M23740N6-03 01/10/07
page
30
ROOM AIR TREATMENT COIL
ATTENTION: accidental contact with the fins of the
exchanger may cause small cuts. When performing the
following steps, use protective gloves.
The finned surfaces of the cooling coils and especially the
condensation collection trays are the places where micro-
organisms and moulds most easily flourish. It is therefore
very important to clean regularly with suitable detergents
and disinfect with appropriate products as necessary.
STRUCTURE
Check the condition of the parts making up the structure.
Paint so as to eliminate or reduce oxidation at the points in
the unit where this problem may occur. Check that the
panelling is fastened correctly. Poor fastening may give
rise to malfunctions and abnormal noise and vibration.
DUCTING
Check the fixing screws and the operation of the anti-vibration devices in order to prevent the transmission of vibrations in the
room.
ELECTRIC FANS
Make sure that the fans and the relative protection grids are well fixed.
Check, if possible, the unbalances of the electro-fan evident by noise and anomalous vibrations. Verify that the terminal
protection covers are closed and the cable holders are properly positioned.
FANS WITH BELT DRIVE
BELT
The tension of the belt can be adjusted by the worm screw
on the slide connected to the electric motor, using a socket
wrench or spanner.
The belt is tensioned correctly when the tolerances
defined in the enclosed sketch are respected.
The tension of the belt should be checked after around 10
hours of operation
.
Avoid the following situations:
1. Not sufficient tension, which causes slipping and
overheating and, as a consequence, the reduction of
service life.
2. Too much high tension, which subjects the belt to high
stresses and, as a consequence, the reduction of unit
life and an excessive stress on bearings and
supports.
3. Belt lifted from the groove
4. Belt that reaches the bottom of the groove.
5. Belts of different length (only in the case of coupled
belts).
L
= distance between pulleys
F
= belt profile force SPA 2,8..3,6 Kg
D
= elastic deviation
= L x 0,0015
PULLEYS
Avoid the following situations:
1. Pulleys not aligned.
2. Pulleys not parallel.
3. dirty pulleys; dust, grease, dirt deposited between
the surfaces of the belt and of the pulleys can
make the system operate in anomalous
conditions.
4. Pulleys not straight.
5. Pulleys too small.
6. Pulleys
broken.
7. Pulleys off-centre or unstable.
8. Pulleys
worn.
ELECTRIC MOTOR
The cooling air slits must be always free to let the air pass
.
BEARINGS
Check regularly if unusual noises are presents.
High size fans are equipped with grease nipples where
grease for bearings must be periodically added
.
ANTIVIBRATION RUBBERS
Periodically check the condition to avoid situations of
anomalous vibrations / noise
.
ELECTRICAL HEATING ELEMENTS
The convector finned heating elements need to be checked regularly to ensure that they are clean and properly fastened to the
support.
