Peak-Cut Control Function - Daikin FTK25JVE9 Service Manual

General Functionality
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
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∗
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"
"
"
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36
DP0
DP1
DP2
DP3
DP4
Heat exchanger temp. DC
Setting a constant
DP0
DP1
DP2
DP3
DP4
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.
Stop area
∗ This function has not time guard.
Step down
area
Steady area
Up-area
Return area
Heat exchanger temp. DC
J type
67°C
56°C
54°C
53°C
46°C
Si04-115
(R1921)
Main Function