Whirlpool WAHMS User manual

AIR HANDLER INSTALLATION INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
Table of Contents
IMPORTANT SAFETY INSTRUCTIONS ....................................... 1
IMPORTANT NOTE TO THE OWNER REGARDING
PRODUCT WARRANTY................................................................. 3
SHIPPING INSPECTION................................................................ 3
CODES AND REGULATIONS........................................................ 3
REPLACEMENT PARTS................................................................ 3
PREINSTALLATION INSTRUCTIONS .......................................... 3
LOCATION...................................................................................... 3
DUCTWORK ................................................................................... 3
Return Ductwork.......................................................................... 4
Return Air Filters .......................................................................... 4
ELECTRIC HEAT............................................................................ 4
HKR Installation ........................................................................... 4
ELECTRICAL SUPPLY WIRE AND MOP ..................................... 5
Building Electrical Service Inspection ......................................... 5
Wire Sizing ................................................................................... 5
Maximum Overcurrent Protection (MOP).................................... 5
Electrical Connections—Supply Voltage..................................... 5
Air Handler Only—Nonheat Kit Models....................................... 5
Air Handler With Noncircuit Breaker Heat Kits............................ 5
Air Handler With Heat Kits Containing a Circuit Breaker............ 5
Low Voltage Connections............................................................ 6
REFRIGERANT LINES ................................................................... 6
Tubing Preparation ...................................................................... 6
Special Instructions ..................................................................... 6
DOWNFLOW CONVERSION......................................................... 7
Horizontal Conversion ................................................................. 7
CONDENSATE REMOVAL ............................................................ 8
ACHIEVING 2% LOW LEAKAGE RATE ....................................... 9
WAHMS MOTOR............................................................................ 9
Motor Speed Adjustment ............................................................ 9
WAHME MOTOR............................................................................ 9
CFM Delivery ............................................................................... 9
THERMOSTATS........................................................................... 10
START-UP PROCEDURE............................................................ 10
REGULAR MAINTENANCE......................................................... 10
WIRING DIAGRAMS .................................................................... 10
System Composite Diagram—WAHMS 18 to 60—
10kW and Below........................................................................ 10
System Composite Diagram—WAHMS 18 to 60—
Above 10kW............................................................................... 11
Wiring Diagram—Low Voltage for WAHMS Cooling Unit
with Optional Heat Kit 10kW and Below................................... 11
Wiring Diagram—Low Voltage for WAHMS Cooling Unit
with Optional Heat Kit 15kW and Above................................... 12
WAHME THERMOSTAT CONNECTIONS.................................. 12
Thermostat Connection—WAHME Cooling Unit
with Optional Heat Kits of 10kW and Below............................. 13
Thermostat Connection—WAHME Cooling Unit
with Optional Heat Kits of 15kW and Above—
Thermostat with 2-Stage Heat .................................................. 13
Thermostat Connection—WAHME Heat Pump Unit
with Optional Heat Kits of 10kW and Below............................. 14
Thermostat Connection—WAHME Heat Pump Unit
with Optional Heat Kits of 15kW and Above............................. 14
ELECTRONIC BLOWER TIME DELAY RELAY.......................... 15
ASSISTANCE OR SERVICE ........................................................ 16
Whirlpool®Models WAHMS, WAHME
WPIO-355E
ATTENTION INSTALLATION PERSONNEL
As a professional installer, you have an obligation to know the product better than the customer. This includes all
safety precautions and related items. Prior to actual installation, thoroughly familiarize yourself with this instruction
manual. Pay special attention to all safety warnings. Often during installation or repair, it is possible to place
yourself in a position which is more hazardous than when the unit is in operations.
Remember, it is your responsibility to install the product safely and to know it well enough to be able to instruct a
customer in its safe use. Safety is a matter of common sense...a matter of thinking before acting. Most dealers have
a list of specific good safety practices...follow them.
The precautions listed in this installation manual are intended as supplemental to existing practices. However, if
there is a direct conflict between existing practices and the content of this manual, the precautions listed here take
precedence.

2
Recognize this symbol as a safety precaution.
Recognize Safety Symbols, Words and Labels
The following symbols and labels are used throughout this manual to
indicate immediate or potential hazards. It is the owner’s
responsibility to read and comply with all safety information and
instructions accompanying these symbols. Failure to heed safety
information increases the risk of serious personal injury or death,
property damage and/or product damage.
Goodman 1
Hazards or unsafe practices could result in property
damage, product damage, severe personal injury or death.
Hazards or unsafe practices may result in property
damage, product damage, personal injury or death.
WARNING
CAUTION
Goodman 6
HIGH VOLTAGE!
WARNING
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
Goodman 7
Installation and repair of this unit should
be performed ONLY by individuals meeting
the requirements of an “Entry Level Technician,”
at a minimum, as specified by the Air-Conditioning,
Heating and Refrigeration Institute (AHRI). Attempting
to install or repair this unit without such background may
result in product damage, personal injury or death.
WARNING
Goodman 33
WARNING
This product is factory-shipped for use with 208/240/1/60
electrical power supply. DO NOT reconfigure this air
handler to operate with any other power supply.
Goodman 36
WARNING
Do not connect to or use any device that is not design-
certified for use with this unit. Serious property damage,
personal injury, reduced unit performance and/or hazardous
conditions may result from the use of such non-approved
devices.
Goodman 37
WARNING
To prevent the risk of property damage, personal injury, or
death, do not store combustible materials or use gasoline
or other flammable liquids or vapors in the vicinity of this
unit.
Goodman 34
WARNING
To avoid property damage, personal injury or death due to
electrical shock, this unit MUST have an uninterrupted,
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 performed
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.
Goodman 35
When installing or servicing this equipment, safety
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.
CAUTION
Goodman 38
CARBON MONOXIDE POISONING HAZARD
Special Warning for Installation of Furnace or Air Handling
Units in Enclosed Areas such as Garages, Utility Rooms or
Parking Areas.
Carbon monoxide producing devices (such as an
automobile, space heater, gas water heater, etc.) should
not be operated in enclosed areas such as unventilated
garages, utility rooms or parking areas because of the
danger of carbon monoxide (CO) poisoning resulting from
the exhaust emissions. If a furnace or air handler is
installed in an enclosed area such as a garage, utility room
or parking area and a carbon monoxide producing device is
operated therein, there must be adequate, direct outside
ventilation.
This ventilation is necessary to avoid the danger of CO
poisoning which can occur if a carbon monoxide producing
device continues to operate in the enclosed area. Carbon
monoxide emissions can be (re)circulated throughout the
structure if the furnace or air handler is operating in any
mode.
CO can cause serious illness including permanent brain
damage or death.
DANGER

3
IMPORTANT NOTE TO THE
OWNER REGARDING
PRODUCT WARRANTY
Your warranty certificate is supplied as a separate document with
the unit installed by your contractor. Read the limited warranty
certificate carefully to determine what is and is not covered. Keep
the warranty certificate in a safe place. If you are unable to locate
the warranty certificate, please contact your installing contractor,
or contact customer service at 1-866-944-7575 to obtain a copy.
To receive the 10-Year Parts Limited Warranty, online registration
must be completed within 60 days of installation. Online
registration is not required in California or Quebec.
Full warranty details and instructions for models currently in
production are available at www.whirlpoolhvac.com. If your
model is not currently in production or does not appear on the
website, please contact your installing contractor or contact
customer service at 1-866-944-7575 to obtain a copy of your
warranty certificate.
To register your unit, go to www.whirlpoolhvac.com. Click on the
manufacturer’s Comfort CommitmentTM Warranty link located at
the bottom center of the home page. Next, click on the Click
Here to Register Your Product link located at the top center of the
page, and complete the forms in the manner indicated.
SHIPPING INSPECTION
Always keep the unit upright; laying the unit on its side or top
may cause equipment damage. Shipping damage, and
subsequent investigation, is the responsibility of the carrier. Verify
the model number, specifications, 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.
CODES AND REGULATIONS
This product is designed and manufactured to comply with
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 fines. Should you have any questions, please contact
the local office of the EPA.
REPLACEMENT PARTS
When reporting shortages or damages, or ordering repair parts,
give the complete product model and serial numbers as stamped
on the unit’s nameplate. 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:
Tradewinds Distributing Company, LLC
14610 Breakers Drive
Jacksonville, Florida 32258
1-866-944-7575
If you are replacing an air handler, the system must be
manufacturer-approved and Air-Conditioning, Heating, and
Refrigeration Institute (AHRI) matched.
NOTE: Installation of unmatched systems is strongly
discouraged.
PREINSTALLATION
INSTRUCTIONS
Carefully read all instructions for the installation prior to installing
the product. Make sure each step or procedure is understood
and any special considerations are taken into account before
starting the 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.
LOCATION
NOTE: Air handlers are designed for indoor installation only.
Give special consideration to minimizing the length of refrigerant
tubing when installing air handlers. Refer to Remote Cooling/Heat
Pump Service Manual or TP-107 Long Line Set Application
R-410A for guidelines. The unit clearance from a combustible
surface may be 0". However, service clearance is to take
precedence. In addition, allow a minimum of 24" (61 cm) in front
of the unit for service clearance.
Do not install the air handler in a location that violates the
instructions provided with the condenser.
If the unit is located in an 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"
(5.1 cm) fiberglass insulation with a vapor barrier is
recommended.
Consult all appropriate regulatory codes prior to determining the
final clearances. When installing this unit in an area that may
become wet, elevate the unit with a sturdy, non-porous material.
In installations that may lead to physical damage (for example, a
garage) it is advised to install a protective barrier to prevent such
damage.
DUCTWORK
This air handler is designed for a complete supply and return
ductwork system.
To ensure correct system performance, the ductwork is to be
sized to accommodate 375 to 425 CFM per ton of cooling with
the static pressure not to exceed 0.5" W.C. Inadequate ductwork
that restricts airflow can result in improper performance and
compressor or heater failure. Ductwork is to be constructed in a
manner that limits restrictions and maintains suitable air velocity.
Ductwork is to be sealed to the unit in a manner that will prevent
leakage.
Goodman 39
Do not operate this product without all the ductwork
attached.
CAUTION

4
Return Ductwork
NOTE: Do not terminate the return ductwork in an area that can
introduce toxic or objectionable fumes/odors into the ductwork.
The return ductwork is to be introduced into the air handler
bottom (upflow configuration).
Return Air Filters
Each installation must include a return air filter. This filtering may
be performed at the air handler or externally such as a return air
filter grille. Air handlers mounted in the downflow orientation,
including “B” series, require external filtering. A washable filter is
available as an accessory. To ensure optimum performance,
frequent filter cleaning is advised. Refer to the following chart for
the appropriate filter.
ELECTRIC HEAT
Refer to this manual in combination with the instructions
provided with the heat kit for the correct installation procedure.
The air handlers listed in this manual do not have factory-
installed electric heat. Electric heat is available as an accessory. If
installing this option, the only heat kits that can be used are the
HKR series.
NOTE: The EHK, ECB, EDB and EDK kits are not approved for
use with these air handlers.
The heating mode temperature rise is dependent upon the
system airflow, the supply voltage and the heat kit size (kW)
selected. Use the Temperature Rise tables to determine the
temperature rise ºF (ºC).
NOTE: For installations not indicated in the Temperature Rise
tables, the following formula is to be used:
NOTE: The Temperature Rise tables can also be used to
determine the air handler airflow 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 2 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.
Use HKR specification sheets to determine the HKR available for
a given air handler.
HKR Installation
Follow instructions listed in the Installation and Operating
Instructions shipped with the heat kit.
WAHMS WAHME Filter Number Quantity Required
1824 N/A FIL 18-32 1
3030
1931
3636
1830 FIL 36-42 1
3642
3743
4860
3137
4260
FIL 48-61 1
Temperature Rise Table ºF—230/1/60 Supply Voltage
CFM
Heat Kit Nominal kW—ºF
3 5 6 8 10 15 20 21
600 18 28 35 41
800 13 21 26 31 42
1,000 11 17 21 25 34 50
1,200 9 14 18 21 28 42 56 62
1,400 8 12 15 18 24 36 48 53
1,600 7 10 13 15 21 31 42 46
1,800 6 9 12 14 19 28 37 41
2,000 5 8 11 12 17 25 34 37
Temperature Rise Table ºF—220/1/60 Supply Voltage
CFM
Heat Kit Nominal kW—ºF
3 3 5 6 8 10 15 20
600 17 27 34 39
800 13 20 25 30 40
1,000 10 16 20 24 32 48
1,200 8 13 17 20 27 40 53 59
1,400 7 11 14 17 23 34 46 51
1,600 6 10 13 15 20 30 40 44
1,800 6 9 11 13 18 27 36 39
2,000 5 8 10 12 16 24 32 35
Temperature Rise Table ºF—208/1/60 Supply Voltage
CFM
Heat Kit Nominal kW—ºF
3 5 6 8 10 15 20 21
600 16 25 32 37
800 12 19 24 30 38
1,000 10 15 19 22 30 46
1,200 8 13 16 19 25 38 51 56
1,400 7 11 14 16 22 33 43 48
1,600 6 9 12 14 19 28 38 42
1,800 5 8 11 12 17 25 34 37
2,000 5 8 10 11 15 23 30 34
TR = (kW x 3412) x (Voltage Correction) x 1.08 / CFM
Where: TR = Temperature Rise
kW = Heater Kit Actual kW
3412 = Btu per kW
Voltage Correction = 96 (230 Supply Volts)
= 92 (220 Supply Volts)
= 87 (208 Supply Volts)
1.08 = Constant
CFM = Measured Airflow

5
ELECTRICAL SUPPLY WIRE AND MOP
Building Electrical Service Inspection
This unit is designed for single-phase electrical supply.
NOTE: Do not operate on a 3-phase power supply.
Measure the power supply to the unit. The supply voltage must
be in agreement with the unit nameplate power requirements and
within the range shown in the following table.
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 size must carry the Minimum Circuit Ampacity (MCA).
■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 size allows for no more than a 2% voltage drop from the
building breaker/fuse panel to the unit.
■Refer to the latest edition of the National Electric Code, or in
Canada, the Canadian Electric Code when determining the
correct wire size. The following table shows the current
carrying capabilities for copper conductors rated at 75ºC with
a 2% voltage drop. Use the following table to determine the
voltage drop per foot of various conductors.
*Based on NEC 1996.
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 can be used as a guide for
selecting the MAXIMUM overcurrent device.
NOTE: Fuses or circuit breakers are to be sized larger than the
equipment MCA but not to exceed the MOP.
Electrical Connections—Supply Voltage
IMPORTANT: Use copper conductors only.
A knockout is provided on the air handler top panel or side to
allow for the entry of the supply voltage conductors. 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. The wire is to be sized in accordance with the
“Electrical Wire and MOP” section of this manual. Some areas
require the supply wire to be enclosed in conduit. Consult your
local codes.
Air Handler Only—Nonheat Kit Models
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.
Air Handler With Noncircuit Breaker Heat Kits
A terminal block is provided with the HKR kit to attach the power
supply and air handler connections. Follow the HKR Installation
Manual and wiring diagram for complete wiring details.
Air Handler With Heat Kits Containing
a Circuit Breaker
HKR models with a “C” suffix contain a circuit breaker(s). The air
handler has a plastic cover on the access panel that will require
either one or both sections to be removed to allow the heat kit
circuit breaker(s) to be installed. See the HKR Installation
Instructions for further details. The air handler wires and supply
wires are installed directly onto the HKR circuit breaker(s) as
shown in the HKR Installation Manual and wiring diagram.
Nominal Input Minimum Voltage Maximum Voltage
208/240 187 253
Goodman 22
To avoid the risk of fire or equipment damage, use
copper conductors.
WARNING
Goodman 6
HIGH VOLTAGE!
WARNING
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
Goodman 34
WARNING
To avoid property damage, personal injury or death due to
electrical shock, this unit MUST have an uninterrupted,
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 performed
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.
Maximum Allowable Length in Feet to
Limit Voltage Drop to 2%*
Wire
Size
(AWG)
Minimum Circuit Ampacity (MCA)
10 15 20 25 30 35 40 45
14 75 50 37 NR NR NR NR NR
12 118795947NRNRNRNR
10 188 125 95 75 63 54 NR NR
8 301 201 150 120 100 86 75 68
6 471 314 235 188 157 134 118 110

6
Low Voltage Connections
Several combinations of low voltage schemes are available,
depending on the presence of a heat kit and whether the heat kit
is single-stage or multistaging. The low voltage connections are
determined by whether the outdoor unit is a condenser or heat
pump. The 24V-control voltage connects the air handler to the
room thermostat and condenser. Low voltage wiring is to be
copper conductors. A minimum of 18AWG must be used for
installations up to 50’ (15.2 m) and 16AWG for installations over
50’ (15.2 m). Low voltage wiring can 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.
REFRIGERANT LINES
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 pipe cutters to remove
the closed end.
Post Brazing
Quench all welded joints with water or a wet rag.
Piping Size
For the correct tubing size, follow the specification for the
condenser/heat pump.
Special Instructions
This coil comes equipped with a check style flowrator for
refrigerant management. For most installations with matching
applications, no change to the flowrator piston is required.
However, in mix-matched applications, a flowrator piston change
may be required. See the piston kit chart or consult your local
distributor for details regarding mix-matched piston sizing. If the
mix-match application requires a different piston size, change the
piston in the flowrator on the indoor coil before installing the coil
and follow the procedure shown below.
IMPORTANT: Torch heat required to braze tubes of various sizes
is proportional to the size of the tube. Tubes of smaller size
require less heat to bring the tube to brazing temperature before
adding brazing alloy. Applying too much heat to any tube can
melt the tube. Service personnel must use the appropriate heat
level for the size of the tube being brazed.
NOTE: The use of a heat shield when brazing is recommended to
avoid burning the serial plate or the finish on the unit. Heat trap or
wet rags should be used to protect heat sensitive components
such as service valves and TXV valves.
1. Loosen the ¹³⁄₁₆" nut one turn only to allow high pressure
tracer gas to escape. No gas indicates a possible leak.
2. After the gas has escaped, remove the nut and discard the
black or brass cap.
3. Remove the check piston to verify it is correct and then
replace the piston. See the piston kit chart in the instructions.
4. Use a tube cutter to remove the spin closure on the suction
line.
5. Remove the tailpiece clamped to the exterior and slide the
¹³⁄₁₆" nut into place.
6. Braze the tailpiece to the line set liquid tube.
7. Insert the suction line into the connection.
8. Slide the insulation and the rubber grommet at least 18"
(45.7 cm) away from the braze joint.
9. Braze suction line.
10. After the tailpiece has cooled, confirm position of the white
Teflon®seal and hand tighten the ¹³⁄₁₆" nut.
11. Torque the ¹³⁄₁₆" nut to 10 to 25 ft-lbs. or tighten one-sixth
turn.
12. Replace the suction line, grommet and insulation.
Goodman 4
This product is factory-shipped under pressure. Follow
these instructions to prevent injury.
WARNING
Goodman 3
To protect the unit when welding close to the painted
surfaces, the use of a quenching cloth is strongly advised
to prevent scorching or marring of the equipment finish.
Solder with a minimum of 5% silver is recommended.
CAUTION
Applying too much heat to any tube can melt the tube.
Torch heat required to braze tubes of various 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.
CAUTION
A. Tailpiece
B.
¹³⁄₁₆ " nut
C. Plastic or brass cap
D. White Teflon®seal
E. Piston
A. Rubber grommet
B. Suction line with spin closure
A
BC
E
D
®Teflon is a registered trademark of E.I. Dupont de Nemours and
Company.
Goodman 8
Excessive torque can cause orifices to stick. Use the
proper torque settings when tightening orifices.
CAUTION
B
A

7
DOWNFLOW CONVERSION
“D” nomenclature models are factory equipped for dedicated
downflow operation and no field conversion is required.
Conversion to downflow must be performed in an area that
allows access to all sides prior to placing the air handler in its
final location. To keep the evaporator coil pan from sweating, the
DPI accessory insulation kit is to be used when performing this
conversion.
NOTE: The DPI kit is not supplied with this product and is to be
purchased separately. See the following chart for the correct DPI
kit.
Refer to “Invert Air Handler,” “Evaporator Coil Pan” and
“Evaporator Coil” illustrations for the location of the components
referenced in the following steps. “Invert Air Handler” illustration
shows the new installation location for the removed components.
1. Before inverting the air handler, remove all access panels, the
coil rear channel bracket and the filter close-off panel.
2. Remove the evaporator coil and the horizontal drain pan.
3. Discard the horizontal drain pan.
4. Install the plastic plug (provided) into the vacated access
panel.
5. Remove the 2 zee coil support brackets and insulation
retaining brackets.
6. Remove the tie bracket.
7. Install the DPI Insulation Kit onto the bottom of the drain pan.
Invert Air Handler
8. Install the zee coil supports and the wrapper stiffeners.
9. Install the tie bracket.
10. Install the rear channel bracket.
11. To avoid possible condensate “blow off,” the insulation
retainers are to be laid into the evaporator coil pan as shown
in the “Evaporator Coil Pan” illustration.
Evaporator Coil Pan
12. To complete the conversion, slide the evaporator coil into the
chassis and attach the 3 access panels. Refer to the
“Evaporator Coil” illustration.
Evaporator Coil
NOTE: When the air handler is converted to the downflow
position, the coil may protrude above the cabinet on some
models.
Horizontal Conversion
Dedicated downflow models are not suitable for horizontal
application and must not be used for this type of installation. The
only field modification required for conversion to “Horizontal
Right-Hand” is the removal of the plastic knockouts in the
horizontal panel drain connections. To keep the horizontal drain
pan from sweating in high humidity applications, it is
recommended that a DPIH insulation accessory kit be used.
NOTE: The DPIH insulation kit is not supplied with this product
and should be purchased separately. See the following chart for
the correct DPIH kit.
WVAHM or WAHMS Model Insulation Kit
1824 DPI18-30/20
3030/1931/3636 DPI36-42/20
3642/3743/4860/4961 DPI48-61/20
A. Access panel
B. Return air side of unit
C. Rear channel bracket
D. Zee coil support bracket
E. Coil retaining bracket
F. Ti e b racket
A
B
C
D
E
F
A. 3" (7.6 cm) flat insulation retainer (both sides)
A. Wrapper
B. Insulation jacket
C. Zee coil support
D. Wrapper stiffener
E. Drain pan insulation kit
F. Blower assembly
WVAHM or WAHMS Model Insulation Kit
1824 DPI18-32
3030/1931/3636 DPI36-42
3642/3743/4860/4961 DPI48-61
A
A
B
C
D
E
F

8
The following describes converting to “Horizontal Left-Hand.”
Conversion to downflow must be performed in an area that allows
access to all sides prior to placing the air handler in its final location.
Horizontal Left-Hand Conversion
1. Remove the 3 air handler access panels.
2. Remove the “J” shaped bracket that retains the evaporator
coil.
3. Remove the flowrator from the lower left side access panel
and slide out the evaporator coil and horizontal drain pan.
4. Remove the gasket from the horizontal pan drain
connections.
5. Remove the oval shaped plastic plug from the left side
access panel.
6. Remove the oval shaped rubber gasket seal from the lower
right side access panel.
7. The drain connections for the horizontal pan are sealed with a
thin coating of plastic. Carefully knock out this plastic seal
with a screwdriver and hammer.
NOTE: The upper drain will become the secondary drain
which is mandatory in many municipalities.
8. Install the plastic plug removed in Step 5 to the right side
lower access panel and the oval shaped rubber gasket to the
lower left access panel.
9. Reinstall the evaporator coil with the horizontal panel on the
left side.
NOTE: Push the assembly completely to the rear to ensure
the engagement of the upflow pan with the rear channel
bracket.
10. Install the “J” bracket removed in Step 2 to support the
upflow pan to the tie channel.
11. Attach all panels and the metering device.
CONDENSATE REMOVAL
The coil drain pan has a primary and an optional secondary drain
with ³⁄₄" NPT female connections. The connectors required can
be ³⁄₄" NPT male either PVC, CPVC or metal pipe and should be
hand tightened to a torque of approximately 37 in.-lbs to prevent
damage to the drain pan connection. An insertion depth between
0.355" (9 mm) to 0.485" (12.3 mm) (3 to 5 turns) should be
expected at this torque. Use the female (³⁄₄ fpt) threaded fitting
that protrudes outside of the enclosure for external connections.
1. Ensure drain pan hole is NOT obstructed.
2. To prevent potential sweating and dripping on to finished
space, it may be necessary to insulate the condensate drain
line located inside the building. Use Armaflex®or similar
material.
3. A secondary condensate drain connection has been provided
for areas where the building codes require it. Pitch the drain
line ¹⁄₄" (6.4 mm) per foot to provide free drainage.
4. Insulate the drain lines located inside the building to prevent
sweating.
5. Install a condensate trap to ensure proper drainage.
6. If the secondary drain line is required, run the line separately
from the primary drain and end it where it can be easily seen.
NOTE: Water coming from this line means the coil primary drain
is plugged and needs clearing.
The installation must include a “P” style trap that is located as
close as is practical to the evaporator coil. See the following
illustration for details of a typical condensate line “P” trap.
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.
Field experience has shown condensate drain traps with an open
vertical Tee between the air handler and the condensate drain trap
can improve condensate drainage in some applications, but may
cause excessive air discharge out of the open Tee. The manufacturer
does not prohibit this type of drain, but the manufacturer also does
not recommend it due to the resulting air leakage.
Regardless of the condensate drain design used, it is the
installer’s responsibility to ensure the condensate drain system is
of sufficient design to ensure proper condensate removal from
the coil drain pan.
Condensate Drain Trap
Use of a condensate removal pump is permitted when necessary.
This condensate pump should have provisions for shutting off the
control voltage should a blocked drain occur. A trap must be
installed between the unit and the condensate pump.
IMPORTANT: The evaporator coil is coated with oils that may
dissolve Styrofoam and certain types of plastics. Therefore, a
removal pump or float 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.
When coils are installed above ceilings, or in other locations
where damage from condensate overflow may occur, it is
mandatory to install a field-fabricated auxiliary drain pan under
the coil cabinet enclosure. Drain lines from the auxiliary pan must
be installed and terminated so that the homeowner can see water
discharges.
A. DPIH kit
B. Secondary drain
C. Primary drain
ABC
A. Cased coil
B. Drain connection
C. Positive liquid seal required at trap
Goodman 2
If secondary drain is not installed, the secondary access
must be plugged.
CAUTION
3" (7.6 cm)
Minimum
2" (5.1 cm) Minimum
A
C
B

9
ACHIEVING 2% LOW
LEAKAGE RATE
Ensure that the Neoprene gasket with PSA remains intact on all
surfaces that the access panels are secured to. These surfaces
are the entire length of the wrapper and areas between the upper
tie plate, upper and lower access panels. Check that the upper
access panel breaker insert gasket is intact and that the flowrator
gasket is installed on the lower access panel. An additional drain
hole cover is required.
WAHMS MOTOR
Motor Speed Adjustment
The motors in all WAHMS are multispeed PSC motors. The color
of the wire coming from the motor to the “COM” terminal on the
control board defines in which speed the motor will operate. The
black wire represents high speed, the red wire represents low
speed and the blue wire (select models only) represents medium
speed.
To change speeds, remove the wire attached to the COM
terminal on the control board, and swap it with the wire on
terminal M1 or M2 with the color that will give the desired speed.
NOTE: On some models, not all speed taps are allowable for
certain electric heat applications. Refer to the air handler series
and ratings plate for minimum speed.
NOTE: Assumes dry coil with filter in place; SCFM correction for
wet coil = 4% (208V/240V).
WAHME MOTOR
The WAHME air handler features an energy efficient blower
motor. The motor is a constant torque motor with very low power
consumption. The motor is energized by 24V AC. Adjust the CFM
by changing the 24V AC leads to the desired speed on the
terminal block.
The WAHME motor blower speed is programmed to deliver
adequate airflow at rated external static pressure and with
60-second off time delay. For details, refer to the specification
sheet applicable to your model.
CFM Delivery
The following table shows the CFM speed tap settings for the
WAHME.
CFM Delivered Against External
Static Pressure
Model Speed 0.1" 0.2" 0.3" 0.4" 0.5"
WAHMS1824P4* High 1,155 1,090 1,025 950 895
Medium 940 890 860 815 755
Low 695 665 650 610 550
WAHMS1931P4* High 1,135 1,085 1,025 965 915
Medium 860 825 780 750 680
Low 600 570 545 500 465
WAHMS3030P4* High 1,385 1,315 1,240 1,155 1,065
Medium 1,340 1,290 1,230 1,140 1,050
Low 1,075 1,030 980 910 840
WAHMS3636P4* High 1,310 1,240 1,155 1,090 1,020
Medium 1,270 1,210 1,140 1,075 980
Low 1,045 1,005 955 885 805
WAHMS3642P4* High 1,700 1,660 1,625 1,545 1,505
Medium 1,500 1,440 1,400 1,350 1,345
Low 1,330 1,300 1,250 1,230 1,220
WAHMS3743P4* High 2,065 2,000 1,925 1,860 1,780
Medium 1,685 1,635 1,550 1,470 1,410
Low 1,490 1,425 1,345 1,280 1,205
WAHMS4860P4* High 2,150 2,120 2,070 2,000 1,940
Medium 1,940 1,930 1,905 1,860 1,790
Low 1,610 1,600 1,590 1,575 1,550
WAHMS4961P4* High 2,150 2,105 2,040 1,970 1,880
Medium 1,960 1,935 1,895 1,825 1,750
Low 1,670 1,625 1,585 1,525 1,455
CFM Delivered Against External
Static Pressure
Model Speed Tap 0.1" 0.2" 0.3" 0.4" 0.5"
WAHME1830P4 1 700 670 650 595 510
2 820 785 765 745 705
3 920 900 850 840 815
4 1,075 1,055 1,015 975 960
5 1,130 1,115 1,085 1,040 1,000
WAHME3137P4 1 1,060 865 600 515 420
2 1,105 910 795 745 690
3 1,165 1,070 1,020 960 915
4 1,285 1,240 1,195 1,140 1,100
5 1,435 1,395 1,350 1,315 1,265
WAHME4260P4 1 1,445 1,275 1,175 940 855
2 1,545 1,405 1,325 1,260 1,145
3 1,660 1,610 1,555 1,490 1,415
4 1,905 1,870 1,810 1,750 1,695
5 2,115 2,070 2,000 1,965 1,915
CFM Delivered Against External
Static Pressure
Model Speed 0.1" 0.2" 0.3" 0.4" 0.5"

10
THERMOSTATS
NOTE: 2nd stage heat can be accomplished by using a multistage
heating thermostat or the addition of an outdoor thermostat as
shown in the System Composite diagrams.
Manufacturer’s Part Number CHT18-60 is a single-stage cool and
single-stage heat thermostat.
Manufacturer’s Part Number HPT18-60 is a single-stage cool,
2-stage heat pump thermostat. The 1st stage is heat pump
heating and the 2nd stage is optional electric heat.
If additional features are desired, such as digital or programmable
capabilities, these thermostats are commercially available. Follow
the thermostat manufacturer’s instruction for installation.
START-UP PROCEDURE
■Prior to start-up, ensure that all electrical connections are
properly sized and tightened.
■All panels must be in place and secured. For airtight
application, neoprene gasket must be positioned at
prescribed locations to achieve 2% leakage.
■Tubing must be leak free.
■Unit should be elevated, trapped and pitched to allow for
drainage.
■Low voltage wiring is connected.
■Auxiliary drain is installed when necessary and pitched to
allow for drainage.
■Drain pan and drain tubing has been leak checked.
■Return and supply ducts are sealed.
■Unit is elevated when installed in a garage or where
flammable vapors may be present.
■Unit is protected from vehicular or other physical damage.
■Return air is not obtained from any areas where there may be
objectionable odors, flammable vapors or products of
combustion such as carbon monoxide (CO), which may
cause serious personal injury or death.
REGULAR MAINTENANCE
The only item to be maintained on a regular basis by the user is
the circulating air filter(s). Filter should be cleaned or replaced
regularly. A certified service technician must perform all other
services.
NOTE: Do not use these diagrams for WAHMV models. See
installation and operating instructions specifically for WAHMV
models.
WIRING DIAGRAMS
System Composite Diagram—WAHMS 18 to 60—10kW and Below
NOTES:
1. Outdoor Thermostat 1
should be the first to
close and the last to
open.
2. Connect the white and
brown wires from the air
handler if an outdoor
thermostat is not used.
3. Remove this wire when
using an outdoor
thermostat.
Wiring is subject to change.
Always refer to the wiring
diagram on the unit for the
most up-to-date wiring.
Goodman 6
HIGH VOLTAGE!
WARNING
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
Goodman 6 Long - top of each page
HIGH VOLTAGE!
WARNING
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage, personal injury or death.
CW2 OYR
R
G
YOCW2 GRE
W
G
R
BR
Y
R
OR
W
W
Heat Pump Typical H/P
Room Thermostat #18 Gauge - 7 Wire
Unit
Red
Green
White
Blue
BU
#18 Gauge - 5 Wire
See
Note 3
Outdoor Thermostat (Optional) Closed on Temperature Fall
#18 Gau
g
e - 6 Wire Needed When Outdoor Thermostat Is Used
BU W OR Y R
BU
BU
Color Codes
R
Y
BU
BR
OR
W
G
Red
Yellow
Blue
Brown
Orange
White
Green