4-6 PROTECTIVE FUNCTION
04-10
4-6-1 Protective Function List
Protective Function
< Cooling mode >
Detect Parts
Operating Condition
Operation
Discharge Temp
Protection 1
Discharge Temp
Thermistor
The signal that opens the EEV
is sent to the indoor unit
DISTH: Actual discharge Temp
DISTR: Target discharge Temp
THII: Suction Temp
TSLP: Low pressure power saturation
Start: After 3 min startup, keep DISTH 100 or when the accumulated
time of operation at over 10degC of Suction SH (Suction
temperature - TSLP) continues over 30 minutes.
>
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Release: DISTH 95 and TH11 - TSLP 5
<
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<
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Discharge Temp
Protection 2
Discharge Temp
Thermistor
EEV2 increases 30Pulse/30sec.
Start: DISTH 107
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Release: DISTH 100
<
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Discharge Temp
Protection Stop
Discharge Temp
Thermistor
Release: 3 minutes have passed, and DISTH 80
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The compressor stops.
(more than 3 minutes)
Start: DISTH 120
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Start: The operation repeats 3 times within 40 minutes.
Release: Reset the outdoor unit.
The compressor stops.
(Permanent stop)
Error indication : refer to 06-20 26
High Pressure
Protection
High Pressure
Sensor
Release: 2 minutes have passed, HPS<3.5MPa and
release of the of the High Pressure Protection Stop.
Start: HPS 3.74MPa
>
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SV1 opens
High Pressure
Protection Stop
High Pressure
Sensor
Start: HPS 4.1MPa
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Release: 3 minutes have passed, and HPS<3.5MPa.
All the compressors of the
outdoor unit stop.
(more than 3 minutes)
HPS:High Pressure Sensor value
Start: The operation repeats 3 times in an hour.
Release: 10 minutes have passed, and HPS<3.5MPa.
All the compressors of the
outdoor unit stop.
(more than 10 minutes)
HPS : High pressure sensor value
Error indication : refer to 06-26
(Stop : LPS 0.1Mpa 2min at TEST RUN)
Start: The operation repeats 5 times in 3 hours.
Release: Reset the outdoor unit.
Low Pressure
Protection
Low Pressure
Sensor
Start: LPS 0.65MPa and INV 30Hz
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<
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<
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Release: 5 minutes have passed, INV 50Hz and release of the
of the Low Pressure Protection Stop.
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SV1 opens
LPS: Low Pressure Sensor value
INV: Operation frequency of the
DC scroll compressor
Low Pressure
Protection Stop
Low Pressure
Sensor
Release: 3 minutes have passed, and LPS 0.2MPa.
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Start: LPS 0.1MPa and 10 minutes have passed.
<
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All the compressors of the
outdoor unit stop.
(more than 3 minutes)
All the compressors of the
outdoor unit stop.
permanent stop
Error indication : refer to 06-27
Abnormal high
pressure protection
control
High pressure
saturation temperature
(calculated from
discharge pressure
sensor value)
- If the high pressure saturation temperature becomes higher than 60.5degC for 25 seconds, the capacity increase
of the compressor is prohibited.
- If the high pressure saturation temperature further keeps the condition higher than 62degC for 25 seconds, the
compressor capacity is reduced.
- It is released when the high pressure saturation temperature becomes lower than 59.5degC and continues for 25
seconds.
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