Gree GWH09AGA-K6DA1A Service Manual page 54

Service Manual
Outdoor Unit
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1. Cooling mode:
Working condition and process of cooling mode:
① When Tindoor ambient temperature≥Tpreset, unit enters into cooling mode. Indoor fan, outdoor fan and compressor
start operation. Indoor fan operates according to set fan speed.
② When Tindoor ambient temperature≤Tpreset-2
Indoor fan operates according to set fan speed.
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③ When Tpreset-2 C<Tindoor ambient temperature<Tpreset, unit operates according to the previous status.
Under cooling mode, 4-way valve is not energized. Temperature setting range is 16~30
malfunction in cooling mode, indoor fan and swing motor will work according to the original status.
2. Drying mode
(1) Working condition and process of drying mode
① When Tindoor ambient temperature>Tpreset, unit will be in drying mode. Outdoor fan and compressor start operation
while indoor fan will operate at low fan speed.
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② When Tpreset-2 C≤Tindoor ambient temperature≤Tpreset, unit operates according to the previous status.
③ When Tindoor ambient temperature<Tpreset-2
(2) Under drying mode, 4-way valve is not energized. Temperature setting range is 16~30
(3) Protection function: same as in cooling mode.
3. Fan mode
(1) Under this mode, indoor fan can select different fan speed (except Turbo) or auto fan speed. Compressor, outdoor fan
and 4-way valve all stop operation.
(2) In fan mode, temperature setting range is 16~30
4. Heating mode
Working condition and process of heating mode:
① When Tpreset-(Tindoor ambient temperature-Tcompensation)≥1
outdoor fan and 4-way valve start operation.
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② When -2 C<Tpreset-(Tindoor ambient temperature-Tcompensation)<1
status.
③ When Tpreset-(Tindoor ambient temperature-Tcompensation)≤-2
will stop 30s later. Indoor fan will be in residual-heat blowing status.
④ When unit is turned off under heating mode or changed to other modes from heating mode, 4-way valve will be
power-off 2min after compressor stops working (compressor is in operation status under heating mode).
⑤ When Toutdoor ambient temperature>30
⑥ Under the condition that compressor is turned on, when unit is changed to heating mode from cooling or drying mode,
4-way valve will be energized in 2~3mins delay.
Note: Tcompensation is determined by IDU and ODU. If IDU controls the compensation temperature, then Tcompensation is
determined according to the value sent by IDU to ODU; If IDU does not control the compensation temperature, then
Tcompensation will default to 3
5. Freon recovery mode
After the Freon recovery signal from IDU is received, cooling at rated frequency will be forcibly turned on to recover Freon.
Indoor unit will display Fo. If any signal from remote controller is received, unit will exit from Freon recovery mode and
indoor unit stops displaying Fo.
6. Compulsory defrosting
If unit is turned on under heating mode and set temperature is 16
5s, unit will enter into compulsory defrosting mode and send the signal to ODU. When the compulsory defrosting signal from
ODU is received, IDU will exit from the compulsory defrosting mode and stop sending the signal to ODU.
After ODU receives the compulsory defrosting code, it will start compulsory defrosting. Defrosting frequency and opening
angle will be the same as in normal defrosting mode. When compulsory defrosting is finished, the complete unit resumes
original status.
Installation and Maintenance
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C, compressor stops operation and outdoor fan will stop 30s later.
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C, compressor stops operation and outdoor fan will stop 30s later.
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C.
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C, compressor stops operation immediately. Outdoor fan will stop 30s later.
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C by the ODU.
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C. If compressor stops because of
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C.
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C, unit enters into heating mode. Compressor,
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C, unit operates according to the previous
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C, compressor stops operation and outdoor fan
o C (by remote controller), press "+, -, +, -, +, -" within
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