SiUS121827E Control Specification
Part 4 Functions and Control 113
4.8 Heating Peak-cut Control
Outline During heating operation, the indoor heat exchanger temperature determines the frequency upper
limit to prevent abnormal high pressure.
Details The operating frequency is judged with the indoor heat exchanger temperature 2 minutes after
the operation starts and F seconds after the number of the rooms in operation is changed.
The maximum value of the indoor heat exchanger temperature controls the following (excluding
the rooms not in operation).
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.
A 62.5°C (144.5°F)
B 54°C (129.2°F)
C 53°C (127.4°F)
D 51°C (123.8°F)
E 49°C (120.2°F)
F (seconds)
When increase 30
When decrease 2
Indoor heat exchanger
temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
(R23928)
D
C
B
A
E
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