Elba R410A Guía para resolver problemas descargar pdf (Pagina 130)

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Only for training and service purposes

LGE Internal Use Only

Outdoor Units

3. Protection control

3.1 Discharge Temperature control

3.1.1 Discharge pipe control for Inverter compressor

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.

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.

System will stop if this situation occurs 5 times in 1 hour and error code will be generated.

Expansion

valve

Pulse Up

COMP

Toff(105)°C

T1(90)°C

T2(95)°C

5 Hz

Down

5 Hz

Down

OFF

Set

D-Pipe temp

Stop control

Set

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Elba R410A Guía para resolver problemas Pagina 130