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19.11 IPM (power transistor) Protection Control
Overheating Prevention Control
o
If IPM temperature rises to 80°C, outdoor fan speed will be increased.
o
When the IPM temperature rises to 95°C, compressor operation will stop immediately.
o
Compressor operation restarts when temperature decreases to 90°C.
o
If IPM temperature detected less than -30°C, IPM is judged as open circuit (“F96” is indicated).
DC peak current control
o
When IPMDC current exceeds set value of 40 ± 3.0 A, the compressor will stop.
o
If the DC peak current detected within 30 seconds after operation starts, compressor will restart after
1 minute.
o
If the DC peak current detected 30 seconds or more after operation starts, compressor will restart after
2 minutes.
o
Within 30 seconds after compressor restarts, if the DC peak current is exceeded set value continuously for
7 times, all indoor and outdoor relays will be cut off (“F99” is indicated).
Error reset can be done by power supply reset.
19.12 Compressor Protection Control (Gas leak detection control 1)
Control start conditions
o
For 5 minutes (cool & dry), 8 minutes (heating), the compressor continuously operates and total current is
low.
o
High pressure < 21kgf/cm
2
.
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 2°C.
o
Not during deice control.
o
Compressor ON with maximum frequency.
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).
19.13 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
Not during annual cooling.
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)
19.14 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°C
and 2°C continuously for 8 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.
