Troubleshooting Guide; Refrigeration Cycle System - Panasonic CU-Z20VKE Series Installation Instruction

18. Troubleshooting Guide

18.1 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.
Difference in the intake
and outlet
air temperatures
Less than 8°C at the cooling mode
Less than 14°C at the heating mode.
Value of electric
current during operation
Lower than specified
Gas side
pressure
More than 8°C
(15 minutes after an
operation is started.)
at cooling mode.
Above 14°C
(15 minutes after an
operation is started.)
at heating mode.
Higher than specified
Cooling Mode High
Low
Low
Low
Heating Mode
Low
High
Normal Pressure and Outlet Air Temperature (Standard)
Cooling Mode
Heating Mode 2.0 ~ 2.7 (20 ~ 27)
*Condition: • Indoor fan speed = High
Normal
Dusty condenser
preventing heat radiation
Excessive amount
of refrigerant
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary tube
Inefficient compressor
Insufficient refrigerant
Clogged strainer, capillary
tube or expansion valve
108
Gas Pressure
MPa Temperature
2
(kg/cm G)
0.9 ~ 1.2 (9 ~ 12)
• Outdoor temperature 35°C at the cooling
mode and 7°C at the heating mode
• Compressor operates at rated frequency
• Measuring the air temperature
difference
• Measuring electric current
during operation
•
Measuring gas side pressure
Outlet air
(°C)
13 ~ 17
32 ~ 42