69-0959
3
T8501A,B,C,D MICROELECTRONIC THERMOSTATS
Fig. 3. Typical hookup in heat only application.
Fig. 4. Typical hookup in heat and cool
system with one transformer.
Mounting Thermostat
쐃
Engage tabs at the top of the thermostat and
wallplate. See Fig. 7.
쐇
Press lower edge of case to close and latch.
Fig. 5. Typical hookup in heat and cool
system with two transformers.
Fig. 6. Proper wiring technique.
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
AVAILABLE ON SELECT MODELS.
1
HEATING
RELAY OR
VALVE COIL
M4821
COMPRESSOR
CONTACTOR
FAN
RELAY
R
O
T
O
T
C
B
O
G
Y
W
OUTDOOR
TEMPERATURE
SENSOR
COOL
CHANGEOVER
VALVE OR
DAMPER
HEAT
CHANGEOVER
VALVE OR
DAMPER
THERMOSTAT
1
2
2
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
AVAILABLE ON SELECT MODELS.
JUMPER Rh TO Rc IN A SINGLE TRANSFORMER SYSTEM.
1
HEATING
RELAY OR
VALVE COIL
M4820
COMPRESSOR
CONTACTOR
FAN
RELAY
Rh
O
T
O
T
O
G
Y
C
B
W
OUTDOOR
TEMPERATURE
SENSOR
COOL
CHANGEOVER
VALVE OR
DAMPER
HEAT
CHANGEOVER
VALVE OR
DAMPER
THERMOSTAT
1
3
2
2
3
1
L1
(HOT)
L2
Rc
L1
(HOT)
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
AVAILABLE ON SELECT MODELS.
1
HEATING
RELAY OR
VALVE COIL
M4822
R
O
T
O
T
C
W
OUTDOOR
TEMPERATURE
SENSOR
THERMOSTAT
1
2
2
