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9.2
Malfunction display section
Analysis or handling of some malfunction display:
1, Compressor discharge protection:
Possible reasons: shortage of refrigerant; block of air filter; poor ventilation or air flow short pass
in condenser; system has noncondensing gas(ge. Water, air);blockage of capillary (including
filter); leakage inside 4-way valve causes incorrect operations; malfunction of compressor;
malfunction of protection delay; malfunction of gas discharge sensor; too high outdoor temperature.
Handling process: refer to the malfunction analysis in the above section
2, low voltage overcurrent protection:
Possible reasons: sudden drop of power supply or overloading
3, Communication malfunction:
Handling method: check if communication signal cable is connected reliably
4, temp sensor open or short circuit:
Handling method: check whether sensor is normal, connected with the corresponding position on
the controller and if damage of lead wire is found
5, compressor overload protection:
Possible reasons: insufficient or too much refrigerant; blockage of capillary and increase of
suction temp.; improper running of compressor, burning in or stuck of bearing, damage of discharge
valve; malfunction of protector.
Handling method: adjust refrigerant amount; replace the capillary; replace the compressor; use
universal meter to check if the contactor of compressor is fine when it is not overheat, if not replace
the contactor.
6, system malfunction:
i.e overload protection. When tube temperaturec (Checking the temperature of outdoor heat
exchanger when cooling and checking temperature of indoor heat exchanger when heating) is too
high, protection will be activated.
Possible reasons: outdoor temperature is too high when cooling; insuffient outdoor air circulation;
refrigerant flow malfunction.
7, IPM module protection:
Handing method: if module malfunctions and can not be restored for long time, please
disconnect power supply. And connect again after about 10 minutes later. If repeating this method
for several times and malfunction still exist, please replace the module.
8, PFC protection:
Possible reasons: outdoor temperature is too high; over-high temperature of PFC module; power
of whole unit is too high and current is too high; low vollage in PFC; bad contact between the cables
in PFC control board.
Handing method: If PFC protection happens, please check connecting cables of PFC board first.
If the whole unit can not operate normally and PFC protection happens all the time, please replace
PFC.
9, refrigerant charging:
Similar with the procedures of the over 5kw wall split models.
Notice: refrigerant charging can only be started after whole unit has been operating stably for about
10 minutes.
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