IOM / ROOF-TOP FLEXY™ Series - Page 23
The actual resistance of ductwork systems is not always identical to the calculated theoretical values. To rectify this, it may be
necessary to modify the pulley and belt setting. To this effect, the motors are fitted with variable pulleys.
Measure the absorbed amps
If the absorbed amps are greater than the rated values, the ventilation system has a lower pressure drop than anticipated.
Reduce the flow by reducing the rpm. If the system resistance is significantly lower than design, there is a risk that the motor
will overheat resulting in an emergency cut out.
If the absorbed amps are lower than the rated values, your system has a higher pressure drop than anticipated. Increase the
flow by increasing the rpm. At the same time you will increase the absorbed power which may result in having to increase the
motor size.
To carry out the adjustment and to avoid a time-consuming re-start, stop the machine and if necessary lock the main switch.
First unscrew the 4 Allen screw(s) on the pulley (see figure 23).
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5,0
5,5
8450 /
120
95
116
5
113,9 111,8 109,7 107,6 105,5 103,4 101,3
99,2
97,1
95,0
-
D8450
20,2
28,0
5
21,0
21,8
22,5
23,3
24,1
24,9
25,7
26,4
27,2
28,0
-
8550 /
136
110
131
5
128,9 126,8 124,7 122,6 120,5 118,4 116,3 114,2 112,1 110,0
D8550
20,6
31,2
5
21,6
22,7
23,8
24,8
25,9
26,9
28,0
29,1
30,1
31,2
-
8670
171
145
166
5
163,9 161,8 159,7 157,6 155,5 153,4 151,3 149,2 147,1 145,0
-
D8670
20,5
31,1
5
21,5
22,7
23,8
24,8
25,7
26,9
27,9
29,0
30,0
31,1
-
The easiest way to determine the fan rotation speed is to
use a tachometer. If not available the fan rpm can be
estimated using the following two methods.
1st Method with the pulley secured in place :
L
Measure the distance between the two outside faces of the
pulley.
Using table 1 the motor pulley actual diameter can be
estimated
ALLEN WRENCH 4
AIRFLOW BALANCING
Pulley
type
Pulley
external
Ø
Min Ø
/
Min dist.
Max Ø
/
Max dist.
nr of
turns
from fully
closed to
fully
open
Actual Ø (DM) or distance between faces for a given
number of turns from fully closed with SPA belt in (mm)
Figure 22
Figure 23
Summary of Contents for ROOFTOP FLEXY FCA 100
Page 1: ...INSTALLATION OPERATING MAINTENANCE MANUAL ROOFTOP FLEXY English August 2003 ...
Page 2: ......
Page 33: ...IOM ROOF TOP FLEXY Series Page 31 AIR FLOW BALANCING AT 12 12 FAN ...
Page 34: ...Page 32 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING AT 15 15 FAN ...
Page 35: ...IOM ROOF TOP FLEXY Series Page 33 AIR FLOW BALANCING AT 18 13 ...
Page 36: ...Page 34 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING AT 18 18 FAN ...
Page 37: ...IOM ROOF TOP FLEXY Series Page 35 AIR FLOW BALANCING RDN 450 FAN ...
Page 38: ...Page 36 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING ADN 355 FAN ...
Page 39: ...IOM ROOF TOP FLEXY Series Page 37 AIR FLOW BALANCING ADN 400 FAN ...
Page 40: ...Page 38 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING ADN 450 FAN ...
Page 104: ...Page 102 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS MAIN CURRENT DIAGRAM ...
Page 106: ...Page 104 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS CLIMATIC CONTROLLER ...
Page 108: ...Page 106 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS CLIMATIC INPUT FG FD ...
Page 112: ...Page 110 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS GAS BURNER 180 Kw ...
Page 132: ...Page 130 IOM ROOF TOP FLEXY Series ISO 9001 CERTIFICATION ...
Page 133: ...IOM ROOF TOP FLEXY Series Page 131 PED CERTIFICATION OF CONFORMITY ...
Page 134: ...Page 132 IOM ROOF TOP FLEXY Series GLASS WOOL FIRE CLASS ...
Page 135: ...IOM ROOF TOP FLEXY Series Page 133 33 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 136: ...Page 134 IOM ROOF TOP FLEXY Series 60 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 137: ...IOM ROOF TOP FLEXY Series Page 135 120 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 138: ...Page 136 IOM ROOF TOP FLEXY Series 180 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 139: ...IOM ROOF TOP FLEXY Series Page 137 INSULATION FIRE CLASS ...
Page 140: ...Page 138 IOM ROOF TOP FLEXY Series INSULATION FIRE CLASS ...
Page 141: ......