Panasonic CS-E18SD3UAW service manual - Page 67

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. Normal Pressure and Outlet Air Temperature (Standard) Gas pressure PSI (kg/cm2G) Outlet air temperature (°F) Cooling Mode Heating Mode 130.53 ~ 174.04 (9 ~ 12) 333.58 ~ 420.60 (23 ~ 29) 53.6 ~ 60.8 96.8 ~ 113 *Condition: • Indoor fan speed; High • Outdoor temperature 95°F at cooling mode and 44.6°F at heating mode • Compressor operates at rated frequency Difference in the intake and outlet air temperatures More than 14.4°F (15 minutes after an operation is started.) at cooling mode. Above 25.2°F (15 minutes after an operation is started.) at heating mode. Less than 14.4°F at the cooling mode Less than 25.2°F at the heating mode Value of electric current during operation Higher than specified Normal Dusty condenser preventing heat radiation Excessive amount of refrigerant • Measuring the air temperature difference • Measuring electric current during operation Lower than specified Gas side pressure Cooling Mode High Low Low Low Heating Mode Low Low Inefficient compressor Insufficient refrigerant Clogged strainer or capillary tube Inefficient compressor Insufficient refrigerant Clogged strainer or capillary tube • Measuring gas side pressure 67