HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
3.3 Troubleshooting
HRS Series
3-76
AL16: Refrigerant circuit pressure (low pressure side) rise
<Detection method> This alarm goes off when the pressure detected by the refrigerant circuit pressure
sensor (for low pressure) is 0.8 MPa (Option G: 0.85 MPa) or more.
2.
Check the pressure
sensor used in the refrigerant
circuit.
1.
Check the surrounding
environment.
Normal
Error
6.
Check the analogue
output of the pressure sensor
(for low pressure)
refrigerant circuit.
5.
Check the display of the
pressure sensor (for low pressure)
used in the refrigerant
circuit.
Error
Error
Normal
Error
4.
Check for an input to
the pressure sensor used
in the refrigerant
circuit.
Normal
Normal
Are other alarms being
generated simultaneously?
Y
N
Check the troubleshooting
that is corresponding to the
alarm number that is being
generated.
Improve the installation
environment.
Y
N
3.
After stopping the power
supply, does the same alarm go off
again when the chiller is
restarted?
Please contact SMC or
distributor.
N
Y
Refrigerant circuit pressure
(low pressure side) rise
AL16
Replace the main board.
See section "4.5.16
Replacement of main board
& communication board".
See document No. HRX-MM-
S029 for replacement.
Refrigerant circuit pressure
sensor (for low pressure), which
is a part of the refrigerant circuit,
needs to be replaced. Only a
specialized operator is allowed
to handle the refrigerant circuit.
Electronic expansion valve,
which is a part of the
refrigerant circuit, needs to
be replaced. Only a
specialized operator is
allowed to handle the
refrigerant circuit.
See document No. HRX-MM-
Q016 for replacement.
