Honeywell CHRONOTHERM III T8611M User Manual page 16

T8611M
INSTALLATION
Fig. 8—T8611M Thermostat with EM.HT.-HEAT-OFF-AUTO-COOL system and ON-AUTO fan switching;
EM.HT., CHECK, and AUX. HT. LEDS. Applied to 3-stage heat/2-stage cool system.
Fig. 9—T8611M Thermostat with EM.HT.-HEAT-OFF-AUTO-COOL system and ON-AUTO fan switching,
THERMOSTAT
LOGIC
CIRCUIT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 POSSIBLE CHECK LED CIRCUITS:
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
SOME OLDER HEAT PUMP THERMOSTATS USE X FOR COMMON TERMINAL.
3
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
5
INTERCONNECT CABLE AWAY FROM SOURCES OF ELECTRICAL NOISE.
6 APPLICABLE ONLY ON MODEL WITH REMOTE SENSOR.
7
7
POWER
SUPPLY
SUBBASE
LOGIC/
CONTROL
CIRCUIT
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
AUTO
COOL
HEAT 1
HIGH
LIMIT
S1
S2
S3
5
202905 REMOTE
SENSOR
X2 TO R
CHECK CHECK
FAULT DETECTION
LED LED
SWITCH
(YELLOW) (YELLOW)
X1 TO C
SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
HIGH
LIMIT
FAN
SWITCH
EM. HEAT
LED (RED)
ON
AUTO
HEAT 3
HEAT 2
COOL 1
COOL 2
6
S1
S2
S3
X2 TO R
CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
X1 TO C
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
16
R
4
3
C
AUX. HEAT
MONITOR
LED (GRN)
L
AUXILIARY
HEAT RELAY
W3
W2
EMERGENCY
HEAT RELAY
E
FAN RELAY
G
CHANGEOVER
RELAY (COOL)
O
C.O.
CHANGEOVER
RELAY (HEAT)
B
C.O.
STAGE 1 COMPRESSOR
CONTACTOR
Y
Y2
X2 2
CHECK LED
(YELLOW)
X1
X2
L1
(HOT)
SWITCHING
DEVICE
1
24 Vac
X1
L2
M1019D
1
L1
(HOT)
L2