Panasonic CU-5E34NBE-C Technical & Service Manual

Also see for CS-ME12NKE: Operating instructions Technical & service manual Operating instructions

Contents

Panasonic CU-5E34NBE-C Technical & Service Manual Manual pdf 21 page image

217-2. Protective Functions7-2-1. Defrost Detection and Release(2) Clean defrostIf all indoor units are stopped during HEAT operation, and frost is detected at the L1 line, and theconditions for defrost are met, then defrost operation occurs, and the unit stops after defrost is completed.(1) Non-stop defrostingHeating operationNOTE Defrost does not occur during HIGH POWER operation.If other stopped indoor units are started during defrost operation, they begin operating indefrost mode.Frost detectionNon-stop defrostingReleasing of defrostingDefrosting sequence 4-way valve ONDefrost detection occurs in either of the following cases:• The temperature of the heat exchanger remains at or belowthe L1 line for 35 minutes after the start of HEAT operation.••••CompressorOutdoor fanSolenoid valve(for hot gas bypass)• Temperature of the outdoor heat exchanger is at or above thetemperature shown in the table below.Temperature of releasing*1 The temperature for releasing of defrosting is (20 °C) or higher when theoutdoor air temperature is less than 0 °C.• Defrost operation has continued for 12 minutes (max. length).Indoor fan(70 Hz) operation (4-way valve ON)OFFONOFF• The temperature of the heat exchanger remains at or belowthe L2 line for 120 minutes after the start of HEAT operation.• Accumulated 2 hours have passed with the coil temperatureof -2 °C or less.Outdoor heatexchanger temperatureOutdoor airtemperature(–20) 0(– 6)(– 7)(– 16)(– 25)L2L1Defrost operation timeHeat exchangertemperature forreleasing defrostingLess than 2 minutes 2 minutes or moreNo releasing 14 °C or higher (*1)