FRIEDHELM LOH Rittal 3273 Series, Руководство по сборке и эксплуатации

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7 Inspection and maintenance
EN
20 Rittal enclosure cooling unit
6.1.10 Resetting the e-Comfort controller
After the occurrence of faults A03, A06 and A07, you will
need to reset the e-Comfort controller.

Press buttons 1 (

) and 3 (

) (fig. 17) simultaneously
for 5 seconds.
The system messages disappear and the temperature
display is shown.
7 Inspection and maintenance
The cooling circuit is designed in the form of a mainte-
nance-free, hermetically sealed system. The cooling unit
is filled with the required quantity of refrigerant at the fac-
tory, checked for leaks, and subjected to a functional
test run.
The installed maintenance-free fans are mounted on ball
bearings, protected against moisture and dust, and fit-
ted with a temperature monitor. The life expectancy is at
least 30,000 operating hours (L10, 40°C). The cooling
unit is thus largely maintenance-free. All that may be re-
quired from time to time is to clean the components of
the external air circuit using a vacuum cleaner or com-
pressed air if they become visibly dirty. Any stubborn,
oily stains may be removed using a non-flammable de-
tergent, such as degreaser.
Maintenance interval: 2,000 operating hours. Depending
on the level of contamination in the ambient air, the
maintenance interval may be reduced to suit the air pol-
lution intensity.
Sequence of maintenance measures:
– Check the level of dirt.
– Filter soiling? Replace the filter if necessary.
– Cooling membranes soiled? Clean if necessary.
– Activate test mode; cooling function OK?
– Check noise generation of compressor and fans.
7.1 Compressed air cleaning
Fig. 21: Disconnect the mains plug
A20 Voltage drop Error display not shown Event is stored in the log file
E0 Display message Connection problem between the dis-
play and the controller board Reset: Switch power supply off, then switch
on again after approx. 2 sec.
Cable defective; connection loose Replace the boards
OL Overload Ambient parameters or heat loss outside the applicable limits
LH Low Heat Minimal heat loss in enclosure.
b07 Leak in the cooling cir-
cuit Sensor B3 and B4 swapped over Swap the sensors
rSt Reset Manual device reset required, see section 6.1.10 "Resetting the e-Comfort controller".
Display
screen System message Possible cause Measures to rectify the fault
Tab. 5: Troubleshooting with the e-Comfort controller
Warning!
The unit is live.
Switch off the power supply before
opening, and take suitable precautions
against it being accidentally switched
back on.
Caution!
Never use flammable liquids for clean-
ing.