Panasonic CU-4E24RBU Service Manual

Also see for CU-3E19RBU: Operating instructions Service manual Service manual Service manual Installation manual

4813.15 Valve close detection control This control detects 3-way valve close condition to prevent damage to refrigerant cycle. Start conditions:o For all connected indoor units, if Indoor intake temperature — indoor piping temperature are between 28.4°F(-2°C) and 35.6°F (2°C) continuously for 5 minutes after compressor ON at first cooling operation.o The first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installationor after pump down. Control contento During this control, compressor stop, indoor units’ Timer LED will blink. (“F91” is indicated at indoor units) Error reset can be done by power supply reset or reset by using remote control.13.16 Compressor discharge high pressure protection control This control protect by using high pressure switch during operation. Start conditionso High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling orheating during compressor running. Control 1 contento Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If thiscondition happen 4 times within 30 minutes, “F94” is indicated.o After 30 minutes, counter is reset if this condition does not happen for 4 times. Control 1 stop conditionso Power supply reseto Reset by using remote control