External cooling unit (MXCU) control
Unit
Fault code
Category
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of dampers, sen-
sors, air directions, etc.)
xx
yy
z
28
01
1
Module configured in-
correctly. Check CN6
on PCB
●
Check the jumper in the CN6 connector on the cooling control
circuit board. There must be a jumper across 4 and 6, and
across 5 and 6.
28
06
1
Cooling control current-
ly run locally due to
service
Cooling control temporarily controlled by Lodam Multi Tool. Override
lasts for max. 60 minutes
28
07
1
Cooling control safety
functions overridden lo-
cally due to service
Cooling control temporarily controlled by Lodam Multi Tool. Override
lasts for max. 60 minutes
28
13
4
Cooling control detec-
ted but not selected in
VEX configuration
The cooling unit is configured in menu 3.4 "Accessories".
28
14
4
Cooling control config-
ured incorrectly in con-
nection with selected
VEX configuration
●
Check the jumper in the CN6 connector on the cooling control
circuit board. There must be a jumper across 4 and 6, and
across 5 and 6.
28
15
4
No modbus communi-
cation to cooling control
●
Check the modbus cable between the connection board (EX-
act)/main board (EXact2) and MXCU module.
●
Check the modbus cable from the MXCU module to the other
units for faulty wiring.
MCCW
Unit
Fault code
Category
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of dampers, sen-
sors, air directions, etc.)
xx
yy
z
30
01
4
Supply air duct temper-
ature sensor discon-
nected
●
Check the sensor's resistance complies with the actual temper-
ature. See temperature resistance table appendix 2.
●
If the sensor resistance has significantly changed in value, it
should be replaced.
30
02
4
Supply air duct temper-
ature sensor short-
circuited
●
Check the sensor's resistance complies with the actual temper-
ature. See temperature resistance table appendix 2.
●
If the sensor resistance has significantly changed in value, it
should be replaced.
30
05
4
Supply water pipe tem-
perature sensor on wa-
ter cooling coil discon-
nected
●
Check the sensor's resistance complies with the actual temper-
ature. See temperature resistance table appendix 2.
●
If the sensor resistance has significantly changed in value, it
should be replaced.
30
06
4
Supply water pipe tem-
perature sensor on wa-
ter cooling coil short-
circuited
●
Check the sensor's resistance complies with the actual temper-
ature. See temperature resistance table appendix 2.
●
If the sensor resistance has significantly changed in value, it
should be replaced.
3004256-2014-09-10
Alarms
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