Haier HB21TSSAA, Руководство по обслуживанию

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SERVICE MANUAL
Model: HFD647AS/HB21T SSAA
20
Chapter 5 Control principal and related test functions
5-1. Air Damper
(1) The refrig eration air d amper is controlled wi th t he fresh foo d storage te mperature sensor R
SNR.
(2) The air damper is closed from the beginning of defrosting until 15 minutes after the defrosting is
finished.
(3) Upon initial poweri ng on or resetting of t he control pa nel, the air damper con ducts a
close-and-open cycle before acting according to the control conditions in item (1).
(4) The air 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 R SNR.
(5) The air damper will automaticlly close when REF. door has been opend over 2 minutes.
5-2. Control Principle of the Fan motor
Control principal of the evaporator fan motor and fresh food damper.
1 . When a fresh food door is opened, the evaporator fan moto r will operat e on high speed and the
damper will be full open. After 2 minutes with the door open, the damper will close but the evaporator
fan motor will operate according to the compressor function.
2. The evaporator fan motor will not operate if the freezer door is open ,even if the fresh door is open.
3. An error code alerting of a fan motor problem will appear (see error code section) if the motor
speed is below 300rpm or does not operate for longer than 30 seconds during the run cycle.
Condenser fan motor’s controlling:
The motor works with compressor synchronous.condenser fan motor has a 12V’s power supply
voltage while the rotate speed 1150RPM on normal. And high speed operation is 13.5v - 1300rpm.
5-3.Defrosting Control Principle of HB21TSSAA & HFD647* Refrigerator
Defrost is terminate when the sensor r7
℃
Defrost aborted after 120 minutes
Failing to reach +7
℃
ED displayed on LCD paned as fault
Accumulative
compressor run time
7 hours
5 minutes 3 minutes 7 minutes
Defrost heater
turns on
Defrost heater
turns off
Compressor
turns on
Freezer Fan
turns on
Air Damper
opens
FC fan turns off
Air Damper
Closes
Back to Normal Run
Compressor
turns off
Defrost Time is
about 30 minutes