Gree GWH09RB-K3DNA3G Service Manual page 20

Service Manual
the compressor stops.
◆ When compressor is running (not including each malfunction and protection):
a.When outdoor ambient temperature≥20°C and indoor fan speed is low or medium, the fan speed will turn to high; if indoor fan speed
is high or super high, it will keep the same.
b.When outdoor ambient temperature≤18°C, the fan speed will resume set fan speed.
c. When 18°C ＜ outdoor ambient temperature ＜ 20°C, it will run at present fan speed (set fan speed or high fan speed); but when first
exiting cold air prevention after entering heating mode, it will run in set fan speed.
② The condition and process of defrosting
When frost is detected in the condenser, the system will enter into defrosting state. When defrosting starts, the compressor and indoor
fan will stop, and the outdoor fan and four-way valve will delay 30 seconds to stop. The compressor will start after 15 seconds and
then defrosting will be started. When the compressor has run for 7 minutes or defrosting is finished, the compressor will stop. After 30
seconds the four-way valve opens and after another 60 seconds, the compressor and outdoor fan resume running. Theindoor fan will
delay 3 minutes to run at the latest .The Heat indicator will be off for 0.5 second in each 10 seconds during defrosting.
③ Protection function
◆ Anti-cold-wind protection
In HEAT mode, in order to prevent the indoor unit from blowing out cold wind, each time the compressor starts, the indoor fan will delay
3 minutes after the compressor to run at the latest and it can adjust fan speed automatically when temperature is low.
◆ Cold air prevention
The unit is started under heating mode (the compressor is ON):
① In the case of T
indoor amb.
lag of 2 minutes. Within 2 minutes, if T
indoor fan will be converted tooperation at preset speed. Within 1-minute low speed operation or 2-minute non-operation, if T
the fan will run at present speed.
② In the case of T
indoor amb.
to preset speed. Within one-minute low speed operation, if T
Note: T indoor amb. indicated in ① and ② refers to, under initially heating mode, the indoor ambient temperature before the command
to start the compressor is performed according to the program, or after the unit is withdrawn from defrost, the indoor ambient
temperature before the defrost symbol is cleared.
◆ Total current up and frequency down protection
If the total current I ≤W, frequency rise will be allowed; if I
total
reduced frequency; and if I
(4) Fan Mode
Under the mode, the indoor fan will run at preset speed and the compressor, the outdoor fan, the four-way valve and the electric heater
will stop.
Under the mode, temperature can be set within a range of 16~30°C.
(5) AUTO Mode
① Operation way of AUTO mode
a.When T ≥26°C, it will run in cooling mode. The implied set temperature is 25°C (note: the set temperature sending to outdoor unit
ambient
is 25°C).
b.For heating and cooling unit, when T
cooling only unit, when T
Technical Information
T +5
preset
T +5
T +2 preset
preset
T .
amb
T +2
preset
Compressor
Outdoor fan
Compressor
Indoor fan
min.
Outdoor fan
Reversing
valve
Indoor fan
Reversing
valve
The period of defrosting
30s
Four-way valve
Four-way valve
Compressor
30s
Compressor
Outdoor Unit
Outdoor Unit
Indoor Unit
Indoor Unit
Run
<24°C: if T ≤40°C and the indoor fan is at stop state, the indoor fan will begin to run at low speed with a time
tube
>40°C, the indoor fan also will run at low speed; and after1-minute operation at low speed, the
tube
≥24°C: if T ≤42°C, the indoor fan will run at low speed, and afterone minute, the indoorfan will be converted
tube
≥Z, the compressor will stop and the outdoor fan will stop with a time lag of 30s.
total
≤(19°C+T
ambient
≤22°C, it will run in fan mode and the displayed set temperature is 25°C.
ambient
min.
m i . n m i . n
T .
amb
min.
m i . n
preset wind
min. preset wind
preset wind
min.
min.
Run
Stop
Run
Stop
The period of defrosting 30s
7min
60s
30s 30s
15s
7min
60s
15s
30s
3min Set fan speed
Stop
Run Stop
>42°C, the indoor fan will beconvertedto preset speed.
tube
≥X, frequency rise will not be allowed; if I
total
), it will run in heating mode. The implied set temperature is 20°C; for
supplementary
Stop heating
Original operating status
Stop heating
Original operating status
Start heating
Start heating
m i . n
preset wind
3min Set fan speed
≥Y, the compressor will run at
total
≤42°C,
tube
17