CYFAN-C EXTRACT FANS
INSTALLATION AND MAINTENANCE
24V fan units must be installed in accordance with these
instructions and IEE Wiring Regulations BS7671
for SELV installations.
For good EMC engineering practice, any sensor
cables or switched live cables should not be placed within 50mm
of other cables or on the same metal cable tray
as other cables.
4
10. 05. 17. Leaflet Number 691500
2.3 Conversion from 230V to 24V cont.
5.
Separate section 2 of the PCB from section 1 by cutting the tabs
in the positions shown. (see fig 4). Replace section 2 of the PCB
into the fan unit.
Fig 4. Separate section 1 of the PCB (Power supply 230V/24V) from
section 2 (Control PCB 24V DC) by cutting the tabs in the positions
shown with the dotted circles.
Fig 5. Section 1 of PCB will be installed into the transformer
enclosure after the 24V wiring has been completed.
2.4 Installation of Transformer Enclosure
(24 Volt units only)
The enclosure containing the transformer is intended to be mounted
out of sight (e.g. in a loft, cupboard, under floorboards etc.).
However, if this is not possible the transformer enclosure should be
mounted as close to the ceiling, or as far from the "splash zone" as
possible (see below for definition of the splash zone).
As can be seen from the table of wiring sizes, it is advisable to place
the enclosure as close to the fan as possible to reduce the costs of
wiring and assist in installation.
‘Splash zone’
The ‘Splash Zone’ can be considered to be an area within a bathroom
or shower room where a person using the bath or shower can
effectively reach.
An arms reach is defined as 0.6 metres from the edge of the bath or
shower up to a height of 2.25 metres.
2.5 Procedure for fitting the Transformer
1. Remove the transformer cover.
2. Position the transformer base enclosure on mounting surface and
route cables through knockouts. Mark the fixing points on the
mounting surface. Secure using suitable fixings (by others).
3. Before fitting section 1 of the PCB into the transformer
enclosure connect wiring as shown in (24V wiring options).
Fit section 1 of the PCB by first slotting the bottom edge
(see fig 6) into the fixing clip inside the base of the transformer
enclosure then press on the transformer and terminal block until
the PCB clicks into place. Complete by replacing the transformer
cover using the screws provided.
4. Keep vents clear of obstruction.
Complete the installation of components by securing the PCB
cover on the fan.
Note: No earth is to be connected between transformer and fan.
Fig 6. Place section 1 of the PCB into the transformer enclosure
supplied with the fan.
2.6 Transformer installation notes for
wiring sizes
It is important to note that the size of wire used between the
transformer and the fan unit can have an adverse effect on the
units performance if the following table is not adhere to.
Mains Supply: (230V)
0.5mm sq.
Transformer to fan (24V units only)
Cable run (max. 10 metres)
Cable size
Up to 2m
0.75 mm sq.
Up to 4m
1.0 mm sq.
Up to 6m
1.5 mm sq.
Up to 10m
2.5 mm sq.
SECTION 2.0
UNIT PREPARATION CONT.
Section 2 (Control PCB 24V DC)
Motor
connection
24V SELV
output
24V SELV
input
Connection
to pull-cord
SL N L
T
Transformer
S
0
2
SL
0
24V
24V
0
SL
Mains supply
terminal block
Section 1
(Power supply
230V to 24V)
Section 1 (Power supply 230V to 24V)
Mains supply
24V SELV
output
SL N L
Transformer
Terminal block
Bottom edge of PCB.
SL
0
24V
Terminal block
Place section 1 of PCB
into the transfomer enclosure
Top fixing clip
Slot for small flat screwdriver to come from
underneath the transformer to push clip to one side
Note to installing electrician: To avoid cable insulation contact with
hot transformer, always use the knockout at PCB end.