MXS Service Manual

SiUS121736EA Control Specification
Functions and Control 100
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 operation room is changed.
 The maximum value of the indoor heat exchanger temperature controls the following (excluding
stopped rooms).
A 65°C (149°F)
B 55°C (131°F)
C 54°C (129.2°F)
D 52°C (125.6°F)
E 50°C (122°F)
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.
Indoor heat exchanger
temperature
Stop zone
Dropping zone
Keep zone
Up zone
Reset zone
(R23928)
D
C
B
A
E
F (seconds)
30
2
When increase
When decrease