PTC HEATER CONSTRUCTION [MANUAL AIR CONDITIONER]
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• The PTC heater is supplementary heater to assist A/C unit heating performance.
System wiring diagram
Operation
• The PTC heater relay will turned ON when all of the following conditions are met:
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― Blower fan ON.
― Set temperature is MAX HOT.
― Ambient temperature is included in definite value. (See Graph 1.)
― Engine coolant temperature is included in definite value. (See Graph 2.)
