18
Technical Information
Service Manual
3) High exhaust temperature protection
If the exhaust temperature is higher than protection value, the compressor stops running.
If the exhaust temperature protection continuously appears for 6 times, the compressor can’t resume running. In this case, only by cutting off
the power and then reenergize that the compressor can restart. If the running duration of the compressor is longer than 10min, the protection
times will be cleared to zero time.
4) Communication malfunction
Detection of the quantity of installed indoor units: after 3min of energizing, if the outdoor unit does not receive the communication data of
certain indoor unit, the outdoor unit will judge that indoor unit is not installed. If the outdoor unit receives the communication data of that
indoor unit later, the communication malfunction will be cleared.
5) System high-pressure protection
a. When the high-pressure switch detects the system pressure higher than limit ,then the high-pressure switch cuts off, the system will stop to
run.
b. If high-pressure protection is detected for one time, only by cutting off the power and then reenergize that the compressor can restart.
6) Compressor overload protection
No matter the compressor is on or off, when the compressor overload switch is detected activated, the system will stop and indoor unit
will display H3. If the compressor overload protection appears for more than 6 times, in this case, only by cutting off the power and then
reenergize that the compressor can restart. If the running duration of the compressor is longer than 30min, the protection times will be
cleared to zero.
7) Antifreeze protection
Under cooling and dry mode, 6minutes after the compressor is started:
When it is detected for 10 minutes successively that Tevap. Is less than -2
O
C
(varying with indoor unit), the antifreeze protection will be
activated, in which case the outdoor unit will immediately shut off the indoor electronic expansion valve and the capacity will be set to “0”.
If Tevap. exceed 10
O
C
and the compressor has remained at OFF for at least 3minutes, the compressor will resume its original operation state.
