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8.7.5 Indoor heat exchanger high temperature protection.
If T2ϊ60ć, the compressor will stop and not resume until T2˘48ć.
8.7.6 Defrosting mode.
1) Condition of defrosting.
Condition 1: If T4˚0ć,
When the units are running, if any one the following two items are satisfied the units start defrosting:
The units runs with T3˘3ć for 40 minutes and T3 keeps lower than -6ć for more than 3 minutes.
The units runs with T3˘3ć for 80 minutes and T3 keeps lower than -4ć for more than 3 minutes.
Condition 2: If T4˘0ć,
The program judges according to the condition 1, if any one of the two items are satisfied, then judges if T2
has descended for more than 5ć, if it has the machine starts defrosting, or continues to judge T2 and will not
defrost until T2 drops more than 5ć.
Condition 3: No matter what value T4 is, if the machine runs with T3˘3ć for more than 120 minutes and
T3 keeps lower than -2ć for more than 3 minutes, the machine will defrost, no matter if T2 drops for more
than 5ć or not.
2) Condition of ending defrosting.
If any one of following items is satisfied, defrosting will finish and the machine will turn to normal heating
mode.
T3 rises to be higher than 12ć.
T3 rises to be higher than 8ć and remains for 80 seconds.
The machine has run for 10 minutes in defrosting.
8.7.7 Defrosting action.
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