Honeywell CHRONOTHERM III T8611G User Manual page 4

Fig. 5—T8611R 2-stage heat/1-stage cool thermostat.
3
POWER
SUPPLY
SUBBASE
THERMOSTAT
LOGIC/
LOGIC
CONTROL
CIRCUIT
CIRCUIT
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2 REMOVE JUMPER FOR SYSTEM WITH ISOLATED STAGE 1 HEATING AND COOLING CONNECTIONS.
3 DENOTES THERMOSTAT TO SUBBASE INTERCONNECT.
HIGH
LIMIT
FAN
SWITCH
ON
AUTO
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
HIGH
LIMIT
COOL
AUX. HEAT
EM. HEAT
LED (GRN)
LED (RED)
HEAT 2
HEAT 1
4
1
L1
L2
(HOT)
R
C/X
L
MONITOR
W2
AUXILIARY
HEAT RELAY
E
EMERGENCY
HEAT RELAY
W1
STAGE 1
HEAT RELAY
G
FAN RELAY
2
O
CHANGEOVER
RELAY (COOL)
B
CHANGEOVER
RELAY (HEAT)
Y1
COMPRESSOR
CONTACTOR
P
DEFROST
CONTROL
M 6019