SDF 100 Low Voltage Axial Fans
These axial fans are designed for use within bath/shower areas. They are fitted with long life 12V AC
motors. The low voltage supply is from a 230V AC~/-12V AC - Transformer assembly constructed
to BS 3535.
INSTALLATION INFORMATION
WARNING : Isolate electricity supply before commencing work
POSITIONING THE FAN UNIT
The fan may be positioned on a wall, ceiling or window. The fan should be sited as high as possible in the room. If fitting
in a shower cubicle or over a bath with a shower it must be positioned above the shower head. Model SDF100HTBLV
must be positioned in a splash free area as the humidity sensor will be damaged if in direct contact with water. To
ensure efficient ventilation it is advisable that the fan unit be fitted as far from the main source of replacement air as
possible (e.g. the door). We advise that there be a 15mm gap under the door to allow replacement air to enter the
room if no other means is provided.
POSITIONING THE TRANSFORMER
The transformer must not be positioned within 1.5metres of a bath or shower. The wiring length between the fan and
transformer should be kept as short as possible (should not exceed 9 metres). The transformer should be positioned as
high on the wall or ceiling as possible if in the same room as the fan. It is normal for the transformer to get warm when
operating, therefore, it is important that air is allowed to circulate around it. The transformer should not be installed
in small enclosed spaces. Access must be allowed for servicing and timer adjustment. If installing transformer in roof
space it must not be covered with insulation material.
DUCTING
Wherever possible ducting should be of rigid type, flexible duct should only be used for connections. To ensure
efficiency keep all ducting runs as short as possible. If ducting is installed in a roof space it should be lagged to reduce
condensation within the duct. Horizontal duct should run downwards towards the outside to allow for condensation
drainage. Vertical discharge ducting should be fitted with a condensation trap. The SDF100LV fan unit uses 100mm
duct. Total duct length should not exceed 2 metres. We recommend a fixed louvre grille be used with these fans (ANC
410/435/436D). Non-return grille may be used but will reduce the fan performance.
WIRING INSTALLATION
WARNING : Isolate Power Supply before commencing work
WIRING REQUIREMENTS FOR DOMESTIC ELECTRIC FANS
It is recommended that the fans be connected into the lighting circuit, with double pole (3mm) isolation
provided before the room light switch and suitably fused, in accordance with IEE Regulations.
Window Fans should be connected to power supply using a flexible cord with conductors of between
0.75 and 1.5mm
2
only.
Wall and ceiling mounted fans for fixed wiring should be connected to the power supply via a cable
with solid conductors of 1mm
2
to 1.5mm
2
only.
WIRING INSTRUCTIONS
WARNING : Isolate Power Supply before commencing work
MAXIMUM ROOM TEMPERATURE 40ºC
FITTING WALL FAN
1.
Select a suitable position on the
wall for the fan in relation to outside
walls, ceilings and roofs keeping
the ducting as short as possible -
see ducting.
2.
Cut a hole in the wall or ceiling to
take the rear spigot of fan plus
ducting if fitted. Drill and plug the
fixing holes.
3.
Remove the screw from the front
fan casing and take it off.
4.
Fasten the fan back plate to the
surface. Make sure that the fan is
the right way up.
DUCTING
1.
Bring the ducting to the chosen
locations and trim its ends flush
to the surfaces.
2.
Note that there are 3 basic
types of installation and that
condensation drainage should
be provided as shown. Ceiling
location makes drainage
provision essential.
3.
A small condensation trap should
be made at the lowest point
of the ducting. As shown it is
advisable to lag duct.
CONDENSATION
TRAP
FAN
FAN
WALL
GRILLE
FALL TO
OUITSIDE
CONDENSATION
TRAP
FAN
FAN
WALL
GRILLE
FALL TO
OUITSIDE
SDF 100LV PRODUCT CODES
Wall/Ceiling Model - Standard
Wall/Ceiling Model with adjustable Timer
Wall/Ceiling Model with Humidistat and Timer
NOTE:
TO CONVERT AND INSTALL THE ABOVE MODELS AS WINDOW FANS, WINDOW
FIXING KIT SDF901WFK WILL BE REQUIRED.
SDF100BLV
SDF100TBLV
SDF100HTBLV
TRANSFORMER INSTALLATION
1. Remove front cover retaining screws.
2. If using rear entry cabling remove knock-outs.
3. If using surface cabling cut suitable hole in sealing grommits.
4. Using the transformer base as a template, mark fixing hole and
cable entry positions.
5. Once cabling and resurfacing is complete drill and plug fixing
holes.
6. Fit the transformer into position and make power connections
as detailed.
7. Re-fit front cover.
IF IN DOUBT, PLEASE CONSULT A QUALIFIED ELECTRICIAN
SDF 100HTBLV - HUMIDISTAT MODEL
SDF 100TBLV - TIMER MODEL
SDF 100BLV - STANDARD MODEL
