HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
HRS Series 3.3 Troubleshooting
AL09: Circulating fluid discharge pressure drop
<Detection method> This alarm goes off when the pressures detected by the circulating fluid pressure
sensor (for discharge) is 0.05 MPa or less (change in the values acceptable).
Is AL07 being generated?
Y
N
Y
Refer to the section "AL25:
Circulating fluid discharge
pressure sensor failure".
Is AL25 being generated?
Y
N
Has the value been changed
from the default setting?
Y
1.
Check the external piping.
Remove any causes of the
problems.
N
Normal
Error
Circulating fluid discharge
pressure drop
AL09
Refer to section "AL07: Pump
operation failure".
Refer to section "AL07: Pump
operation failure".
1. Check the external piping.
Check if the external piping is in the conditions shown below:
(1) Valve opening has been changed.
(2) A valve or a switching valve is mounted to the external piping, and they reduce the piping
resistance temporarily.
(3) A filter (strainer) for circulating fluid is used, and the filter element has been replaced with new
one. A filter element has been forgotten to be mounted. Filtration rating has been changed.
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