3
WIRING AND OPERATION (cont.)
All wiring should be done in accordance with local and national electrical codes and ordinances.
WIRING
Line Voltage Low Voltage
Line Voltage Field Low Voltage Field
OPERATION
Heating
As the “Heat” contacts of the thermostat close, bimetal heater
#1 is energized. Approximately 45 seconds later, the warping
action of bimetal heater #1 closes line voltage switch #1 to en-
ergize the heating load. When the "Heat" contacts open, heater
#1 cools for approximately 45 seconds before switch #1 opens
to de-energize the heating load.
Cooling
As the "Cool" contacts of the thermostat close, bimetal heater
#2 is energized. Approximately 45 seconds later, the warping
action of bimetal heater #2 closes line voltage switch #2 to en-
ergize the cooling load. When the "Cool" contacts open, heater
#2 cools for approximately 45 seconds before switch #2 opens
to de-energize the cooling load.
Fig. 3. Using Heating-Cooling Thermostat to
Operate Heating and Cooling Loads
YORW
TYPE 1F36 HEATING-COOLING THERMOSTAT
FIXED
COOLING
ANTICIPATOR
THERMOSTAT
SWITCH
BIMETAL
HEAT
ADJUSTABLE
HEATING
ANTICIPATOR
TYPE 24A06 DUAL LEVEL TEMP
WHITE
BLACK W/
WHITE STRIPE
RED
BIMETAL
HEATER #2
BIMETAL
HEATER #1
SWITCH #1
SWITCH #2
TRANSFORMER
HEATING
LOAD #1
RED
BLACK
BLUE
L1
L2
LINE
BLACK W/RED STRIPE
RED W/BLACK STRIPE
COOLING
LOAD
L1
L2
LINE
