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SERVICE MANUAL
Model: HRF-660W/U
Chapter 5 Control principal and related test functions
5-1. Air damper
1) Refrigerating sensor R1 controls the startup and shut down of air damper in refrigerator
compartment.
2)The air damper is closed (in order to prevent the comp artment from freezing) within 15 minutes
from the beginning to the finishing of defrosting.
3) Force the air damper to be opened and close d once if it can not be opened within 1 hour . After
that, decide whether open or close it according to R1 sensor.
4) The air damper heater and ice dispenser heater work in-phase.
5) Environment temperature is above 12
heater will be off.
6) Dispenser heater and water drain pipe heater will be off for 10 minutes and 30 minutes on, thus a
circulation.
5-2. Control principle of fan motor
Control of freezing fan:
When open the refrigerating door, the refrigerating air damper will be turned on, and the freezing fan
will be working, after 2 minutes the refrigerating air damper will be turned off.
When open the freezing door, If the freezing fan works at a speed of 1500 RPM, the freezing fan will
keep working but switch to 1300 RPM. If the fan works at a speed of 1300 RPM, it will shut off when
the freezing door is open.
Control of refrigerating fan:
This fan is working in-phase with the compressor and at a fixed speed of 1100 RPM.
5-3. Defrost control
Automatic defrost: Af ter added up t o 7 hours o f compressor running, defrost will be switched on.
When defrost SNR temperature reaches 7℃, defrost will be over.
If the defrosting time is more than 120 minutes, and defrost sensor still can not rea ch to 7ºC, it will
stop defrosting process and give warning error indicator—display error code F6..
Easily failure components of defrosting system：
1）Defrosting fuse: It is located in the left side of evaporator. If the fuse is open circuit, means it is
defective.
2）Connectors: The fre quently failu re phenomenon is that
oblique.
3）Defrosting sensor: It is located in the upper right side of evaporator, the sensor control the
defrosting time.
, the heater of bar will be on, when lower than 10
℃
pin of connectors is dislocation or
Issue 2010-09-30
Rev. Ref1009S031V1
℃
14
,
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