Control Principle Of Electronic Component; Air Escaper; Control Principle Of The Fan Motor; Principle - Haier AFL631 series Service Manual

SERVICE MANUAL
Model: AFL631 & CFE633
Chapter 5 Control principle of electronic component

5-1. Air Escaper

(1) The refrigeration air door is controlled with the fridge storage temperature sensor R SNR.
(2) The air door 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 door conducts a
close-and-open cycle before acting according to the control conditions in item (1).
(4) The air door 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) If the temperature is still rising (or dropping) within 10 minutes after opening (or closing) of
the air door, it will open (or close) once again.
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) ON/OFF condition of the freezer fan (The control mode of the DC fan is listed in the table below.
The AC fan runs under condition ON and stops running under condition OFF):
(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 not run;
(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.
5-2. Defrosting Control Principle
(1) A defrosting cycle will be started once the compressor has operated for 8 hours accumulatively. It
will stop defrosting when the defrosting sensor detects a temperature over 10ºC.
(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 6 hours accumulatively.
(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 200905
Rev. Ref0905S003V0
23