27
FAN SPEED SET-UP
The equipment is supplied as standard with the transmission
ratio adjusted in such a way that the nominal air flow can be
obtained with plenum diffusion through three or four of its
sides and with air intake from one or two sides through the
intake grills
.
WARNING!
Air diffusion from one side only of the plenum is not allowed
.
For any usage other then the above mentioned normal working, involving the diffusion of channelled air, the insertion of
filter and so on, i.e. any arrangement which cause variations in the air resistance, it is essential to carry out a check on
the air flow and regulate it, if necessary, so that it is at the nominal levels
.
This check can be carried out with precise instruments or for
a good rough approximation, by checking the thermal jump
between the air delivery and air intake when the burner is set
at its nominal thermal capacity. The result should be
checked
against the data indicated in the paragraph TECHNICAL
DATA
.
It is in any case necessary to check that the direction of rotation of the fans is the same as that of the arrow on the screw
.
To alter the direction of rotation, in the case of a three phase
electric motor, just invert one phase of the supply line
without
interfering with the electrical panel. It is also necessary to
check that the motor output does not exceed that
indicated
on the plate; if necessary change the fan rpm to obtain this
result
.
To change the fan rpm proceed as follows
:
TYP 1
4
Loosen screws
2
to slacken the belts;
Remove belt
1
;
Slacken the dowels
4
of the moving part of the pulley
3
with a hexagonal wrench
5
;
Turn the mobile part of the pulley so as to obtain the desired pitch line diameter
;
Tighten the dowels hard
4
at the hollow in the boss;
Mount and tighten the belt
1
.
Typ 5
10
Loosen screw
1
to slacken the belts;
Remove belt
5
;
Slacken the dowels
3
of the moving part of the pulley
4
with a hexagonal wrench
2
;
Turn the mobile part of the pulley so as to obtain the desired pitch line diameter;
Tighten the dowels hard
3
at the hollow in the boss;
Mount and tighten the belt
5
.
WARNING!
Never stretch the belts too tight as the fan shaft could
break. Hand pressure on the belt should be able to
move it
by 20-30 mm
.
Increasing the pitch line diameter of the pulley motor
increases the fan rpm and the motor’s electrical
absorption.
Reducing the pitch line diameter of the
pulley motor increases the fan rpm and the motor’s
electrical absorption
.
The equipments
typ 11
15
are provided with a fixed gearing transmission and to change the rpm of the fan the
exchange of a poulley is needed.
Typ 1
4
Typ 5
10
All Parts available from
www.sparesgiant.com
01772 329 565
