For 21k,24k models:
1) Defrosting condition:
AC will enter defrosting mode if any of the following items is satisfied.
(1) When T3＜TC1℃, if th e compressor keeps running over 40 minutes and T3＜TC3℃ for 3 minutes.
(2) After the last defrosting, the time that the outdoor fan is off but the compressor is on in high T2
protection cumulates up to 90 minutes.
2) Condition of ending defrosting:
If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to
normal heating mode.
(1)T3 rises to be higher than TC2.
(2)The machine has run for 10 minutes in defrosting.
3) Defrosting action：
For MSR1-16HRN1-QB8(A),MSR1-18HRN1-QC2, MSR1-07HRN1-QB6(A) models:
Condition of defrosting:
If any one of following items is satisfied, defrosting will start.
Condition 1: Both the following conditions are satisfied:
A: If the working time of the compressor accumulates to 42 min and one continuous
working time is more than 330s.
B: Check the temperature difference between T2 and T1
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