Service manual

50
TO AVOID POSSIBLE ELECTRICAL SHOCK, PERSONAL INJURY,
OR DEATH, DISCONNECT THE POWER BEFORE SERVICING.
WARNING
!
ACCESSORIES WIRING DIAGRAMS
EMERGENCY
HEAT
RELAY
13 42
BLUE
WHITE
BLACK
BROWN
THERMOSTAT
OT/EHR18-60 #2
2
1
From Air Handler
CGW2 R
CRW2OY
From Outdoor Unit
C
G
W2
E
R
O
Y
Indoor Thermostat
W3
W3
B
L
UE
GREEN
WHI
T
E
RED
BROWN
B
L
UE
R
E
D
W
H
IT
E
ORAN
G
E
YELLOW
15kw and Above with Two OT/EHR18-60's, Two Stage Electric Heat and Two Stage Thermostat
HEAT
RELAY
EMERGENCY
THERMOSTAT
1 4
3 2
1
2
BROWN
BLACK
WHITE
BLUE
OT/EHR18-60 #1
RED
RED
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.