Panasonic CS-A28JKD / CU-A28JKD Service Manual ▷ View online
49
15 Troubleshooting Guide
15.1. Refrigeration Cycle System
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table on the right.
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table on the right.
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15.1.1.
Relationship between the condition of the air conditioner and pressure and electric
current
current
• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.
15.1.2.
Diagnosis methods of a malfunction of a compressor and 4-Way Valve
Cooling Mode
Heating Mode
Low Pressure
High Pressure
Electric current
during operating
Low Pressure
High Pressure
Electric current
during operating
Condition of the air
conditioner
Insufficient refrigerant
(gas leakage)
Clogged capillary tube
or Strainer
Short circuit in the
indoor unit
Heat radiation deficiency
of the outdoor unit
Inefficient compression
Nature of fault
Symptom
Insufficient compressing of a compressor
• Electric current during operation becomes approximately 20% lower than the normal value.
• The discharge tube of the compressor becomes abnormally hot (normally 70 to 90°C).
• The difference between high pressure and low pressure becomes almost zero.
Locker compressor
• Electric current reaches a high level abnormally, and the value exceeds the limit of an
ammeter. In some cases, a breaker turns off.
• The compressor has a humming sound.
Insufficient switches of the 4-way valve
• Electric current during operation becomes approximately 80% lower than the normal value.
• The temperature different between from the discharge tube to the 4-way valve and from
suction tube to the 4-way valve becomes almost zero.
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16 Disassembly and Assembly Instructions
16.1. Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor
Removal Procedures
16.1.1.
To remove Front Grille
16.1.2.
To remove horizontal vane
WARNING
High Voltage is generated in the electrical parts area by the capacitor. Ensure that the capacitor has discharged sufficiently before
proceeding with repair work. Failure to heed this caution may result in electric shocks.
proceeding with repair work. Failure to heed this caution may result in electric shocks.
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16.1.3.
To remove electronic controller
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