User Guide

Part 3 Control logic
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Only for training and service purposes
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1) There can be two situations
a) Sensor is failed (error code for sensor failure will be generated)
b) Abnormal high temperature discharge temperature (error code for high discharge will be generated)
Both cases unit will stop.
Compressor working
1. If discharge pipe temperature < T1 No limitation on compressor frequency
2. T2 ≤ discharge pipe temperature < Toff (Hysteresis control) Compressor frequency down by 5 pulse & Expansion
valve up by 10 pulse in every 1 min. If LEV is in the starting control it will follow starting control first.
3. discharge pipe temperature ≥ Toff then compressor will be OFF System will stop if this situation occurs 5 times in 1
hour and error code will be generated also self diagnosis will start.
4. Discharge pipe control
Discharge pipe temp.
Expansion valve Set
COMP Hz
T1:90 (Option)˚C
T2:95 (Option)˚C
5Hz(Option)
Down
10 pulse
(Option) up
5Hz
(Option)
Down
10 pulse
(Option) up
OFF SetSet
Set
Stop control
Set
Set
Toff:105(Option)˚C