Whirlpool WAHU Installation Instructions Manual
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Whirlpool WAHU, AIR HANDLER INSTALLATION INSTRUCTIONS AIR HANDLER SAFETY Table of Contents AIR HANDLER SAFETY .................................................................1 INSTALLATION REQUIREMENTS................................................2 Tools and Parts ............................................................................2 Outdoor System Requirements ...................................................2 Location Requirements................................................................2 Installation Configurations ...........................................................3 Drain Pan Connections ................................................................4 Elect
Whirlpool WAHU, 2 INSTALLATION REQUIREMENTS These instructions are intended as a general guide only and do not supersede any national or local codes in any way. Compliance with all local, state, or national codes pertaining to this type of equipment should be determined prior to installation. Read this entire instruction manual, as well as the instructions supplied in separate equipment, before starting the installation. All models are designed for indoor installation only. The installation of the air handler, field wiring, warm air ducts, etc. must conform to the requirements
Whirlpool WAHU, 3 Installation Clearances Non-Ducted Return Closet Installation The air handler can be installed in a closet with a false bottom to form a return air plenum or be installed with a return air plenum under the air handler. Louvers or return air grilles are field supplied. Local codes may limit application of systems without a ducted return to single- story buildings. ■ For a unit installed in a closet with a louvered return opening, the minimum open area for the louvers will be as shown below. ■ If the free area is not known, assume a 25% free area for wood or a 75% free area for metal louvers or grilles. ■ Using the lou
4 . Drain Pan Connections Horizontal Installations can be either “Right” or “Left.” For Horizontal Right Installations, a drain pan location change is required. Use drain connections marked “A” below. For Horizontal Left Installations, use drain connections marked “A” below. Conversion to Horizontal Right Before Conversion 1. Remove screws from the blower access cover and li
Whirlpool WAHU, 5 After Conversion 8. Determine knockouts required for drain line connections and remove. 9. Replace the blower and coil access covers. Electrical Requirements—Models Without Factory-Installed Electric Heat NOTE: Use copper conductors only. ■ All field wiring must be done in accordance with National Electrical Code, applicable requirements of UL and local codes, where applicable. ■ Electrical wiring, disconnect means and over-current protection are to be supplied by the installer. Refer to the air handler rating plate for maximum over-current protection, minimum circuit ampacity, as well as operating voltage. ■ The power supply must be sized and protected ac
Whirlpool WAHU, 6 Ductwork Requirements ■ Install the conditioned air plenum, ducts and air filters (not provided) in accordance with NFPA 90B Standard for the Installation of Warm Air Heating and Air-Conditioning Systems (latest edition). ■ The air handler is provided with flanges for the connection of the plenum and ducts. ■ The air handler is equipped with flanges that can form a filter rack for the installation of the air filter, or the filter may be installed as part of the return air duct system. ■ Air filters must be listed as Class 2 furnace air filters. ■ Supply and return ductwork must be adequately sized to meet the system’
Whirlpool WAHU, 7 3. Place air handler in vertical position. Filter Size Chart Install Condensate Drain The air handler is provided with ³⁄₄" NPT condensate drain connections. A field-fabricated secondary drain pan, with a drainpipe to the outside of the building, is required in all installations over a finished living space or in any area that may be damaged by overflow from the main drain pan. In some localities, local codes may require an secondary drain pan for any horizontal installation. When installed in the horizontal position, the air handler must have a ³⁄₄" drop toward the drain outlet of the drain pan to ensur
Whirlpool WAHU, 8 Verify Orifice Size NOTE: Some models are equipped with thermo expansion valve and do not require any orifice change. IMPORTANT: The proper orifice size is dependent on indoor coil/ outdoor unit combination and application. 1. Consult the outdoor unit literature to determine whether the indoor unit has the correct orifice installed. 2. If a change of the orifice is required, loosen the brass hex nut and separate the orifice extension stub from the brass hex fitting. 3. Remove the orifice with an orifice extractor tool. 4. Insert the proper orifice into the fitting, seal end first. Make sure the
Whirlpool WAHU, 9 4. Using UL listed wire nuts, connect the field supply wires to the air handler (black to black and yellow to yellow). 5. Connect ground wire to ground terminal marked “GND.” 6. Replace the blower access panel. 208-Volt Conversion 1. Disconnect all power supplies. 2. Remove the air handler access panel. 3. Move the 2 connected black transformer leads from the 240-volt terminal on the transformer to the 208-volt terminal on the transformer. See “Wiring Diagram—Electric Heat and Blower” in the “Make Electrical C
Whirlpool WAHU, 10 4. Connect appropriate size wire to the circuit breaker terminals. If circuit breakers are not provided, a terminal block is provided. 5. Connect green ground wire(s) (1, 2, or 3) to ground terminal(s) (1, 2, or 3) marked “GND.” Connect to Circuit Breaker NOTE: There are 2 ground terminals marked “GND” shown here. There may be 1, 2 or 3 ground terminals depending on the number of circuit breakers. Connect to Terminal Block 6. Install conduit opening plugs in any unused openings. 7. If circuit breakers or pull disconnects are used, the fro
11 Low Voltage Connections R G BU Thermostat Air Handler Condensing Unit Cooling Only Application Heat Only Application Thermostat Air Handler Air Handler Air HandlerThermostat Thermostat R R R G G G BU BU W W W Heat Pump Unit BK BK Cooling Application with Electric Heat Heat Pump Application with Electric Heat Condensing Unit Connect common wire only if required. See therm
Whirlpool WAHU, 12 Wiring Diagram - Electric Heat and Blower 15 Amp Supply Voltage L1 L2 OR N Wiring Diagram: No Heat Wire Nuts By Others 14 G 2 14 BK 1 To Ground Lug 14 Y (240V) 14 W (120V) 6-Pin Plug 18 R 18 BU 14 R 18 BK 18 G 18 BU 4 BR 6 2 5 3 1 TR 14 BK 240V 18 BU 208V COM 24V 14 BK L1 14 Y L2 BK 18 R 18 G R G 18 W 18 BU C W1 To Thermostat By Others R G W BU W2 CAP = Motor Capacitor GND = Ground Connection MTR = Blower Motor BR = Blower Relay TD = Time Delay (Opt.) TR = Transformer SEQ = Sequencer CB = Circuit Breaker GN
Whirlpool WAHU, 13 Complete Installation NOTE: Refer to outdoor unit installation instructions for system start-up instructions and refrigerant charging instructions. Pre-Start Check ■ Is unit properly located, level, secure, and serviceable? ■ Has an auxiliary pan been provided under the unit with separate drain for units installed above a finished ceiling or in any installation where condensate overflow could cause damage? ■ Have all webs been removed from the drain connections that are being used? Have all dr
Whirlpool WAHU, 14 SEQUENCE OF OPERATION Cooling (cooling only or heat pump) When the thermostat calls for cooling, the circuit between R and G is completed, and the blower relay is energized. The Normally Open contacts close, causing the indoor blower motor to operate. The circuit between R and Y is also completed; this circuit closes the contactor in the outdoor unit starting the compressor and outdoor fan motor. Circuit R and O energizes the reversing valve, switching it to the cooling position. (The reversing valve remains energized as long as selector switch is in the COOL posit
Keep this book and your sales slip together for future reference. You must provide proof of purchase or installation date for in-warranty service. Write down the following information about your air handler to better help you obtain assistance or service if you ever need it. You will need to know the complete model and serial number. You can find this information on the air handler rating
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