Gree GWC30LB-D3DNA3G Service Manual page 26

Service Manual
b.Under AUTO mode,if T
temperature is 77 ºF
the indoor fan will run at preset speed; and if T
c.Under AUTO mode, if T
preset temperature is 64
and the indoor fan will run under the mode of residue heat blowing; and if T
atits original state. The cooling-only unit will run under fan mode.
d.Under AUTO mode, if 71.6
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 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
T : measured temperature of outdoor heat exchanger under cooling mode; and measured temperature of indoor heat ex-
tube
changer under heating mode.
1) Cooling overload
a. If T 126 , the unit will return to its original operation state. ºF
tube
b. If T 131 ºF
tube
ºF
c. If T 136
tube
d. If T 144 ºF
tube
2) Heating overload
a. If T 126 ºF
tube
b. If T 131
ºF
tube
ºF
c. If T 136
tube
d. If T 144 ºF
tube
Exhaust temperature protection of compressor
②
If exhaust temperature
If exhaust temperature
If exhaust temperature
If exhaust temperature
its operation.
Communication fault
③
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.
Overload protection
⑤
If temperature sensed by the overload sensor is over 239
time lag of 30 seconds. If temperature is below 203
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.
⑥ Faults of temperature sensors
ºF
. T +1.8 is detected,the unit will select to run under cooling mode,in which case implicit preset
amb preset
; if T . T -1.8 ºF , the compressor will stop, the outdoor fan will stop with a time lag of 1 minute, and
amb preset
preset
ºF
. T + 3.6 is detected, the unit will select to run under heating mode, in which case implicit
amb preset
ºF T
; if T . +9 ºF
preset
amb
ºF < Tamb.< 78.8 ºF , the unit will remain at its original state.
, frequency rise is not allowed.
, the compressor will run at reduced frequency.
, the compressor will stop and the indoor fan will run at preset speed.
, the unit will return to its original operation state.
, frequency rise is not allowed.
, the compressor will run at reduced frequency.
, the compressor will stop and the indoor fan will blow residue heat and then stop.
ºF
208 , frequency is not allowed to rise.
ºF
217 , the compressor will run at reduced frequency.
ºF
230 , the compressor will stop.
194 ºF and the compressor has stayed at stop for at least 3 minutes, the compressor will resume
- 1.8
ºF < T .< T +1.8
amb preset
, the compressor will stop, the outdoor fan will stop with a time lag of 1 minute ,
preset
ºF
, the compressor will stop and the outdoor fan will stop with a
, the overload protection will be relieved .
ºF
ºF , the unit will remain at its original state.
ºF
+3.6 < T .< T +41 , the unit will remain
amb preset
ºF
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