is needed, contact a Southbend Steam Authorized Service Agency, or your dealer. To avoid
confusion, always refer to the model number, serial number, and type of your appliance.
SOUTHBEND STEAM
A Middleby Company
1100 Old Honeycutt Road Fuquay-Varina, North Carolina 27526 USA
www.southbendnc.com
