ROUTING POWER LEADS INTO UNIT
Use only copper wire between disconnect and unit. The
high-voltage leads should be in a conduit until they enter the duct
panel: conduit termination at the duct panel must be watertight. Run
the high-voltage leads through the power entry knockout on the
power entry side panel. See Fig. 2 and 3 for location and size. When
the leads are inside the unit, run leads up the high-voltage raceway
to the line wiring splice box (see Fig. 12). For single-phase units,
connect leads to the black and yellow wires (see Fig. 12). On all
3-phase units, connect the leads to the black, yellow and blue ,,vires.
CONNECTING GROUND LEAD TO GROUND SCREW
Connect the ground lead to the chassis using the ground screw in the
wiring splice box (see Fig. 11).
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. 11.
The unit transformer supplies 24-v power for complete system
including accessory electrical heater. An automatic-reset circuit
breaker is provided in the 24-v circuit; see the caution label on the
transformer. 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.
SPECIAL PROCEDURES FOR 208v OPERATION
1. Disconnect the yellow primary lead from the transformer.
See unit wiring label (see Fig. 11).
2. Connect the yellow primary lead 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.
©
@
@
@
®
THERMOSTAT
AND SUBBASE
[
l
_BRN--
_ORN--
_RED--
_GRN_
UNIT CONTROL POWER
SPLICE BOX
C99056
Fig. 11 - Control Connections
GROUND SCREW
(IN SPLICE BOX)
SINGLE-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC
GROUND
LEAD
L1 _BLK--
L2 ........ /Q---- YEL--
3-PHASE L3 _BLU--
CONNECTIONS
NOTE: Use copper wire only.
LEGEND
NEC - National Electrical Code
Field Wiring
Splice Connections
099057
Fig. 12 - Line Power Connections
24V Circuit Breaker
24 Volt CornI
Fig. 13 - Control Wiring Plate
PRE- START - UP
C99070
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death and/or property damage.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Relieve and recover all refrigerant from system before
touching or disturbing anything inside terminal box if
refrigerant leak is suspected around compressor terminals.
3. Never attempt to repair soldered connection while
refrigerant system is under pressure.
4. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
5. To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install lockout
tag.
b. Relieve and reclaim all refrigerant from system
using both high- and low-pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to flame.
Proceed as follows to inspect and prepare the unit for initial start-up:
1. Remove all access panels.
i0
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