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ESIE15-13B Function Details

Function and Control 43

3.2.14 Suction Pipe Superheat Protection Control (Only in Heating

Operation)

In case the suction superheat value in heating mode is too high, the oil return to the compressor

will be insufficient. In order to avoid that the compressor oil will be accumulated in the outdoor

unit heat exchanger, the upper limit frequency will be controlled.

SH: Superheat degree

EV: Electronic expansion valve

Normal operation

• Suction SH > 12°C

• Suction SH < 8°C

• Suction SH < 10°C

• EV opening degree < 450 pls

• Suction SH > 10°C

• EV opening degree = 480 pls

• Suction SH < 4°C

• Suction SH < 8°C

• Suction SH < 10°C

• EV opening degree < 450 pls

• Upper limit frequency = Maximum frequency

• Suction SH > 12°C

• Suction SH > 10°C

• EV opening degree = 480 pls

Lowering upper limit frequency

for 1 step every 20 seconds

Raising upper limit frequency for

1 step every 20 seconds

• &

• OR

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