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SERVICE MANUAL
Model: HB21FC45N*
Chapter 5 Control principal
5-1. Air Damper
(1) The refrigeration air damper is controlled with the fresh food storage temperature 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 powering on or resetting of the control panel, the air damper conducts 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 motor will operate 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
1 The first defrost cycle will start after an accumulated compressor run time of 4 hours. This will be
a full defrost cycle programmed to start after initial operation start up or after any power down situation.
2 Automatic Defrost
2.1 A defrost cycle will start after 7 hours of accumulated compressor run time.
2.2 The fresh food air damper will be closed and the evaporator fan motor will be off. The defrost
heater will power on.
2.3 The heater will operate until the evaporator temperature reaches 7°C (44.6°F) at the defrost
sensor.
2.4 Seven minutes after the heater shuts off, the compressor will start. The damper will remain
closed and the evaporator fan will be off.
2.5 The compressor will operate for 5 minutes then the evaporator fan will start but the damper will
remain closed
Issue 2010-07-05
Rev. Ref1007S019V0
23
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