Honeywell CHRONOTHERM III T8611M User Manual page 14

T8611M
INSTALLATION
terminals (Fig. 7) to assure thermostat/subbase contact.
THERMOSTAT
LOGIC
CIRCUIT
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
POSSIBLE CHECK LED CIRCUITS:
2
X2
CHECK
LED
(YELLOW)
X1
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
3
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.
4
RECOMMENDED INTERCONNECT CABLE: 18-GAUGE THERMOSTAT CABLE, 200 ft. [61 m] MAXIMUM LENGTH. ROUTE INTERCONNECT
5
CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.
APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.
6
7 DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
7
POWER
SUPPLY
SUBBASE
LOGIC/
CONTROL
CIRCUIT
EM. HT.
HEAT
OFF
AUTO
COOL
HEAT 1
HIGH
LIMIT
S1
S2
S3
5
202905 REMOTE
SENSOR
TO R X2
CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
TO C
X1
SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER
HIGH
LIMIT
FAN
SWITCH
EM. HEAT
ON
LED (RED)
AUTO
HEAT 3
SYSTEM
SWITCH
COOL 1
6
S1
S2
S3
TO R X2
CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
TO C
X1
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
14
R
4
3
C
AUX. HEAT
LED (GRN)
MONITOR
L
AUXILIARY
HEAT RELAY
W3
STAGE 2
HEAT RELAY
W2
HEAT 2
EMERGENCY
HEAT RELAY
E
FAN RELAY
G
CHANGEOVER
RELAY (COOL)
O
C.O.
CHANGEOVER
RELAY (HEAT)
B
C.O.
STAGE 1 COMPRESSOR
CONTACTOR
Y
STAGE 2 COMPRESSOR
CONTACTOR
Y2
COOL 2
X2
2
CHECK LED
(YELLOW)
X1
L1
(HOT)
SWITCHING
DEVICE
1
24 Vac
L2
1
L1
(HOT)
L2
M1017D