Specifications

Control Specification SiBE04-624
68 Function and Control
3.8 Peak-cut Control
Outline In heating operation, malfunctioning of the unit (for example dirty filters) can cause the
discharge pressure to rise excessively and reach unacceptable levels. To avoid this, peak-cut
control will monitor the condensing temperature and when necessary decrease the operating
frequency in an attempt to lower the discharge pressure at an early stage.
Detail In a similar way as with the freeze protection function, the peak-cut control function regulates
the maximum operation frequency as indicated in the picture underneath.
Fig. : Peak-cut control function graph
When recovering from a total stop (return area) :
z
Frequency settings remain unchanged.
Up-area:
z
The maximum frequency increases with approximately 2Hz every 2 minute.
Steady area:
z
The maximum frequency remains constant.
Step down area:
z
The maximum frequency decreases with approximately 4Hz every 20sec.
Stop area:
z
The compressor, indoor fan and outdoor fan will stop.
Heat exchanger
thermistor temperature
65˚C
56˚C
53˚C
51˚C
46˚C
Stop area
Step down area
Steady area
Up area
Return area
(R5910)