Air Conditioner Service Manual
7
Condition 1
：
As shown in figure 3
Defination:
The followings are all required to meet:
a. IPT1 settles for IPT1
＝
IPTmax
－△
IPT
（
8
℃）
b. t5
≥
50min
（
running time t5
≥
50min
（
the compressor runs cumulatively
），
t5 is removable
，
and could
be less than t1
）
c. IPT
＜
40
℃，
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 temperature is less
than 23 ° C which is anti-cold wind temperature when the fan stops running(including temperature
droping when compressor operating, not including the compressor’s starting course), and the
machine runs into defrosting according to any one condiciton 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: No Jumper JC, and no OPT outdoor sensor
when the compressor runs for 45 min, 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 runs for 120 min,
the machine runs into defrosting automatically and last for 10 min.
Option 3: No jumper JC, but with OPT outdoor sensor
When heating, when the temperature of outdoor unit under heat-exchange is lower than E ° C (-4 ° C),
and the compressor runs for 45 min, then the machine runs into defrosting and last for 10 min.
Option 4. When heating, when the outdoor fan motor stopped but the compressor not stopped
