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Technical Information
Service Manual
①
The frequency of compressor will be controlled with the relationship of ambient temperature and preset temperature and changing
speed of ambient temperature;
②
Start the compressor after starting cooling, heating, dry operations, and the outdoor fan start for 5s;
③
When the unit is off, in safety stops and switching to fan mode, the compressor will stop immediately;
④
In all modes: once the compressor starts up, it will not be allowed to stop until having run for the [T
min. Compressor running time
] (Note:
including cases of shutdown when the temperature point is reached; except the cases requiring stopping the compressor such as fault
protection,remote shutdown, mode switching etc.);
⑤
In all modes: once the compressor stops, it will be allowed be restart after 3-minute delay (Note: The indoor units have a function of
power memory, the machine can be restarted after remote shutdown and powering up again without delay).
(7) Outdoor Fan Control
①
When the unit is off by remote control, in safety stops and stop after reaching to the temperature point.
②
In fan mode: The outdoor fan stops;
③
Start to defrost: Outdoor fan will stop after compressor stops for 50S;
④
Defrosting fi nish: Outdoor fan will start up when the compressor is stopping.
(8) 4-way valve control
①
The 4-way valve control under the modes of Cooling, dehumidifi cation and fan: closing;
②
When the unit is on in heating mode, the 4-way valve is energized;
③
When the unit is on in heating mode and heating mode shift to other modes, the 4-way valve will be de-energized after compressor
stops for 2min;
④
After protection stops, the 4-way valve will be de-energized after 4min;
⑤
Start to defrost: The power of 4-way valve will be de-energized after the compressor stops;
⑥
Defrosting finish: The 4-way valve will be energized after the compressor stops.
(9)Freeze prevention protection
①
Under cooling or drying mode, if it detected that Tindoor tube <0°C for 3 min successively, the unit will stop operation due to freeze
prevention protection. If 6°C<Tindoorr tube, and compressor has stopped for 3min, the complete unit can be allowed to resume
operation;
②
Under cooling or drying mode, if Tindoor tube<6°C, the operation frequency of compressor may decrease or the operation frequency
of compressor may stop increasing,
③
If the unit stops operation due to freeze prevention protection for 6 times successively, the unit cant resume operation automatically
and error code will be displayed successively. Only press ON/OFF button can resume the operation. During operation process, if
compressor operates for more than 10min, times of stop operation due to freeze prevention protection will be cleared.
Malfunction and malfunction times will be cleared immediately when turning off the unit or switch to fan/heating mode.
(10)Overload protection function
①
Overload protection function under cooling or drying mode, if 65°C≤Toutdoor tube, the unit stops operation due to overload protection
under cooling; if Toutdoor tube<55°C, and compressor has stopped for 3mins, the complete unit can then be allowed to resume
operation;
②
under cooling or drying mode, if 55°C≤Toutdoor tube, operation frequency of compressor will decrease or operation frequency of
compressor will stop increasing;
③
Overload protection function under heating mode, if 64°C≤Tindoor tube, the unit will stop operation due to overload protection under
heating, If Tindoor tube<54°C, and compressor has stopped for 3min, the complete unit can then be allowed to resume operation;
④
Under heating mode, if 54°C≤Tindoor tube, operation frequency of compressor will decrease or operation frequency of compressor
will stop increasing;
⑤
If the unit stops operation due to overload protection for 6 times successively, the unit cant resume operation automatically and error
code will be displayed successively. Only press ON/OFF button can resume the operation. During operation process, if compressor
operates for more than 10min, times of stop operation due to overload protection will be cleared. Malfunction and malfunction times will
be cleared immediately when turning off the unit, under fan mode or switching to heating mode.
(11)Discharge temperature protection function of compressor
①
If 115°C≤Tdischarge, the unit stops operation due to discharge protection; if Tdischarge<97°C, and compressor has stopped for
3min,the complete unit can then be allowed to resume operation;
②
If 97°C≤Tdischarge, operation frequency of compressor will decrease or operation frequency of compressor will stop increasing;
③
If the unit stops operation due to discharge temperature protection of compressor for 6 times successively, the unit cant resume
