Gree GWH09RB-K3DNA3G Service Manual page 21

c.For heating and cooling unit, when (19°C+T
keep the original running mode. If the unit is energized for the first time, it will run in fan mode.
② Protection
a. In cooling operation, protection is the sam e as that under the cooling mode;
b. In heating operation, protection is the same as that under the heating mode;
c. When ambient temperature changes, operation mode will be converted preferentially. Once started, the compressor will remain
unchanged for at least 6 minutes.
(6) Common Protection Functions and Fault Display under COOL, HEAT, DRY and AUTO Modes
① Overload protection
Ttube: measured temperature of outdoor heat exchanger under cooling mode; and measured temperature of indoor heat exchanger
under heating mode.
1) Cooling overload
a.If T ≤52°C, the unit will return to its original operation state.
tube
b.If T ≥55°C, frequency rise is not allowed.
tube
c.If T ≥58°C, the compressor will run at reduced frequency.
tube
d.If T ≥62°C, the compressor will stop and the indoor fan will run at preset speed.
tube
2) Heating overload
a.If T ≤50°C, the unit will return to its original operation state.
tube
b.If T ≥53°C, frequency rise is not allowed.
tube
c.If T ≥56°C, the compressor will run at reduced frequency.
tube
d.If T ≥60°C, the compressor will stop and the indoor fan will blow residue heat and then stop.
tube
② Exhaust temperature protection of compressor
If exhaust temperature≥98°C, frequency is not allowed to rise.
If exhaust temperature≥103°C, the compressor will run at reduced frequency.
If exhaust temperature≥110°C, the compressor will stop.
If exhaust temperature≤90°C and the compressor has stayed at stop for at least 3 minutes, the compressor will resume its operation.
③ Communication fault
If the unit fails to receive correct signals for durative 3 minutes, communication fault can be justified and the whole system will stop.
④ Module protection
Under module protection mode, the compressor will stop. When the compressor remains at stop for at least 3 minutes, the compressor
will resume its operation. If module protection occurs six times in succession, the compressor will not be started again.
⑤ Overload protection
If temperature sensed by the overload sensor is over 115°C, the compressor will stop and the outdoor fan will stop with a time lag of 30
seconds. If temperature is below 95°C, the overload protection will be relieved.
⑥ If voltage on the DC bus is below 150V or over 420V, the compressor will stop and the outdoor fan will stop with a time lag of 30
seconds. When voltage on the DC bus returns to its normal value and the compressor has stayed at stop for at least 3 minutes, the
compressor will resume its operation.
⑦ Faults of temperature sensors
Designation of sensors
Indoor ambient temperature
Indoor tube temperature
Outdoor ambient temperature The sensor is detected to be open-circuited or short-circuited for successive 30 seconds
Outdoor tube temperature
Exhaust
Overload
3. Other Controls
(1) ON/OFF
Press the remote button ON/OFF: the on-off state will be changed once each time you press the button.
(2) Mode Selection
Press the remote button MODE, then select and show in the following ways: AUTO, COOL, DRY, FAN, HEAT, AUTO.
(3) Temperature Setting Option Button
Each time you press the remote button TEMP+ or TEMP-, the setting temperature will be up or down by 1. Regulating Range: 16~30°C,
the button is useless under the AUTO mode.
(4) Time Switch
You should start and stop the machine according to the setting time by remote control.
18
) ＜ T
supplementary
The sensor is detected to be open-circuited or short-circuited for successive 5 seconds
The sensor is detected to be open-circuited or short-circuited for successive 5 seconds
The sensor is detected to be open-circuited or short-circuited for successive 30 seconds, and no
detection is performed within 10 minutes after defrost begins.
After the compressor has operated for 3 minutes, the sensor is detected to be open-circuited or short-
circuited for successive 30 seconds.
After the compressor has operated for 3 minutes, the sensor is detected to be open-circuited or short-
circuited for successive 30 seconds.
＜ 26°C (for cooling only unit, 22°C ＜ T
indoor ambient
Faults
Service Manual
＜ 26°C), it will
indoor ambient
Technical Information