Panasonic CU-3TZ52TBE Service Manual

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Panasonic CU-3TZ52TBE Service Manual Manual pdf 39 page image

3914.13 Compressor Protection Control (Gas leak detection control 1) Control start conditionso For 5 minutes, the compressor continuously operates and total current is low.o During Cooling or Soft Dry operation:Indoor intake temperature — indoor piping temperature is below 4°C.o During Heating operation:Indoor pipe temperature — indoor intake temperature is below 3°C.o Not during deice control.o Compressor ON with maximum frequency. Control contento Compressor stops (and restart after 3 minutes)o If the conditions above happen 4 times within 60 minutes, the unit will stop operation (“F91” is indicated).14.14 Compressor Protection Control (Gas leak detection control 2) This control detect gas leakage condition to prevent compressor damage. Control start conditiono All connected indoor units capability supply ON.o Compressor ON with maximum frequency.o Not during annual cooling.o Compressor discharge temperature high. Control contento Compressor OFF during this control (“F91” is memorized in EEPROM)o If the above conditions happen 2 times within 60 minutes, indoor units’ Timer LED will blinks (“F91” isindicated at all indoor units)14.15 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 -2°Cand 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.14.16 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