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15 68-0076—1
Fig. 7—Restrict wiring to recessed area surrounding terminals.
T8611M
INSTALLATION
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
POSSIBLE CHECK LED CIRCUITS:
SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL.
NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C TERMINALS FOR THERMOSTAT OPERATION.
RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE
INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.
1
2
3
4
5
X2
X1
CHECK
LED
(YELLOW)
FAULT DETECTION
SWITCH
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
TO R
TO C
X2
X1
CHECK
LED
(YELLOW)
FAULT DETECTION
SWITCH
SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER
TO R
TO C
X2
X1
CHECK
LED
(YELLOW)
SWITCHING
DEVICE
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
L1
(HOT)
L2
24 Vac
1
M1018D
HEAT 2
L1
(HOT)
L2
HEAT
OFF
AUTO
SYSTEM
SWITCH
COOL 1
COOL 2
AUTO
ON
FAN
SWITCH
4
1
R
C
L
W3
W2
E
G
O
B
Y
Y2
X2
MONITOR
STAGE 2
HEAT RELAY
EMERGENCY
HEAT RELAY
FAN RELAY
CHANGEOVER
RELAY (HEAT)
STAGE 1 COMPRESSOR
CONTACTOR
STAGE 2 COMPRESSOR
CONTACTOR
3
C.O.
EM. HT.
COOL
X1
CHANGEOVER
RELAY (COOL)
EM. HEAT
LED (RED)
HIGH
LIMIT
C.O.
HEAT 1
HIGH
LIMIT
CHECK LED
(YELLOW)
2
S1
S2
S3
S1
S2
S3
202905 REMOTE
SENSOR
5
SUBBASE
LOGIC/
CONTROL
CIRCUIT
THERMOSTAT
LOGIC
CIRCUIT
POWER
SUPPLY
6
7
7
6
AUX. HEAT
LED (GRN)
HEAT 3