AMST***U1400**
AIR HANDLERS INSTALLATION &
OPERATING INSTRUCTIONS
© 2021-2022
19001 Kermier Rd., Waller, TX 77484
www.daikinac.com
RECOGNIZE THIS SYMBOL
AS A SAFETY PRECAUTION.
NOTE: SPECIFICATIONS AND PERFORMANCE DATA LISTED HEREIN
ARE SUBJECT TO CHANGE WITHOUT NOTICE
Contents
1 Important Safety Instructions .................................... 2
2 Shipping Inspection ................................................... 3
2.1 Parts ....................................................................... 3
2.2 Handling ................................................................. 3
2.3 Shipping Material Removal..................................... 3
2.3.1 Blower Support Bracket Removal ....................... 3
3 Codes & Regulations ................................................. 3
4 Replacement Parts ..................................................... 4
5 Pre-Installation Considerations ............................... 4
5.1 Preparation ............................................................. 4
5.2 System Matches ..................................................... 4
5.3 Interconnecting Tubing ........................................... 4
5.4 Clearances ............................................................. 4
5.5 Horizontal Applications ........................................... 4
6 Installation Location ................................................... 4
6.1 Upow Installation .................................................. 5
6.2 Horizontal Left Installation ...................................... 5
6.3 Horizontal Right Installation / Downow Installation 5
6.4 Humid Environment Installations ............................ 6
6.4.1 All Installations – Humid Environments ............... 6
6.4.1.2 Downow Installations – Humid Environments 6
6.4.1.3 Horizontal Installations – Humid Environments 6
7 Refrigerant Lines ........................................................ 7
7.1 Tubing Size ............................................................. 7
7.2 Tubing Preparation ................................................. 7
7.3 Tubing Connections ................................................ 7
7.4 Thermal Expansion Valve System Adjustment ....... 9
8 Condensate Drain Lines ........................................... 10
9 Ductwork .................................................................... 11
9.1 Return Ductwork .................................................... 11
10 Return Air Filters ..................................................... 11
11 Electric Heat ............................................................. 11
12 Electrical and Control Wiring ................................. 12
12.1 Building Electrical Service Inspection .................. 12
12.2 Wire Sizing .......................................................... 12
12.3 Maximum Overcurrent Protection (MOP) ............ 12
12.4 Electrical Connections – Supply Voltage ............. 13
12.4.1 Air Handler Only (Non-Heat Kit Models) ........... 13
12.4.2 Air Handler - Non-Circuit Breaker Heat Kits ..... 13
12.4.3 Air Handler With Circuit Breaker Heat Kit ......... 13
12.5 Low Voltage Connections .................................... 13
12.5.1 Thermostats ...................................................... 13
12.6 Speed Tap Adjustment ......................................... 14
12.6.1 Selecting Speed Taps 1-5 ................................. 14
12.6.2 Selecting Speed Taps 6-9 ................................. 14
12.6.3 AMST60DU1400** (ONLY) ............................... 14
13 Achieving 1.4% Low Leakage Rate ....................... 16
14 Start-Up Procedure.................................................. 16
15 Regular Maintenance .............................................. 16
16 Airow Data ............................................................... 17
17 Air Handler Low Voltage Connections ................... 19
18 Wiring Diagrams ...................................................... 20
19 Start-Up Checklist .................................................... 26
ONLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL,
ADJUST, SERVICE OR REPAIR(HEREINAFTER, “SERVICE”)
THE EQUIPMENT SPECIFIED IN THIS MANUAL SHOULD
SERVICE THE EQUIPMENT. THE MANUFACTURER WILL
NOT BE RESPONSIBLE FOR ANY INJURY OR PROPERTY
DAMAGE ARISING FROM IMPROPER SERVICE OR SERVICE
PROCEDURES. IF YOU SERVICE THIS UNIT, YOU ASSUME
RESPONSIBILITY FOR ANY INJURY OR PROPERTY
DAMAGE WHICH MAY RESULT. IN ADDITION, IN
JURISDICTIONS THAT REQUIRE ONE OR MORE LICENSES
TO SERVICE THE EQUIPMENT SPECIFIED IN THIS
MANUAL, ONLY LICENSED PERSONNEL SHOULD SERVICE
THE EQUIPMENT.
IMPROPER INSTALLATION, ADJUSTMENT, SERVICING OR
REPAIR OF THE EQUIPMENT SPECIFIED IN THIS MANUAL,
OR ATTEMPTING TO INSTALL, ADJUST, SERVICE OR REPAIR
THE EQUIPMENT SPECIFIED IN THIS MANUAL WITHOUT
PROPER TRAINING MAY RESULT IN PRODUCT DAMAGE,
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
WARNING
2
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING
OR INSTALLING THIS UNIT. MULTIPLE POWER
SOURCES MAY BE PRESENT. FAILURE TO DO
SO MAY CAUSE PROPERTY DAMAGE, PERSON-
AL INJURY OR DEATH.
WARNING
TO PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL
INJURY, OR DEATH, DO NOT STORE COMBUSTIBLE MATERI-
ALS OR USE GASOLINE OR OTHER FLAMMABLE LIQUIDS OR
VAPORS IN THE VICINITY OF THIS UNIT.
WARNING
THIS PRODUCT IS FACTORY-SHIPPED FOR USE WITH
208/240/1/60 ELECTRICAL POWER SUPPLY. DO NOT RECON-
FIGURE THIS AIR HANDLER TO OPERATE WITH ANY OTHER
POWER SUPPLY.
CAUTION
WHEN INSTALLING OR SERVICING THIS EQUIPMENT, SAFE-
TY CLOTHING, INCLUDING HAND AND EYE PROTECTION, IS
STRONGLY RECOMMENDED. IF INSTALLING IN AN AREA THAT
HAS SPECIAL SAFETY REQUIREMENTS (HARD HATS, ETC.),
OBSERVE THESE REQUIREMENTS.
WARNING
TO AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH
DUE TO ELECTRICAL SHOCK, THIS UNIT MUST HAVE AN UNIN-
TERRUPTED, UNBROKEN ELECTRICAL GROUND. THE ELEC-
TRICAL GROUND CIRCUIT MAY CONSIST OF AN APPROPRI-
ATELY SIZED ELECTRICAL WIRE CONNECTING THE GROUND
LUG IN THE UNIT CONTROL BOX TO THE BUILDING ELECTRI-
CAL SERVICE PANEL.
OTHER METHODS OF GROUNDING ARE PERMITTED IF PER-
FORMED IN ACCORDANCE WITH THE NATIONAL ELECTRIC
CODE (NEC) / AMERICAN NATIONAL STANDARDS INSTITUTE
(ANSI) / NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)
70 AND LOCAL/STATE CODES. IN CANADA, ELECTRICAL
GROUNDING IS TO BE IN ACCORDANCE WITH THE CANADIAN
ELECTRIC CODE (CSA) C22.1.
CAUTION
THIS APPLIANCE IS NOT INTENDED FOR USE BY PERSONS
(INCLUDING CHILDREN) WITH REDUCED PHYSICAL, SENSORY
OR MENTAL CAPABILITIES, OR LACK OF EXPERIENCE AND
KNOWLEDGE, UNLESS THEY HAVE BEEN GIVEN SUPERVISION
OR INSTRUCTION CONCERNING USE OF THE APPLIANCE
BY A PERSON RESPONSIBLE FOR THEIR SAFETY. CHILDREN
SHOULD BE SUPERVISED TO ENSURE THAT THEY DO
NOT PLAY WITH THE APPLIANCE.
Carbon monoxide producing devices (such as an automobile, space
heater, gas water heater, etc.) should not be operated in enclosed areas
such as unvenlated garages, ulity rooms or parking areas because of
the danger of carbon monoxide (CO) poisoning resulng from the exhaust
emissions. If a furnace or air handler is installed in an enclosed area such
as a garage, ulity room or parking area and a carbon monoxide producing
device is operated therein, there must be adequate, direct outside
venlaon.
CARBON MONOXIDE POISONING HAZARD
Special Warning for In stallao n of Furnace or Air Handling Units in
Enclosed Areas su ch as Garages, Ulity Rooms or Parking Areas
This venlaon is necessary to avoid the danger of CO poisoning which
can occur if a carbon monoxide producing device connues to operate in
the enclosed area. Carbon monoxide emissions can be (re)circulated
throughout the structure if the furnace or air handler is operang in any
mode.
B10259-216
CO can cause serious illness including permanent brain
damage or death.
Los equipos ó aparatos que producen monóxido
(tal como automóvil, calentador de gas, calentador de
carbono (CO) que resulta de las
emisiones de gases de com busón.
gas, etc) no deben ser operados en áreas cerradas debido al riesgo
de envenenamiento por monóxido de
Si el equipo ó aparato se opera en
dichas áreas, debe exisr una adecuada venlación directa al exterior.
de carbono
agua por medio de
Advertencia especial para la instalación de calentadores ó manejadoras
de aire en áreas cerradas como estacionamientos ó cuartos de servicio.
B10259-216
RIESGO DE INTOXICACIÓN POR MONÓXIDO DE CARBONO
El monóxido de carbono puede causar enfermedades severas
como daño cerebral permanente ó muerte.
Las emisiones de monóxido de carbono pueden circular a través
del aparato cuando se opera en cualquier modo.
Averssement special au sujet de l'installaon d'appareils de chauffage
ou de traitement d'air dans des endroits clos, tets les garages, les
locaux d'entreen et les staonnements.
B10259-216
RISQUE D'EMPOISONNEMENT AUMONOXYDE DE CARBONE
Evitez de mere en marche les appareils produisant du monoxyde
de carbone (tels que les automobile, les appareils de chauffage
autonome,etc.) dans des endroits non venlés tels que les
d'empoisonnement au monoxyde de carbone. Si vous devez faire
fonconner ces appareils dans un endroit clos, assures-vous
qu'il y ait une venlaon directe provenant de l'exterier.
Le monoxyde de
des
carbone peut causer des maladies graves telles que
dommages permanents au cerveau et meme la mort.
Les émissions de monoxyde de carbone peuvent etre recircules dans les
endroits clos, si l'appareil de chauffage ou de traitement d'air sont
en marche.
Cee venlaon est nécessaire pour éviter le danger d'intoxicaon
au CO pouvant survenir si un appareil pro duisant du monoxyde
de carbone connue de fonconner au sein de la zone confinée.
Esta venlación es necesaria para evitar el peligro de envenenamiento
por CO, que puede ocurrir si un monóxido
de carbono sigue operando en el lugar cerrado .
disposivo que produc e
1 Important Safety Instructions
The following symbols and labels are used throughout
this manual to indicate immediate or potential safety
hazards. It is the owner’s and installer’s responsibility to
read and comply with all safety information and instructions
accompanying these symbols. Failure to heed safety
information increases the risk of personal injury, property
damage, and/or product damage.
3
2 Shipping Inspection
Always transport the unit upright; laying the unit on its
side or top during transit may cause equipment damage.
The installer should inspect the product upon receipt for
shipping damage and subsequent investigation is the
responsibility of the carrier. The installer must verify the
model number, specications, electrical characteristics, and
accessories are correct prior to installation. The distributor
or manufacturer will not accept claims from dealers for
transportation damage or installation of incorrectly shipped
units.
2.1 Parts
Inspect the unit to verify all required components are
present and intact. Report any missing components
immediately to the manufacturer or to the distributor. Use
only factory authorized replacement parts (see Section 5).
Make sure to include the full product model number and
serial number when reporting and/or obtaining service
parts.
2.2 Handling
Use caution when transporting / carrying the unit. Do not
move unit using shipping straps. Do not carry unit with
hooks or sharp objects. The preferred method of carrying
the unit after arrival at the job site is to carry via a two-
wheel hand truck from the back or sides or via hand by
carrying at the cabinet corners.
2.3 Shipping Material Removal
IMPORTANT: All Shipping Material used to protect the
equipment, and the equipment’s components, during
transit should be removed before nal installation.
2.3.1 Blower Support Bracket Removal
A shipping bracket (refer to Figure 1) has been factory
installed in this Air Handler to prevent any unintentional
damage to the blower deck assembly during transit. The
shipping bracket should be removed prior to installation. To
remove the shipping bracket, remove the two (2) screws
that secure the bracket to the equipment. Screw (a) is
removed from the control deck and Screw (b) is removed
from the inside corner post. The bracket can be discarded
after removal.
A
B
A
B
Figure 1
Blower Support Bracket Removal
3 Codes & Regulations
This product is designed and manufactured to comply with
applicable national codes. Installation in accordance with
such codes and / or prevailing local codes / regulations is the
responsibility of the installer. The manufacturer assumes no
responsibility for equipment installed in violation of any codes or
regulations.
The United States Environmental Protection Agency
(EPA) has issued various regulations regarding the
introduction and disposal of refrigerants. Failure to
follow these regulations may harm the environment
and can lead to the imposition of substantial nes.
Should you have any questions please contact the local
oce of the EPA and / or refer to EPA’s website www.epa.
gov.
4
4 Replacement Parts
When reporting shortages or damages, or ordering repair
parts, give the complete product model and serial numbers
as stamped on the product. Replacement parts for this
product are available through your contractor or local
distributor. For the location of your nearest distributor
consult the white business pages, the yellow page section
of the local telephone book or contact:
HOMEOWNER SUPPORT
19001 KERMIER ROAD
WALLER, TEXAS 77484
(855) 770-5678
5 Pre-Installation Considerations
5.1 Preparation
Keep this document with the unit. Carefully read all
instructions for the installation prior to installing product.
Make sure each step or procedure is understood and
any special considerations are taken into account before
starting installation. Assemble all tools, hardware and
supplies needed to complete the installation. Some items
may need to be purchased locally. Make sure everything
needed to install the product is on hand before starting.
5.2 System Matches
The entire system (combination of indoor and outdoor
sections) must be manufacturer approved and Air-
Conditioning, Heating, and Refrigeration Institute (AHRI)
listed. NOTE: Installation of unmatched systems is not
permitted.
5.3 Interconnecting Tubing
Give special consideration to minimize the length of
refrigerant tubing when installing air handlers. Refer to
Remote Cooling / Heat Pump Service Manual RS6200006,
and TP-107 Long Line Set Application R-410A for tubing
guidelines. If possible, allow adequate length of tubing such
that the coil may be removed (for inspection or cleaning
services) from the cabinet without disconnecting the tubing.
5.4 Clearances
The unit clearance from a combustible surface may be
0”. However, service clearance must take precedence. A
minimum of 24” in front of the unit for service clearance
is required. Additional clearance on one side or top will
be required for electrical wiring connections. Consult all
appropriate regulatory codes prior to determining nal
clearances. When installing this unit in an area that may
become wet (such as crawl spaces), elevate the unit with a
sturdy, non-porous material. In installations that may lead
to physical damage (i.e. a garage) it is advised to install a
protective barrier to prevent such damage. Always install
units such that a positive slope in condensate line (1/4” per
foot) is allowed.
5.5 Horizontal Applications
If installed above a nished living space, a secondary
drain pan (as required by many building codes), must be
installed under the entire unit and its condensate drain line
must be routed to a location such that the user will see the
condensate discharge.
6 Installation Location
NOTE: These air handlers are designed for indoor
installation only at a max altitude of 10,500 feet above
sea level or a min altitude of -184 feet below sea level.
If the unit is located in an unconditioned area with high
ambient temperature and/or high humidity, the air handler
may be subject to nuisance sweating of the casing. On
these installations, a wrap of 2” berglass insulation
with a vapor barrier is recommended. A secondary drain
pan below the unit is also recommended to protect the
installation site.
This product line may be installed in one of the upow,
downow, horizontal left or horizontal right orientations as
shown in Figures 2, 3, 4 and 5. The unit may be installed
in upow or horizontal left orientation as shipped (refer to
specic sections for more information).
For Upflow and Downflow Installations Only
Side Drain Pan and Extension Removal: Refer to Figure
1, remove the two (2) screws that secure the drip shield
support brackets to the condensate collectors (front and
back). Unsnap the side drain pan from the bottom drain
pan using a screw driver or any small lever. The side drain
pan, drip shield brackets and the drain pan extension may
now be removed. From Figure 1, drain port labeled (A) is
the primary drain for this application and condensate drain
line must be attached to this drain port. Drain port (a) is for
the secondary drain line (if used). If the side drain pan is
removed, the drain port opening in the access panel must
be covered by the accessory drain port plug (DPK1) as
shown in gure 1.1.
SIDE DRAIN PAN
DPK1 DRAIN PLUG
COIL ACCESS PANEL
MAIN DRAIN PAN
Drain Pan
Figure 1.1
5
Kit Number Application
DPK1 All Models
Side Drain Port Plug
Description
Drain Port Plug
DRAIN PORT PLUG KIT
Table 1
Side Drain Pan Removal
Figure 2
6.1 Upflow Installation
No eld modications are mandatory, but to obtain
maximum eciency, the horizontal drip shield, side
drain pan and drain pan extension can be removed.
See previous “Side Drain Pan and Extension Removal”
instructions.
6.2 Horizontal Left Installation
No eld modications are permissible for this application.
Install unit as shown in Figure 4.
Drain port labeled (B) in Figure 1 is the primary drain for
this application and condensate drain line must be attached
to this drain port. Drain port (b) is for the secondary drain
line (if used).
Remove red plugs from side drain pan before connecting
condensate drain pipes. Use removed plug to close
drain ports on vertical drain pan. The bottom right drain
connection in side drain pan is the primary drain for this
application and condensate drain line must be attached to
this drain connection. The bottom left drain connection in
side drain pan is for the secondary drain line (if used).
6.3 Horizontal Right Installation / Downflow
Installation
NOTE: For AMST24BU1400** only: If installing a lter,
an external lter must be used when installing the
unit in Horizontal Right, or if the side drain pan is not
removed for Down Flow application. A lter will not t
on the internal lter rails in these applications.
Side drain pan extension must be removed in the downow
and horizontal right applications for all models.
Refer to Figure 6 and 7 for the location of the components
referenced in the following steps.
1. Before inverting the air handler, remove blower access
panel and coil access panel. The coil access panel and
tubing panel may remain screwed together during this
procedure. Remove and retain the seven (7) screws
securing the coil access panel to the cabinet and the
six (6) screws securing the blower access panel to the
cabinet.
2. Slide the coil assembly out from the cabinet. Use the
drain pan to pull the assembly from the cabinet.
NOTE: Do not use manifolds, copper lines, or the
owrator to pull the coil assembly out. Failure to do so
may result in braze joint damage and leaks.
3. Removal of the center support is required on units
with 21” wide cabinet. Remove and retain the two (2)
screws that secure the center support to the cabinet.
Remove the center support.
4. Position the unit in the downow position.
5. Using the drain pan to hold the coil assembly, slide the
coil assembly back into the cabinet on the downow
brackets as shown in Figure 8.
6. Reinstall the center support (if removed) using the two
(2) screws removed in Step 5.
7. Reinstall the coil access panels and reinstall blower
access panel removed in Step 1 as shown in Figure 9.
8. Drain Connections for Horizontal Right Installation
a. The bottom right drain connection in side drain
pan is the primary drain for this application
and condensate drain line must be attached
to this drain connection. The bottom left drain
connection is for the secondary drain line (if
used).
b. Remove red plugs from side drain pan before
connecting condensate drain pipes. Use removed
plug to close drain ports on vertical drain pan.
9. Drain Connections for Downow Installation
a. The bottom left drain connection in the vertical
drain pan is the primary drain for this application
and condensate drain line must be attached to
this drain connection. The bottom right drain
connection is for the secondary drain line (if
used).
b. Remove red plugs from vertical drain pan before
connecting condensate drain pipes.
6
NOTE: If removing only the coil access panel from
the unit, the lter access panel must be removed rst.
Failure to do so will result in panel damage.
6.4 Humid Environment Installations
NOTE: Each service kit mentioned in this instruction
is available through your local distributor. The kits are
not supplied with the air handler and must be used
to assist with condensation management in humid
environment applications. The individual installation
instructions provided with each kit must be followed.
6.4.1 ALL INSTALLATIONS – HUMID ENVIRONMENTS
Installations in areas where the return air environment
sees humidity levels above 65% relative humidity, a High
Humidity Kit (HHK) must be used. See Table 2 for Model
and Kit assignment.
HHK0004 HHK0005 HHK0006 HHK0007 HHK0008
AMST24B
AMST30B
AMST36B
AMST36C
AMST42C
AMST48C
AMST48C
AMST48D
AMST60D
Table 2
6.4.1.2 Downflow Installations – Humid
Environments
The Side Drain Pan must be removed when the unit is
installed in downow application in humid environments. To
prevent the coil pan “sweating”, the mandatory Downow
Kit (DFK) must also be used in addition to the High
Humidity Kit (HHK). See Table 3 for the correct DFK for
each model.
DFKE-02 DFKE-03
AMST24B
AMST30B
AMST36B
AMST36C
AMST42C
AMST48C
AMST48D
AMST60D
Table 3
6.4.1.3 Horizontal Installations – Humid
Environments
In addition to the High Humidity Kit (HHK), in applications
where the air handler is installed in the horizontal position
(Left or Right), and the return air environment sees
humidity levels above 65% relative humidity, a Condensate
Management Kit (CMK) must be used for eld application.
Applicable Kit and Model listing can be found in Table 4.
CMK0018 CMK0019 CMK0020
AMST24B
AMST36C
AMST30B
AMST36B
AMST42C
AMST48C
AMST48D
AMST60D
Table 4
UPFLOW
Figure 3
DOWNFLOW
Figure 4
7
HORIZONTAL LEFT
Figure 5
HORIZONTAL RIGHT
Figure 6
7 Refrigerant Lines
WARNING
THIS PRODUCT IS FACTORY-SHIPPED WITH R410A AND DRY
NITROGEN MIXTURE GAS UNDER PRESSURE. USE APPRO-
PRIATE SERVICE TOOLS AND FOLLOW THESE INSTRUCTIONS
TO PREVENT INJURY.
NOTE: Refrigerant tubing must be routed to allow
adequate access for servicing and maintenance of the unit.
Do not install the air handler in a location that violates
the instructions provided with the condenser. If the unit
is located in an unconditioned area with high ambient
temperature and/or high humidity, the air handler may be
subject to nuisance sweating of the air handler cabinet. On
these installations, a wrap of 2” berglass insulation with a
vapor barrier is recommended.
7.1 Tubing Size
For the correct tubing size, follow the specication for the
condenser/heat pump.
7.2 Tubing Preparation
All cut ends are to be round, burr free, and clean. Failure
to follow this practice increases the chances for refrigerant
leaks. The suction line is spun closed and requires tubing
cutters to remove the closed end.
NOTE: To prevent possible damage to the tubing joints,
do not handle coil assembly with manifold or owrator
tubes. Always use clean gloves when handling coil
assemblies.
NOTE: The use of a heat shield is strongly
recommended when brazing to avoid burning the
serial plate or the nish of the unit. Heat trap or
wet rags must be used to protect heat sensitive
components such as service valves and TXV valves
sensing bulb.
WARNING
A QUENCHING CLOTH IS STRONGLY RECOMMENDED TO PRE-
VENT SCORCHING OR MARRING OF THE EQUIPMENT FINISH
WHEN BRAZING CLOSE TO THE PAINTED SURFACES. USE
BRAZING ALLOY OF 5% MINIMUM SILVER CONTENT.
CAUTION
APPLYING TOO MUCH HEAT TO ANY TUBE CAN MELT THE
TUBE. TORCH HEAT REQUIRED TO BRAZE TUBES OF VARI-
OUS SIZES MUST BE PROPORTIONAL TO THE SIZE OF THE
TUBE. SERVICE PERSONNEL MUST USE THE APPROPRIATE
HEAT LEVEL FOR THE SIZE OF THE TUBE BEING BRAZED.
7.3 Tubing Connections
An adjustable TXV with bulb is installed on the vapor tube
from the factory.
1. Remove refrigerant tubing panel or coil (lower) access
panel.
2. Remove access valve tting cap and depress the
valve stem in access tting to release pressure. No
pressure indicates possible leak.
3. Replace the panel.
4. Remove the spin closure on both the liquid and
suction tubes using a tubing cutter.
5. Insert liquid line set into liquid tube expansion and
slide grommet about 18” away from braze joint.
6. Insert suction line set into suction tube expansion and
slide insulation and grommet about 18” away from
braze joint.
7. Braze joints. Quench all brazed joints with water or a
wet rag upon completion of brazing.
8
Upper Tie Plate
Control
Deck
Downflow
Bracket
Center
Support
Filter
Bracket
Filter
Access
Panel
Blower
Access
Panel
Coil
Access
Panel
UV
Knockout
Tubing
Panel
Internal Part Terminology
Figure 7
External Part Terminology
Figure 8
Coil Installation For Downflow
Figure 9
Access Panel Configuration for Downflow or
Horizontal Right
Figure 10
Important Note: Ensure coil slides on the rails along
the groove provided on the drain pan side walls.
Failure to do so will result in improper condensate
drainage.
9
7.4 Thermal Expansion Valve System Adjustment
The following information for the indoor unit should be
veried before attempting to charge system or adjust TXV if
necessary.
1. Total static pressure is .5” WC or less.
2. Airow is correct for installed unit.
3. Airow tables are in the installation manual and Spec
Sheet for Indoor Unit.
4. Complete airow tables and charging information are in
Service Manual RS6200006
5. The outdoor temperature must be 60°F or higher.
6. Set the room thermostat to COOL, fan switch to AUTO
7. Set the temperature control well below room
temperature.
Superheat adjustments should not be made until indoor
ambient conditions have stabilized. This could take up to
24 hours depending on indoor temperature and humidity.
Before checking superheat run the unit in cooling for 10
minutes or until refrigerant pressures stabilize. Use the
following guidelines and methods to check unit operation
and ensure that the refrigerant charge is within limits.
NOTE: Charge two stage units on low stage.
1. Purge gauge lines. Connect service gauge manifold to
base-valve service ports.
2. Temporarily install a thermometer on the liquid line at the
liquid line service valve and 4-6” from the compressor
on the suction line. Ensure the thermometer makes
adequate contact and is insulated for best possible
readings. Use liquid line temperature to determine
subcooling and vapor temperature to determine
superheat.
3. Check subcooling and superheat. The system should
have a subcooling of 8°F +/- 1°F and two-stage
compressor systems should have a Subcooling of 6°F
+/- 1°F. and superheat of 8°F +/- 1°F. If subcooling and
superheat are low, adjust TXV to 8°F +/- 1°F superheat,
then check subcooling.
a. If subcooling is low and superheat is high, add
charge to raise subcooling to 8°F +/- 1°F. Two-stage
compressor systems should have a Subcooling of
6°F +/- 1°F then check superheat.
b. If subcooling and superheat are high, adjust
TXV valve to 8°F +/- 1°F superheat, then check
subcooling.
Superheat Adjustments (Only if necessary)
1. Attach a pipe clamp thermometer near the suction line
service valve at the outdoor unit.
a. Ensure the thermometer makes adequate contact
for the best possible readings.
2. TXV-based systems should have a Superheat value of
8°F +/- 1°F.
3. Adjust Superheat by turning the TXV valve stem
clockwise to increase and counterclockwise to
decrease. Adjustments should be made opening or
closing the valve by no more than ¼ turn at a time.
Allow the system to stabilize 15 to 20 minutes before
making additional adjustments if necessary.
4. After adjustments are complete replace cap on
adjustment stem and tighten 1/6 turn.
5. Remove gauges and check the Schrader ports for leaks
and tighten valve cores if necessary. Install caps nger
tight.
NOTE: In situations where the TXV must be removed
and replaced or re-installed into the system, the TXV
should be hand tightened rst and then apply a half
turn to fully set the TXV. No more than 20 ft-lb torque
should be applied to the joints of the TXV.
SUCTION PRESSURE SATURATED SUCTION
PSIG R-410A
50 1
52 3
54 4
56 6
58 7
60 8
62 10
64 11
66 13
68 14
70 15
72 16
74 17
76 19
78 20
80 21
85 24
90 26
95 29
100 31
110 36
120 41
130 45
140 49
150 53
160 56
170 60
SATURATED SUCTION PRESSURE
TEMPERATURE CHART
Table 5
SUBCOOL FORMULA =
SAT. LIQUID LINE TEMP. - LIQUID LINE TEMP.
SUPERHEAT FORMULA =
SUCT. LINE TEMP. - SAT. SUCT. TEMP.
10
LIQUID PRESSURE
SATURATED LIQUID
TEMPERATURE °F
PSIG R-410A
200 70
210 73
220 76
225 78
235 80
245 83
255 85
265 88
275 90
285 92
295 95
305 97
325 101
355 108
375 112
405 118
415 119
425 121
435 123
445 125
475 130
500 134
525 138
550 142
575 145
600 149
625 152
SATURATED LIQUID PRESSURE
TEMPERATURE CHART
Table 6
8 Condensate Drain Lines
The coil drain pan has a primary and a secondary drain
with 3/4” NPT female connections. The connectors required
are 3/4” NPT male, either PVC or metal pipe, and should
be hand tightened to a torque of no more than 37 in-lbs. to
prevent damage to the drain pan connection. An insertion
depth of approximately 3/8” to 1/2” (3-5 turns) should be
expected at this torque.
1. Ensure drain pan hole is not obstructed.
2. To prevent potential sweating and dripping on to
nished space, it may be necessary to insulate the
condensate drain line located inside the building. Use
Armaex® or similar material.
A secondary condensate drain connection has been
provided for areas where the building codes require it.
Pitch all drain lines a minimum of 1/4” per foot to provide
free drainage. Provide required support to the drain line to
prevent bowing.
If the secondary drain line is required, run the line
separately from the primary drain and end it where
condensate discharge can be easily seen.
NOTE: Water coming from secondary line means the
coil primary drain is plugged and needs immediate
attention.
CAUTION
IF SECONDARY DRAIN IS NOT INSTALLED, THE SECONDARY
ACCESS MUST BE PLUGGED.
Insulate drain lines located inside the building or above
a nished living space to prevent sweating. Install a
condensate trap to ensure proper drainage.
NOTE: When units are installed above ceilings, or
in other locations where damage from condensate
overow may occur, it is MANDATORY to install a eld
fabricated auxiliary drain pan under the coil cabinet
enclosure.
The installation must include a “P” style trap that is located
as close as is practical to the evaporator coil. See Figure
12 for details of a typical condensate line “P” trap.
NOTE: Units operating in high static pressure
applications may require a deeper eld constructed
“P” style trap than is shown in Figure 12 to allow
proper drainage and prevent condensate overow.
Air Handler
2.75" MI
N.
POSITIVE LIQUID
SEAL REQUIRED
AT TRAP
Drain
Connection
2" MIN.
Figure 11
NOTE: Trapped lines are required by many local
codes. In the absence of any prevailing local codes,
please refer to the requirements listed in the Uniform
Mechanical Building Code.
A drain trap in a draw-through application prevents air
from being drawn back through the drain line during fan
operation thus preventing condensate from draining, and
if connected to a sewer line to prevent sewer gases from
being drawn into the airstream during blower operation.
Use of a condensate removal pump is permitted when
necessary. This condensate pump should have provisions
for shutting o the control voltage should a blocked drain
occur. A trap must be installed between the unit and the
condensate pump.
11
IMPORTANT NOTE: The evaporator coil is fabricated
with oils that may dissolve styrofoam and certain types
of plastics. Therefore, a removal pump or oat switch
must not contain any of these materials.
Tip: Priming the “P” trap may avoid improper draining at
the initial installation and at the beginning of the cooling
season.
9 Ductwork
This air handler is designed for a complete supply and
return ductwork system.
CAUTION
DO NOT OPERATE THIS PRODUCT WITHOUT ALL THE
DUCTWORK ATTACHED.
To ensure correct system performance, the ductwork is to
be sized to accommodate 350-450 CFM per ton of cooling
with the static pressure not to exceed 0.5” in w.c. Refer to
ACCA Manual D, Manual S and Manual RS for information
on duct sizing and application. Flame retardant ductwork
is to be used and sealed to the unit in a manner that will
prevent leakage.
NOTE: A downow application with electric heat must
have an L-shaped sheet metal supply duct without any
outlets or registers located directly below the heater.
9.1 Return Ductwork
DO NOT LOCATE THE RETURN DUCTWORK IN
AN AREA THAT CAN INTRODUCE TOXIC, OR
OBJECTIONABLE FUMES/ODORS INTO THE
DUCTWORK. The return ductwork is to be connected to
the air handler bottom (upow conguration).
10 Return Air Filters
NOTE: For AMST24BU1400** only: If installing a lter,
an external lter must be used when installing the
unit in Horizontal Right, or if the side drain pan is not
removed for Down Flow application. A lter will not t
on the internal lter rails in these applications.
Each installation must include a return air lter. This
ltering may be performed at the air handler using the
factory lter rails or externally such as a return air lter
grille. When using the factory lter rails, a nominal
16x20x1”, 20x20x1” or 24x20x1” (actual dimension must be
less than 23-½”x20”) lter can be installed on a B, C and D
cabinet respectively (the cabinet size is the seventh letter
of the model number).
11 Electric Heat
Refer to the installation manual provided with the electric
heat kit for the correct installation procedure. All electric
heat must be eld installed. If installing this option, the
ONLY heat kits that are permitted to be used are the HKS
and HKTSD series. Refer to the air handler unit’s Serial
and Rating plate or the HKS and HKTSD specication
sheets to determine the heat kits compatible with a given
air handler. No other accessory heat kit besides the HKS
and HKTSD series may be installed in these air handlers.
The heating mode temperature rise is dependent upon the
system airow, the supply voltage, and the heat kit size
(kW) selected. Use data provided in Tables 5, 6, AND 7 to
determine the temperature rise (°F).
NOTE: For installations not indicated above the
following formula is to be used:
TR = (kW x 3412) x (Voltage Correction) / (1.08XCFM)
Where: TR = Temperature Rise
kW = Heater Kit Actual kW
3412 = Btu per kW
VC* = .96 (230 Supply Volts)
= .92 (220 Supply Volts)
= .87 (208 Supply Volts)
1.08 = Constant
CFM = Measured Airow
*VC (Voltage Correction)
NOTE: The Temperature Rise Tables can also be
used to estimate the air handler airow delivery.
When using these tables for this purpose set the
room thermostat to maximum heat and allow the
system to reach steady state conditions. Insert two
thermometers, one in the return air and one in the
supply air. The temperature rise is the supply air
temperature minus the room air temperature. Using
the temperature rise calculated, CFM can be estimated
from the TR formula above. See Service Manual for
more information.
3568 10 15 19/20 25
800 12 19 23 31 37
1000 9 15 19 25 30 44
1200 8 12 15 21 25 37 49 62
1400 7 11 13 18 21 32 42 53
1600 6 9 12 15 19 28 37 46
1800 5 8 10 14 16 25 33 41
2000 579 12 15 22 30 37
CFM
HEAT KIT NOMINAL kW
230/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Table 7
12
3568 10 15 19/20 25
800 11 18 22 30 35
1000 9 14 18 24 28 42
1200 7 12 15 20 24 35 47 59
1400 6 10 13 17 20 30 40 51
1600 6 9 11 15 18 27 35 44
1800 5 8 10 13 16 24 31 39
2000 479 12 14 21 28 35
CFM
HEAT KIT NOMINAL kW
220/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Table 8
3568 10 15 19/20 25
800 10 17 21 28 33
1000 8 13 17 22 27 40
1200 7 11 14 19 22 33 45 56
1400 6 10 12 16 19 29 38 48
1600 5 8 10 14 17 25 33 42
1800 579 12 15 22 30 37
2000 478 11 13 20 27 33
CFM
HEAT KIT NOMINAL kW
208/1/60 SUPPLY VOLTAGE - TEMP. RISE °F
Table 9
12 Electrical and Control Wiring
IMPORTANT: All routing of electrical wiring must be
made through provided electrical knockouts. Do not
cut, puncture or alter the cabinet for electrical wiring.
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING
OR INSTALLING THIS UNIT. MULTIPLE POWER
SOURCES MAY BE PRESENT. FAILURE TO DO
SO MAY CAUSE PROPERTY DAMAGE, PERSON-
AL INJURY OR DEATH.
WARNING
HIGH VOLTAGE!
TO AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH
DUE TO ELECTRICAL SHOCK, THIS UNIT MUST HAVE AN UNINTER-
RUPTED, UNBROKEN ELECTRICAL GROUND. THE ELECTRICAL
GROUND CIRCUIT MAY CONSIST OF AN APPROPRIATELY SIZED
ELECTRICAL WIRE CONNECTING THE GROUND LUG IN THE UNIT
CONTROL BOX TO THE BUILDING ELECTRICAL SERVICE PANEL.
OTHER METHODS OF GROUNDING ARE PERMITTED IF PER-
FORMED IN ACCORDANCE WITH THE NATIONAL ELECTRIC CODE
(NEC)/AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)/NA-
TIONAL FIRE PROTECTION ASSOCIATION (NFPA) 70 AND LOCAL/
STATE CODES. IN CANADA, ELECTRICAL GROUNDING IS TO BE IN
ACCORDANCE WITH THE CANADIAN ELECTRIC CODE (CSA) C22.1.
12.1 Building Electrical Service Inspection
This unit is designed for single-phase electrical supply
only. DO NOT OPERATE ON A THREE-PHASE POWER
SUPPLY. Measure the power supply to the unit. The
supply voltage must be measured and be in agreement
with the unit nameplate power requirements and within the
range shown.
12.2 Wire Sizing
Wire size is important to the operation of your equipment.
Use the following check list when selecting the appropriate
wire size for your unit.
• Wire used must carry the Minimum Circuit Ampacity
(MCA) listed on the unit’s Series and Rating Plate.
• Refer to the NEC (USA) or CSA (Canada) for wire
sizing. The unit MCA for the air handler and the
optional electric heat kit can be found on the unit
Series and Rating Plate.
• Wire must be sized to allow no more than a 2%
voltage drop from the building breaker/fuse panel to
the unit.
• Wires with dierent insulation temperature rating
have varying ampacities - be sure to check the
temperature rating used.
Refer to the latest edition of the National Electric Code or in
Canada the Canadian Electric Code when determining the
correct wire size.
12.3 Maximum Overcurrent Protection (MOP)
Every installation must include an NEC (USA) or CEC
(Canada) approved overcurrent protection device. Also,
check with local or state codes for any special regional
requirements.
Protection can be in the form of fusing or HACR style
circuit breakers. The Series and Rating Plate provides the
maximum overcurrent device permissible.
NOTE: Fuses or circuit breakers are to be sized larger
than the equipment MCA but not to exceed the MOP.
13
Nominal
Input
Minimum
Voltage
Maximum
Voltage
208-230 VAC 197 253
Electrical Voltage
Table 11
12.4 Electrical Connections – Supply Voltage
CAUTION
FIRE HAZARD!
TO AVOID THE RISK OF PROPERTY DAMAGE, PERSONAL INJU-
RY OR FIRE, USE ONLY COPPER CONDUCTORS.
IMPORTANT NOTE: USE COPPER CONDUCTORS
ONLY FROM DISCONNECT OR ELECTRICAL PANEL
TO THE AIR HANDLER.
Knockouts are provided on the air handler top panel and
sides of the cabinet to allow for the entry of the supply
voltage conductors, as shown in Figure 13. Separate
knockouts must be used for two circuit heat kits. Unless
Single Point Wiring Kit (SPW-01) is used. If the knockouts
on the cabinet sides are used for electrical conduit, an
adapter ring must be used in order to meet UL1995 safety
requirements. An NEC or CEC approved strain relief is
to be used at this entry point. Some codes/municipalities
require the supply wire to be enclosed in conduit. Consult
your local codes.
Side of
Cabinet
Top of
Cabinet
KNOCK-OUT FOR ELECTRICAL CONNECTIONS
Figure 12
Minimum CFM Required for Heater Kits
Table 10
3 5 6 8 10 15 19 20 25
AMST24BU14 715 715 715 715 850
AMST30BU14 715 715 715 715 875 1050
AMST36BU14 715 715 715 715 875 1050
AMST36CU14 1170 1170 1170 1170 1345 1345
AMST42CU14 1170 1170 1170 1170 1345 1345
AMST48CU14 1170 1170 1170 1170 1345 1345
AMST48DU14 1240 1240 1240 1240 1520 1520
AMST60DU14 1590 1590 1590 1590 1715 1715 1930
Model
HEATER KIT (kW)
*Airflows shown are to be considered the absolute minimum allowable for the Air handler and Heat kit
combination. The minimum airflow does not represent the recommended airflow by the manufacturer. When
selecting a heater kit, the Minimum Blower Setting (M.B.S.) or speed tap listed on the unit’s nameplate
should be followed.
14
12.4.1 Air Handler Only (Non-Heat Kit Models)
IMPORTANT: Installation of Air Handler must follow any
local codes/regulations. The manufacture recommends
that when a heater kit is not installed, a eld supplied
disconnect switch or breaker should be installed in the
electrical circuit that will allow power to be shut-o for
service or maintenance.
The building supply connects to the stripped black and red
wires contained in the air handler electrical compartment
cavity. A ground screw is also contained in this area.
Attach the Supply wires to the air handler conductors as
shown in the unit wiring diagram using appropriately sized
solderless connectors or other NEC or CEC approved
means.
12.4.2 Air Handler - Non-Circuit Breaker Heat Kits
A terminal block is provided with the HKS and HKTSD kit
to attach the power supply and air handler connections.
Follow the HKS and HKTSD Installation Manual and wiring
diagram for complete wiring details.
12.4.3 Air Handler With Circuit Breaker Heat Kit
The air handler has soft plastic cover on the upper access
panel and can be removed to allow the heater kit circuit
breaker to be installed. The circuit breakers have lugs
for power supply connection. See the HKS and HKTSD
Installation Instructions for further details.
12.5 Low Voltage Connections
Several combinations of low voltage schemes are possible,
depending on the presence of a heat kit and whether the
heat kit is single-stage or multi-stage, whether the outdoor
section is an air conditioner or heat pump, and whether
the outdoor section is single-stage or two-stage. The
24V-control voltage connects the air handler to the room
thermostat and condenser. Low voltage wiring must be
copper conductors. A minimum of 18AWG must be used
for installations up to 100 feet. Low voltage wiring must
be connected through the top of the cabinet or either side.
See the “Thermostat Wiring” section of this manual for
typical low voltage wiring connections.
12.5.1 Thermostats
Second-stage heat can be accomplished by a multi-stage
heating thermostat or the addition of an outdoor thermostat
as shown in wiring schematics on page 19. Follow the
thermostat manufacturer’s instructions for installation.
12.6 Speed Tap Adjustment
AMST**U1400** air handlers feature 9-speed energy
ecient blower motors. The motors run at a constant
torque with very low power consumption. Changing the 24
VAC leads to the desired speed tap on the terminal block
will adjust provided CFM (speed tap adjustment of the
AMST60DU1400** is not supported).
The AMST blower motor speeds are programmed to deliver
adequate airow at rated external static pressure and
with a 60 second o time delay. For details, refer to the
specication sheet applicable to your model.
12.6.1 Selecting Speed Taps 1-5 (Not applicable to
AMST60DU1400**)
When selecting Speed Taps 1-5, move the Purple (PU)
wire lead from the alternate control relay to the desired
Speed Tap (Note: The labeled terminal block (TB) locations
T1-T5 correlate to Speed Taps 1-5). See Table 12.
NOTE: When selecting Speeds Tap 1 or 5, the Black
(BK) jumper should be removed completely and placed
in the Literature Bag.
OR WH BR PU YL
T1 T2 T3 T4 T5 TB Engaged
Tap-1 PU T1
Tap-2 PU T2
Tap-3 PU T3
Tap-4 PU T4
Tap-5 PU T5
Table 12
Speed Taps 1-5 Wiring
Figure 13
15
12.6.2 Selecting Speed Taps 6-9 (Not applicable to
AMST60DU1400**)
When selecting speed taps 6-9, move the Black (BK)
jumper, jumping T1 to any of terminal block locations T2 -
T5. This will shift the motor to the 6-9 taps when the Purple
(PU) lead from the blower relay is placed on the same tap
as the Black (BK) jumper. See Table 13.
OR WH BR PU YL
T1 T2 T3 T4 T5 TB Engaged
Tap-6 BK PU+BK T1+ T2
Tap-7 BK PU+BK T1+T3
Tap-8 BK PU+BK T1+ T4
Tap-9 BK PU+BK T1+ T5
Table 13
Speed Taps 6-9 Wiring
Figure 14
12.6.3 AMST60DU1400** (ONLY)
For high static applications, no speed tap or airow
modications should be made from the factory settings. To
obtain T1 airow for low static applications, the Purple (PU)
jumper between Y1 and T3 should be removed. See Table
14.
High Static Applications Wiring
Figure 15
Low Static Applications Wiring
Figure 16
Table 14
R BL OR WH BR PU YL
R C G W1 W2 Y1 Y2 O DH T1 T2 T3 T4 T5
High Static Applications
GR WH BR PU YL GR WH PU BR YL
Low Static Applications GR WH BR YL GR WH BR YL
16
13 Achieving 1.4% Low Leakage Rate
Ensure all the gaskets remain intact on all surfaces as
shipped with the unit. These surfaces are areas between
the upper tie plate and blower access panel, blower access
and coil access panels, and between the coil access and
lter access panels. Ensure upon installation, that the
plastic breaker cover is sitting ush on the blower access
panel and all access panels are ush with each other and
the cabinet. With these requirements satised, the unit
achieves less than 1.4% airow leakage when tested in
accordance with ASHRAE Standard 193.
14 Start-Up Procedure
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING
OR INSTALLING THIS UNIT. MULTIPLE POWER
SOURCES MAY BE PRESENT. FAILURE TO DO
SO MAY CAUSE PROPERTY DAMAGE, PERSON-
AL INJURY OR DEATH.
• Prior to start-up, ensure that all electrical wires are
properly sized and all connections are properly
tightened.
• All panels must be in place and secured. For Air
Tight application, gasket must be positioned at
prescribed locations to achieve 1.4% leakage.
• Tubing must be leak free.
• Condensate line must be trapped and pitched to
allow for drainage.
• Low voltage wiring is properly connected.
• Auxiliary drain is installed when necessary and
pitched to allow for drainage.
• Unit is protected from vehicular or other physical
damage.
• Return air is not obtained from, nor are there any
return air duct joints that are unsealed in, areas
where there may be objectionable odors, ammable
vapors or products of combustion such as carbon
monoxide (CO), which may cause serious personal
injury or death.
15 Regular Maintenance
The only item required to be maintained on a regular basis
by the user is the circulating air lter(s). Filter should be
cleaned or replaced regularly, typically once per month. A
certied service technician must perform all other services.
IMPORTANT NOTE: If thumb screws are used to access
the lter, ensure the washer installed on the screw behind
the access panel remains in place after re-installation.
17
16 Airow Data
Speed
Tap
0.1
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
T1 720
690 625 605 525 505 385 370 265
T2
850 825 770
750 675 665
590
575 470
T3 900 875
830 815 750 740 670 655
550
T4 1030 1005 960
950 900 890 825 820
760
T5 825
800
745 730
660 645 560 550 460
T6 935 910 865 850 790 780 715 705 620
T7
1100 1080
1035 1020 970 960 905 900 840
T8 1045
1025 985
970 920 910 850 845
785
T9 1215 1195
1155 1145 1105
1095 1045
1040 980
T1
750 725 670
655 585 570 465 455 360
T2 920
895 845 830
780 770 710 700 615
T3
985 960 915 900 850
840
785 775
710
T4
1185 1165 1125 1115 1070 1060 1015 1010 960
T5 1070 1050 1005
995
945 935 890 885 830
T6 620
585
515 485
375 310 260 245 145
T7 840
815
760 745 685 670
590 580
480
T8
855 830 780 765 705 695 625 615 515
T9
995 970 925
910 860
850 800
790 730
T1
750 725 670 655 585 570 465 455 360
T2
920 895 845 830 780 770 710 700 615
T3 985 960 915 900 850
840 785 775
710
T4
1185 1165 1125
1115 1070
1060 1015
1010 960
T5 1070 1050
1005 995 945
935 890
885 830
T6 620 585 515 485 375 310 260
245 145
T7 840 815 760
745 685
670 590 580 480
T8 855 830 780
765 705 695 625 615 515
T9
995 970 925
910 860 850 800 790
730
T1 1120
1085 1020 1000 910 890 770 760 680
T2 1285 1255 1190 1170 1100 1085 990
980 885
T3 1430 1400 1345 1330 1260 1250 1175 1165 1065
T4
1735 1710 1660 1645 1580 1570
1510 1500 1440
T5 1830 1805 1755 1740 1685 1675 1605 1595 1525
T6 1165 1130 1055 1035
960 940 825 815 715
T7 1450 1425
1370
1355
1285 1275 1200
1190 1095
T8 1070 1035 960 935 830 810 700 690 610
T9 1560
1530 1470 1455 1390 1380 1310 1300 1235
AMST36CU1400AA
Model
CFM @ STATIC PRESSURE (IN W.C.)
AMST24BU1400AA
AMST30BU1400AA
AMST36BU1400AA
18
ASMT Airflow Data (CFM)
Table 15
NOTE:
1. Airow data indicated is at 230V without air lter in place.
2. The chart is for information only. For satisfactory operation, external static pressure must not exceed value shown on
rating plate.
3. Use the CFM adjustment factors of 0.98 for horizontal left and 0.96 for horizontal right & downow orientations.
4. (AMST60DU1400** ONLY) Refer to section ‘12.6 Speed Tap Adjustment’ to obtain T1 airow for low static
applications.
Speed
Tap
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
T1 1165 1140
1085
1065 990 975 895 880 765
T2 1210 1185 1130 1110 1040 1025 950 935 830
T3 1215 1190 1135 1120 1055 1040 960 945 835
T4 1495 1470 1425 1415 1365 1355 1305 1295 1220
T5 1435 1410 1360 1345 1295 1285 1220 1210 1140
T6 1410 1385 1335 1325 1280 1270 1195 1185 1115
T7 1440 1415 1365 1355 1305 1295 1235 1225 1155
T8 1230 1205 1150 1135 1070 1060 990 975 850
T9 1495 1470 1425 1415 1365 1355 1305 1295 1220
T1 1420 1390 1330 1310 1235 1220 1135 1125 1050
T2 1580 1550 1490 1470 1400 1390 1315 1305 1230
T3 1635 1610 1560 1545 1480 1470 1400 1390 1315
T4 1735 1710 1660 1640 1560 1550 1485 1475 1410
T5 1820 1795 1750 1735 1680 1670 1605 1595 1525
T6 1465 1435 1375 1355 1280 1265 1165 1155 1065
T7 1725 1700 1650 1635 1570 1560 1495 1485 1420
T8 1755 1730 1680 1665 1595 1585 1515 1505 1425
T9 1325 1295 1230 1210 1130 1115 1025 1015 930
T1 1425 1395 1335 1320 1250 1240 1165 1155 1070
T2 1510 1480 1425 1410 1345 1335 1270 1260 1185
T3 1605 1580 1525 1510 1450 1440 1375 1365 1300
T4 1875 1855 1810 1795 1735 1725 1670 1665 1605
T5 1755 1730 1680 1665 1605 1595 1535 1525 1465
T6 1350 1320 1260 1245 1175 1160 1085 1075 980
T7 1140 1105 1040 1020 935 915 805 790 685
T8 1605 1580 1525 1510 1450 1440 1375 1365 1300
T9 1605 1580 1525 1510 1450 1440 1375 1365 1300
T1 1215 1175 1095 1070 975 950 790 780 700
T6 1815 1785 1725 1710 1650 1640 1570 1560 1490
T7 1360 1325 1250 1230 1145 1125 1010 990 850
T8 2070 2045 1995 1980 1930 1920 1855 1845 1785
T9 1970 1945 1895 1880 1815 1805 1740 1730 1660
AMST60DU1400AA
Model
CFM @ STATIC PRESSURE (IN W.C.)
AMST42CU1400AA
AMST48CU1400AA
AMST48DU1400AA
19
17 Air Handler Low Voltage Connections
The following composite wiring diagrams detail various
congurations in which the air handlers can be used.
Examples include single-stage cooling and heat pump
with single or two-stage electric heating. All these
congurations can be applied with convenient connections
to outdoor thermostat applications.
The following sections are detailed:
• Single-Stage Cooling
• Heat Pump
Each diagram details the connections between room
thermostat and the air handlers, and the connections
between the air handlers and the Condensing Unit (or Heat
Pump) with optional connections to Outdoor Thermostats.
For each conguration, refer to the explanation of the
proper jumper(s) to remove for the corresponding blower
speed that will result in the programmed xed speed ECM
motor.
IMPORTANT: When matching the AMST air handlers to
a single speed cooling or heat pump unit, remember to
connect “Y” from the thermostat to the “Y2” on the low
voltage terminal board.
Any equivalent thermostat can be used in place of the
manufacturer’s thermostat part number.
20
18 Wiring Diagrams
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING.
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO
MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
WARNING
NOTES:
1) OUTDOOR THERMOSTAT (OT-1) SHOULD BE THE FIRST
TO CLOSE AND THE LAST TO OPEN.
2) JUMPER W1 AND W2 TOGETHER IF OT-2 IS NOT USED.
3) REMOVE WIRE WHEN USING OUTDOOR THERMOSTAT.
NOMENCLATURE:
OT - OUTDOOR THERMOSTAT (OPTIONAL)
EHR - EMERGENCY HEAT RELAY (OPTIONAL)
COLOR CODES
RD - RED
YL - YELLOW
BL - BLUE
BR - BROWN
OR - ORANGE
WH - WHITE
COOLING UNIT WITH OPTIONAL HEAT KITS OF 10 kW AND BELOW
G R
C
W1
YW
W2
Y2
Y1
O
G
R
TB
YL
BL
TO CONDENSING UNIT
24V CONNECTION
BL
YL
YL
WH
GR
RD
#18 GA. 4 WIRES WITH COOLING
3 WIRES WITHOUT
AIR HANDLER
Y GW
W2
R
COOLING UNIT WITH OPTIONAL HEAT KITS OF 15 kW AND ABOVE
AND ROOM THERMOSTAT WITH TWO STAGES OF HEAT
C
W1
W2
Y2
Y1
O
G
R
TB
YL
BL
CONDENSING UNIT
24V CONNECTION
BL
YL
GR
RD
#18 GA. 5 WIRES WITH COOLING
4 WIRES WITHOUT
WH
YL
BR
BR
BR
YL
AIR HANDLER
SEE NOTE #3
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
21
NOTES:
1) OUTDOOR THERMOSTAT (OT-1) SHOULD BE THE FIRST
TO CLOSE AND THE LAST TO OPEN.
2) JUMPER W1 AND W2 TOGETHER IF OT-2 IS NOT USED.
3) REMOVE WIRE WHEN USING OUTDOOR THERMOSTAT.
4) E TERMINAL MAY NOT BE APPLICABLE FOR SOME
THERMOSTATS
NOMENCLATURE:
OT - OUTDOOR THERMOSTAT (OPTIONAL)
EHR - EMERGENCY HEAT RELAY (OPTIONAL)
COLOR CODES
RD - RED
YL - YELLOW
BL - BLUE
BR - BROWN
OR - ORANGE
WH - WHITE
GC R
HEAT PUMP UNIT WITH OPTIONAL HEAT KITS OF 10 kW AND BELOW
C
W1
W2
Y2
Y1
O
G
R
TB
#18 GA. 7 WIRE
O
YC
W2
R Y O
W2
E
RD
BR
GR
BR
BL
WH
OR
YL
YL
YL
YL
RD
BL
WH
WH
OR
BL
BL
WH
AIR HANDLER
GC R
HEAT PUMP UNIT WITH OPTIONAL HEAT KITS OF 15 kW AND ABOVE
C
W1
W2
Y2
Y1
O
G
R
TB
O
YC
W2
R Y O
W2
E
RD
GR
BL
OR
YL
YL
BL
OR
WH
BR
WH
BL
WH
WH
RD
BR
RD
WH
GR
YL
OR
OR
RD
OR
AIR HANDLER
SEE NOTE #4
#18 GA. 7 WIRE
SEE NOTE #4
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING.
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO
MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
WARNING
22
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING.
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO
MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
WARNING
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
COPPER POWER SUPPLY
(USE RATING PLATE)
USE MIN. 75° C FIELD WIRE
0140A00761-A
PLM
PLF
TR
FACTORY WIRING
FIELD WIRING
NOTES
:
1. RED WIRES TO BE ON TRANSFORMER TERMINAL "3" FOR 240 VOLTS AND ON
TERMINAL "2" FOR 208 VOLTS.
2. SEE COMPLETE W IRING DIAGRAMS IN INSTALLATION INSTRUCTIONS FOR
PROPER LOW VOLTAGE WIRING CONNECTIONS.
3. "CONFIRM SPEED TAP SELECTION IS APPROPRIATE FOR APPLICATION. IF
SPEED TAP NEEDS TO BE CHANGED, CONNECT PURPLE WIRE FROM TERMINAL7
OF CR (TERMINAL 4 OF ALTERNATE) RELAY TO APPROPRIATE TAP AT TB”
4. BROWN AND WHITE WIRES ARE USED FOR HEAT KITS ONLY.
5. FUSE: 3A, 250V, 3AG ATO STYLE FUSE. OPTIONAL FUSE 3 AMP CARTRIDGE.
6. LOW VOLTAGE FIELD WIRING TO BE N.E.C CLASS 2 WIRES.
RELAY
EVAPORATOR MOTOR
TERMINAL BOARD
R
EM
TB
BK
RD
BL
YL
BLUE
BLACK
RED
YELLOW
COMPONENT CODE
BROWN
PURPLE
GREEN
PU
BR
GR
FEMALE PLUG CONNECTOR
MALE PLUG CONNECTOR
TRANSFORMER
HIGH VOLTAGE
LOW VOLTAGE
HIGH VOLTAGE
LOW VOLTAGE
PLF
2
COLOR CODE
TR
6
5
PLM
4
4
24V
5
1
23
EM
WIRING COD
E
208/240 VOLTS
1
1
PLF
PLM
L1
PLM
2
L2
IF REPLACEMENT OF THE ORIGINAL WIRES
SUPPLIED WITH THIS ASSEMBLY IS NECESSARY,
USE WIRE THAT CONFORMS TO THE NATIONAL
ELECTRIC CODE.
FL
FUSE LINK
TL
THERMAL LIMIT
CR
CONTROL RELAY
WHITEWH
LG
N
W2R W1C G 4Y1 OY2 1DH 32 5
A
B
1
C
EM
2
4
3
5
4
7
CR
1
SEE NOTE 1
U
S
E
C
O
P
P
E
R
W
IR
E
E
Q
U
I
P
M
E
N
T
G
R
O
U
N
D
B
L
E
M
Y
L
B
L
5
B
K
C
B
K
P
L
F
B
K
1
R
D
2
3
2
4
0
2
4
V
4
1
2
3
T
R
R
D
B
L
B
R
4
5
W
H
6
7
8
9
P
L
M
G
R
D
1
2
3
4
5
6
7
8
9
A
B
1
7
4
C
R
S
E
E
N
O
T
E
S
2
&
6
2
1
4
3
5
N
C
G
L
R
D
P
U
B
L
B
R
W
H
B
L
R
D
G
R
R
D
o
r
B
K
B
L
R
D
B
K
R
D
W
2
R
W
1
C
G
4
Y
1
O
Y
2
1
D
H
3
2
5
R
D
o
r
B
K
P
U
B
R
W
H
O
R
W
H
W
H
B
L
G
R
R
D
o
r
B
K
B
L
L
2
L
1
SEE
NOTE 1
SEE
NOTE 4
1
3
5
4
2
ALTERNATE CONTROL RELAY
B
L
P
U
R
D
G
R
W
H
B
L
1
3
2
4
CR
5
ALTERNATE HEAT RELAY
GRND
GROUND
S
E
E
N
O
T
E
S
2
&
6
F
U
S
E
F
U
S
E
TB
TB
B
K
AMST**U1400** (1.5T - 4T)
23
COPPER POW ER SUPPLY
(USE RATING PLATE)
USE MIN. 75° C FIELD WIRE
0140A00756-A
PLM
PLF
TR
FACTORY WIRING
FIELD WIRING
NOTES
:
1. RED WIRES TO BE ON TRANSFORMER TERMINAL "3" FOR 240 VOLTS AND ON
TERMINAL "2" FOR 208 VOLTS.
2. SEE COMPLETE WIRING DIAGRAMS IN INSTALLATION INSTRUCTIONS FOR
PROPER LOW VOLTAGE WIRING CONNECTIONS.
3. "CONFIRM SPEED TAP SELECTION IS APPROPRIATE FOR APPLICATION. IF
SPEED TAP NEEDS TO BE CHANGED, CONNECT PURPLE WIRE FROM TERMINAL7
OF CR (TERMINAL 4 OF ALTERNATE) RELAY TO APPROPRIATE TAP AT TB”
4. BROWN AND WHITE WIRES ARE USED FOR HEAT KITS ONLY.
5. FUSE: 3A, 250V, 3AG ATO STYLE FUSE. OPTIONAL FUSE 3 AMP CARTRIDGE.
6. LOW VOLTAGE FIELD WIRING TO BE N.E.C CLASS 2 W IRES.
RELAY
EVAPORATOR MOTOR
TERMINAL BOARD
R
EM
TB
BK
RD
BL
YL
BLUE
BLACK
RED
YELLOW
COMPONENT CODE
BROWN
PURPLE
GREEN
PU
BR
GR
FEMALE PLUG CONNECTOR
MALE PLUG CONNECTOR
TRANSFORMER
HIGH VOLTAGE
LOW VOLTAGE
HIGH VOLTAGE
LOW VOLTAGE
PLF
2
COLOR CODE
TR
6
5
PLM
4
4
24V
5
1
23
EM
WIRING COD
E
208/240 VOLTS
1
1
PLF
PLM
L1
PLM
2
L2
IF REPLACEMENT OF THE ORIGINAL W IRES
SUPPLIED WITH THIS ASSEMBLY IS NECESSARY,
USE WIRE THAT CONFORMS TO THE NATIONAL
ELECTRIC CODE.
FL
FUSE LINK
TL
THERMAL LIMIT
CR
CONTROL RELAY
WHITEWH
LG
N
W2R W1C G 4Y1 OY2 1DH 32 5
1
C
EM
2
4
3
5
SEE NOTE 1
U
S
E
C
O
P
P
E
R
W
IR
E
E
Q
U
IP
M
E
N
T
G
R
O
U
N
D
B
L
E
M
Y
L
B
L
5
B
K
C
B
K
P
L
F
B
K
1
R
D
2
3
2
4
0
2
4
V
4
1
2
3
T
R
R
D
B
L
B
R
4
5
W
H
6
7
8
9
P
L
M
G
R
D
1
2
3
4
5
6
7
8
9
2
1
4
3
5
N
C
G
L
R
D
B
L
B
R
W
H
R
D
o
r
B
K
B
L
B
K
R
D
R
D
o
r
B
K
P
U
B
R
W
H
O
R
B
L
R
D
o
r
B
K
B
L
L
2
L
1
SEE
NOTE 1
SEE
NOTE 4
GRND
GROUND
S
E
E
N
O
T
E
S
2
&
6
F
U
S
E
F
U
S
E
TB
SEE NOTES 2 & 6
W2
R
W1
C
G
4
Y1
O
Y2
1
DH
3
2
5
T
B
W
H
B
R
P
U
Y
L
G
R
W
H
B
R
P
U
Y
L
G
R
AMST60DU1400**
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING.
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO
MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
WARNING
24
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING.
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO
MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
WARNING
3-Phase Heat Kit
25
AIR HANDLER
AIR HANDLER HOMEOWNER’S ROUTINE MAINTENANCE RECOMMENDATIONS
Replace or Clean Filter
IMPORTANT NOTE: Never operate unit without a lter
installed as dust and lint will build up on internal parts
resulting in loss of eciency, equipment damage and
possible re.
An indoor air lter must be used with your comfort system.
A properly maintained lter will keep the indoor coil of
your comfort system clean. A dirty coil could cause poor
operation and/or severe equipment damage.
Your air lter or lters could be located in your furnace, in a
blower unit, or in “lter grilles” in your ceiling or walls. The
installer of your air conditioner or heat pump can tell you
where your lter(s) are, and how to clean or replace them.
Check your lter(s) at least once a month. When they are
dirty, replace or clean as required. Disposable type lters
should be replaced. Reusable type lters may be cleaned.
You may want to ask your dealer about high eciency
lters. High eciency lters are available in both electronic
and non-electronic types. These lters can do a better job
of catching small airborne particles.
Motors
Indoor and outdoor fan motors are permanently lubricated
and do not require additional oiling.
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING
OR INSTALLING THIS UNIT. MULTIPLE POWER
SOURCES MAY BE PRESENT. FAILURE TO DO
SO MAY CAUSE PROPERTY DAMAGE, PERSON-
AL INJURY OR DEATH.
ALUMINUM INDOOR COIL CLEANING
(QUALIFIED SERVICER ONLY)
This unit is equipped with an aluminum tube evaporator
coil. The safest way to clean the evaporator coil is to simply
ush the coil with water. This cleaning practice remains as
the recommended cleaning method for both copper tube
and aluminum tube residential evaporator coils.
It has been determined that many coil cleaners and drain
pan tablets contain corrosive chemicals that can be harmful
to aluminum tube and n evaporator coils. Even a one-
time application of these corrosive chemicals can cause
premature aluminum evaporator coil failure. Any cleaners
that contain corrosive chemicals including, but not limited
to, chlorine and hydroxides, should not be used.
An alternate cleaning method is to use one of the products
listed in TP-109* to clean the coils. The cleaners listed
are the only agents deemed safe and approved for use to
clean round tube aluminum coils. TP-109 is also available
on the web site in Partner Link > Service Toolkit.
NOTE: Ensure coils are rinsed well after use of any
chemical cleaners.
CAUTION
TO AVOID THE RISK OF EQUIPMENT DAMAGE OR FIRE, IN-
STALL THE SAME AMPERAGE BREAKER OR FUSE AS YOU
ARE REPLACING. IF THE CIRCUIT BREAKER OR DUSE SHOULD
OPEN AGAIN WITHIN THIRTY DAYS, CONTACT A QUALIFIED
SERVICER TO CORRECT THE PROBLEM.
IF YOU REPEATEDLY RESET THE BREAKER OR REPLACE THE
FUSE WITHOUT HAVING THE PROBLEM CORRECTED, YOU RUN
THE RISK OF SEVERE EQUIPMENT DAMAGE.
BEFORE YOU CALL YOUR SERVICER
• Check the thermostat to conrm that it is properly
set.
• Wait 15 minutes. Some devices in the outdoor
unit or in programmable thermostats will prevent
compressor operation for awhile, and then reset
automatically. Also, some power companies will
install devices which shut o air conditioners for
several minutes on hot days. If you wait several
minutes, the unit may begin operation on its own.
• Check the electrical panel for tripped circuit
breakers or failed fuses. Reset the circuit breakers
or replace fuses as necessary.
• Check the disconnect switch near the indoor
furnace or blower to conrm that it is closed.
• Check for obstructions on the outdoor unit. Conrm
that it has not been covered on the sides or the
top. Remove any obstruction that can be safely
removed. If the unit is covered with dirt or debris,
call a qualied servicer to clean it.
• Check for blockage of the indoor air inlets and
outlets. Conrm that they are open and have not
been blocked by objects (rugs, curtains or furniture).
• Check the lter. If it is dirty, clean or replace it.
• Listen for any unusual noise(s), other than normal
operating noise, that might be coming from the
outdoor unit. If you hear unusual noise(s) coming
from the unit, call a qualied servicer.
26
19 Start-Up Checklist
Air Handler / Coil
ELECTRICAL
Line Voltage (Measure L1 and L2 Voltage) L1 - L2
Secondary Voltage (Measure Transformer Output Voltage) R - C
Blower Amps
Heat Strip 1 - Amps
Heat Strip 2 - Amps
BLOWER EXTERNAL STATIC PRESSURE
Return Air Static Pressure IN. W.C.
Supply Air Static Pressure IN. W.C.
Total External Static Pressure (Ignoring +/- from the reading above, add total here) IN. W.C.
TEMPERATURES
Return Air Temperature (Dry bulb / Wet bulb) DB °F WB °F
DB °F WB °F
Heating Supply Air Temperature DB °F
Temperature Rise DB °F
Delta T (Difference between Supply and Return Temperatures) DB °F
Air Handler / Coil - (Inverter Matched)
INVERTER AH / COIL ONLY
Check EEV and EEV wiring is secure (no adjustment required)
Additional Checks
Check wire routings for any rubbing
Check product for proper draining
Check screw tightness on blower wheel
Check factory wiring and wire connections
Check product for proper clearances as noted by installtion instructions
°F to °C formula: (°F - 32) divided by 1.8 = °C °C to °F formula: (°C multiplied by 1.8) + 32 = °F
Model Number
Serial Number
Cooling Supply Air Temperature (Dry bulb / Wet bulb)
27
THIS PAGE IS INTENTIONALLY LEFT BLANK
28
CUSTOMER FEEDBACK
We are very interested in all product comments.
Please ll out the feedback form on one of the following links:
Daikin Products: (https://daikincomfort.com/contact-us)
Goodman
®
Brand Products: (http://www.goodmanmfg.com/about/contact-us).
Amana
®
Brand Products: (http://www.amana-hac.com/about-us/contact-us).
You can also scan the QR code on the right for the product brand you
purchased to be directed to the feedback page.
DAIKIN
AMANA
®
BRAND
GOODMAN
®
BRAND
PRODUCT REGISTRATION
Thank you for your recent purchase. Though not required to get the
protection of the standard warranty, registering your product is a relatively
short process, and entitles you to additional warranty protection, except that
failure by California and Quebec residents to register their product does not
diminish their warranty rights.
DAIKIN
AMANA
®
BRAND
GOODMAN
®
BRAND
For Product Registration, please register as follows:
Daikin Products: (https://daikincomfort.com/owner-support/product-registration).
Goodman® Brand products: (https://www.goodmanmfg.com/product-registration).
Amana® Brand products: (http://www.amana-hac.com/product-registration).
You can also scan the QR code on the right for the product brand you purchased
to be directed to the Product Registration page.
®
is a registered trademark of Maytag Corporation or its related companies and is used under license.
All rights reserved.
