Air Conditioner Service Manual
6
During defrosting, the signals of on-off, timing, sleep, fan speed and swing will be responded, but the
fan speed and swing should be in accordance with Cold Air Prevention rules.
Except the above signal processing during defrosting, no other signals will be dealt with, but only a
voice buzz.
During defrosting, electrical heating (
optional function
) stops compulsively.
Defrosting Enter and Exit program:
Option 1
：
with jumper JC
The condition of enter defrosting: run into defrosting once any of condition 1, 2, and 3 met.
Condition 1
：
As shown in figure 3
Definition:
The followings are all required to meet:
a. IPT1 settles for IPT1
＝
IPTmax
－△
IPT
b. t5
≥
50min
（
running time t5
≥
50min
（
the compressor runs cumulatively
）,
t5 is removable
，
and could
be less than t1
）
c. IPT
＜
40°C
，
and lasts 2min
。
Running into defrosting on condition 1, the first running time of set defrosting is F (8min); after running
a defrosting cycle, the defrosting time should be determined and adjusted.
Figure 3
Condition 2: When running time is more than or equal to 120 min (compressor is running
accumulatively), the indoor temperature is less than 35°C for 2 min sustained. Running into
defrosting under condition 2, defrosting time set is 8 min.
Condition 3: after the compressor is operating for 20min continuously, the indoor pipe temperature is
less than 23°C (cold air prevention wind temperature) when the fan stops running (including
temperature dropping when compressor operating, not including the compressor’s starting up
course), and the machine runs into defrosting according to any one condition as below.
Running into defrosting under condition 3, defrosting time set is 10 min.
a) Running into the first defrosting in 20 min after start-up.
b) The interval from last defrosting equivalent to or more than 50 min (stopping the compressor or the
machine in standby is allowed in the meantime).
Option 2: Without Jumper JC, and no OPT outdoor sensor
when the compressor runs for 45 min (accumulated), if the indoor coil temperature is less than 40°C
for 2 min, the machine runs into defrosting, and lasts for 3min, otherwise when the compressor
