Omega WM 09K Service Manual page 11

d. When -15℃≤ FrostDeg < -13℃, and OPT < FrostDeg , the .2 times defrosting interval time is
65 minutes.
e. When -15℃≤ FrostDeg < -10℃, and OPT < FrostDeg , the .2 times defrosting interval time is
75 minutes.
f. When FrostDeg < -15℃, and OPT < -15℃, the .2 times defrosting interval time is 75 minutes.
FrostDeg = C*OAT-α
OAT: Outdoor environment temperature.
When OAT< 0℃, C=0.8, when OAT≥ 0℃, C=0.6
α=8
Before the air con comes into defrosting, compressor running frequency drop down to a
lower frequency firstly, then the compressor shuts down.
In defrosting, all protection function are available.
T1
T
Drop frequency
Times
or stop
In defrosting, LED showing by winking.
No matter what AC come into or out of defrosting, indoor fan motor speed is the same as
Cold Air Prevention C
While one of the following conditions is satisfied, unit comes out of defrosting and shifts to
heating mode:
a. Outdoor coil Temperature (OPT) >5℃ and keeps 30 seconds.
b. Outdoor coil Temperature (OPT) >10℃ and keeps 2 seconds.
c. Continue 11minutes defrost Operation.
(5) Indoor exchanger overheat protection
When Indoor exchanger Temperature (IPT) is higher than 54℃ , unit comes into indoor exchanger
overheat protection. The compressor drops its frequency.
If IPT≥65℃ and keep for 30 seconds, control system shut down compressor, and recover while IPT
drop less than 52℃.
6. "SLEEP" mode
When the SLEEP button is pressed, the AC operates as following:
The indoor fan speed is set at low speed, the power lamp and the sleep lamp is on,

the display of temperature will close after 30 seconds.
When selecting COOLING/DRY operation with SLEEP mode, the set temperature will be

raised by 1℃ 1 hour later and by 2℃ 2 hour later, after 3 hours, the set temperature will be
raise by 3℃ and keeps 2hours. And then the temperature is Set+2℃, after 1 hour, the
temperature is set temperature and keep.
When selecting HEATING operation with SLEEP mode, the set temperature will be dropped

by 1℃1 hour later and 2℃ 2 hours later, after 3 hours, the set temperature will be dropped by
Air Conditioner Service Manual
T2 T3 T4 T5
Rise
50s 5s 5s
frequency
ontrol.
T6 T7 T8
Stop
2-11Min 50s
Defrost
T9 T10
10s Rise frequency
10