Gree GVH24AK-K3DNC8A Service Manual page 28

Service Manual
6.1.2 When T indoor amb. －⊿ T heating indoor amb. compensation.) ≤-2℃ , or T preset － (T indoor amb. －⊿ T heating
indoor amb. compensation.) ＜ -1℃ lasts for 6 minutes and its frequency decreases to the low limit frequency, the unit will
stop operation as it reaches the temperature point.
6.1.3 Previous running status
6.2 The setting range of below temperature: 16 ～ 30℃
7. Defrosting control (heating mode)
7.1 If the unit satisfies the requirements for time of entering defrosting and it is detected to satisfy the temperature conditions
of defrosting for 3 minutes, it enters into defrosting mode.
7.2 Start defrosting: the compressor stops and will restart after 55 seconds;
7.3 End of defrosting: The compressor stops and will restart after 55 seconds;
7.4 Unit will exit from defrosting operation when any of the conditions below is satisfied:
7.4.1 T outdoor tube ≥【T temperature 1 of ending defrosting】
7.4.2 T outdoor amb. ＜－ 5℃ and T outdoor tube≥【T temperature 2 of ending defrosting】lasts for 80 seconds;
7.4.3 Consecutive operation time of defrosting reaches 【t max. defrosting time】
8. Compressor control
8.1The compressor frequency adopts obscure control according to the relations between ambient temperature and set
temperature, and the modified speed of ambient temperature;
8.2 When it is started under cooling mode, heating mode or drying mode, the outdoor fan operates for 15 seconds before the
compressor starts;
8.3 When it is turned off, shut off due to protection, or transferred to fan mode, the compressor stops immediately.
8.4 Under each mode: Once compressor starts, it is allowed to stop after running for 7 minutes (Note: including when the unit
stops as it reaches the temperature point; excluding the case of malfunction protection, turning off by remote controller, mode
switch, etc.);
8.5 Under each mode: Once compressor stops, it is allowed to restart after 3 minutes (Note: If indoor unit with memory
function is turned off by the remote controller, compressor can be restarted after power is on. Time delay is not required).
9. Outdoor fan control
9.1 If unit is turned off by remote controller, shut off due to protection, or stops operation as it reaches the temperature point,
the compressor stops and the outdoor fan stops after running for 1 min;
9.2 Under fan mode: outdoor fan stops
9.3 Start defrosting: Under defrosting mode, the outdoor fan stops after the compressor stops for 50 seconds;
9.4 End of defrosting: the unit exits defrosting mode and the compressor starts reheating, the outdoor fan starts operation 15
seconds earlier.
10. Four-way valve control
10.1 Under cooling, drying, fan mode, the status of four-way valve: off
10.2 When turning on the unit for heating operation, four-way valve is energized immediately.
10.3 When unit is turned off in heating or transferred to other modes from heating, four-way valve is de-energized after the
compressor stops for 2 minutes;
10.4 In case of protection shutdown, the four-way valve is de-energized after 4 minutes;
10.5 Start defrosting: The compressor stops and the four-way valve will be de-energized after 50s;
10.6 End of defrosting: The compressor stops and the four-way valve will be energized after 50s;
11. Freeze protection
11.1 Under drying mode, if T indoor tube ＜【T freeze stop temperature】is detected within 3 minutes, the freeze protection for
shutdown will be operated. If【T freeze limited frequency temperature】＜ T indoor tube and compressor stops for 3 minutes,
the complete unit is allowed to recover operation;
11.2 Under drying mode, if T indoor tube ＜【T freeze limited frequency temperature】, it may result in accidents that operation
frequency of compressor declines or operation frequency of compressor stops rising;
11.3 If freeze protection shutdown occurs 6 times, the operation cannot be recovered automatically and malfunction continues
to display. Press on/off button to recover. During operation, if compressor operates for more than 10 minutes, times of freeze
protection shutdown should clear to zero. Turning off or transferring to fan/heating mode will clear malfunction and times of
malfunction immediately (if malfunction cannot be recovered, it cannot be cleared after transferring to other modes).
Installation and Maintenance
25