10 Troubleshooting
EN
64
Rittal Liquid Cooling Package
10
Troubleshooting
Malfunction
location
Malfunction
Cause of malfunction
Effect
Remedy
Control valve
The
CMC III PU
displays flow
even though
the control
valve is dis-
played as
closed
The control valve is dirty
The flow meter displays a
value. There is a
Δ
T.
Use the CMC III PU to open
and close the control valve
several times; contami-
nants may be loosened.
It is highly recommended
that a filter be installed in
the system to ensure the re-
quired water quality.
If needed, disconnect pow-
er to the complete Liquid
Cooling Package and re-
start after approx. 1 minute.
Flow meter
The
CMC III PU
displays no
flow even
though the
control valve
is displayed
as open
Flow meter is dirty
The flow meter displays no
value, even though the con-
trol valve is open and there
is a
Δ
T.
The flow meter must be re-
moved and cleaned or re-
placed by authorised
personnel. It is highly rec-
ommended that a filter be
installed in the system to
ensure the required water
quality.
Electronics/
Software
The electron-
ics/software
do not re-
spond
The system is hung up,
e.g. through loose connec-
tion or incorrect operation
No response, display and
control via the CMC III PU
do not work correctly.
Disconnect power to the
complete Liquid Cooling
Package and restart after
approx. 1 minute. Also dis-
connect any existing net-
work connections by
removing the control unit
network connector from the
CMC III PU of the Liquid
Cooling Package.
Liquid
Cooling
Package
The Liquid
Cooling
Package is
not regulat-
ing tempera-
ture and is
operating in
emergency
mode
After a power supply inter-
ruption or upon first instal-
lation, the Liquid Cooling
Package may operate in
emergency mode be-
cause of an alarm, e.g. be-
cause there is no water
pressure.
The 2-way control valve is
open and the fans operate
at full speed.
Press the "C" button on the
Liquid Cooling Package
control unit for approx.
2 seconds. The system will
then enter regulating mode
if all is properly connected
and the unit is supplied with
electricity and cold water.
The unit is
not providing
the required
cooling out-
put
Air in the system
If there is air in the system,
the water cannot circulate
properly in the heat ex-
changer. Thus, it cannot re-
move heat.
Bleeding the air from the
heat exchanger