5.4.2 Defrosting Control
Conditions for Defrosting:
After the compressor starts and enters normal
operation, mark the minimum value of T3 from
the 10th to 15th minute as T30.
If any one of the following conditions is satisfied,
the unit enters defrosting mode:
1) If the compressor’s cumulative running time
reaches 29 minutes and T3< TCDI1 and T3＋
T30SUBT3ONE≦T30.
2) If the compressor cumulative running time
reaches 35 minutes and T3< TCDI2 and T3＋
T30SUBT3TWO≦T30.
3) If the compressor cumulative running time
reaches 40 minutes and T3< -24C for 3 minutes.
4) If the compressor cumulative running time
reaches 120 minutes and T3<-15℃.
5) If the air conditioner is shut down from heating
mode, it will enter defrost if any of the following
conditions are met (this condition can be shielded
by parameters):
a) The continuous operation time of the press
exceeds 30 minutes, and T3<-7 degrees;
b) The continuous operation time of the press
is more than 30 minutes, and T30<-15 degrees;
6) For the first defrosting when the machine is
turned on, after the compressor has been running
for 30 minutes, when T4-T3> (0.5T4 +
KDELTT_ADD) and T3 <TCDIN5_ADD, it will
immediately enter the defrosting action. After
performing this defrosting action once, this rule
will be invalid until the next restarting operation.
7) If any one of the following conditions is
satisfied, the unit enters defrosting mode,
a) If T3 or T4 is lower than -3°C for 30
seconds,Ts-T1 is lower than 5°C and compressor
running time is more than
DEFROST_COND6_IN_TIM.
b) If T3 or T4 is lower than -3°C for 30 seconds
and compressor running time is more than
DEFROST_COND6_IN_TIM +30.
Defrost Stop Conditions
If any one of the following conditions is satisfied,
defrosting ends and the unit returns to normal
heating mode:
----T3 rises above than TCDE1℃.
----T3 remains at TCDE2℃ or above for 80
seconds.
----The machine runs for 10 consecutive minutes
in defrosting mode.
Defrosting Action：
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