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Product Introduction
Basic Functions - 30K & 36K 230 volt
(6) Common Protection Functions and Fault Display under COOL, HEAT, DRY and AUTO Modes
A. Overload protection
Ttube: measured temperature of outdoor heat exchanger under cooling mode; and measure temperature of indoor
heat exchanger under heating mode.
1) Cooling overload
a.
If Ttube < 126ºF, the unit will return to its original operation state.
b.
If Ttube > 131ºF, the frequency rise is not allowed.
c. If Ttube > 136ºF, the compressor will run at reduced frequency.
d.
If Ttube > 144ºF, the compressor will stop and the indoor fan will run at preset speed.
2) Heating overload
a.
If Ttube < 126ºF, the unit will return to its original operation state.
b.
If Ttube > 131ºF, the frequency rise is not allowed.
c. If Ttube > 136ºF, the compressor will run at reduced frequency.
d.
If Ttube > 144ºF, the compressor will stop and the indoor fan will run at preset speed.
B. Exhaust temperature protection of compressor
If exhaust temperature > 208ºF, frequency is not allowed to rise.
If exhaust temperature > 217ºF, the compressor will run at reduced frequency.
If exhaust temperature > 230ºF, the compressor will stop.
If exhaust temperature < 194ºF and the compressor has stayed at stop for at least 3 minutes, the compressor will
resume its operation.
C. 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
D. 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.
E. Overload protection
If temperature sensed by the overload sensor is over 239ºF, the compressor will stop and the outdoor fan will stop
with a time lag of 30 seconds. If temperature is below 203ºF, the overload protection will be relieved.
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.
F. Fault of temperature sensors
