C6.1.9/0219/E
13
the discharge pipe of the digital compressor. The controller is using the signal from this sensor for
control purposes as well as safety functions.
Adjustable low-pressure alarm:
The unit controller features an adjustable low-pressure alarm
managed by the suction pressure sensor. The factory setting of this alarm is the lowest permitted
pressure of the refrigerant with the lowest pressure-vapour properties. If needed the user can modify
this value as per the required application.
▪
OMTE models:
0.8 bar rel
▪
OLTE models:
0.3 bar rel
Adjustable low-pressure switches PS1:
In case of controller breakdown, the low-pressure switch
is used for emergency operation (prewired rescue mode components). It must be adjusted depending
on running conditions and potential special requirements. The compressor envelopes published in
Select must always be respected. Further information can be found in chapter 2.13 "Rescue mode
(emergency mode)".
In standard operation mode the low-pressure switch will work for both compressors as a protection
device.
The crankcase heater(s)
is connected directly to the controller. The crankcase heater will be
energized when the ambient sensor is below a given value (10°C) and the compressor has been off
for a period of 5 minutes. The minimum off time does not apply at initial power up.
Liquid line assembly:
filter drier and sight glass/moisture indicator.
2.9 XCM25D Electronic controller
– Programming
CAUTION
Low refrigerant charge! Compressor damage!
Never energize the
unit/controller without minimum refrigerant system charge. There is a risk of
malfunction of the controller in deep vacuum operation which can cause
compressor damage.
2.9.1 Programming the local display
Figure 12: Local display
LED
Mode
Function
On
Compressor 1 enabled
Flashing
Anti-short cycle delay enabled
On
Condensing fans enabled
On
Bar display
Flashing
Programming mode
On
PSI display
Flashing
Programming mode
On
When browsing the service menu
Flashing
In fast access menu
On
When browsing the alarm menu
Flashing
A new alarm occurred
On
An alarm is occurring