Algorithm & Control
27
2.19 High Pressure Protection
To prevent high pressure in the system.
Compressor operating frequency is adjusted based on upper limit of coil temperature.
Upper Limit Coil
Temperature
Compressor frequency
A
64°C
B
C
The compressor frequency is adjusted based on coil temperature:
•
During cooling mode : outdoor coil temperature.
•
During heating mode : indoor coil temperature.
This protection is activated when the coil temperature > 64°C, the compressor stops and outdoor fan stops
after 30s.The unit can only be restarted after 3 minutes.
2.20 Discharge Pipe Temperature Control
Used as a measure of the compressor’s internal temperature.
Compressor frequency is control to keep this temperature from going up further when it rises above a certain
level.
Discharge temperature
Stop zone
Drop zone
Frequency
keep zone
Reset zone
110°C
102°C
99°C
90°C
If compressor discharge temperature > 102°C for the first time, this control starts and sets the current
frequency as upper limit. At the same time, running frequency starts to reduce by 1 step and so on, until
temperature falls between 99°C and 90°C at the keep zone.
This protection is activated when the compressor discharge temperature > 110°C. The compressor will stop
and considered trip.
If the compressor discharge temperature < 90°C , the compressor frequency will be reset based on the
outdoor ambient, set and room temperature.
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