Daikin RZQ Series FCQ20EVA Service Manual page 46

Function Details
4.2.10 Low Pressure Protection Control
In order to prevent abnormal low pressures in the system, the below control function will be activated. Low
pressure is detected by the low pressure sensor.
 RZQ20/24LVA
(When cooling operation)
Normal operation
Lp < 0.12MPa
Compressor upper limit
frequency
10 times or less
stopping in 200 minutes
37
Lp > 0.15MPa for
30 seconds
57 Hz
Lp < 0.12MPa for
5 minutes
Compressor stop: 0 Hz
Stopped 11 times in 200 minutes
Abnormal stop (
(When heating operation)
Normal operation
• Within 10 minutes
after defrosting
• OR
• LPS activates
&
continuous for 5
minutes.
• Lp < 0.12MPa
Lp < 0.12MPa for
10 seconds
Lp < 0.12MPa for
1 minute
E4
indication)
∗ Condition A: &
SiME281501E
Lp > 0.15MPa for
1 minute
Compressor upper
Condition A∗
limit frequency
20 steps
Lp > 0.15MPa for
10 seconds
Compressor upper
Condition A∗
limit frequency
10 steps
Lp > 0.15MPa
Compressor upper
Condition A∗
limit frequency
57 Hz
• After 5 minutes after starting
• OR
• After 10 minutes after defrosting
• Lp > 0.15 MPa for 1 minute
Function and Control