Discharge Pipe Temperature Control - LG AH-W096A0 Service Manual

4. Discharge pipe temperature control

1) There can be two error situations for discharge pipe temperature.
a) Sensor is failed (error code for sensor failure will be generated)
b) Abnormal high temperature at discharge pipe (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. T1°C ≤ discharge pipe temperature < T2°C ¡ Compressor frequency stop increasing & Expansion valve up by ß
pulse
T2 ≤ discharge pipe temperature < Toff (Hysteresis control) ¡ Compressor frequency down by
valve up by ß pulse in every 30 second.
If EEV is in the starting control it will follow starting control first.
3. Discharge pipe temperature ≥ Toff then compressor will be OFF and System will stop if this situation occurs 10 times
in 1 hour and error code will be generated also self diagnosis will start.
Toff °C
COMP Hz
Expansion valve
Model
AHUW166A0
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Discharge pipe temp.
T2 °C
T1 °C
Frequency
Hz
Set
fixed
Down
ß‚ Pulse Up
Set
T2
95°C
Frequency
Hz
OFF
fixed
Down
Stop control
°C
Toff Hz
105°C 5
- 34 -
Control logic
a pulse & Expansion
Set
OFF
Set
EEV ß‚ pulse
8
LGE Internal Use Only