Function Of Each Control Element - Chery QQ Service Manual

Chery QQ Service Manual
III. Function of each control element
1.Relay (condensator' fan/electric magnetic clutch)
The relay is used to control condensator fan motor and electric magnetic clutch
respectively. As far as the air conditioning (compressor) is running, the condensator
fan will work continuously.
2.Electric magnetic clutch
The electric magnetic clutch engages so as to start up the compressor only when air
conditioning is turned on. The electric magnetic clutch is controlled by ECU.
3.Thermistor of the evaporator
When the evaporating temperature falls to 1 (34 F) or below, the raditor fin of the
evaporator will frost or freeze, which then results in air flow volume decreasing and
ineffective refrigerating. Thermistor is a kind of sensor for avoiding frosting and icing.
The thermistor fitted in the evaporator converts the vaporating temperature into
resistance value which then is sent to amplifier of the air conditioner.
4.Cooling liquid (water) temperature sensor
When the temperature of the cooling water is too low, the ECU will stop the
compressor by disconnecting the relay of the compressor clutch.
The high-low pressure protection switch is used for control. When the pressure of the
circular refrigerant becomes too low or too high due to leakage or insufficient, the
switch will turn off the compressor.
This high-low pressure protection switch is fitted in the high pressure pipe behind the
stock solution drier.
5.Air conditioner on/off control
Refrigerant high pressure:
Over 3140kpa
(32kg/cm2,455 psi).....off
Below 2250kpa
(26kg/cm2,370psi)...on
refrigerant lower than:
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