Off-road air conditioning control

Details Off-road air conditioning control Off-road air conditioning control

1993-06-09

1996-02-13

Ford, John K.

Heat exchange

Movable heating or cooling surface

Rotary drum

165 43, 622283, 622281, 62230, 62229, F25B 2900

Patent

active

054905567

ABSTRACT:
Apparatus for heating and cooling an enclosed operator space in an off-road vehicle controlling evaporator fan speed, compressor clutch and condenser fan operation, and having sensors for detecting operator space temperature and an evaporator freezing condition, the condenser fan motor fuse condition, and under or over pressure conditions in the compressor; the apparatus also controls the operation of a heat source such as a heat valve in a coolant path or an electric resistance heater. The evaporator fan speed is controlled by pulse-width modulating power to the fan motor and speed is displayed by a bar graph; a digital display of temperature and system diagnostics is also provided. Operation of the clutch is inhibited when the evaporator freezes.

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