General Functionality
Si04-115
36
Main Function
1.15
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 (saturation temperature
equivalent to head pressure).
Processing
∗
J type makes DP1 ~ DP4 increase 2°C in POWER FULL heating operation.
∗
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 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
Heat exchanger temp. DC
Heat exchanger temp. DC
DP4
DP3
DP2
DP1
∗
This function has not time guard.
(R1921)
