High Pressure Protection Control - Daikin SkyAir Service Manual

SiBE28-804
4.5

High Pressure Protection Control

Outline In order to prevent abnormal high pressures in the system and hence avoiding activation of the
high pressure safety device the below control function will be activated.
Details The high pressure value will be calculated from the low pressure, power input and compressor
frequency. In case of RZQ100~140C7, RZQS125·140C7, low pressure is a calculated value.
Flow chart
Parameters
As the bearing resistance limit pressure decreases during slow operation of the compressor, the
lower limit of frequency is restricted.
Functional Description
HPS opens at : 40 bar (tolerance: +0 / -0.15)
HPS closes at : 30 bar (tolerance : +/- 0.15)
(When cooling operation)
Normal operation
Hp > (C) bar
Compressor operation
frequency –1 step/10 sec
Hp > (D) bar
Compressor operation
frequency A Hz
Hp < (F) bar
• HPS activates
OR
• Hp > (E) bar for
1 minute
Compressor stop
• HPS activates
OR
• Stopped 16 times
in 300 minutes
Malfunction stop (E3 indication)
RZQ71C7,
RZQS71·100C7V3B
A Hz 118.5 Hz
B Hz
C bar 32.2 bar
D bar 33.2 bar
E bar 39.2 bar
F bar 31.8 bar
G bar 29.4 bar
H bar 30.8 bar
I bar 39.2 bar
[In cooling/heating operation]
Normal operation
Hp < (G) bar Hp > (C) bar
Compressor operation
frequency +1 step/1 min
Hp < (H) bar
Compressor operation
frequency +1 step/5 min
• HPS activates
&
• Stopped 16 times in
300 minutes
93 Hz
Hp ≥ 3.04MPa
Hp ≤ 2.84MPa
After 30 seconds
Frequency Regulating Functions
(When heating operation)
Normal operation
• Hp < 3.24Mpa
&
• 30 sec elapsed
Compressor operation
frequency B Hz
• Hp > (I) bar
OR
• HPS activates
Compressor stop
Malfunction stop (E3 indication)
RZQ100~140C7,
RZQS125·140C7V1B
62 Hz
62 Hz
36.8 bar
37.7 bar
39.2 bar
36.3 bar
34.3 bar
35.8 bar
39.2 bar
Compressor frequency lower limit
48Hz (RZQ71, RZQS71·100)
61.5Hz (RZQ100~140, RZQS125·140)
15 times or
less stop-
ping in 300
minutes
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