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ACCESSORIES WIRING DIAGRAMS
75
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THIS
UNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
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
BLUE
GR
EEN
W
H
ITE
R
E
D
BROWN
BL
UE
RED
WH
ITE
O
RANGE
YEL
L
O
W
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.