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Only for training and service purposes
Part 2 Functions & Controls
5.11.2 Inverter Compressor (18,24,30kBtu/h Model)
1) There can be two situations
(a) Temperature sensor is failed (Error Code 41)
(b) Abnormal high temperature discharge temperature (error code for high discharge will be generated)
Both cases unit will stop.
2) Compressor working
(a) If discharge pipe temperature < T1 No limitation on compressor frequency
(b) T2 ≤ discharge pipe temperature < T off, (Hysteresis control) Compressor frequency down by 5Hz and
expansion valve up by 10 pulse in every 1 min.
(c) Discharge pipe temperature ≥ Toff, Compressor will be off
System will stop if this situation occurs 5 times in 1 hour and error code will be generated.
Expansion
valve
10
Pulse Up
10
Pulse Up
COMP
Hz
Toff(105)°C(221°F)
T1(90)°C(194)°F
T2(95)°C(203)°F
5 Hz
Down
5 Hz
Down
OFF
Set
Set
Discharge pipe temp.
Stop control
Set
Set
Set