GREE Air-ccoled Closed Control Unit Service Manual
89
of return air. (If a module has malfunction of probe of
return air, the detection of the overheating of return air
will be shielded).
High
temperature
protection for
discharge of
compressor
Discharge temp
sensor
When compressor operates, if compressor discharge
temperature is higher than set value for continuous 30
seconds, compressor and corresponding loads (valve
for dehumidifying and gas by-pass valve) will be turned
off without being restricted by set delay time. The
outdoor fan will be turned off 5 seconds later, the
corresponding malfunction will be displayed on display
and alarm also will be given out. After 3 minutes, if
discharge temp is lower than 90
℃, the malfunction will
be removed and the system will resume operation
without being restricted by set delay time. If discharge
temp ≥90
℃, or the protection occurs 3 times during 1
hour, there is such malfunction and the system can’t
automatically resume operation. The corresponding
malfunction will be displayed and alarm will be given
out. Reset or de-energize the unit to clear the
malfunction signal.
Low
pressure
protection of
compressor
Pressure controller
When compressor operates for over 15 seconds and
the low pressure signal is detected during set delay
time, compressor and corresponding loads will be
turned off without being restricted by set delay time.
The outdoor fan will be turned off 5 seconds later, the
corresponding malfunction will be displayed on display
and alarm also will be given out. After 3 minutes, if low
pressure controller is automatically reset, the
compressor will automatically operate without being
restricted by delay time and the malfunction will be
removed. If the malfunction can’t be removed
automatically, or the protection occurs 3 times during 1
hour, there is such malfunction and the operation can’t
be automatically resumed. The corresponding
malfunction code will be displayed and alarm will be
given out. Reset or de-energize the unit to clear the
malfunction signal.
Low
pressure
protection of
compressor
Pressure controller
When high pressure signal is detected for continuous 3
seconds, compressor and corresponding loads will be
turned off without being restricted by set delay time.
The outdoor fan will be turned off 5 seconds later, the
corresponding malfunction will be displayed on display
and alarm also will be given out. The malfunction can’t
be automatically removed. Reset or de-energize the unit
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