26
8 - MAINTENANCE
1. Correct alignment
2. Incorrect alignment
(1)
(2)
8.17 FANS
In accordance with the safety standards in force, before
working on the motor-fan assembly, check that the main
switch is off.
After the first operating period (two days) check the tension of
the transmission belts, restoring initial tension as follows:
Use a normal spanner on the belt tightening slide worm
screw. For motors fitted to the fan shroud, use the span-
ner on the tightening screw.
The tension of the belts is ideal when they allow flexion of
around two centimetres half way between the pulleys.
Excessive belt tension will damage the bearings.
Check that the motor and fan axes are parallel and that
the pulleys are still aligned.
The fans featuring supports with open-type bearings require
periodical lubrication (around every 6 months), whereas the
sealed self-lubricating supports do not require maintenance for
a maximum of 20,000 operating hours.
The deterioration of the bearings is signalled by an increase in
noise and the overheating of the bearings, with the release of
liquid grease.
8.18 PULLEYS
The transmission pulleys are fitted to the shafts using conical
locking bushes that allow easy replacement.
DISMANTLING
Completely unscrew the locking screws, and fully tighten one
of them in the removal opening until the pulley is released.
ASSEMBLY
Carefully clean the conical bore of the pulley. Place the pulley
on the bush, ensuring that the corresponding fastening holes
are aligned.
Oil the thread and under the head of the screws.
Place the screws in position and then fully tighten them,
uniformly and alternately.
B1 = Fixation screw (NORMAL)
B2 = Fixation screws (REVERSIBLE)
E = Removal holes
Refer to the maintenance manual provided by the
manufacturer of the humidifier.
check the water filter
cleaning and check the cylinder every 90 days
replace cylinder if is too dirty
8.20 Heater humidifier
8.19 ELECTRIC MOTOR - BEARINGS
Check regularly if unusual noises are presents.
High size fans are equipped with grease nipples where grease
for bearings must be periodically added
.