Wiring And Powering - Honeywell CHRONOTHERM III T8611G User Manual

Fig. 4—T8611G 2-stage heat/1-stage cool thermostat.
2
POWER
SUPPLY
SUBBASE
THERMOSTAT
LOGIC/
LOGIC
CONTROL
CIRCUIT
CIRCUIT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
3 POSSIBLE CHECK LED CIRCUITS:
X1
CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
X2
SWITCH TO R (POWER) SIDE OF
SYSTEM TRANSFORMER
FAN
SWITCH
ON
AUTO
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
AUTO
COOL
HIGH
LIMIT
HEAT 1
X1
TO R
CHECK
FAULT DETECTION
LED
SWITCH
(YELLOW)
X2
TO C/X
SWITCH TO C (COMMON) SIDE
OF SYSTEM TRANSFORMER
HIGH
LIMIT
EM. HEAT
LED (RED)
COOL
X1
TO R
CHECK
SWITCHING
LED
DEVICE
(YELLOW)
24 Vac
TO C/X X2
SWITCH IN SECONDARY OF
SEPARATE TRANSFORMER
3
R
C/X
AUX. HEAT
LED (GRN)
L
MONITOR
W2
HEAT 2
AUXILIARY
HEAT RELAY
E
EMERGENCY
HEAT RELAY
G
FAN RELAY
C.O.
O
CHANGEOVER
C.O. RELAY (COOL)
B
CHANGEOVER
RELAY (HEAT)
Y
COMPRESSOR
CONTACTOR
X1
CHECK LED
3
(YELLOW)
X2
L1
(HOT)
1
L2
1
L1
L2
(HOT)
M 6020
69-0348—1