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12.4 Electrical Connections – Supply Voltage
IMPORTANT NOTE: USE COPPER CONDUCTORS ONLY.
Knockouts are provided on the air handler top panel and sides of the
cabinet to allow for the entry of the supply voltage conductors, as shown
in Figure 13. If the knockouts on the cabinet sides are used for electri-
cal conduit, an adapter ring must be used in order to meet UL1995
safety requirements. An NEC or CEC approved strain relief is to be
used at this entry point. Some codes/municipalities require the supply
wire to be enclosed in conduit. Consult your local codes.
12.4.1 Air Handler Only (Non-Heat Kit Models)
The building supply connects to the stripped black and red wires con-
tained in the air handler electrical compartment cavity. A ground screw
is also contained in this area. Attach the Supply wires to the air han-
dler conductors as shown in the unit wiring diagram using appropri-
ately sized solderless connectors or other NEC or CEC approved means.
12.4.2 Air Handler - Non-Circuit Breaker Heat Kits
A terminal block is provided with the HKS kit to attach the power supply and air handler connections. Follow the HKS
Installation Manual and wiring diagram for complete wiring details.
12.4.3 Air Handler With Circuit Breaker Heat Kit
The air handler has a plastic cover on the upper access panel that will require either one or both sections to be
removed to allow the heat kit circuit breaker(s) to be installed. The circuit breakers have lugs for power supply
connection. See the HKS Installation Instructions for further details.
12.5 Low Voltage Connections
Several combinations of low voltage schemes are possible, depending on the presence of a heat kit and whether the
heat kit is single-stage or multi-stage, whether the outdoor section is an air conditioner or heat pump, and whether the
outdoor section is single-stage or two-stage. The 24V-control voltage connects the air handler to the room thermostat
and condenser. Low voltage wiring must be copper conductors. A minimum of 18AWG must be used for installations
up to 100 feet. Low voltage wiring must be connected through the top of the cabinet or either side. See the "Thermo-
stat Wiring" section of this manual for typical low voltage wiring connections.
12.5.1 Thermostats
Second-stage heat can be accomplished by a multi-stage heating thermostat or the addition of an outdoor thermostat
as shown in wiring schematics on pages 14 and 15. Follow the thermostat manufacturer's instructions for installation.
12.6 Speed Tap Adjustment
ARUF**14** and ARPT**14** air handlers have multi-speed PSC motors. The color of the wire coming from the motor
to the "COM" terminal on the control board defines at which speed the motor will operate. Black wire is high speed,
blue wire is medium speed and red wire is low 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.
ASPT**14** and ASUF**14** air handlers feature energy efficient blower motors. The motors run at a constant torque
with very low power consumption and are energized by 24 VAC. Adjust the CFM by changing the 24 VAC leads to the
desired speed tap on the terminal block. The ASPT blower motor speeds are 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.
NOTE: In some models, not all speed taps are allowable for certain electric heat applications. Refer to air handler
Series and Ratings plate for minimum speed.
Top of
Cabinet
13
KNOCK-OUT FOR ELECTRICAL
CONNECTIONS
Figure 13
Side of
Cabinet
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