Instruction manual

phase units, connect leads to the black and yellow wires; for
3-phase units, connect the leads to the black, yellow, and blue
wires. (See Fig. 18)
C. CONNECTING GROUND LEAD TO GROUND LUG
Refer to Fig. 18. Connect the ground lead to the chassis using the
ground lug in the wiring splice box.
D. ROUTING CONTROL POWER WIRES (24-V)
Form a drip-loop with the thermostat leads before routing them
into the unit. Route the thermostat leads through grommeted,
low-voltage hole provided in unit into unit control power splice
box. (See Fig. 2 and 3) Connect thermostat leads to unit control
power leads as shown in Fig. 17.
The unit transformer supplies 24-v power for complete system
including accessory electrical heater. An automatic-reset circuit
breaker (See Fig. 19) is provided in the 24-v circuit; see the caution
label on the transformer or Fig. 20. Transformer is factory wired
for 230-v operation. If supply voltage is 208-v, rewire transformer
primary as described in Special Procedures for 208-v Operation
section.
E. SPECIAL PROCEDURES FOR 208-V OPERATION
1. Be sure unit disconnect switch is open.
2. Disconnect the yellow primary lead (w 110) from the
transformer. See unit wiring label. (See Fig. 13 and 14)
3. Connect the yellow primary lead (w110) to the transformer
terminal labeled 200-v.
Indoor blower-motor speeds may need to be changed for 208-v
operation. Refer to indoor airflow and airflow adjustments section.
Fig. 10—Typical Installation
C00063
INDOOR
THERMOSTAT
DISCONNECT
PER NEC*
FROM
POWER
SOURCE
RETURN
AIR
TOP COVER
*NEC - NATIONAL ELECTRICAL CODE
Fig. 11—602B with Duct Covers On
C00092
Duct Covers
Fig. 12—Condensate Trap
C99013
1” MIN.
2” MIN.
TRAP
OUTLET
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