T8141A ELECTRONIC HEAT PUMP THERMOSTATS
68-0169—1
5
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
ON SOME MODELS, EM. HEAT LED IS LABELED
GEO LOCK AND C TERMINAL IS LABELED X.
ON SOME MODELS, SYSTEM SWITCH IS LABELED
EM. HEAT-GEO HEAT-OFF-GEO COOL.
R
C
W2
E
G
Y
O
TRANSFORMER
COMPRESSOR
RELAY
EM. HEAT RELAY
FAN RELAY
AUX. HEAT
RELAY
COOL CHANGEOVER
VALVE
B
HEAT CHANGEOVER
VALVE
L
SYSTEM MONITOR
M7777A
E
H
O
O
C
E
H
O
C
E
H
O
C
E
H
O
C
A
EM. HEAT
HEAT
OFF
COOL
SYSTEM
SWITCH
FAN
SWITCH
ON
AUTO
EM. HEAT
(RED)
AUX. HEAT
(GREEN)
FAN/COMPRESSOR/
HEAT RELAY
AUX. HEAT
RELAY
THERMOSTAT
LOGIC
POWER
SUPPLY
TEMPERATURE
SENSOR
INTERNAL SYSTEM SWITCHES DESIGNATED AS:
E-EM. HEAT, H-HEAT, O-OFF, C-COOL.
INTERNAL FAN SWITCHES DESIGNATED AS:
O-ON, A-AUTO.
ON SOME MODELS W2 TERMINAL IS LABELED W
AND L TERMINAL IS LABELED X.
2
2
3
3
4
4
5
5
(X)
(X)
(W)
6
6
6
Fig. 5. Heat and cool changeover hookup.