Fujitsu Airstage V series Service Manual page 73

< Heating mode >
Discharge Temp Discharge Temp
Protection 2 Thermistor
Discharge Temp Discharge Temp
Protection Stop Thermistor
High Pressure High Pressure
Protection Stop Sensor
High pressure
High Pressure
protection control
Sensor
(Only on heating mode)
Low Pressure Low Pressure
Sensor
Protection Stop
Abnormal low
Low pressure
pressure protection
saturation temperature
control
(calculated from
(Only on heating mode)
suction pressure
sensor value)
< Common >
Overcurrent Break Overcurrent
Stop Protection Circuit
Heatsink Temp Heatsink Temp
Protection Stop Detector Circuit
Frequency Maximum Current Detector
Setting Protection Circuit
> =
Start: DISTH 107
< =
Release: DISTH 100
> =
Start: DISTH 120
Release: 3 minutes have passed, and DISTH 80
Start: The operation repeats 3 times
Release: Reset the outdoor unit.
> =
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.
Function/Release judgment is done in every 2 minutes with the
discharge pressure sensor detection value on heating operation
mode.
> =
- Function : HPS 3.54MPa
- Release HPS < 3.30MPa
Note) It functions if it exceeded 3.80MPa within 20seconds
even it did not pass 2 minutes.
< =
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.
- If the low pressure saturation temperature continues below -30.9degC for 2 minutes or more, the capacity
increase of the compressor is prohibited.
- If the low pressure saturation temperature further keeps the condition lower than the setting value for 1 minute,
the compressor capacity is reduced.
- It is released when the low pressure saturation temperature becomes higher than -24.1degC and continues for
25 seconds.
- Inverter compressor is stopped when the over current protection circuit
in the inverter PC Board detects an abnormal current during the
operation.
If it repeated 5 times, the inverter compressor becomes permanent
stop.
- Inverter compressor is stopped when the over current protection circuit
in the inverter PC Board detects an abnormal current at the time of
start up.
Inverter compressor becomes permanent stop if it repeated over the
number of set time.
Release : condition is to reset the power.
Start: Abnormal heatsink temp occurred.
If Abnormal heatsink temp occurred 3 times in 60 minutes,
restart of the DC inverter scroll compressor is restricted.
Release: 120 minutes have passed. Or 5 minutes have passed,
< =
operation capacity rate
> =
Start: Detected current Limit value
(Vary with the outdoor air temperature)
Release: Detected current < Limit value - 0.5A
04-11
< =
within 40 minutes.
> =
70%
EEV2 increases 30Pulse/30sec.
The compressor stops.
(more than 3 minutes)
The compressor stops.
(Permanent stop)
Error indication : refer to 06-20 26
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
Master unit : Outdoor fan speed
is reduced in every 1 step
If the high pressure still
does not decrease,
SV1 is opened.
Slave unit : SV1 is opened.
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
The DC inverter scroll
compressor stops.
Error indication : refer to 6-46, 47
The DC inverter scroll
compressor stops.
The DC inverter scroll compressor
operates on limit frequency.
Until conditions are met
for a release.