Daikin RZQ100B8V3B Service Manual page 131

ESIE05-03
3.3.3 Low Pressure Protection Control (RZQ71)
Outline In order to prevent abnormal low pressures in the system, the below control function will be activated.
Low pressure is measured by the low pressure sensor.
Flow chart
10 times or less
stopping in 200 minutes
Parameters
A Hz
B Hz
C HZ
Part 2 – Functional Description
(When cooling operation)
Normal operation
• Lp > 0.59 Mpa
Lp < 0.49
&
• 30 sec elapsed
MPa
Compressor upper limit
frequency
C Hz
LP < 0.1 MPa continues
for 5 minutes
Compressor stop: O Hz
Stopped 11 times in 200 minutes
Malfunction stop (E4 indication)
RZQ71B
128 Hz
67 Hz
38 Hz
(When heating operation)
• Within 5 minutes after defrosting
&
• Lp < 0.1 MPa continuously
Normal operation
• Within 5 minutes after
starting
• Within 10 minutes after
• OR
&
defrosting
• Lp < 0.15 Mpa
Lp < 0.1 MPa
Condition D* : &
Outdoor Unit Functional Concept
LP > 0.25 MPa
Upper limit A Hz
LP > 0.2 MPa
Copmressor upper
Condition D*
limit frequency
B Hz
LP > 0.15 MPa
Compressor upper
Condition D*
limit frequency
C Hz
10 times or less stopping
in 200 minutes
• Within 5 minutes after starting
• After 10 minutes after defrosting
• OR
• Lp > 0.25 Mpa
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