8
CONNECTING GROUND LEAD TO UNIT GROUND
Connect the ground lead to the chassis using the unit ground in the
control box.
HIGH-VOLTAGE POWER
WIRING ENTRY HOLE
LOW-VOLTAGE WIRING
ENTRY HOLE
(grommet hole)
A08407
Fig. 9 -- Unit Electrical Connection
Electric Heat wiring
interconnection (electric
heater controls removed
for clarity)
Electric Heat Control Box
(shown uninstalled)
A10030
Fig. 10 -- Control Box Wiring
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 hole
provided in unit into unit control box (See Fig. 9). Connect
thermostat leads and unit power leads as shown in Fig. 11 and Fig.
12.
Route thermostat wires through grommet providing a drip--loop at
the panel. Connect low--voltage leads to the thermostat as shown in
Fig. 11.
The unit transformer supplies 24--v power for complete system
including accessory electrical heater. Transformer is factory wired
for 230--v operation.
Unit main harness contains a 3 amp automotive style replaceable
fuse. If transformer secondary voltage is not available at red and
brown leads in unit low voltage box, check fuse in red lead near
transformer. Replace with Littelfuse brand, part number 257003.
SINGLE-PHASE
CONNECTIONS
TO DISCONNECT
PER NEC
GROUND
LEAD
UNIT GROUND
BLK
YEL
L
L
EQUIP GR
A10022
Fig. 11 -- Line Power Connections
Unit main harness also contains a 1k ohm, 3 watt load resistor
wired across low voltage leads “G” and “C”. Purpose of resistor is
to provide a small electrical load for the indoor thermostat fan
circuit to ensure reliable operation.
ACCESSORY ELECTRIC HEAT WIRING
Refer to accessory electric heat installation instructions for
information on installing accessory electric heat. Accessory electric
heat wiring is shown in Fig. 14.
PRE--START--UP
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 compressor plug 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 torch
flame.
!
WARNING
Proceed as follows to inspect and prepare the unit for initial
start--up:
1. Remove all access panels.
2. Read and follow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with unit.
PA
3Z
B