Cleaning, Maintenance And Failures - CombiSteel 7480 Serie Mode D'emploi

CLEANING, MAINTENANCE AND FAILURES

The maintenance has to be executed by skilled workers who have the necessary technical qualifications
established by the country where the unit is installed.
Before doing any maintenance or cleaning works, insulate the unit from any source of electric energy or of
waterpower.
To execute the maintenance and assistance operations, it could be necessary to remove the front panel of the
unit condensing side. In accordance with the models, act as follows:

Wall-mounting, Straddle, Split, Bi Block, Condensing Units and Horizontal Units (form 4 and 5): loosen and
take the screws off that fix the front panel (fig. 11-1) (in the Wall-mounting and Bi Block units form 5 remove
the screws only from the right panel), move the lower side (the upper one for the Wall-mounting and Bi
Block units forms 4 and 5) of the panel from the unit for about 20 cm, but the upper side (the lower one for
the Wall-mounting and Bi Block units forms 4 and 5) of the panel has to remain caught in the flange (fig. 11-
2); loosen the fixing of the ground cable that joins the front panel from the unit inside (fig. 11-3), then lift
and remove the panel (fig. 11-4). To restore the beginning conditions, repeat the operations in the opposite
order.

Ceiling and Horizontal units forms 1, 2 and 3: loosen and take the screws off that fix the panel (fig. 11-5),
move the panel from the unit, so that you could enter the unit with an hand (fig. 11-6); loosen the fixing of
the ground cable that joins the front panel from the unit inside (fig. 11-7), then remove the panel (fig. 11-
8). To restore the beginning conditions, repeat the operations in the opposite order.
The maintenance concerns above all the cleaning of the air condenser: this operation has to be executed by
using an air jet from the inside of the unit towards the outside or by cleaning the external side of the
condenser with a long soft bristle brush (fig. 11-9). Normally the condenser has to be cleaned once a week;
if the place where it is installed is very dusty it could be necessary to clean it more frequently, even once a
day.
In case the unit is provided with a water condenser, for its cleaning it is advisable to consult a plumber or a
qualified person for the use of descaling tools and materials necessary for these operations. Normally it is
enough to execute this type of maintenance once a year except for particular problems due to the hydraulic
net; if this happened, you should contact a plumber. The condensed water drains have to be cleaned as well,
and also in this case, among the possible methods, it would be better to use a compressed air jet from the
inside of the unit towards the outside. This operation has normally to be executed once a month; for high
temperature cold rooms in which a very fat product is preserved, it is necessary to check more frequently
the efficiency of the drains, even once a week.
It can happen that, because of an anomaly, a compact ice layer forms on the finned battery of the evaporator.
After having determined the cause and repaired the failure, it is absolutely necessary to remove all the ice
before setting the machine in motion again. In order to do it, it is possible to execute a manual defrost (See
the manual enclosed with the instructions about the electronic instrumentation). In case one defrost is not
enough, wait some minutes and then repeat the operation. If you want to speed up even more the ice
melting, execute the following operations: switch off the unit through the main switch, dismantle the metal
sides and the evaporator fans, melt the ice by using hot water, then install the fans and the sides again and
set the unit in motion.
N.B. In order to remove the ice from the finned battery of the evaporator, you have NEVER to use metal or
sharpened objects.
Put the maintenance rejection material in the suitable storage places, if they are polluting or not biodegradable.
To clean the unit, water jets have NEVER to be used.
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