SiBE04-101
General Functions
Main Function
37
1.16
Peak-Cut Control Function
Outline
In a heating operation, there will be anxiety that a head pressure excessively increases and exceeds the
permissible limit in an over load conditions.
For avoiding this fact, when the head pressure increases, frequency step down control is carried out for the
protection so that the head pressure will not exceed the permissible limit after detecting the temperature of
the indoor unit’s heat exchanger.
Details of the
Control
In heating operation, the indoor heat exchange temperature is regarded as condensation temperature
to anticipate a high pressure, and such a high pressure is prevented by dropping the frequency before
the pressure rises higher than necessary.
∗
In powerful operation, the temperature of DP1 to DP4 is raised by 1˚C.
∗
DP : Peak cut temperature of heat exchanger
The restriction for frequency is not conducted in the return area by means of peak-cut control.
Frequency is increased approximately every 2 Hz/min. in the up-area.
Frequency alteration in the steady area is not conducted.
Frequency - down is carried out in the step down area approximately every 2 ~ 4 Hz/20sec..
Compressors stop in the stop area.
Setting a constant
J type
DP0
67˚C
DP1
56˚C
DP2
54˚C
DP3
53˚C
DP4
46˚C
Stop area
Step down
area
Return area
Up-area
Steady area
DP0
at the descent of
heat exchanger temp.
at the ascent of
heat exchanger temp.
DP4
DP3
DP2
DP1
∗
This function has not time guard.
(R1229)
SiBE04-101.book Page 37 Monday, October 15, 2001 3:08 PM
