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SERVICE MANUAL
Model: HRF-800DGS8
Chapter 5 Control principal and related test functions
5-1. Control principle of fan motor
Control of F-fan:
When open any door, the F-fan will be off, after 10 minutes the F-fan will rework if any door still open and if
all door is close the F-fan will work in normal mode
If setting the s.FRZ or s.cooling mode, F-fan speed is 1500RPM,In other mode, the speed from 1300 to
1500rpm for different condition like environment temp, setting temp and so on.
Control of C-fan:
C-fan is working in-phase with the compressor and at a mutative speed from 1100 to1400RPM for different
environment temp.
5-2. Defrost control
First power on and defrost error mode, the defrost circle is comp working time reach to 4 hours,
At the normal mode: The defrost circle time is alterable; it decided by open door, close door, open door
times, temperatures.
When open the door more times, the defrost circle is 7-12 hours;
When open the door less times, the defrost circle is 12-20 hours;
The longest cycle is 73 hours.
5-3. Self-testing function
1.Force start: Under locked mode, press Set-->Ref.Temp-->OK-->Frz.Temp"(A→D→B→C→A) one by
one within 5 sec. then press "Set",and the REF and RFZ display icon will display T1,T1)
2.Forced defrost : Keep the current state ,and press "Set" ,T2 will be present, then enter forced
defrost mode.
3.Quit:
Keep the current state, press "Set" ,then will be present T3→T4→back to normal display
control,and escape from test mode.
MODE
WORKING CONDITION
1)R and F display areas T1 T1
2)Compressor start work
3)Freezer FAN work with high votage
Force start
Cooling FAN work with high votage
4)defrost heater off
5)REF air damper open
1)R and F display areas T2 T2
2)Enter defrost mode
compressor OFF
Freezer /Cooloing FAN OFF
Forced
Defrost heater work
defrost
if the D-SNR ≥ 7
if the D-SNR 7
3 REF air damper keep close
D HTR work 10 sec and then quit test 2 mode;
D HTR will keep working until the D-SNR ≥ 7 , and then quit test 2 mode;
Issue 2014-11-13
REF. Ref1411S025V1
15
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