Control Principle Of Electronic Component; Air Damper; Control Principle Of The Freezer Fan Motor; Control Principle Of The Fridge Fan Motor - Haier AFD626TGW Service Manual

SERVICE MANUAL
Model:AFD626TGW/R/B
Chapter 5 Control principle of electronic component

5-1. Air damper

(1) The damper is controlled with the Variable temperature compartment sensor C SNR.
(2) The damper is closed from the beginning of defrosting until at least 8 minutes after the
defrosting is finished.
(3) Upon initial powering on or resetting of the control panel, the damper conducts a close-and-open
cycle before acting according to the control conditions in item (1).
(4) The damper 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 C 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 freezer fan motor

The freezer fan motor is controlled by the control panel according to the following conditions. The DC
fan's rotation speed is regulated with the input Voltage and the AC fan operates directly.
(1) ON/OFF condition of the freezer fan motor is controlled with the Freezer storage temperature
sensor F SNR;
(2) ON/OFF condition of the freezer fan motor is same with the Compressor.

5-3. Control principle of the fridge fan motor

The fridge fan motor is controlled by the control panel according to the following conditions. The DC
fan's rotation speed is regulated with the input Voltage and the AC fan operates directly.
(1) ON/OFF condition of the fridge fan motor is controlled with the Fridge storage temperature sensor
R SNR.
(2) When the Fridge storage compartment door is open, the fridge fan motor will not run.
5-4. Defrosting control principle
(1) A defrosting cycle will be started once the compressor has operated for 12-18 hours
accumulatively. It will stop defrosting when the defrosting sensor detects a temperature over
10ºC.
(2) The damper and the freezer fan motor is closed, the compressor stops 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 5 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 2010-10-25
Rev. Ref1010S025V0
22