Service Manual

SiUS041638E Control Specification

Functions and Control 40

3.6 Freeze-up Protection Control

During cooling operation, the signal sent from the indoor unit determines the frequency upper limit

and prevents freezing of the indoor heat exchanger. (The signal from the indoor unit is divided into

zones.)

The operating frequency limitation is judged with the indoor heat exchanger temperature.

3.7 Heating Peak-cut Control

During heating operation, the indoor heat exchanger temperature determines the frequency upper

limit to prevent abnormal high pressure.

The operating frequency limitation is judged with the indoor heat exchanger temperature.

(R24574)

Reset zone

Indoor heat exchanger

temperature (R2T)

Up zone

Keep zone

Dropping zone

Stop zone

13˚C (55.4˚F)

7˚C (44.6˚F)

5˚C (41.0˚F)

3˚C (37.4˚F)

0˚C (32.0˚F)

RX30/36NMVJU

(°C) (°F)

A 60 140.0

B 57 134.6

C 54 129.2

D 52 125.6

E 47 116.6

Zone Control

Stop zone When the temperature reaches the stop zone, the compressor stops.

Dropping zone The upper limit of frequency decreases.

Keep zone The upper limit of frequency is kept.

Up zone The upper limit of frequency increases.

Reset zone The upper limit of frequency is canceled.