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WIRING DIAGRAMS
EMERGENCY
HEAT
RELAY
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).
Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.
10kw and Below, One Stage Electric Heat
BLUE
WHITE
BROWN
BLACK
RED
THERMOSTAT
EMERGENCY
HEAT
RELAY
OT/EHR18-60
15kw and Above, Two Stage Electric Heat
BLUE
WHITE
BROWN
BLACK
RED
THERMOSTAT
OT/EHR18-60
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.
From Air Handler
C
G
W2
R
C
R
W2
O
Y
From Outdoor Unit
From Air Handler
C
G
W2
W3
R
C
R
W2
O
Y
From Outdoor Unit
C
G
W2
E
R
O
Y
SEE NOTE
C
G
W2
E
R
O
Y
103
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