INSTALLATION INSTRUCTIONS
3-phase R-22 Split System Heat Pump
10
506 01 5001 00
Thermostat Wiring Connections
Route thermostat wiring through rubber grommet in
bottom 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 13 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 measured along the control voltage wires, use No.
16 AWG color-coded wires to avoid excessive voltage
drop.
Figure 13
Typical Thermostat (Control Circuit) Connections
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
SUPPLEMENTAL HEAT RELAY
SHR
EHR
C
W
2
L
G
Y
E
O
R
C
W
2
L
G
Y
E
O
R
ODT
EHR
ODT
ODT
REMOVE WIRES FROM CRIMP NUT IN INDOOR FAN COIL WHEN INSTALLING OUTDOOR THERMOSTATS.
SYSTEMS WITH ONE OUTDOOR THERMOSTAT
G
R
W
3
C
O
R
G
R
W
3
C
E
C
W
2
Y
W
2
O
R
C
W
2
Y
W
2
C
L
G
Y
E
O
R
SYSTEMS WITHOUT OUTDOOR THERMOSTATS
C
G
R
W
2
C
Y
O
R
W
2
SUBBASE
THERMOSTAT
CONNECTION
SPLICE
INDOOR
CONNECTION
SPLICE
OUTDOOR
BOARD
DEFROST
SUBBASE
THERMOSTAT
CONNECTION
SPLICE
INDOOR
CONNECTION
SPLICE
OUTDOOR
BOARD
DEFROST
SUBBASE
THERMOSTAT
CONNECTION
SPLICE
INDOOR
CONNECTION
SPLICE
OUTDOOR
BOARD
DEFROST
SYSTEMS WITH TWO OUTDOOR THERMOSTATS
NOTE:
WHEN USING OUTDOOR THERMOSTATS, W
2
MUST BE ENERGIZED WHEN REQUESTING SUPPLEMENTAL HEAT.
W
2
E
SHR
SHR
