Peak-Cut Control Function (H / J Type) - Daikin FTK25JV1NB Manual

Si-86.book Page 29 Friday, June 23, 2000 10:26 AM
SIE-86

1.15 Peak-Cut Control Function (H / J Type)

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. There is no change in H
∗ DP : Peak cut temperature of heat exchanger
Main Function
DP0
DP1
DP2
DP3
DP4
Heat exchanger temp. DC
Setting a constant
DP0
DP1
DP2
DP3
DP4
type even if POWER FULL is applied.
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.. (2 Hz for H
type, 4 Hz for J type)
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
H type J type
67˚C 67˚C
58˚C 56˚C
56˚C 54˚C
55˚C 53˚C
48˚C 46˚C
General Functionality
(RL025)
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