Honeywell CHRONOTHERM III T8611M - Page 14

14
STAGE 2 COMPRESSOR
CONTACTOR
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.
APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
M1017D
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
MONITOR
AUXILIARY
HEAT RELAY
HEAT 2
L1
(HOT)
L2
HEAT
OFF
AUTO
SYSTEM
SWITCH
COOL 1
COOL 2
AUTO
ON
FAN
SWITCH
7
1
R
C
L
W3
W2
E
G
O
B
Y
Y2
X2
STAGE 2
HEAT RELAY
EMERGENCY
HEAT RELAY
FAN RELAY
CHANGEOVER
RELAY (HEAT)
STAGE 1 COMPRESSOR
CONTACTOR
3
C.O.
EM. HT.
COOL
X1
CHANGEOVER
RELAY (COOL)
AUX. HEAT
LED (GRN)
HEAT 3
EM. HEAT
LED (RED)
HIGH
LIMIT
C.O.
HEAT 1
HIGH
LIMIT
CHECK LED
(YELLOW)
2
S1
S2
S3
S1
S2
S3
A
A
A
A
A
A
202905 REMOTE
SENSOR
5
SUBBASE
LOGIC/
CONTROL
CIRCUIT
THERMOSTAT
LOGIC
CIRCUIT
POWER
SUPPLY
4
6
6
7
terminals (Fig. 7) to assure thermostat/subbase contact.
T8611M
INSTALLATION