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I&O manual
9
Preliminary checks before startup Check for the presence of air in the water system.
Before starting up the unit, make sure that:
the unit is positioned correctly;
the flow and return pipes of the water system are correctly
connected;
the pipes are clean and free of air;
the unit falls correctly towards the drainage outlet and the
trap;
the heat-exchangers are clean;
the electrical connections are correct;
the screws holding the cables are well tightened;
the supply voltage is as required;
the power consumption of the blower is correct and does not
exceed the maximum permitted.
3.2.4 Maintenance
1 remove the casing of the machine (on units I and II );
2 start the system and run for a few minutes;
3 stop the system;
4 slacken the bleed screw on the inlet manifold and
bleed the air.
5 Repeat the operation several times until no more air
comes out of the system.
At the end of the season
Drain the water system (for all heat exchangers).
To avoid the risk of rupture due to freezing, it is
advisable to drain the water from the system at the
end of every season.
Electrical Circuit
The following operations are recommended for the
maintenance of the electrical circuit:
DANGER!
CAUTION
1 check the unit 's power absorption using a clip-on
ammeter and compare the reading with the values
shown on the documentation;
Maintenance work must only be carried out by qualified
technicians authorized to work on air-conditioning and
refrigeration systems. Use suitable work gloves.
Do not introduce pointed objects through the air intake grilles.
Disconnect the power supply before cleaning and maintenance.
Use dry cloth to clean the unit.
Always disconnect the unit from the mains power supply at
the main isolator switch before carrying out maintenance
work or checks. Make sure that no one accidentally supplies
power to the machine, lock the main switch in the Off
position.
SCHEDULED MAINTENANCE
Once a month
Check the state of cleanliness of the air filters.
The air filters are made of fiber and are washable in
water. The state of cleanliness of the filters must be
checked regularly at the start of the operating season and
monthly.
Every six months
Check the state of cleanliness of the heat-exchanger and
the condensation drain-tube. With the unit switched off,
remove the casing of the machine and check the state of
the heat-exchanger and the condensation drain-tube. If
necessary:
2 inspect and, if necessary, tighten the electrical
contacts and terminals.
NON-SCHEDULED MAINTENANCE
Replacement of the blower assembly
In the case of burnout of the blower electric
motor, it is necessary to replace the entire blower
assembly.
Procedure for removal of the blower:
1 Remove the casing (on units I and II)
2 Disconnect the electrical supply cable from the
blower;
3 Remove the screws on both sides which hold the
blower to the structure of the unit;
4 Take out the blower.
1 remove any foreign bodies from the finned surface
which may obstruct air flow;
2 clean off the dust with a jet of compressed air;
wash and brush, gently, with water;
3 dry with a jet of compressed air;
4 check that there are no obstructions in the
condensation drain tube which could prevent the
normal flow of water.
Fig.3-11
5 Procedure for refitting the blower is a reversal of the
above.
11


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