12.10 Compressor Protection Control (Gas leak detection control 1)
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Control start conditions
For 5 minutes, the compressor continuously operates and total current is low.
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During Cooling or Soft Dry operation:
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Indoor intake temperature — indoor piping temperature is below 39.2°F.
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Control content
Compressor stops (and restart after 3 minutes)
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If the conditions above happen 4 times within 60 minutes, the unit will stop operation ("F91" is indicated).
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12.11 Compressor Protection Control (Gas leak detection control 2)
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This control detect gas leakage condition to prevent compressor damage.
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Control start condition
All connected indoor units capability supply ON.
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Compressor ON with maximum frequency.
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Compressor discharge temperature high.
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Control content
Compressor OFF during this control ("F91" is memorized in EEPROM)
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If the above conditions happen 2 times within 60 minutes, indoor units' Timer LED will blinks ("F91" is
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indicated at all indoor units)
12.12 Valve close detection control
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This control detects 3-way valve close condition to prevent damage to refrigerant cycle.
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Start conditions:
For all connected indoor units, if Indoor intake temperature — indoor piping temperature are between 28.4°F
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and 35.6°F continuously for 5 minutes after compressor ON at first cooling operation.
The first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installation
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or after pump down.
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Control content
During this control, compressor stop, indoor units' Timer LED will blink. ("F91" is indicated at indoor units)
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Error reset can be done by power supply reset or reset by using remote control.
12.13 Compressor discharge high pressure protection control
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This control protect by using high pressure switch during operation.
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Start conditions
High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling
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during compressor running.
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Control 1 content
Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If this
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condition happen 4 times within 30 minutes, "F94" is indicated.
After 30 minutes, counter is reset if this condition does not happen for 4 times.
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Control 1 stop conditions
Power supply reset
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Reset by using remote control
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