Daikin FTXD50JV1B [45/164] Peak cut control function

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