Hitachi UTOPIA RAS-4HVRP2E Service Manual page 305

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