Air Conditioner Service Manual
8
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
runs for 120 min (accumulated), the machine runs into defrosting automatically and last for 10 min.
Option 3: Without jumper JC, but with OPT outdoor sensor
While heating, when the temperature of condenser is lower than E °C (-4°C), and the compressor runs
for 45 min (accumulated), then the machine runs into defrosting and lasts for 10 min.
Option 4.
On heating, while the outdoor fan motor stopped but the compressor operated
accumulative totally 30min, then the machine runs into defrosting and last for 8 min. if the accumulative
totally less than 30min, but accord with one of the condition option 1-3 then the machine runs into
defrosting at the option 1-3 and the accumulative total time restarts from 0.
Conditions for quitting defrosting
(1) The quitting conditions for option 1, option 2 and 4, the machine quits from defrosting if any one
below condition met.
6
a. Defrosting time is over.
7
b. When it runs in defrosting for three minutes, the IPT indoor coil temperature rises 15°C or above
from the bottom point.
(2) The quitting conditions for option 3.
When OPT
≥
20°C or defrosting for more than 10 min, then quit from defrosting.
(3) Defrosting process shown in Figure 4
Figure 4 Defrosting process
7) Auxiliary electric heating function (optional)
(1) The default condition is automatic on/off the electric heating function.
(2) The conditions of auxiliary electric heating works (all the following conditions must be met)
a. the compressor runs for more than 3min
；
b. indoor fan runs normally
；
c. not in defrosting state;
Compressor Relay
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
OFF
39S
19S
5S
t
4-way Valve
Outdoor Fan
The indoor fan runs in anti-cold wind modle
Defrosting time MAX 12 Min
ON
