52
Service Manual
Installation and Maintenance
11.2 Under cooling or drying mode, if T
<6, the operation frequency of compressor may increase or decrease;
11
.2.1 If the unit is stopped because of freeze protection for 6 times successively, it can’t resume operation automatically and the
will be displayed continuously, which can only be resumed by pressing ON/OFF button. During operation, if operation time of
is over, the times of stop operation because of freeze protection will be cleared. If turn off the unit or switch to fan/heating
mode, malfunction and times of malfunction is eliminated immediatel
12. Overload protection
12.1
Overload protection under cooling or drying mode: If T
overload stop operation temp. in cooling
≤T
outdoor tube
, the unit stops operation because of
in cooling; if T
outdoor tube
< T
overload limit-frequecny temp in cooling
and the compressor has stopped for 3min, the complete unit can resume
12.2 Under cooling or drying mode, if
T
overload limit-frequecny temp. in cooling
≤T
outdoor tube
, the frequency of compressor may increase or decrease;
Overload protection under heating mode: If T
overload stop operation temp. in heating
≤T
indoor tube
, the unit stops operation because of overload in
T
indoor tube
<T
overload limit-frequecny temp. in heating
and the compressor has stopped for 3min, the complete unit can resume operation.
12.4 Under heating mode. If
T
overload limit-frequecny temp. in heating
≤T
indoor tube
, operation frequency of compressor may increase or decrease;
If the unit is stopped because of overload protection for 6 times successively, it can’t resume operation automatically and the
will be displayed continuously, which can only be resumed by pressing ON/OFF button. During operation, if operation time of
is over, the times of stop operation because of overload protection will be cleared. If turn off the unit, fan or switch to
fan/heating mode, malfunction and times of
malfunction is eliminated immediately.
13. Discharge temperature protection of compressor
13.1
If T
stop operation temperature for discharge
≤T
discharge
, the unit stops operation because of discharge protection; If T
discharge
<T
limit-frequecny temperature for
and compressor has stopped for 3min, the complete unit can resume operation;
T
normal speed decrease-frequency for discharge
≤T
discharge
, operation frequency of compressor may decrease or increase;
If the unit is stopped because of discharge protection of compressor for 6 times successively, it can’t resume operation automatically
ich can only be resumed by pressing ON/OFF button. During operation, if operation time of compressor is over, the times of stop
because of discharge protection will be cleared. If turn off the unit, or switch to fan/heating mode, malfunction and times of
malfunction is eliminated immediately
14. Current protection function
AC current,
operation frequency of compressor may decrease or increase;
If 17A≤I
AC current,
the system will stop operation because of overcurrent; the complete unit can resume operation only after the
If the unit is stopped because of overcurrent for 6 times successively, it can’t resume operation automatically, which can only be
by pressing ON/OFF button. During operation, if operation time of compressor is over, the times of stop operation because of
operation of compressor, if the voltage is decreasing quickly, the system may stop operation and voltage drop malfunction is
r, the system will be restarted up automatically.
16. Communication malfunction
When it hasn’t received the correct signal from indoor unit for 3min, the unit
will stop operation because if communication malfunction; If
communication malfunction is eliminated and compressor has stopped for 3in, the complete unit can resume operation.
17. OPM module protection
A
fter compressor is turned on, if the overcurrent happens for IPM module, or control voltage is too low because of abnormal causes, IPM
ll detect module protection signal immediately. Once it detected the module protection signal, the unit will stop operation because of
module protection. If module protection is resumed and compressor has stopped for 3min, the complete unit
the unit is stopped because of module protection for 3 times successively, the unit can resume operation automatically unless press
ON/OFF button. If the operation time for compressor is over
, the times of stop operation because of module protection will be cleared.
18. Overheat protection of module
18.1 If
T
normal speed frequency-decreasing temp. of module
≤T
module
, the operation frequency of compressor may decrease or increase;
If T
stop operation temperature of module
≤T
module
, the syste will stop operation for protection. If T
module
<T
frequency-limiting temperature of module
and
compressor has stopped for 3min, the complete unit
the unit is stopped because of overheating of compressor module for 6 times successively, it can’t resume operation automatically
ich can only be resumed by pressing ON/OFF button. During operation, if operation time of compressor is over, the times of stop
operation because of compressor overheating
protection will be cleared. If turn off the unit, or switch to fan mode, times of malfunction is
19. Overload protection of compressor
19.1
If it detected that the overload switch for compressor is open for 3min successively, the complete unit will stop operation for
protection;
19.2 If overload protection is resumed and compressor has stopped for 3min, the complete unit can resume operation;
If the unit stops operation because of overload protection for compressor for 3times successively, it can’t resume operation
y, which can only be resumed by pressing ON/OFF button. After compressor has operated for 30min, overload protection
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