Panasonic U-8ME1E8E Service Manual page 40

11. Alarm Information
List of overcurrent
Secondary [ A ]
Primary [ A ]
11-2-2. Constant-speed compressor
An alarm occurs when overcurrent or lock current is detected.
List of overcurrent and lock currents
Overload current [ A ]
Lock current [ A ]
List of Alarms
Compressor No.
Detected current
Alarm display
11-2-3. CT circuit detection trouble
Compressor 1
(inverter compressor)
Compressor 2
Compressor 3
If the inverter compressor operating frequency is low, the current value is also low. Therefore this alarm is
detected only when the compressor is stopped.
The operating current of the constant-speed compressors is always higher than 1.5 A. Therefore, this alarm
occurs as the result of an open circuit or failure.
11-3. Pressure Sensor Failure
This system contains 2 types of pressure sensors: a high-pressure sensor and a low-pressure sensor.
11-3-1. High-pressure sensor failure
An alarm occurs when the high-pressure sensor becomes an electrical open-circuit or a short-circuit condi-
tions, and a broken wiring, short-circuit or poor connection to the PCB in the high-pressure sensor circuit for 30
seconds.
Alarm display
11-3-2. Low-pressure sensor failure
An alarm occurs when the low-pressure sensor becomes an electrical open-circuit or a short-circuit condi-
tions, and a broken wiring, short-circuit or poor connection to the PCB in the low-pressure sensor circuit for 30
seconds.
Alarm display
Inverter 6HP
18.0
18.0
Constant-speed 5HP
13.6
16.1
Compressor 2
Over current Lock current
H11 H12
Alarm
H03 Occurs when an open CT circuit is detected in the inverter compressor.
Occurs when an open CT circuit is detected in the constant speed
compressor.
H13
Occurs when a current value of 1.5A or less is detected when the constant-
speed compressor is operating.
Occurs when an open CT circuit is detected in the constant speed
compressor.
H23
Occurs when a current value of 1.5A or less is detected when the constant-
speed compressor is operating.
High-pressure sensor failure
F16
Low-pressure sensor failure
F17
Control Functions-Outdoor Unit
Inverter 10HP
21.0
23.0
Constant-speed 6HP
16.3
19.3
Compressor 3
Over current
H21
Description
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2WAY SYSTEM
Lock current
H22
1