Gree GWH18RC-K3DNA2C, Service Manual

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Technical Information
Service Manual
(9) Current protection
1. If 12A≤I
alternating-current
, running frequency of compressor will be decreased or stop to increase will be occurred;
2. If 17A≤I
alternating-current
, the unit will stop; and compressor has stopped for 3min, the unit will resume running;
3. If the unit stops as compressor discharge temperature for 6 times, it can not resume running automatically and display malf unction, it can
resume by pressing ON/OFF. During operation, if the time exceeds compressor running time, the time of compressor discharge temperature
stop will zero clearing.
(10) Drop off voltage
start up automatically 3min later.
(11) Communication malfunction
If the unit does not receive correct signal from indoor unit for 3min continuously, the unit will stop as communication malfunction protection;
if communication malfunction resume and compressor has stopped for 3min, the unit will resume running.
(12) IPM module protection
When the compressor starts, if there is overcurrent or control voltage low for IPM module as some abnormal results, IPM will detect module
protection signal as the unit is on. Once the module protective signal is detected, stop the unit with module protection immediately. If the
module protection is resumed and compressor has stopped for 3min, the unit will be allowed to operate. If the module protection continu-
ously occurs for three times, it should not be resumed automatically, and you should press the ON/OFF button to resume. If the running
time of compressor exceeds the [t
Protection times clearing of module
], the module protection is cleared to recount.
(13) Compressor overload protection
1. If the switch of compressor overload de-energized is detected for 3S continuously, the system will stop as protection;
2. If the overload protection is resumed and compressor has stopped for 3min, the unit will be allowed to operate.
3. If the unit stops as compressor overload protection occurred for 3 times continuously, it can not resume running automatically and display
malfunction, it can resume by pressing ON/OFF; and the times of compressor overload protection will be cleared after the compressor has
run for 30min.
(8) 4-way valve control
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) Compressor Control
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;