Chery S11 / Chery QQ. Manual — part 72

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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Chery QQ Service Manual

below 196kpa

(2.0 kg/cm2,28.4psi)….off

over 226kpa

(2.3kg/cm2,32.7psi)…on

Engine cooling water temperature

Over 110(230℃)…off

Below 103(230℃)…on

When starting engine makes the engine start…off

Evaporator temperature:

When the air conditioner’s switch on

Over 2.5(36.5℉)…off

Below 4.0(39.2℉)…on

When accelerating quickly

(air throttle opening is up to 90% within 10 s)

IV. Engine computer air conditioning circuit diagram

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1、

principle of operation:

When startup a car, the ignition cell (+)12V will supply power to ECU, duty relay

and the main relay coil respectively, the duty relay closes and ECU makes the main

relay close after receiving the ignition signal.

+12V from the duty relay switch is divided into two lines. One line supplies power to

defroster via F15(15A) to the back defrosting switch and grounds by connecting the

back defrosting switch indicator. When the defrosting switch is on the back defroster

will work normally. Connects the switch of the air blower and select different gear,

the air blower will work at that gear. When close the air blower switch and the A/C

switch singnal will be sent to ECU, then the air conditioner relay operates after the

ECU receiving the signal and now the compressor works normally.

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