Panasonic U-4LE1E5, Service Manual, Page: 24 / 133

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Mini VRF SYSTEM
Control Functions
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10-1. Discharge Gas Temperature Protection
Alarm
The compressor upper-limit discharge temperature is 106°C. If the discharge temperature reaches 106°C, then
the compressor stops. If the discharge temperature reaches 106°C 4 times repeatedly after restart, an alarm
occurs. After the compressor stops, if the discharge temperature at the stopped compressor is at or above 101°C,
the compressor start restriction temperature, then this compressor does not operate until the temperature drops.
10-2. Control For Detection of Discharge Sensor Failures
If the temperature is at or above sensor failure temperature (80°C) (value in parentheses) 60 minutes after
the compressor stopped, an alarm occurs.
If the discharge gas temperature remains at or above sensor failure temperature (101°C) for 20 minutes
after the system is stopped, an alarm occurs.
In this case, in addition to sensor failure, compressor overheating caused by insufficient refrigerant is also a
possibility.
11. Current Protection
11-1. Fan Motor
Compressor
model
Compressor
type
Compressor
start restriction
temperature (°C)
Alarm display
Compressor 1 Inverter 106 103 P03
List of discharge temperature protections
Stop temperature (°C)
Compressor 1 Inverter F04
List of discharge sensor failures
Stop temperature (°C)
Alarm Description
P22
Occurs when the fan motor detects overcurrent, or when the
fan motor is locked and does not turn.
Compressor
model
Compressor
type
10. Discharge Gas Temperature
11. Current Protection
SM830195-01̲Mini VRF SYS.indb 18 SM830195-01̲Mini VRF SYS.indb 18 2011/12/20 16:31:05 2011/12/20 16:31:05