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HEAT PUMP THERMOSTAT
3 69-1043-2
Fig. 2. Internal schematic and typical wiring diagram for T841A with AUX. HT. and EM. HT. LEDs. Provides heat
or cool changeover relay control and automatic fan in emergency heat mode.
Fig. 3. Internal schematic and typical wiring diagram for T841B 2-stage heat, 1-stage cool, manual changeover.
L1
(HOT)
L
2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE W1-Y1 JUMPER WHEN HEAT RELAY 1 IS USED.
WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR, EM. HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION.
X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION.
1
2
3
4
H2 ANTICIPATOR
H2
FALL
H1
C1
FALL
H1 ANTICIPATOR
C1 ANTICIPATOR
SYSTEM
SWITCH
HEAT
OFF
COOL
FAN SWITCH
AUTO
ON
EM. HT.
COMPRESSOR
CONTACTOR
FAN RELAY
EM. HT.
RELAY
EM. HT.
LED (RED)
CHANGEOVER
RELAY (HEAT)
AUX. HT.
LED (GREEN)
HEAT RELAY 1
CHANGEOVER
RELAY (COOL)
AUX. HT.
RELAY
JUMPER
SYSTEM
MONITOR
O
L
G
R
E
X
W2
B
W1
Y1
3
4
2
M1103
E
H2
FALL
H1
FALL
C1
L1
(HO
T)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
H1/C1
ANTICIPATOR
H2 ANTICIPATOR
SYSTEM
SWITCH
COOL
OFF
HEAT
COOL CHANGEOVER VALVE
COMPRESSOR
CONTACTOR
FAN RELAY
HEAT CHANGEOVER
VALVE
HEAT RELAY 1
HEAT RELAY 2
FAN SWITCH
AUTO
ON
M6068A
W1
W2
B
G
R
X
Y1
O