Protective Function List - Fujitsu Airstage V series Service Manual

4-6 PROTECTIVE FUNCTION

4-6-1 Protective Function List

< Cooling mode >
Protective Function
Detect Parts
Discharge Temp Discharge Temp
Protection 1
Thermistor
Discharge Temp Discharge Temp
Protection 2 Thermistor
Discharge Temp Discharge Temp
Protection Stop Thermistor
High Pressure
High Pressure
Protection
Sensor
High Pressure High Pressure
Protection Stop Sensor
High pressure
Abnormal high
saturation temperature
pressure protection
(calculated from
control
discharge pressure
sensor value)
Low Pressure Low Pressure
Protection Sensor
Low Pressure Low Pressure
Sensor
Protection Stop
Operating Condition
Start: After 3 min startup, keep DISTH 100
time of operation at over 10degC of Suction SH (Suction
temperature - TSLP) continues over 30 minutes.
< =
Release: DISTH 95 and TH11 - TSLP
> =
Start: DISTH 107
< =
Release: DISTH 100
> =
Start: DISTH 120
Release: 3 minutes have passed, and DISTH 80
Start: The operation repeats 3 times within 40 minutes.
Release: Reset the outdoor unit.
> =
Start: HPS 3.74MPa
Release: 2 minutes have passed, HPS<3.5MPa and
release of the of the High Pressure Protection Stop.
> =
Start: HPS 4.1MPa
Release: 3 minutes have passed, and HPS<3.5MPa.
Start: The operation repeats 3 times in an hour.
Release: 10 minutes have passed, and HPS<3.5MPa.
- 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.
< = < =
Start: LPS 0.65MPa and INV 30Hz
Release: 5 minutes have passed, INV 50Hz and release of the
of the Low Pressure Protection Stop.
< =
Start: LPS 0.1MPa and 10 minutes have passed.
< =
(Stop : LPS 0.1Mpa 2min at TEST RUN)
Release: 3 minutes have passed, and LPS 0.2MPa.
Start: The operation repeats 5 times in 3 hours.
Release: Reset the outdoor unit.
04-10
> =
or when the accumulated
< =
5
< =
> =
> =
Operation
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
EEV2 increases 30Pulse/30sec.
The compressor stops.
(more than 3 minutes)
The compressor stops.
(Permanent stop)
Error indication : refer to 06-20 26
SV1 opens
HPS:High Pressure Sensor value
All the compressors of the
outdoor unit stop.
(more than 3 minutes)
All the compressors of the
outdoor unit stop.
(more than 10 minutes)
HPS : High pressure sensor value
Error indication : refer to 06-26
SV1 opens
LPS: Low Pressure Sensor value
INV: Operation frequency of the
DC scroll compressor
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