User manual

8 Inspection and maintenance
EN
32 Rittal enclosure cooling unit
8 Inspection and maintenance
8.1 Safety instructions for maintenance
work
The unit must be opened in order to carry out mainte-
nance work. There is a risk of injury from electric shock.
 Switch off the power supply before carrying out main-
tenance work.
 Secure the power supply to prevent it being switched
back on accidentally.
 Disconnect the electrical connection cable of the cool-
ing unit from the power supply at the connection box.
 Wait at least five minutes before handling the unit. Only
then will the capacitors built into the unit have dis-
charged themselves.
 When handling the enclosure, be aware of any ex-
posed power sources, where applicable.
 If possible, disconnect the entire enclosure from the
power.
There is also a risk of injury from sharp edges, such as
the louvres of the heat exchanger.
 Wear cut-resistant gloves for all maintenance work.
After removing the cover, there is a risk of burn injuries
from hot surfaces on the components inside the unit.
 Before carrying out any work on the interior of the unit,
allow it to cool down for at least ten minutes.
8.2 Notes on the refrigerant circuit
The cooling unit is filled with the amount of refrigerant re-
quired at the factory, checked for leaks, and subjected
to a functional test run. The refrigerant circuit is designed
in the form of a maintenance-free, hermetically sealed
system. For this reason, the operator should not carry
out any maintenance work on the refrigerant circuit.
8.3 Maintenance work on the cooling unit
If there is visible dirt present, the components in the out-
er air circuit should be cleaned using a vacuum cleaner
or compressed air.
 Clean the cooling unit inside and out at least every
5,000-8,000 operating hours as described in section
8.4 "Compressed air cleaning".
 Any stubborn, oily stains may additionally be removed
using a non-flammable detergent, such as degreaser.
The installed maintenance-free fans are mounted on ball
bearings, protected against moisture and dust, and fit-
ted with a temperature monitor.
 Rittal recommends that the cooling unit fans should be
checked e.g. for unusual running noises after around
40,000 operating hours.
8.4 Compressed air cleaning
8.4.1 Dismantling a unit with full internal mount-
ing
Cooling units with full internal mounting in the enclosure
must first be completely removed from the mounting
cut-out before cleaning with compressed air.
 Remove the cooling unit from the rack mount in the re-
verse order as for installation (see section 5.3.7 "Full
internal mounting of the cooling unit")
 Hold the threaded bolts in place with a screwdriver in
order to loosen the nuts.
 Then dismantle the unit as described in section 8.4.2
"Dismantling the unit".
8.4.2 Dismantling the unit
 At the front of the cooling unit, pull the top louvred
grille away from the mounting clips on the cover, and
place or lay it down somewhere safe.
Caution!
Maintenance tasks on the refrigerant
circuit must only be undertaken by a
qualified refrigeration specialist.
Note:
The maintenance intervals given below de-
pend to a large extent on the level of contam-
ination in the ambient air. For heavily
contaminated air, the maintenance intervals
will be reduced accordingly.
Caution!
Never use flammable liquids for cleaning
the unit.
Note:
In principle, the unit is dismantled in the re-
verse order from assembly.