Haier HRF-663ISB2 Service Manual page 19

SERVICE MANUAL
Model: HRF-663ISB2
2.5 Defrosting
2.5.1 Normal defrosting (automatic defrosting)
(1)The compressor operates 7 hours accumulatively before defrosting is activated; when defrosting
SNR reaches above 7°C, defrosting is ended.
(2)The compressor stops and air damper is closed during defrosting.
(3)The compressor operates 4 hours accumulatively upon initial power-on before the first defrosting is
activated.
(4) Automatic defrosting begins after the compressor operates accumulatively 7 hours except for (3).
(5)Defrosting will not begins if there is something wrong with defrosting SNR (short circuit or broken
circuit).
(6) If the defrosting SNR cannot reach 7°C 120 minutes after defrosting, the defrosting heating
element is disconnected and an alarm is given, which glitters in the Position 4. If the SNR can reach 7°C
within 120 minutes, the alarm is canceled.
(7) The compressor and freezer fan are operated before defrosting until the freeze SNR reaches the
shutdown point -2°C to begin defrosting, which minimize the temperature rise in freezer and refrigerator
compartments during defrosting (pre-refrigeration before defrosting).
(8) After defrosting, if the compressor operates 4 hours continuously, the defrosting will begin again.
(9)Fast freeze display is powered on in fast freeze state during defrosting while automatic defrosting goes
on. At the end of automatic defrosting, fast freeze will begin again. The remaining time of defrosting is
included in fast freeze time.
(10) After defrosting, the compressor and fan stops 7 minutes, if F SNR is higher than shutdown point,
the compress starts up 5 minutes, after that, the fan operates. The air damper will be opened or closed
according to temperature after the fan has operated for 3 minutes.
2.5.2 Forced defrosting
(1)Press TEST key twice on main control panel to start forced defrosting.
(2)With the door closed, the heating element is forced open, the defrosting will stops after 4 minutes or
defrosting SNR reaches 7°C. The temperature settings of freezer and refrigerator compartment return to
the state before forced defrosting. If F SNR is higher than the shutdown point 7 minutes after the
compressor and fan are off, the compressor will operate for 5 minutes and then the freezer fan will operate
Issue 2010-01
Ref1001S015V0
Rev.
19