Control Principle Of Electronic Component; Air Escaper; Control Principle Of The Fan Motor; Defrost Control Principle - Haier HRF-633CJB Service Manual

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SERVICE MANUAL

Model: HRF-633CJB

Chapter 5 Control principle of electronic component

(1) The refrigeration air escaper is controlled with the fridge storage temperature sensor R

SNR.

(2) The air escaper is closed from the beginning of defrosting until 15 minutes after the

defrosting is finished.

(3) Upon initial powering on or resetting of the control panel, the air escaper conducts a

close-and-open cycle before acting according to the control conditions in item (1).

(4) The air escaper will be forced to conduct an open-and-close cycle if it has been closed for 1

hour. After that, its closing/opening will be controlled by R SNR.

(5) The air escaper will automaticlly close when fridge door have been opend over 2 minutes.

5-2. Control Principle of the Fan

The freezer fan is controlled by the control panel according to the following conditions. The DC

fan's rotation speed is regulated with PWM mode and the AC fan operates directly.

(1) Upon initial powering on,the freezer fan motor will running before the air escaper in fridge first

close.

(2) When the fridge storage compartment door is opened, the freezer fan will run and the refrigeration

air door will open. After 2 minutes, the refrigeration air door will close;

(3) When the freezer storage compartment door is open, the freezer fan will stop running;

(4) Conditions for judging LOCK of the freezer fan: If the rotation speed of the fan is less than

300RPM or the fan does not run and the state has persisted for over 30 seconds, a freezer fan

malfunction will be displayed. Normal display will be recovered after it becomes normal.

Otherwise the freezer fan malfunction will persist.

5-3. Defrosting Control Principle

(1) A defrosting cycle will be started once the compressor has been operated for 8 hours

accumulatively. It will stop defrosting when the defrosting sensor detects a temperature over 7ºC.

(2) The compressor stops and the refrigeration air door is closed during defrosting.

(3) After initial powering on or resetting of the control panel, it will start the first defrosting cycle after

the compressor has operated for 4 hours accumulatively. If the super freezer function is used,

defrosting will be start after 7 hours compressor running.

(4) It may enter the defrosting state when the defrosting sensor is malfunctiony (short-circuit or

open-circuit). In this case, it will exit the defrosting state after 30 minutes.

Issue 2009-12-24

Rev. Ref0912S024V0

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