AGL_Unit_LOCU_EN_Rev00
25
NOTE: The message "Err" is displayed in case of a failed programming operation. In this case
turn the unit off, then on again to restart the download, or remove the "Hot Key" to abort the
operation.
2.19 Troubleshooting
– Alarm history
The controller records the total number of alarm activations (max 50) in the alarm menu
– see
Appendix 2
.
Action
Key or display
Notes
Enter menu
Push and release the
ALR
key.
Waiting f or action
SEC
The menu to change the section will be entered. The
alarm list section is active.
Enter section list
Press
SET
to confirm. The following list will be
available to select the proper network function.
Select active alarm
code from list
or
Scroll the list of active alarms by alarm number (letter
+ number, A01-A50).
Press
to see the alarm name or code.
Press
to see the next active alarm.
Exit menu
Press
simultaneously or wait for about
10 seconds without pressing any key.
Table 19: How to check the alarm list
2.20 Compressor motor protection
The electronic controller protects the compressor motor against the following:
▪
phase loss;
▪
incorrect phase rotation;
▪
voltage imbalance.
2.21 System pressure protection
2.21.1 High-pressure safety switch
A non-adjustable high-pressure switch protects the system against excessive high pressure. The
device will open in the event of an abnormally high discharge pressure (above 28.8 bar).
▪
The unit will stop then restart automatically after a 5-minute delay and after the unit pressure has
decreased to 24 bar.
2.21.2 Low-pressure safety switch
In a way similar to the high-pressure sensor, the electronic controller registers the switching action
of the adjustable low-pressure switch, which will open in the event of an abnormally low suction
pressure.
▪
The unit will stop then restart automatically af ter a 3-minute delay
(D28)
and when the unit
reaches the cut-in pressure level.
The unit is always equipped with a suction pressure transmitter which also takes care f or protection
against vacuum operation. In rare instances of controller breakdown, the low-pressure switch would
allow the unit to run in emergency mode
– see
section 2.15 "Rescue mode (emergency mode)"
.
2.22 Other inputs of the XCM25D controller
2.22.1 Heat recovery mode
The electronic controller provides a digital input (
DI5
) to activate the heat recovery mode. There are
prewired terminals X11.51 & X11.52 available to connect the demand signal. The wiring between the
controller and above-mentioned terminals is f actory-assembled. For more details please refer to
section 2.16 "Heat recovery mode
.
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