4
Version 22.02.2002 © Fläkt W
oods Oy
Roofmaster STEF and STOF
Fig. 3
Fig. 4
Electrical wiring
(To be carried out by an authorised electrician.) The
wiring diagrams are on page 5 The wiring diagrams for
the speed controllers (STYR), are included in the supply.
A. Power roof ventilator with SAFE safety isolating
switch, Figure 3.
If the STEF power roof ventilator has been equipped
with a factory-fitted SAFE safety isolating switch, the
electrical wiring between the motor and safety isolating
switch has already been done at the factory. The safety
isolating switch has been mounted in a recess in the
side of the ventilator casing. Only the front section of the
switch is exposed.
1. Open the safety isolating switch protective cover.
2. Open safety isolating switch cover.
3. Run the flexible power supply cable through the
cable seal at the lower edge of the ventilator casing
to the safety isolating switch. Adjust the length
of the electric cable so that sufficient slack will be
available for raising the fan for servicing.
4. Wire the connections, close the safety isolating
switch and the cover.
5. Check to make sure that the switch functions
correctly.
NB. In case of spark-proof version, the safety
isolation switch shall not be mounted in the fan
casing. If the spark-proof roof ran is ordered with
safety isolation switch, it is mounted externally
on the fan casing.
B. Power roof ventilator with a safety isolating switch,
which is to be fitted at the building site.
If the power roof ventilator has not been equipped with a
factory-fitted safety isolating switch, fig. 4, the safety
isolating switch can be mounted at an optional location,
for example in the side of the roof duct or in the side of
the power roof ventilator.
1. Mount the safety isolating switch at the desired
location.
2. Wire the connections inside the safety isolating
switch.
3. Open the connection cover on the side of the power
roof ventilator. To facilitate the electric connection
open the roof of the power roof ventilator and pull up
the insulated cover plates of the motor.
4. Open the junction box on the electric motor.
5. Run the flexible power supply cable through the
cable seal at the lower edge of the ventilator casing
to the connection opening and then to the motor.
Adjust the length of the electric cable so that sufficient
slack will be available for raising the fan for servicing.
6. Make the electrical connections to the motor.
7. Mount the panels and the top grille.
8. Close the junction box in the switch and make sure
that the safety isolating switch functions correctly.
Electrical wiring
Cable gland
Cable gland