Heat Controller Air Handler Series Instruction manual

Heat Controller, Inc. • 1900 WellworthAve. • Jackson, MI 49203 • [phone] • www.heatcontroller.com
INSTALLATION, OPERATION
& MAINTENANCE MANUAL
Residential Air Handler
Air Handler Series

2
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Model Nomenclature ............................................................................................3
Pre-Installation......................................................................................................4
Safety ...................................................................................................................5
Physical Data........................................................................................................6
Unit Dimensional Data..........................................................................................7
Installation .......................................................................................................8-13
Electrical - Thermostat Wiring ............................................................................14
ECM Blower Control...........................................................................................15
Blower Performance Data ..................................................................................16
Electrical - Power Wiring ....................................................................................17
Electrical Table ...................................................................................................17
Wiring Diagram...................................................................................................18
Electric Heat Installation.....................................................................................19
Electric Heat Wiring.......................................................................................20-21
Electric Heat Staging Options.............................................................................21
Unit & System Checkout.....................................................................................22
Maintenance.......................................................................................................22
Table of Contents

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
W D 0 2 4G V S B - 1
123
4 5 6
7
891011
W = WATER SOURCEAIR HANDLER
MODEL TYPE
CONFIGURATION
REFRIGERANT
G = R410A
NOMINAL CAPACITY
024
TXV TYPE
S = STANDARD
CONTROLS
CABINET SIZE
WIDTH X HEIGHT (INCHES)
VOLTAGE
036
048
060
UNIT SIZE 024 ONLY ; 18.5 X 44
A
B
CUNIT SIZE 024, 036, 048 ONLY ; 22.5 X 55
UNIT SIZE 036, 048, 060, ONLY; 25.5 X 59
1 = 208-230/1 ( FIELD CONVERTIBLE TO 115V )
D = DIRECT EXPANSION
A
12
A= CURRENT REVISION
REVISION
V = TXV w/ECM DRIVE
Model Nomenclature

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
 WARNING! 
WARNING! These instructions are intended as an aid to
qualified licensed service personnel for proper installation,
adjustment and operation of this unit. Read these instructions
thoroughly before attempting installation or operation. Failure
to follow these instructions may result in improper installation,
adjustment, service or maintenance possibly resulting in
property damage, personal injury or death.
 CAUTION! 
 CAUTION! 
Inspection
Upon receipt of the equipment, carefully check the shipment against
the bill of lading. Make sure all units have been received. Inspect
the packaging of each unit, and inspect each unit for damage.
Insure that the carrier makes proper notation of any shortages or
damage on all copies of the freight bill and completes a common
carrier inspection report. Concealed damage not discovered during
unloading must be reported to the carrier within 15 days of receipt
of shipment. If not filed within 15 days, the freight company can
deny the claim without recourse. Note: It is the responsibility of
the purchaser to file all necessary claims with the carrier. Notify
your equipment supplier of all damage within fifteen (15) days of
shipment.
Storage
Equipment should be stored in its original packaging in a clean,
dry area. Store units in an upright position at all times. Stack
units a maximum of 3 units high.
Unit Protection
Cover units on the job site with either the original packaging or an
equivalent protective covering. Cap the open ends of pipes stored
on the job site. In areas where painting, plastering, and/or spraying
has not been completed, all due precautions must be taken to avoid
physical damage to the units and contamination by foreign material.
Physical damage and contamination may prevent proper start-up
and may result in costly equipment clean-up.
Examine all pipes, fittings, and valves before installing any of the
system components. Remove any dirt or debris found in or on
these components.
Pre-Installation
Installation, Operation, and Maintenance instructions are
provided with each unit. Horizontal equipment is designed for
installation above false ceiling or in a ceiling plenum. Other
unit configurations are typically installed in a mechanical room.
The installation site chosen should include adequate service
clearance around the unit. Before unit start-up, read all manuals
and become familiar with the unit and its operation. Thoroughly
check the system before operation.
Prepare units for installation as follows:
1. Compare the electrical data on the unit nameplate with
ordering and shipping information to verify that the correct
unit has been shipped.
2. Keep the cabinet covered with the original packaging until
installation is complete and all plastering, painting, etc. is
finished.
3. Verify refrigerant tubing is free of kinks or dents and that it
does not touch other unit components.
4. Inspect all electrical connections. Connections must be clean
and tight at the terminals.
CAUTION! DO NOT store or install units in corrosive
environments or in locations subject to temperature or
humidity extremes. Corrosive conditions and high temperature
or humidity can significantly reduce performance, reliability,
and service life.
CAUTION! CUT HAZARD - Failure to follow this caution may
result in personal injury. Sheet metal parts may have sharp
edges or burrs. Use care and wear appropriate protective
clothing, safety glasses and gloves when handling parts and
servicing.
General Information

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
 CAUTION! 
CAUTION! It is recommended that an auxiliary secondary
drain pan be installed under units containing evaporator coils
that are located in any area of a structure where damage to
the building or building contents may occur as a result of an
overflow of the coil drain pan or a stoppage in the primary
condensate drain piping.
The installation of water source heat pump units and all
associated components, parts and accessories which make
up the installation shall be in accordance with the regulations
of ALL authorities having jurisdiction and MUST conform to
all applicable codes. It is the responsibility of the installing
contractor to determine and comply with ALL applicable codes
and regulations.
Replacement Parts
Any replacement part must be the same as or an approved
alternate to the original part supplied. The manufacturer will not
be responsible for replacement parts not designed to physically
fit or operate within the design parameters the original parts were
selected for. When ordering replacement parts, it is necessary to
order by part number and include the complete model number
and serial number from the coil rating plate. (See parts list for unit
component part numbers. Parts are available through the local
distributor.)
 WARNING! 
 WARNING! 
 WARNING! 
 CAUTION! 
Safety
Warnings, cautions and notices appear throughout this manual.
Read these items carefully before attempting any installation,
service, or troubleshooting of the equipment.
DANGER: Indicates an immediate hazardous situation, which if
not avoided will result in death or serious injury. DANGER labels
on unit access panels must be observed.
WARNING: Indicates a potentially hazardous situation, which if not
avoided could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation or an
unsafe practice, which if not avoided could result in minor or
moderate injury or product or property damage.
NOTICE: Notification of installation, operation or maintenance
information, which is important, but which is not hazard-related.
WARNING! All refrigerant discharged from this unit must be
recovered WITHOUT EXCEPTION. Technicians must follow
industry accepted guidelines and all local, state, and federal
statutes for the recovery and disposal of refrigerants. To avoid
leakage of compressor oil, refrigerant lines of the compressor
must be sealed after it is removed.
CAUTION! To avoid equipment damage, DO NOT use these
units as a source of heating or cooling during the construction
process. The mechanical components and filters will quickly
become clogged with construction dirt and debris, which may
cause system damage.
WARNING! The EarthPure® Application and Service Manual
should be read and understood before attempting to service
refrigerant circuits with HFC-410A.
WARNING! To avoid the release of refrigerant into the
atmosphere, the refrigerant circuit of this unit must be serviced
only by technicians who meet local, state, and federal
proficiency requirements.
Safety

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Model Physical Data
Model 026-A 026-B 038-B 038-C 049-B 049-C 064-C
Emerson ECM Fan Motor & Blower in. [cm]
Liquid I.D. 3/8 [0.95] 3/8 [0.95] 3/8 [0.95] 3/8 [0.95] 3/8 [0.95] 3/8 [0.95] 3/8 [0.95]
Suction I.D. 3/4 [1.9] 3/4 [1.9] 7/8 [2.22] 7/8 [2.22] 7/8 [2.22] 7/8 [2.22] 7/8 [2.22]
Fan Motor Type/Speeds ECM Variable
Fan Motor (hp) 1/2 1
Blower Wheel Size (Dia x W)
in. [mm] 9 x 7 [229 x 178] 12 x 10 [305 x 254]
Air Coil Dimensions (H x W)
in. [mm] 3 - 2 Row 14 x 17 [356 x 432] 3 - 2 Row 24 x 17 [610 x 432] 3 - 3 Row 24x17 [610 x 432]
Filter Standard - 1” [25mm]
Throwaway 16 x 20 [406 x 508] 20 x 20 [508 x 508] 20 x 24
[508 x 610] 20 x 20 [508 x 508] 20 x 24 [508 x 610]
Weight - Operating lbs. [kg] 80 [36] 163 [74] 173 [78] 181 [82] 180 [82] 188 [85] 198 [90]
Weight - Packaged lbs. [kg] 96 [44] 179 [81] 198 [90] 206 [93] 218 [99] 226 [103] 236 [107]
024-B 024-C 036-C 036-D 048-C 048-D 060-D
Table 1: Physical Data

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Unit Dimensional Data
0.0 1.6
[4.0]
3.6
[9.1] 5.8
[14.7]
5.9
[15.0]
0.0
3.7 [9.4]
4.5 [11.4]
5.6 [14.2]
6.7 [17.0]
8.5 [21.6]
Detail A
Scale 5/32
[0.4]
C
5.5
[14.0]
See Detail A
A
FD
G
H
E
J
R.A. Opening 0.625
[1.6]
0.625
[1.6] R.A. Opening 0.875
[2.2]
0.75
[1.9]
8.5
[21.6]
3.6
[9.4]
Detail A
A = Primary Drain - Vertical,
Horizontal and Downflow
Configuration
B = Secondary Drain - Vertical
and Downflow Configuration
C = Secondary Drain - Horizontal
Configuration
AB
C
Cabinet
Size
Overall Cabinet 1 2 3 4 5 6
A
Width B Height C Depth D E F G H J
B - Cabinet in. 18.5 44.0 22.0 14.0 14.0 2.3 2.3 4.1 4.1
C - Cabinet in. 22.0 55.0 22.0 18.0 18.0 2.1 2.1 2.1 2.1
D - Cabinet in. 25.5 59.0 22.0 18.0 18.0 3.8 3.8 2.1 2.1

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Installation
Air Handlers are designed for upflow, horizontal, and downflow
applications. The coils have a dry nitrogen holding charge and
are equipped with brazing stub refrigerant connections for easy
installation. Both models come equipped with a factory installed
TXV.
The installer should read the installation manual supplied with
the compressor section for refrigerant line set sizing, connec-
tion procedure, and other important information pertaining to the
system installation.
The installer should:
1. Where precise forming of refrigerant lines is required, a copper
tubing bender is recommended for small diameter tubing. One
should avoid sharp bends and contact of the refrigerant lines
with metal surfaces.
2. Refrigerant lines should be protected where they pass through
the raw edges of holes.
3. Air Handler must be level for proper condensate drainage.
4. Seal the openings into the cabinet to reduce risk of conden-
sate blow off from the coil.
Air Handler Installation
 WARNING! 
WARNING! Electric furnaces may be connected to more than
one supply circuit.
Charging the System
Air Handlers are designed to match HTS split units. For correct
charging, please refer to the Compressor Section IOM.
Upflow Installation
1. Position unit on plenum box or other suitable foundation. Provide
a minimum height for proper unrestricted airflow based on CFM
requirement for each unit size.
2. If a return air duct is connected to the air handler, it must be the
same dimensions as shown in the outline drawing in Figure 2.
3. Plenum box and unit should be isolated from the foundation
using a suitable isolating material.
4. Openings where field wiring enters the cabinet must be
completely sealed. Location of power entry is shown on the
outline drawing.
5. After ductwork connections are made, seal airtight and per local
codes.
Downflow Installation
1. Position unit on plenum box or other suitable foundation. Provide
a minimum height for proper unrestricted airflow based on CFM
requirement for each unit size.
2. If a return air duct is connected to the air handler, it must be the
same dimensions as shown in the outline drawing in Figure 2.
3. Plenum box and unit should be isolated from the foundation
using a suitable isolating material.
4. Openings where field wiring enters the cabinet must be
completely sealed. Location of power entry is shown on the
outline drawing.
5. After ductwork connections are made, seal airtight and per local
codes.
6. The unit is then placed with the blower side down and the coil is
replaced on the coil channel supports with the drain connections
at the bottom. The unit is now in downflow position with front
access.
Position the ECM wire harness connection at the 4 to 8 o’clock
position to prevent condensation from entering motor controller.
7. If a return duct is connected to the air handler, it must be the
same dimensions as the return opening.
8. After ductwork connections are made, seal airtight and per local
codes.
Horizontal Right Installation
For maximum efficiency and customer ease of filter
maintenance, it is recommended that a properly sized remote
filter grille be installed for horizontal applications. Airflow should
not exceed the face velocity of the filter being used. The factory
installed filter should then be removed from the unit.
1. To convert the unit to horizontal right, front access, slide the coil
out on the coil channel supports and rotate the complete coil 180
degrees.
2. The coil is then inserted back into the cabinet on the opposite
side coil channel supports. The unit is now horizontal right with
front access.
Position the ECM wire harness connection at the 4 to 8 o’clock
position to prevent condensation from entering motor controller.
3. If the unit is suspended, it must be supported from the bottom
near both ends as well as the middle to prevent sagging. The
service access must remain unobstructed. If the unit is supported
along the length of the front and back with rails, the air handler
only needs to be suspended at both ends. See Figure 1.
If the unit is not suspended it must be supported as mentioned
above and isolated carefully to prevent sound transmission.
Vibration isolators (purchased locally) must be placed under the
unit.
4. It is always recommended that an auxiliary drain pan be installed
under a horizontal air handler (See Condensate Piping) to prevent
possible damage to ceilings.
5. Isolate the auxiliary drain pan from the unit or from the structure.
6. Connect the auxiliary drain line to a separate drain line (no trap is
needed in this line) and terminate according to national and local
codes.
7. If a return duct is connected to the air handler, it must be the
same dimensions as the return opening shown in the outline
drawing on Figure 2.
8. Openings where field wiring enters the cabinet must be
completely sealed.
9. After ductwork connections are made, seal airtight and per local
codes.
Horizontal Left Installation
1. For maximum efficiency and customer ease of filter
maintenance, it is recommended that a properly sized remote
filter grille be installed for horizontal applications. Airflow should
not exceed the face velocity of the filter being used. The factory
installed filter should then be removed from the unit.
2. Unit is shipped from the factory in the upflow or horizontal
left configuration. Unit conversion is not required. Conversion
is required: Rotate motor to ensure connection at the 4 to 8
o’clock position.

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
3. If the unit is suspended, it must be supported from the bottom
near both ends as well as the middle to prevent sagging.
The service access must remain unobstructed. If the unit is
supported along the length of the front and back, the air handler
only needs to be suspended at both ends. See Figure 1.
4. If the unit is not suspended it must be supported as mentioned
above and isolated carefully to prevent sound transmission.
Vibration isolators (purchased locally) must be placed under the
unit.
5. It is always recommended that an auxiliary drain pan be
installed under a horizontal air handler (See Condensate Drain
Piping) to prevent possible damage to ceilings.
6. Isolate the auxiliary drain pan from the unit or from the structure.
7. Connect the auxiliary drain line to a separate drain line (no trap
is needed in this line) and terminate according to national and
local codes.
8. If a return duct is connected to the air handler, it must be the
same dimensions as the return opening shown in the outline
drawing on Figure 2.
9. Openings where field wiring enters the cabinet must be
completely sealed. Location of power entry is shown on the
outline drawing.
10. After ductwork connections are made, seal airtight and per local
codes.
Duct Connections
The supply and return air ducts should be connected to the unit
with flame retardant duct connectors.
NOTE: No sheetmetal screws may be used to attach
return ductwork on the side.
NOTE: Any duct board return connection can be made
to the sides of the unit using tape or mastic.
Installation
Figure 1: Mounting Installation Options
Tranquility
EarthPure
®
27
Rail
Auxiliary
Drain Pan
Tranquility
EarthPure
®
27
Tranquility
EarthPure
®
27
Tranquility
EarthPure
®
27
Figure 2: Flange Attachment

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Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Applications
Air Handlers can be applied in upflow, downflow, horizontal
right and horizontal left applications without modifications. For
horizontal applications, installation of an auxiliary/secondary
drain pan is required.
 CAUTION! 
CAUTION! For horizontal applications, the horizontal drain pan
must be located under the indoor coil. Failure to place the pan
under the coil can result in property damage.
Installation
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DISCHARGE
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1” to 2” Filter Rack Conversion
The unit is shipped with1” filter rack from the factory. The conversion
process is assumed that the unit is in upflow configuration.
1. Place unit on a flat surface. Remove 2 knurled thumb knobs that
secure the filter rack door at the bottom of the unit.
2. Remove 3 screws that secure the lower filter tracks on each side
of the unit.
3. Lift and rotate the filter tracks upside down and reinstall filter
tracks and screws back.
4. Replace the filter rack door and the 2 knurled thumb knobs.
LEFT
DISCHARGE
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RIGHT
DISCHARGE
BOTTOM
DISCHARGE
5
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11
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
 CAUTION! 
CAUTION! Installation of a factory supplied liquid line bi-
directional filter drier is required. Never install a suction line
filter in the liquid line.
 CAUTION! 
See compressor section IOM for refrigerant charge
information.
Line Set Installation
Figure 4 illustrates a typical installations of an air handler l matched
to an indoor compressor section. Table 1 shows typical line-set
diameters at various lengths. Lineset lengths should be kept to a
minimum and should always be installed with care to avoid kinking.
Line sets over 60 feet [18 meters] long are not recommended due to
potential oil transport problems and excessive pressure drop. If the
line set is kinked or distorted, and it cannot be formed back into its
original shape, the damaged portion of the line should be replaced.
A restricted line set will effect the performance of the system.
All brazing should be performed using nitrogen circulating at
2-3 psi [13.8-20.7 kPa] to prevent oxidation inside the tubing.
All linesets should be insulated with a minimum of 1/2” [13mm]
thick closed cell insulation. All insulation tubing should be
sealed using a UV resistant paint or covering to prevent
deterioration from sunlight.
When passing refrigerant lines through a wall, seal opening
with silicon-based caulk. Avoid direct contact with water
pipes, duct work, floor joists, wall studs, floors or other
structural components that could transmit compressor
vibration. Do not suspend refrigerant tubing from joists
with rigid straps. Do not attach line set to the wall. When
necessary, use hanger straps with isolation sleeves to
minimize transmission of line set vibration to the structure.
Installing the Indoor Coil and Lineset
Figure 3 shows the installation of the lineset and TXV to a typical
indoor coil. Braze the copper line set to the coil. Nitrogen should be
circulated through the system at 2-3 psi [13.8-20.7 kPa] to prevent
oxidation inside the refrigerant tubing. Use a low silver phos-copper
braze alloy on all brazed connections.
Installation
Figure 3: Air Coil Connection TXV (‘IN’ toward
compressor section)
Suction Line
Liquid Line
Bulb (Must be
Installed and
Insulated) Equalizer
Line
TXV has internal
check valve
NOTICE! The air coil should be thoroughly washed with a filming
agent, (dishwasher detergent like Cascade) to help condensate
drainage. Apply a 20 to 1 solution of detergent and water. Spray
both sides of coil, repeat and rinse thoroughly with water. Care
should be taken not to overflow drain pan. Wash after connecting
condensate line.
Sensing Bulb
IMPORTANT: DO NOT perform any brazing with the TXV
bulb attached to any line. After brazing operations have been
completed, clamp the TXV bulb securely on the suction line at
the 10 or 2 o’clock position with the strap provided in the parts
bag. Insulate the TXV sensing bulb and suction line with the
provided pressure sensitive insulation (size 4” x 7”).
IMPORTANT: TXV sensing bulb should be located on a horizontal
section of suction line, just outside of coil box.
IMPORTANT: Always protect TXV from heat when brazing.
IMPORTANT: TXV sensing bulb is shipped unattached. Installer
must attach bulb to suction line after brazing and cooling line for
proper unit operation.
CAUTION! HFC-410A systems operate at higher pressures
than R-22 systems. Be certain that service equipment
(gauges, tools, etc.) is rated for HFC-410A. Some R-22 service
equipment may not be acceptable.
Figure 4: Typical Split/Air Handler Installation
Compressor Section
Low Voltage
Insulated
Linesets
Air pad or Extruded
polystryene
PVC Condensate
with vented trap
Power
Disconnects
Air
Handler
Low
Voltage
Return
Plenum

12
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Evacuation and Charging the Unit
LEAK TESTING - The refrigeration line set must be pressurized
and checked for leaks before evacuating and charging the unit. To
pressurize the line set, attach refrigerant gauges to the service ports
and add an inert gas (nitrogen or dry carbon dioxide) until pressure
reaches 60-90 psig [413-620 kPa]. Never use oxygen or acetylene to
pressure test. Use a good quality bubble solution to detect leaks on all
connections made in the field. Check the service valve ports and stem
for leaks. If a leak is found, repair it and repeat the above steps. For
safety reasons do not pressurize system above 150 psig [1034 kPa].
System is now ready for evacuation and charging.
Condensate Drain Tubing
Consult local codes or ordinances for specific requirements.
IMPORTANT: When making drain fitting connections to the drain
pan, use a thin layer of Teflon paste, silicone or Teflon tape and
install hand tight.
IMPORTANT: When making drain fitting connections to drain
pan, do not overtighten. Overtightening fittings can split pipe
connections on the drain pan.
•Install drain lines so they do not block service access to front
of the unit. Minimum clearance of 24 inches is required for
filter, coil or blower removal and service access.
• Make sure unit is level or pitched slightly toward primary drain
connection so that water will drain completely from the pan
(See Figure 5).
• Do not reduce drain line size less than connection size
provided on condensate drain pan.
• All drain lines must be pitched downward away from the unit a
minimum of 1/8” per foot of line to ensure proper drainage.
• Do not connect condensate drain line to a closed or open
sewer pipe. Run condensate to an open drain or outdoors.
• The drain line should be insulated where necessary to prevent
sweating and damage due to condensate forming on the
outside surface of the line.
• Make provisions for disconnecting and cleaning of the primary
drain line should it become necessary. Install a 3 in. trap in the
primary drain line as close to the unit as possible. Make sure
that the top of the trap is below connection to the drain pan to
allow complete drainage of pan (See Figure 5).
• Auxiliary drain line should be run to a place where it will be
noticeable if it becomes operational. Occupant should be
warned that a problem exists if water should begin running
from the auxiliary drain line.
• Plug the unused drain connection with the plugs provided in
the parts bag, using a thin layer of Teflon paste, silicone or
Teflon tape to form a water tight seal.
• Test condensate drain pan and drain line after installation is
complete. Pour water into drain pan, enough to fill drain trap
and line. Check to make sure drain pan is draining completely,
no leaks are found in drain line fittings, and water is draining
from the termination of the primary drain line.
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Installation
It is always recommended that an auxiliary drain pan be installed
under a horizontally installed air handler.
Connect the auxiliary drain line to a separate drain line (no trap is
needed in this line) and terminate according to local codes.
NOTE: DO NOT use a torch or flame near the plastic
drain pan coupling.
NOTE: DO NOT tighten the drain pipe excessively.
Support the condensate piping and traps outside the
unit to prevent strain on the drain connection.
Figure 5: Condensate Drain Trap

13
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Test Button
The test button puts the AXM into test mode, which bypasses the
soft start ramping profile and the blower immediately ramps up to
the nominal target speed.
FIELD SELECTABLE INPUTS
DIP SWITCHES
Note: In the following field configuration options, DIP switches
should only be moved when power is removed from the DXM2
Control to ensure proper operation.
AXM Control
The WDG Air handler is equipped with a communicating
AXM board to allow communication with the communicating
compressor section (HTS) and communicating thermostat.
The AXM control allows either 4-wire connection with
Communicating DXM2 board and Communicating Thermostat.
It can also be connected to a non-communicating thermostat
and compressor section using up to 9-wires (plus additional if
functionality requires). Please see Thermostat section for more
details.
Low Air Temperature Sensor Installation
WDG Air Handlers are shipped with LT2 (Low Air Temperature)
sensor installed in the Air Handler (Figure 3) and connected to the
AXM control. No additional action required (do not clip the VIO
wires).
Installation
DIP #2: Dehumidification Mode - Provides selection of normal or
Dehumidification Fan Mode. In Dehumidification Mode, the fan
speed will be adjusted for Cooling. In Normal Mode, the fan speed
will be normal during Cooling.
On = Normal Fan Mode. Off = Dehumidification Mode
Rest of the DIP switches are not used.
ACCESSORY CONNECTION / CONFIGURATION
2 Accessory outputs on AXM board only track blower operation.
Other accessories are connected to the DXM2 board. Please refer
to DXM2 AOM for more details.
Fan Connections
Electric Heat
Connections
9-wire connection to non-
communicating thermostat/
compressor section
4-wire connection to
communicating thermostat
4-wire
connection
to DXM2
Accessory
outputs
that track
blower
operation
LT2
Sensor Condensate
Sensor
AXM Connections

14
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Electrical - Thermostat Wiring
 CAUTION! 
 CAUTION! 
CAUTION! Many units are installed with a factory or field
supplied manual or electric shut-off valve. DAMAGE WILL
OCCUR if shut-off valve is closed during unit operation. A
high pressure switch must be installed on the heat pump side
of any field provided shut-off valves and connected to the
heat pump controls in series with the built-in refrigerant circuit
high pressure switch to disable compressor operation if water
pressure exceeds pressure switch setting. The field installed
high pressure switch shall have a cut-out pressure of 300 psig
and a cut-in pressure of 250 psig. This pressure switch can
be ordered from the manufacturer with a 1/4” internal flare
connection as part number 39B0005N02.
CAUTION! Refrigerant pressure activated water regulating
valves should never be used with the manufacturer’s equipment.
Thermostat Installation
The thermostat should be located on an interior wall in a
larger room, away from supply duct drafts. DO NOT locate the
thermostat in areas subject to sunlight, drafts or on external
walls. The wire access hole behind the thermostat may in certain
cases need to be sealed to prevent erroneous temperature
measurement. Position the thermostat back plate against the
wall so that it appears level and so the thermostat wires protrude
through the middle of the back plate. Mark the position of the
back plate mounting holes and drill holes with a 3/16” (5mm) bit.
Install supplied anchors and secure plate to the wall. Thermostat
wire must be 18 AWG wire. Wire the appropriate thermostat as
shown in Figures 6 and 7 to the low voltage terminal strip on
the ECM control board. Practically any heat pump thermostat
will work with these units, provided it has the correct number of
heating and cooling stages.
4-Wire Connection ATC communicating thermostat and DXM2
Communicating control in HTS Splits
AXM control in WDG Air Handler allows 4-wire connection with
Communicating DXM2 board and Communicating Thermostat.
Thermostat Connections
C 24V Common for Control Circuit
R 24V Supply for Control Circuit
A+ Communications (Positive)
B – Communications (Negative)
Thermostat
DXM2 in
Compressor
Section
Communicating
WDG with
AXM Control
R
A+
A+ B-
B-
C
R
C
24V
A+
B-
C
24V
A+
B-
C
Figure 7: 4-Wire Connection to ATC communicating
thermostat, AXM Communicating control
and HTS Splits
Figure 6: Connection to Non-Communicating
thermostat and AXM communicating control
in WDG Air Handler
Thermostat Connections
C 24V Common for Control Circuit
R 24V Supply for Control Circuit
A+ Communications (Positive)
B – Communications (Negative)
Non-Communicating
2 Cool / 3 Heat Thermostat
Compressor
Compressor Stage 2
Communicating
TAH AXM Control
Y1
Y2
O
R
G
C
DH
AL1
Y1
Y2
DXM2 In
Compressor
Section
Fault LED L
Reversing Valve O
24Vac Hot R
Fan G
24Vac Common C
DH
Dehumidification
(ATP32U04 Only)
C
A+
B-
24V
C
A+
B-
24V
Dehumidification

15
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
ECM Blower Control
The ECM fan is controlled directly by the DXM2/AXM control
board that converts thermostat inputs and CFM settings to signals
used by the ECM motor controller. To take full advantage of the
ECM motor features, a communicating multi-stage thermostat
should be used.
The AXM control maintains a selectable operating airflow [CFM]
for each heat pump operating mode. For each operating mode
there are maximum and minimum airflow limits. See the ECM
Blower Performance tables for the maximum, minimum, and
default operating airflows.
Airflow levels are selected using the configuration menus of a
communicating thermostat or diagnostic tool. The configuration
menus allow the installer to independently select and adjust the
operating airflow for each of the operating modes. Air flow can be
selected in 25 CFM increments within the minimum and maximum
limits shown in Table 8. The blower operating modes include:
• First Stage Cooling (Y1 & O)
• Second Stage Cooling (Y1, Y2, & O)
• First Stage Cooling in Dehumidification Mode
(Y1, O, & Dehumid)
• Second Stage Cooling in Dehumidification Mode
(Y1, Y2, O, & Dehumid)
• First Stage Heating (Y1)
• Second Stage Heating (Y1 & Y2)
• Third Stage (Auxiliary) Heating (Y1, Y2, & W)
• Emergency Heating (W with no Y1 or Y2)
• Fan (G with no Y1, Y2, or W)
The ECM motor includes “soft start” and “ramp down” features.
The soft start feature is a gentle increase of motor rpm at blower
start up. This creates a much quieter blower start cycle.
The ramp down feature allows the blower to slowly decrease rpm
to a full stop at the end of each blower cycle. This creates a much
quieter end to each blower cycle and adds overall unit efficiency.
The ramp down feature is eliminated during an ESD (Emergency
Shut Down) situation. When the DXM2 ESD input is activated,
the blower and all other control outputs are immediately de-
activated.
The duration of the “ramp down” periods are adjustable from
0 seconds to 255 seconds. This adjustment is available in the
Aiflow Selection screen using the communicating thermostat or
configuration/diagnostics tool, see Figure 8.
Special Note for AHRI Testing: To achieve rated airflow for AHRI
testing purposes, it is necessary to change the CFM settings to
rated airflow.
AIRFLOW SELECTION
CFM
HEAT STAGE 1 600
HEAT STAGE 2 750
AUXILIARY HEAT 850
EMERGENCY HEAT 850
COOL STAGE 1 525
COOL STAGE 2 700
COOL DEHUMID 1 425
COOL DEHUMID 2 550
CONTINUOUS FAN 350
HEAT OFF DELAY 60
COOL OFF DELAY 30
PREVIOUS NEXT
Figure 8: Airflow Configuration Screen on Communicating
Thermostat

16
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
WDG Blower
Airflow in CFM with wet coil and clean air filter
Model Max ESP
(in. wg)
Fan
Motor
(hp) Range Cooling Mode Dehumid Mode Heating
Mode Fan
Only
Mode
Aux/
Emerg
Mode
Stg 2 Stg 1 Stg 2 Stg 1 Stg 2 Stg 1
WDG
024 1.0 1/2
Default 700 525 550 425 750 600 350 850
Maximum 1000 800 800 600 1000 850 1000 1000
Minimum 600 450 550 400 600 450 300 700
WDG
036 0.9 1/2
Default 1050 800 850 650 1100 850 550 1350
Maximum 1500 1100 1200 900 1500 1100 1500 1500
Minimum 900 675 825 600 900 675 450 1350
WDG
048 1.0 1
Default 1400 1050 1100 850 1500 1150 700 1500
Maximum 2000 1500 1600 1200 2000 1500 2000 2000
Minimum 1200 900 1100 825 1200 900 600 1350
WDG
060 0.7 1
Default 1750 1300 1400 1050 1875 1450 875 1875
Maximum 2300 1900 2000 1500 2300 1900 2300 2300
Minimum 1500 1100 1375 1000 1500 1100 750 1500
Airflow is controlled within 5% up to the Max ESP shown with wet coil
Blower Performance Data

17
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
1. These Air Handlers are shipped from the factory wired for
230 volts. The units may be wired for 208 or 115 volts. Follow
instructions on unit wiring diagram located on blower housing
and in the Service Facts document included with the unit.
2. The selection of wire and fuse sizes should be made according
to the Minimum Branch Circuit Ampacity and the Maximum
Overcurrent Device listed on the unit nameplate.
3. Field wiring diagrams for electric heaters and unit accessories
are shipped with the accessory.
4. Wiring must conform to National and Local codes.
5. Ground unit per local codes with good safety procedures.
NOTE: If air handler is used with or without a heater,
the electrical entry hole as well as any other cabinet
penetrations must be sealed air-tight.
Wiring Instructions for 115 volt Conversion from 230 volt
1. Disconnect all power to the unit.
2. Disconnect Transformer primary orange wire from power
block T2 and insulate open end of wire. Connect the white
lead from transformer primary wire to power block terminal T2.
Note: (L2 will be used as Netural)
3. Remove plug in ECM power wiring harness (Fig. 8) and Install
2 pin jumper plug provided in control box (Fig. 9).
NOTE: When supplementary heaters are installed,
inspect to insure that all packaging material has been
removed.
Electrical - Power Wiring
 WARNING! Figure 8: Remove Harness Plug
Figure 9: Install Two Pin Jumper Plug
Note: For 115V power only. Damage will occur to motor with
230V power supply if 115V jumper is used.
Table 3: Electric Table
WARNING! Electrical shock hazard - Lock unit disconnect
switch in open position before servicing unit. Failure to follow
this warning could result in property damage, personal injury,
or death.
Model Volt Code
208/230
Rated Voltage
Dual Rated
(115) 208/230
Voltage Min/
Max Dual
Rated
(115) 208/230
Fan
Motor
FLA
Fan
Motor
HP
Max
Fan
ESP
Min Circ
Amp
(115)
208/230
Total
Unit
FLA
Max Fuse/
HACR
(115)
208/230
024 1 (115) 208/230 (114/132)
197/254 (7.7) 4.3 1/2 1.0 (7.8) 4.9 (7.7) 4.3 (15) 15
036 1 (115) 208/230 (114/132)
197/254 (7.7) 4.3 1/2 0.9 (7.8) 4.9 (7.7) 4.3 (15) 15
048 1 (115) 208/230 (114/132)
197/254 (12.8) 7 1 1.0 (14.4) 8.6 (12.8) 7 (25) 15
060 1 (115) 208/230 (114/132)
197/254 (12.8) 7 1 0.7 (14.4) 8.6 (12.8) 7 (25) 15
Rated Voltage of 208/230/60/1, field convertible to 115V.

18
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
WDG024-060 Wiring Diagram 115-208-230/60/1 ECM

19
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Locate electric heat assembly
on pins in discharge panel
and insert screws
Relocate blower in electric
heat assembly in same
manner
Overview
The HG Series Auxiliary Electric Heat mounts internally in
upflow (Figures 10-12) or downflow units and horizontal units.
Horizontal units are rated for zero clearance at the unit and 1"
clearance for first three feet of duct, vertical units rated for zero
clearance for both unit and duct. Downflow units can not be
located directly over a discharge register. The discharge plenum
must be constructed from non combustible material. The HG
electric heat contains a four stage relay control board which
activates the elements directly via an internally wired low voltage
harness. Low voltage signals (W1 and W2) are staged from the
AXM control.
Vertical Upflow or Downflow and Horizontal Installation
1. Disconnect power to the unit
2. Remove blower access panels.
3. Clip wire-tie holding electric heat low voltage 3-wire harness
to discharge panel stiffener.
4. Remove blower mounting screws and then drop down
blower assembly as shown in Figure 11. Removal of blower
wires should not be necessary.
5. Install electric heat in discharge flange where blower
assembly has been removed using provided screws as
shown In Figure 12.
5.5 For downflow or horizontal right discharge units, the air
handler support bracket must be removed to re-install the
blower housing assembly. After re-installing the blower
housing, re-install the air handler support bracket.
6. Re-install blower assembly, Figure 12, into electric heat
assembly using blower mounting screws. Check blower
wiring for proper wiring connections.
7. Route the low voltage harness through the provided ‘pie’
bushing and plug into electric heat control board connector
P2 as shown in Figure 18.
8. Install power conduit through unit corner post knockout and
attach conduit directly to the electric heat control box.
9. Optional: HG**C kits only. Blower power may be supplied
from T3 & T4 CB5 breaker. Refer to WDG wiring diagram
96B0005N58.
Electric Heat Installation
Figure 11: Blower removal
Figure 12: HG electric heat mounting and
blower re-installation
Figure 10: Typical air handler installation
Route condiut thru cabinet and
connect to electric heat control
box. Seal to eliminate air leaks on
cabinet exterior.
Low voltage control
harness is prewired
on all distributor class units.
Electric Heat
Assembly
Auxiliary electric heat
power supply knockout
opposite air coil
Disconnect (optional
refer to local code)
Air Coil

20
Installation, Operation & Maintenance AIR HANDLER SERIES Heat Controller, Inc.
Figure 15: Power Wiring, Dual Circuits, 15 and 20kw
Wiring and Setup (all models)
1. Install power wiring and connect to power block or circuit
breakers. In 12, 15 or 20kW models two power circuits may
be used to reduce wiring and breaker costs as in Figure 16.
If a single circuit supply is desired, install the optional single
circuit accessory kit (P/N 16B0002N02), as shown in Figure
15, that can be obtained from your distributor.
2.
Ensure unit airflow setting is above minimum airflow rating for
the electric heat model from Table 2.
3. Check staging jumpers for the application. Typically only
5 kW (factory setting on all models except 10kW on 20kW
models) is needed for first stage electric (W1) to minimize
electric demand. This staging can be adjusted by moving the
staging jumpers as shown in Figure 17. Whatever is jumped
to P1 pin 1 will be energized on 1st stage of electric heat,
and P1-2 will be energized as stage 2 electric heat. See
Table 5 for staging options.
4. Mark the appropriate box of the electric heat model installed
on the additional serial plate on the exterior of the unit.
5. Turn on the power to the unit and the auxiliary
electric heat.
Auxiliary Electric Heat Start-up
Put thermostat in emergency heat mode (manual mode on
communicating t-stat) and set point to high setting. Unit will
require 15-20 seconds before engaging emergency heat mode
stage 1 (W1) and then another 15-20 seconds to engage stage 2
(W2) when in ‘Test mode’. Verify proper electric heat operation.
Exit manual mode for normal operation.
Figure 16: Staging Jumpers
Figure 13: Power Wiring, 4, 5, 8, and 10kw
Electric Heat Wiring
21
2))
21
2))

3
,QDQGN:XQLWV
WZRSRZHUFLUFXLWVDUH
HPSOR\HGWRUHGXFHZLUHV
VL]HDQGFRVWRIEUHDNHUV
/
/
/
/
3
&RQGXLW
NO
Com ER1
NO
Com ER2
NO
Com ER3
NO
Com ER4
123
Tan
Ora
Factory Staging
(see Table 2)
Low Voltage Connector
(from Unit Control Board)
AG Electric Heat
Relay Board P1P2
24V
W1
W2
4
5kW (‘ER1’ 5kW & ‘ER4’ 0kW) and W2 (second stage)
will have 10kW (‘ER2 & 3’ 5kW each)
1234
Tan
Ora
P2
Side View as seen in Control Box
P1
Staging Example on a 15kW unit W1 (first stage) has
blank
HG
Figure 14: Power Wiring, Single Circuit, 15, 20kw
MANUAL OPERATING MODE
Y1 COMM OUTPUT OFF
Y2 COMM OUTPUT OFF
W COMM OUTPUT OFF
O COMM OUTPUT OFF
G COMM OUTPUT OFF
H COMM OUTPUT OFF
DH COMM OUTPUT OFF
ECM AIRFLOW 0
PUMP SPEED 0%
TEST MODE OFF
SELECT OPTION
PREVIOUS SELECT
Y1 COMM OUTPUT OFF
W COMM OUTPUT OFF