Gree GWH09ACC-S6DBA1A Service Manual page 32

Service Manual
c.For heating and cooling unit, when 22°C(71.6°F)<Tindoor ambient<26°C(78.8°F) (for cooling only unit, 22°C(71.6°F)<Tindoor
ambient<26°C)(78.8°F), it will 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 same 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 willremain
unchanged for at least 6 minutes.
(7)Common Protection Functions and Fault Display under COOL, HEAT, DRY and AUTO Modes
① Overload protection
T : measured temperature of outdoor heat exchanger under cooling mode; and measured temperature of indoor heat exchanger under
tube
heating mode.
1) Cooling overload
a.If T tube≤52°C(125.6°F), the unit will return to its original operation state.
b.If T tube≥55°C(131°F), frequency rise is not allowed.
c.If T tube≥58°C(136.4°F), the compressor will run at reduced frequency.
d.If T tube≥62°C(143.6°F), the compressor will stop and the indoor fan will run at preset speed.
2) Heating overload
a.If T tube≤50°C(122°F), the unit will return to its original operation state.
b.If T tube≥53°C(127.4°F), frequency rise is not allowed.
c.If T tube≥56°C(132.8°F), the compressor will run at reduced frequency.
d.If T tube≥60°C(140°F), the compressor will stop and the indoor fan will blow residue heat and then stop.
② Exhaust temperature protection of compressor
If exhaust temperature≥98°C(208.4°F), frequency is not allowed to rise.
If exhaust temperature≥103°C(217.4°F), the compressor will run at reduced frequency.
If exhaust temperature≥110°C(230°F),, the compressor will stop.
If exhaust temperature≤90°C(194°F), 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 , the compressor will stop and the outdoor fan will stop with a time lag of 30
seconds. If temperature is below 95 , the overload protection will be relieved.
⑥ DC bus voltage protection
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
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°C(1.8°F). Regulating Range:
16(60.8°F)~30°C(86°F), 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.
(5) SLEEP State Control
Installation and Maintenance
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
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.
Faults
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