HVAC SYSTEM-AC COMPRESSOR 152 INTRODUCTION: Air conditioning is the regulation of air flow, temperature and humidity in the car for providing comfortable environment to the occupants. The comfort of the environment in the car will be defined in terms of temperature, humidity and air flow. But this degree of comfort will vary with the outside conditions such as temperature, relative humidity etc. For maintaining a comfortable environment (climate) in the car cabin, two separate temperature regulated circuits and the corresponding controlling elements are required i.e. refrigeration and heating circuits. This system provides full heating, ventilation and cooling of the car interior. The controls on the dash boards can be adjusted to mix heating and cooling to get the desired effect inside the car. This manual provides information on operation, maintenance and trouble shooting of HVAC / A/C system. Compressor is the heart of A/C system specially designed to compress the refrigerant. The compressor draws vaporized refrigerant from the evaporator. It compresses the refrigerant (resulting into temperature rise of refrigerant) and the refrigerant will be passed onto condenser for condensation. Compressor relay operate the compressor magnetic clutch. The magnetic clutch continues to operate as long as air conditioner is under operation. Once the air conditioner is put in ‘OFF’ condition, the compressor relay gets cut off and the magnetic clutch gets disengaged from the compressor. The cut - in and cut - off of relay is governed by ECU.
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