12.10 Compressor Protection Control (Gas leak detection control 1)
•Control start conditions
o 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 39.2°F.
•Control content
o 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).
12.11Compressor Protection Control (Gas leak detection control 2)
•This control detect gas leakage condition to prevent compressor damage.
•Control start condition
o All connected indoor units capability supply ON. o Compressor ON with maximum frequency.
o Compressor discharge temperature high.
•Control content
o 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” is indicated at all indoor units)
12.12 Valve close detection control
•This control detects
•Start conditions:
o For all connected indoor units, if Indoor intake temperature — indoor piping temperature are between 28.4°F and 35.6°F 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 installation or after pump down.
•Control content
o 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.
12.13 Compressor discharge high pressure protection control
•This control protect by using high pressure switch during operation.
•Start conditions
o High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling during compressor running.
•Control 1 content
o Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If this condition 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 conditions o Power supply reset
o Reset by using remote control
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