Discharge Pipe Control - LG Single "A" Service Manual

Part 3 Control logic

4. Discharge pipe control

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 £º T1 No limitation on compressor frequency
2. T2 ≤ discharge pipe temperature £º 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.
Toff:105(Option)˚C
T2:95
(Option)˚C
T1:90 (Option)˚C
COMP Hz
Expansion valve
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Discharge pipe temp.
5
Hz(Option)
Set
Down
10 pulse
Set
(Option) up
- 58 -
5
Hz
Set
(Option)
Down
10 pulse
Set
Stop control
(Option) up
OFF Set
Set
LGE Internal Use Only