Haier HRF-800DGS8, Service Manual

Page: 15 / 27

SERVICE MANUAL
Model: HRF-800DGS8
15
Issue 2014-11-13
REF. Ref1411S025V1
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
Force start
1)R and F display areas
：
T1
、
T1
；
2)Compressor start work
；
3)Freezer FAN work with high votage
；
Cooling FAN work with high votage
；
4)defrost heater off
；
5)REF air damper open
；
Forced
defrost
1)R and F display areas
：
T2
、
T2
；
2)Enter defrost mode
：
compressor OFF
Freezer /Cooloing FAN OFF
Defrost heater work
，
if the D-SNR ≥ 7
℃ ，
D HTR work 10 sec and then quit test 2 mode;
if the D-SNR
＜
7
℃ ，
D HTR will keep working until the D-SNR ≥ 7
℃
, and then quit test 2 mode;
3
）
REF air damper keep close