T8501 MICROELECTRONIC THERMOSTATS

3 69-0925—4

Fig. 4. Typical hookup in heat and cool system with

one transformer.

Fig. 5. Typical hookup in heat and cool system with

two transformers.

.

Fig. 6. Correct wiring technique.

Mounting Thermostat

1. Engage tabs at the top of the thermostat and wall-

plate. See Fig. 7.

2. Press lower edge of case to close and latch.

NOTE: To remove the thermostat from the wall, first pull

out at the bottom of the thermostat; remove top

last.

Fig. 7. Mounting thermostat on wallplate.

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
RO
T
O
T
CBOGYW
OUTDOOR
TEMPERATURE
SENSOR
COOL
CHANGEOVER
VALVE OR
DAMPER
HEAT
CHANGEOVER
VALVE OR
DAMPER
THERMOSTAT
1
2
2
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
RhOTOTOGYCBW
OUTDOOR
TEMPERATURE
SENSOR
COOL
CHANGEOVER
VALVE OR
DAMPER
HEAT
CHANGEOVER
VALVE OR
DAMPER
THERMOSTAT
1
3
2
2
3
1
L1
(HOT)
L2
Rc
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT INSERTION
STRIP 5/16 IN. (8 MM).
M6798
A
B.
PRESS LOWER EDGE OF CASE TO LATCH.
A
.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.