Form O-Y P/N 273647R5, Page 31
If equipped with optional preheat, one or two 10kw electric heat modules are located
in the inlet air stream. Preheat operation is controlled by the system controller and is
commanded ON when the supply air discharge sensor signals a temperature reading
of 33°F (0.56°C).
Optional Frost Control Electric Element
Part Number Voltage
273793 230/1/60
272505 208-230/3/60
272506 460/3/60
272507 575/3/60
Optional Preheat
(frost Control)
Wheel Supply Air
Discharge Sensor
The supply air discharge sensor monitors wheel operation and if equipped with pre-
heat, controls operation of the electric heat module(s). The supply air discharge sen-
sor is a probe sensor located in the wheel discharge.
Service: Check the wiring. If the sensor needs to be replaced, use only a factory
authorized replacement part designed for the purpose.
FIGURE 22 - Location of the Wheel Supply Air Discharge Sensor
Temperature Sensor
in Wheel Supply
Airstream
Temperature Sensor,
P/N 222753
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