High Pressure Protection Control - Daikin RZQ100B8V3B Service Manual

ESIE05-03
3.3.4

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 RZQ100~140, low pressure is a calculated value.
Flow chart
Parameters
A Hz
B Hz
C bar
D bar
E bar
F bar
G bar
H bar
I bar
Part 2 – 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)
Hp < (G) bar
Hp > (C) bar
Compressor operation
frequency +1 step/1 min
Hp < (H) bar
OR
Compressor operation
frequency +1 step/5 min
• HPS activates
&
• Stopped 16 times in
300 minutes
Malfunction stop (E3 indication)
RZQ71B
79 Hz
62 Hz
RZQ71B
35.3 bar
36.3 bar
38.2 bar
34.8 bar
32.9 bar
33.8 bar
38.2 bar
Outdoor Unit Functional Concept
(When heating operation)
Normal operation
• Hp < 3.24Mpa
&
• 30 sec elapsed
Compressor operation
frequency B Hz
15 times or
• Hp > (E) bar* less stop-
ping in 300
• HPS activates
minutes
Compressor stop
Note: (E) bar* = (E) bar for 1 minute
RZQ100~140B
58 Hz
58 Hz
RZQ100~140B
35.3 bar
36.3 bar
38.2 bar
34.8 bar
32.9 bar
33.8 bar
38.2 bar
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