Alarm Information - Panasonic U-8ME1E8E Service Manual

11. Alarm Information

11-1. Discharge temperature
11-1-1. Discharge temperature protection
The upper limit discharge temperature is 106°C for all compressors. When the discharge temperature reaches
106°C, that compressor is stopped and restarted. If the same high discharge condition occurs XX times, then
an alarm occurs.
* "XX" above is able to set in EEPROM of each outdoor unit
EEPROM setting in main outdoor unit
1
CODE : B3 : compressor 1
B4 : compressor 2
B5 : compressor 3
Setting No XX
5 5 (factory preset mode)
10 10
20 20
50 50
After a compressor has stopped, that compressor will not operate until the temperature has dropped to or below
the start-prohibit temperature.
Discharge temperature protection list
Compressor No.
Type
Stop temp.
Start-prohibit temp.
Alarm display
11-1-2. Discharge sensor trouble detection control
-An alarm occurs if the discharge temperature remains abnormally high (above 70°C), when the system has
been stopped for 60 minutes.
*In this case, possible causes include sensor failure and compressor overheating caused by insufficient
refrigerant.
-The alarm also occurs if the sensor temperature is at or above the abnormal temperature (100°C) when 30
minutes have passed after the compressor stopped.
* In this case, it is possible that the discharge temperature from a different compressor unit is being detected, due
to an error in the installation of the discharge thermistor.
Discharge sensor failure list
Compressor No.
Type
Alarm display
11-1-3. Discharge temperature disconnection
An alarm occurs if the discharge temperature doesn't change by 2℃ or more when 10 – 30* minutes have
passed since the compressor started.
* When the ambient temperature is lower than approx 5℃, it is 30 minutes.
* When the ambient temperature is higher than approx 5℃, it is 10 minutes.
Compressor No.
Type
Alarm display
11-2. Current Protection
11-2-1. Inverter compressor and inverter fan moter
Alarm
Occurs during operation when overcurrent is detected. Secondary current of inverter compressor and
P16
primary current are limited. The fan motor current is included in primary current.
Occurs when missing phase or overcurrent is detected at inverter compressor
P29
start. (the alarm at frequencies below 25Hz)
Occurs when HIC detects overcurrent, or when an abnormal high temperature (150 ℃) is reached.
H31
Compressor 1 Compressor 2
Inverter Constant-speed
106°C
70°C
P03
Compressor 1 Compressor 2
Inverter Constant-speed
F04
Compressor 1 Compressor 2
Inverter Constant-speed
H05
Control Functions - Outdoor Unit
Compressor 3
Constant-speed
106°C 106°C
70°C 70°C
P17 P18
Compressor 3
Constant-speed
F05 F22
Compressor 3
Constant-speed
H15
Description
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2WAY SYSTEM
H25