CAUTION:
Do not vent refrigerant to atmosphere. Re-
cover during system repair or final unit disposal.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip-
ment failure, it is essential that periodic maintenance be performed
on this equipment. Consult User’s Manual for the proper frequency
of maintenance. Frequency of maintenance may vary depending
upon geographic areas, such as coastal applications.
Leave User’s Manual with homeowner.
Explain system operation and maintenance procedures outlined in
User’s Manual.
Fig. 6—Typical Circuit Connections
A91327
FACTORY WIRING
FIELD WIRING
OUTDOOR THERMOSTAT
USED WITH FB4, FB5, FC4, FA4, FH4 FAN COILS
USED WITH FB4, FB5, FC4, FA4, FH4 FAN COILS
C
W
2
L
G
Y
E
O
R
THERMOSTAT
SUBBASE
INDOOR
SPLICE
CONNECTION
OUTDOOR
SPLICE
CONNECTION
DEFROST
BOARD
C
W
2
L
G
Y
E
O
R
ODT
THERMOSTAT
SUBBASE
INDOOR
SPLICE
CONNECTION
OUTDOOR
SPLICE
CONNECTION
DEFROST
BOARD
SHR
SHR
EHR
ODT
ODT
EMERGENCY HEAT RELAY
FIELD SPLICE
EHR
ODT
REMOVE WIRES FROM CRIMP NUT IN INDOOR FAN COIL WHEN INSTALLING OUTDOOR THERMOSTATS.
SYSTEMS WITH ONE OUTDOOR THERMOSTAT
SYSTEMS WITH TWO OUTDOOR THERMOSTATS
G
R
W
3
C
W
2
E
O
R
G
R
W
3
C
E
IMPORTANT: WHEN USING OUTDOOR THERMOSTATS, W
2
MUST BE ENERGIZED WHEN REQUESTING
SUPPLEMENTAL HEAT.
C
W
2
Y
W
2
O
R
C
W
2
Y
A91326
W
2
C
L
G
Y
E
O
R
C
W
2
L
G
Y
E
O
R
W
3
C
W
2
L
G
Y/Y
2
E
O
R
THERMOSTAT
SUBBASE
INDOOR
SPLICE
CONNECTION
OUTDOOR
SPLICE
CONNECTION
DEFROST
BOARD
THERMOSTAT
SUBBASE
INDOOR
TERMINAL
BOARD
OUTDOOR
SPLICE
CONNECTION
DEFROST
BOARD
FACTORY WIRING
FIELD WIRING
FIELD SPLICE
USED WITH FD3, FF1, FA4, FB4, FC4, FH4 FAN COILS
USED WITH FK4B FAN COIL
SYSTEMS WITHOUT OUTDOOR THERMOSTATS
Y
1
C
G
R
W
2
C
Y
O
R
W
2
C
Y
O
R
W
2
—5—
