CS-E21JB4EA, CU-E21HBEA - Panasonic Air Conditioner Service Manual (repair manual). Page 65

65

• During cooling, compressor frequency = Fcmax.
• During heating, compressor frequency > Fhrated.
• During cooling and heating operation, running current: 0.65A < I < 1.65A.
• During cooling, indoor intake - indoor pipe < 4

°C.

• During heating, indoor pipe - indoor intake < 5

°C.

Multi Models Only

- Gas shortage detection 1: A gas shortage is detected by checking the CT-detected input current value and the compressor

running frequency. During startup and operating of cooling and heating, input current < 8.78/256 (A/Hz) 

× compressor

running frequency + 0.25.

- Gas shortage detection 2: A gas shortage is detected by checking the difference between indoor pipe temperature and indoor

intake air temperature during cooling and heating.

• Refrigerant shortage (refrigerant leakage).
• Poor compression performance of compressor.
• 2/3 way valve closed.
• Detection error due to faulty indoor intake air or indoor pipe temperature sensors.