INSTALLATION INSTRUCTIONS
R
−
410A Split System Air Conditioner
421 01 5100 01
9
ELECTRICAL WIRING
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to turn off the main (remote) electrical dis-
connect device could result in personal injury or
death.
Before installing, modifying or servicing system,
turn OFF the main (remote) electrical disconnect
device. There may be more than one disconnect
device.
The supply voltage must be 208/230 volts (197 volt mini-
mum to 253 volts maximum) 60 Hz single phase.
Outdoor units are approved for use with copper conduc-
tors only. Do not use aluminum wire.
Refer to unit rating plate for minimum circuit ampacity and
circuit protection requirements.
Grounding
Permanently ground unit in accordance with the National
Electrical Code and local codes or ordinances. Use a cop-
per conductor of the correct size from the grounding lug in
control box to a grounded connection in the service panel
or a properly driven and electrically grounded ground rod.
Wiring Connections
Make all outdoor electrical supply (Line Voltage) connec-
tions with raintight conduit and fittings. Most codes re-
quire a disconnect switch outdoors within sight of the unit.
Consult local codes for special requirements.
Route electrical supply (Line Voltage) wiring through
knockout hole in bottom of Control Box. Connect wires to
Contactor and Ground Lug according to Wiring Diagram
on unit. Also refer to Figure 10.
Route thermostat wiring through rubber grommet in bot-
tom of Control Box. Low voltage lead wires are provided in
the control box for connection to thermostat wires (use
wire nuts). Refer to Wiring Diagram on unit and Figure 11
for low voltage wiring examples.
NOTE:
Use No. 18 AWG (American Wire Gage) color
−
coded, insulated (35
°
C minimum) wire. If thermostat is
located more than 100 feet (30.5 m) from unit as mea-
sured along the control voltage wires, use No. 16 AWG
color
−
coded wires to avoid excessive voltage drop.
Figure 10
Electrical Supply (Line Voltage)
Connections
DISCONNECT
PER NEC AND/OR
LOCAL CODES
CONTACTOR
GROUND
LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
11
23 or 13
L1
L2
Figure 11
Typical Thermostat Connections
24 VAC HOT
24 VAC COM
R
C
G
W/W1
Y/Y2
R
C
C
THERMOSTAT
FURNACE
Y
G
W
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
AIR CONDITIONER
24 VAC HOT
24 VAC COM
R
C
G
W/W1
Y/Y2
R
C
C
THERMOSTAT
FAN COIL
Y
G
W2
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
AIR CONDITIONER
START
−
UP PROCEDURE
1. Set indoor thermostat selector switch to OFF.
2. Turn ON all electrical disconnect devices.
3. If unit has a crankcase heater, energize the heater
and wait 24 hours before proceeding.
4. Set indoor thermostat at desired temperature. Be
sure setpoint is below indoor ambient temperature
or thermostat will not call for cooling.
5. Set indoor thermostat selector switch to COOL.
Operate unit for minimum 10 minutes, then check
the system refrigerant charge.