Hitachi UTOPIA RAS-4HVRP2E - Page 305

10 Troubleshooting
Troubleshooting in check mode
SMGB0136 rev.0 - 07/2021
303
10

Activation condition of the protection retry control code
The protection control or the retry control is carried out to prevent abnormal operation. The activation conditions are listed
in the following table.
Code Protection control Activation conditions Notes
P01 Pressure ratio protection control CompressionratioƐ≥7.0orcompressionratioƐ≤1.8 -
P02 High pressure increase protection
Discharge pressure
Pd≥3.5
-
P03 Inverter current protection
Inverteroutputcurrent≥(a)A
- Inv. Compressor (a)
ATH356 18.5
P04
Inverterntemperatureincrease
protection
Inverterntemperature≥81°Cfor1ph
Inverterntemperature≥89°Cfor3ph
-
P05
Discharge gas temperature
increase protection
Temperature of the upper part of the compressor
Td≥92°C
-
P06
Low pressure decrease
protection
SuctionpressurePs≤0.1MPa -
P09
High pressure decrease
protection
DischargepressurePd≤1.2MPa -
P0A
Demand current protection
control
Compressorrunningcurrent≥Demandcurrentsetting
value
Demand current setting
value: the Upper limit of
the total running current is
set to 100%, 80%, 70%,
60% and 40% in normal
operation.
P0d Low pressure increase protection Suctionpressure≥1.3MPa -
P11 Pressure ratio decrease retry PressureratioƐ<1.5
When activating three times in thirty
minutes, alarm code "43" is indicated.
P12 Low pressure increase retry Ps > 1.7 MPa
When activating three times in thirty
minutes, alarm code "44" is indicated.
P13 High pressure increase retry Pd≥3.8MPa
When activating three times in thirty
minutes, alarm code "45" is indicated.
P15
Discharge gas temperature
increase retry
Cooling
Dischargegastemperature≥112°Cformorethan
10 minutes, or
Dischargegastemperature≥120°Cformorethan
5 seconds
Heating
Dischargegastemperature≥105°Cformorethan
10 minutes, or
Dischargegastemperature≥120°Cformorethan
5 seconds
When activating three times in sixty
minutes, alarm code "08" is indicated.
Low pressure decrease retry Ps < 0.09 MPa more than 12 minutes
When activating three times in sixty
minutes, alarm code "47" is indicated.
P16
Discharge gas super-heating
decrease retry
Dischargegassuperheat≤Tc+10°Cmorethan
30 minutes
Tc: Saturation temperature
When activating three times in one
hundred and twenty minutes, alarm
code "07" is indicated.
P17 Inverter anomaly retry
Instantaneous overcurrent
When activating six times in thirty
minutes, alarm code "48" is indicated.
Abnormal current sensor
When activating three times in thirty
minutes, alarm code "51" is indicated.
IPM error
When activating seven times in thirty
minutes, alarm code "53" is indicated.
Fintemperature≥100°C
When activating three times in thirty
minutes, alarm code "54" is indicated.