PYROSTAR
–
SMOKE FAN F400-120
MS-MTG-001
Ind E
01/10/2019
Page 7/8
IV.3.
IV.3 Variable pulley settings
The variable pulley allows to set airflow.
1 = fixed flange
2 = threaded sleeve
3 = variable flange
4 = pulley locking screw
5 = flange locking screw
The variable flange can move on the threaded sleeve. To move the
flange, first unscrew the flange locking screw, then turn the flange.
Screwing the flange will expend pulley
’
s diameter, ie higher airflow.
Uncrewing the flange will reduce pulley
’
s diameter, ie lower airflow.
After settings, make sure both locking screws are secured and the the
pulleys alignment is fine.
V.
Troubleshooting
Problem
Main reasons
How to solve
Fan not running
Main power off
Thermal motor protection on
Wrong wiring
Broken belt
Turn power on
Check wirings
Check / replace belt (one spare belt
delivered)
Boxfan abnormal vibrations
Dirty impeller
Tool left in casing
Casing not fixed properly
Clean impeller
Check inner casing
Belt short lifetime
Bad belt tension
Pulleys not aligned properly
Check belt
Check pulleys
Wrong airflow
Closed ducts
Dirty filters
Impeller turning the wrong way
Wrong pressure drops calculation
Check duct system
Change filters if any
Reverse two phases on main power
