HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
3.3 Troubleshooting
HRS Series
3-32
AL05: High circulating fluid return temp.
<Detection method> This alarm goes off when the temperature sensor for the circulating fluid (for fluid
return) detects 60
o
C or more.
Does the alarm
go off when the heat
load fluctuates?
2.
Does the alarm go off
after the Thermo-Chiller
starts?
Y
Y
N
N
Make sure that the circulating fluid
return temperature is 60
o
C or
less.
(e.g. By using a by-pass piping)
1.
Is external load out of the
specification range?.
This system cannot be used.
High circulating fluid return
temp.
AL05
AL23 is being generated.
Y
N
4.
Check the circulating
fluid temperature sensor
(PT2).
5.
Check the circulating fluid
temperature sensor (PT2) after
it is replaced.
Normal
Error
Normal
Error
N
Please contact SMC or distributor.
Y
N
Are other alarms being
generated simultaneously?
Y
Check the troubleshooting that
is corresponding to the alarm
number that is being
generated.
Refer to "AL23: Circulating
fluid return temp. sensor
failure".
3.
Check the external piping.
Error
Remove any causes that
caused the problems.
Is the circulating fluid
discharge temperature higher
than 45
o
C ?
See "AL02: High
circulating fluid discharge
temp.".
Normal
Y
N
Replace the main board.
See section "4.5.16
Replacement of main board
& communication board".
