Hitachi Set Free mini-HNRQ1 Series, Service Manual

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Protection Control Code and Retry Control Code
Indication
(SEG1)
Protection Control Remark
Pressure Ratio Protection Control
To control the compressor frequency for prevention of operation with high/low
pressure ratio.
High Pressure Increase Protection
Control To control the compressor frequency for prevention of high pressure
increase.
Inverter Current Protection Control
To control the compressor frequency for prevention of inverter current
increase in the outdoor unit during operation.
Inverter Fin Temperature Increase
Protection Control To control the compressor frequency for prevention of inverter fin temperature
increase. The inverter fin temperature is detected at the inverter PCB.
Discharge Temperature Increase Protection
Control To control the compressor frequency for prevention of discharge gas
temperature increase during operation.
Low Pressure Decrease Protection
Control
To control the compressor frequency for prevention of low pressure decrease.
High Pressure Decrease Protection Control
To control the compressor frequency for prevention of high pressure
decrease, which would interrupt smooth refrigerant distribution to indoor units
with different height and oil supply to the compressor.
Demand Current Control
To control the compressor frequency for fixing the inverter primary current
around the set value (40~100% of rated current for cooling).
Low Pressure Increase Protection
Control
To control the compressor frequency for prevention of low pressure increase.
Inverter Trip Retry
To stop the unit operation temporarily for protection of the compressor and
inverter. The operation will be restarted or stopped depending on the retry
frequency.
In sufficient Voltage/Open Phase
Detection Retry
2. Troubleshooting Procedures
2.1 Alarm Code Indication of Wired Controller
Protection control code is displayed on the wired controller when a protection control is activated.
Refrigerant System No. 00
(Scope: 00~63)
Indoor Unit No. ͹ 01
(Scope: 00~63)
Alarm Code No.04
Press the Button Back
to Main Interface
Alarm Sign
Blinking
TROUBLESHOOTING