GSZH5 Service Manual

106
WIRING DIAGRAMS
HIGH VOLTAGE! D
ISCONNECT ALL POWER BEFORE SERVICING
OR INSTALLING THIS UNIT.
M
ULTIPLE
POWER SOURCES MAY BE PRESENT. FAILURE TO DO SO MAY
CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
EMERGENCY
HEAT
RELAY
1 3
4 2
BLUE
WHITE
BLACK
BROWN
THERMOSTAT
OT/EHR18-60
21
From Air Handler
C G W2 R
C R W2 O Y
From Outdoor Unit
C
G
W2
E
R
O
Y
Indoor Thermostat
BLUE
GREEN
WHITE
RED
BLUE
RED
WHITE
ORANGE
YELLOW
10kw and Below, One Stage Electric Heat
RED
EMERGENCY
HEAT
RELAY
1 4 2
BLUE
WHITE
BLACK
BROWN
THERMOSTAT
OT/EHR18-60
2
1
From Air Handler
C G W2 R
C R W2 O Y
From Outdoor Unit
C
G
W2
E
R
O
Y
Indoor Thermostat
W3
BLUE
GREEN
WHITE
RED
BROWN
BLUE
RED
WHITE
ORANGE
YELLOW
15kw and Above, Two Stage Electric Heat
3
RED
SEE NOTE
Note:
When using a Thermostat with only one
stage for electric heat (W2), tie white and
brown wires from air handler together.
Typical Wiring Schematics for OT/EHR18-60 (Outdoor Thermostat & Emergency Heat Relay).
This wiring diagram is for reference only. Not all wiring is as shown above.
Refer to the appropriate wiring diagram for the unit being serviced.