4. measure the arrow “C” in the middle of the free
section that should be 1.5 mm for every 100mm of
length “D” ( C = 1.5 x D/100);
5. if “C” is less (belt too tight) adjust using screw “A”
(see Fig. 16) bringing the motor closer to the fan, if
“C” is more (belt too slack) use screw “A” to adjust
it by increasing the distance between the motor
and the fan;
6. when force “F” and arrow “C” are as they should
be, replace the protective cover on the drive
system and tighten up all the screws.
If the belt slips for a second or two due to torque, this
is completely normal. Correct belt tension is
important for preventing early wear (slack belt) or
overload
on
the
motor
and
fan
bearings
(belt too tight).
To avoid down time, replace the drive belts at least
once a year before they become overworn.
The job of replacing a belt is very similar to that
described above for adjusting one bearing in mind
that:
1. for replacement, you need to undo screw “A” until
you can completely remove the belts from their
positions;
2. the tension of the new belts must be set using a
force F1 = F x 1,3;
3. after running the appliance for 60-120 minutes,
recheck the tension and set it to the value shown
in table in Fig 15.
Air filter
As the cleaning and replacing of the air filter depends
upon the conditions under which the appliance is
operating, check the filter once a fortnight. Clean or
replace the filter every 60 days.
Warning:
Failing to clean or replace filters has a
significant effect on the efficiency of the system with:
• increased loss of load in the air circulation system
and reduced air flow;
• subsequent drop in system performance and in
comfort levels.
Precautions to take if mothballing the appliance
If the appliance is to be out of operation for a lengthy
period, some simple precautions should be taken:
• Disconnect the appliance from the mains leaving a
note to this effect;
• If the appliance has a filter, remove it and store it in
a sealed container.
• Every 30 days or so, rotate the motor and fan for a
few seconds to prevent any damage to the
bearings.
Summary of scheduled maintenance
15
days
30
days
60
days
90
days
180
days
12
months
Safety systems
- checks and tests
**
Motors, fans,
drive system
- belts, check
- belts, replacement
- bearings, possible
replacement
**
**
**
Air filters
- check
- cleaning and
replacement
**
**
Vents
- check
**
15
15
D
C
F
Drive belt
section
Minimum force F
N(Kg)
Maximum force F
N(Kg)
A
7 (0.7)
10 (1)
B
16 (1.6)
24 (2.4)
C
29 (2.9)
47.5 (4.75)
D
57 (5.7)
86 (8.6)
16
16
SCREW
A
21
ENGLISH
