Troubleshooting Guide - Panasonic CS-A120TE Service Manual

Troubleshooting Guide

Refrigeration cycle system
In order to diagnose malfunctions, make sure that
there are no electrical problems before inspect-
ing the refrigeration cycle. Such problems include
insufficient insulation, problem with the power source,
malfunction of a compressor or a fan.
The normal outlet air temperature and pressure
of the refrigeration cycle depends on various condi-
tions; 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 cooling mode
Less than 14°C at heating mode
Value of electric
current during operation
Lower than specified
Gas side
pressure
Above 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
Low
Normal Pressure and Outlet Air Temperature (Standard)
Cooling mode
Heating Mode
1.5 ~ 2.1 (15 ~ 21)
Condition: Indoor fan speed; High
Outdoor temperature is 35°C at cooling mode
and 7°C at heating mode
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 or
capillary tube
– 20 –
CS-A120TE
Gas pressure Outlet air
MPa temperature
(kg/cm 2 G)
(°C)
0.4 ~ 0.6 (4 ~ 6)
12 ~ 16
36 ~ 45
Measure the air temperature
difference
Measure the electric current
during operation
Measure the gas side pressure