SiUS12-928_B
Control Specification
Function and Control
60
3.7
Heating Peak-cut Control
Outline
During heating operation, the indoor heat exchanger temperature determines the frequency upper
limit to prevent abnormal high pressure.
Detail
The operating frequency is judged with the indoor heat exchanger temperature 2 minutes after
the operation starts and
F
seconds after the number of operation room is changed.
The maximum value of the indoor heat exchanger temperature controls the following (excluding
stopped rooms).
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.
18 class
24/32 class
A
149°F (65°C)
149°F (65°C)
B
122°F (50°C)
129.2°F (54°C)
C
118.4°F (48°C)
127.4°F (53°C)
D
117.5°F (47.5°C)
123.8°F (51°C)
E
115.7°F (46.5°C)
120.2°F (49°C)
Indoor heat exchanger
thermistor temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
(R14645)
D
˚C
C
˚C
B
˚C
A
˚C
E
˚C
F
(seconds)
30
2
When increase
When decrease
