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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).
12.11 Compressor 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 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
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
