Vent-Axia Centrif Duo Series Assembly instructions

PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS. PLEASE SAVE THESE
INSTRUCTIONS.
IPX4
220-240V~50Hz
Stock Ref. N°
Centrif Duo P 25 61 20C
Centrif Duo T 25 62 20C
Centrif Duo DP 25 63 20C
Centrif Duo HTP 25 64 20C
Centrif Duo Plus P 43 16 13A
Centrif Duo Plus T 43 16 14A
Centrif Duo Plus DP 43 16 15A
Centrif Duo Plus HTP 43 16 16A
Centrif Duo &
Centrif Duo Plus
Installation and Wiring Instructions
Centrif Duo Plus
Centrif Duo

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Centrif Duo and Centrif Duo Plus
Features P T DP HTP
Surface mountable ●●●●
Flush mountable with accessory kit (available
separately) ●●●●
Washable filter (available separately for
Centrif Duo Plus) ●●●●
Pullcord ●●●
Trickle speed ●●
LS connection (to boost from a remote switch
from off [T, DP & HTP] or trickle speed [DP &
HTP only]).
●●●
Two boost speed options available (selectable
during installation) ●●●●
Adjustable timer overrun (1-30 mins approx) ●●
Adjustable humidity sensor (default 60%RH
approx) ●

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Installation and wiring instructions for the Centrif Duo and Centrif Duo Plus extract fans.
IMPORTANT:
READ THESE INSTRUCTIONS
BEFORE COMMENCING THE
INSTALLATION
DO NOT install this product in areas where the following may be present or occur:
•Excessive oil or a grease laden atmosphere.
•Corrosive or flammable gases, liquids or vapours.
• Ambient temperatures higher than 40°C or less than –5°C.
• Possible obstructions which would hinder the access or removal of the fan.
SAFETY AND GUIDANCE NOTES
A. All wiring to be in accordance with the current I.E.E. Regulations, or the appropriate standards
of your country and MUST be installed by a suitably qualified person.
B. The fan should be provided with a local isolator switch capable of disconnecting all poles,
having a contact separation of at least 3mm.
C. Ensure that the mains supply (voltage, frequency, and phase) complies with the rating label.
D. The fan should only be used in conjunction with the appropriate Vent-Axia products.
E. It is recommended that the connection to the fan connector terminals is made with flexible
cable.
F. When the fan is used to remove air from a room containing a fuel-burning appliance, ensure
that the air replacement is adequate for both the fan and the fuel-burning appliance.
G. Precautions must be taken to avoid the backflow of gases into the room from the open flue of
gas or other fuel burning appliances
H. The fan should not be used where it is liable to be subject to direct water spray for prolonged
periods of time.
I. Where ducted fans are used to handle moisture-laden air, a condensation trap should be
fitted. Horizontal ducts should be arranged to slope slightly downwards away from the fan.
J. This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance by a person responsible for
their safety.
K. Children should be supervised to ensure that they do not play with the appliance.
DESCRIPTION
As standard, the Centrif Duo and Centrif Duo Plus are suitable for panel/wall installations, surface
mounting, either in a horizontal or vertical plane. A Flush Mount Kit (439256) is available as an
accessory. Ø100mm ducting (flexible or rigid) can be attached providing rear exit as standard or
side exit with the Flush Mount Kit. Adaptors for rectangular ducting can be used. For wall
installations a Wall Kit (25 41 02 White / 25 41 00 Brown) can be used. Please see our catalogue
or web site (www.vent-axia.com) for more information on ducting and termination options.
A. INSTALLATION
A Backdraught Shutter Assembly is supplied. It is packed inside the product during transport. It is
designed to block the duct when the fan is off in order to prevent cold draughts from outside
entering the building. To use it, push it on to the end of the exhaust Spigot (fig.1) with the hinges
on the flaps vertical. It is not required when the fan is set up to run continuously.

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SURFACE MOUNTING (PANEL/CEILING)
1. Remove the Front Cover Assembly by slackening the two screws by two turns (fig.2.) Lift the
front assembly away from the bottom edge first, then the top edge.
2. Cut a ∅105mm hole, then suitable screw holes in the panel, ensuring that there is sufficient
space for the product to be installed and that the filter (sold separately for the Centrif Duo
Plus) can be removed for maintenance. Either the cardboard fitment or the fan chassis can
be used as a template. The Spigot can be removed temporarily to make it easier. (Fig 1 & 3).
3. Set-up the appropriate speed selection and other features as outlined in Section B SETUP.
4. Remove the small Terminal Block Cover in the top right corner (fig 3).
5. Attach the ducting to the Spigot and locate the fan into the hole in the panel. Feed the wiring
through the hole in the Chassis next to the Terminal Block as you do so. (fig. 4)
6. Secure into position using appropriate fixtures.
7. Select and follow the appropriate wiring diagram in Section C WIRING.
8. Replace the little Terminal Block Cover over the Terminal Block (fig.4).
9. Ensure the Impeller rotates freely (fig.3).
10. Replace the Front Cover Assembly and tighten the two screws (fig.2.).
11. Make sure that all covers are on correctly to ensure the optimum performance and water
ingress protection of the fan.
12. Switch the mains power supply on and check the fan is operating correctly.
SURFACE MOUNTING (WALL)
For through-the-wall installations, a Wall Kit (25 41 02 White / 25 41 00 Brown) can be used.
1. Remove the Front Cover Assembly by slackening the two screws by two turns (fig.2.) Lift the
Front Cover Assembly away from the bottom edge first, then the top edge.
2. Cut a ∅115mm hole through the wall, ensuring that there is sufficient space for the product to
be installed and that the Filter (fig.3) can be removed for maintenance.
3. Insert the wall sleeve with the larger diameter sleeve on the room-side and cement the ends
into position flush with the wall faces. The wall sleeve should be angled downwards, away
from the fan, to allow any condensation to drain to the outside.
4. Outside Grille: Using the Grille’s back plate as a template, mark the fixing hole centres on the
wall. Drill and plug the wall and fix the Grille into position. Ensure the louvres are pointing
downwards.
5. Set-up the appropriate speed selection and other features as outlined in Section B SETUP.
6. Remove the little Terminal Block Cover in the top right corner (fig 3).
7. Using the fan chassis as a template, carefully sliding the Spigot into the Wall Liner, mark the
fixing hole centres on the wall. Alternatively, the cardboard fitment can be used as a
template.
8. Drill and plug the wall using the fixings provided.
9. Feed the wiring through the hole near the Terminal Block and secure the fan into position
using the screws provided.
10. Select and follow the appropriate wiring diagram in Section C WIRING.
11. Replace the Terminal Block Cover (fig.4).
12. Ensure the Impeller (fig.3) rotates freely.
13. Replace the Front Cover Assembly and tighten the two screws (fig.2).
14. Make sure that all covers are on correctly to ensure the optimum performance and water
ingress protection of the fan.
15. Switch the mains power supply on and check the fan is operating correctly.
FLUSH MOUNTING (PANEL/CEILING)
A Flush Mount Kit (439256) is required.
1. Remove the Front Cover Assembly by slackening two screws by two turns (fig.2). Lift the
front assembly slowly from the bottom edge first, then the top edge.
2. Mark and cut a rectangular hole 222mm (w) x 253mm (h) through the panel ensuring that
there is sufficient space for the product to be installed and that the Filter (fig.3) can be

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removed for maintenance. IMPORTANT: Be careful to avoid joists and hidden pipes or
cables.
3. Remove the Back Box pieces by removing the four screws (fig 5). Replace it with the Frame
from the Flush Mount Kit.
4. Pass each of the long Panel Clip Screws (fig.6) supplied in the kit fully through the flange of
the Chassis and screw in to the four Panel Clips allowing enough space between the clip and
the flange for the thickness of the panel (so that the clips can spring open behind the panel).
5. Set-up the appropriate speed selection and other features as outlined in Section B SETUP.
6. Remove the Terminal Block Cover in the top right corner (fig 3).
7. Attach the ducting to the Spigot and locate the fan into the hole in the panel, ensuring the
cable is fed into the fan Chassis and the Panel Clips spring out behind the panel.
8. Secure into position by carefully tightening the four Panel Clip Screws. IMPORTANT: If
power tools are used, set them to the minimum torque setting or preferably use a
manual screwdriver. Do not over tighten.
9. Select and follow the appropriate wiring diagram in Section C WIRING.
10. Replace the Terminal Block Cover.
11. Ensure the Impeller rotates freely (fig.3).
12. Replace the Front Cover Assembly and tighten the two screws (fig.2).
13. Make sure that all covers are on correctly to ensure the optimum performance and water
ingress protection of the fan.
14. Switch the mains power supply on and check the fan is operating correctly.
B. SETUP WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING INSTALLATION OR
MAINTENANCE.
1. OPERATION
i. As standard, the HTP models will run continuously at trickle speed until either the
pullcord, LS or humidistat call for boost speed. To disable the constant trickle option,
remove the cover over the PCB to the right of the impeller, and remove the link wire
between terminals 4 and 5 on the PCB (fig.7).
ii. The pullcord on the DP models will cycle between off, trickle and boost. The LS will switch
between boost and the previous state selected by the pullcord (either off, trickle or boost).
If you want to just use the LS to switch the DP model between trickle and boost, first set
the fan running to trickle speed with the pull cord, then remove the pull cord string.
iii. NOTE: P and T models do not have a trickle speed. These models can only switch from
off to the boost speed selected during setup (see 2. SELECTING THE BOOST SPEED).
iv. To set the P model to run at boost speed constantly, (whenever power is connected to the
fan), set the pull cord to the on position and cut or remove the string. You will need to
replace the cover and turn the fan on to determine which is the on position of the pullcord.
v. To set the T model to run at one of the boost speeds constantly, (whenever power is
connected to the fan), link the L & LS terminals of the mains terminal block together (fig.4).
2. SELECTING THE BOOST SPEED. (See Technical Specifications on page 2).
This will determine the speed at which the fan will run when activated by either the pullcord, LS,
or relative humidity sensor depending on the fan model. The speed is factory set to kitchen.
For the T, HTP and DP models (NOT the P model):
i. Link terminals 1 and 3 for Utility boost speed.
ii. Or link terminals 2 and 3 for Kitchen boost speed.
IMPORTANT: Do not link across terminals 1 and 2.

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For the P models only:
iii. Link terminals 1 and 3 for Utility boost speed.
iv. Link terminals 1 and 4 for Kitchen boost speed.
IMPORTANT: Do not link across terminals 1 and 2.
3. TIMER ADJUSTMENT (T and HTP models only)
The overrun time period is factory set to about 15 minutes. The overrun time period may
be adjusted from about 1-30 minutes by altering the upper adjuster of the two on the
control PCB (fig.4 & 7).
i. To REDUCE the operating time, turn the timer adjuster ANTI-CLOCKWISE.
ii. To INCREASE the operating time, turn the timer adjuster CLOCKWISE.
4. RELATIVE HUMIDITY ADJUSTMENT (HTP model only)
The fan’s relative humidity (RH) set-point is factory set to switch the fan on at about
60%RH. This set point can be raised or lowered by altering the lower adjuster of the two
on the PCB (fig.4 & 7).
i. To LOWER the set-point, turn the humidity adjuster (fig.4 & 7 ) ANTI-CLOCKWISE. This
makes the fan more sensitive to RH, i.e. the fan will come on at a lower RH.
ii. To RAISE the set-point, turn the humidity adjuster (fig.4 & 7) CLOCKWISE. This makes
the fan less sensitive to RH, i.e. the fan will come on at a higher RH.
The fan will continue to run at boost after the RH has dropped below the set point for the
time period set by the timer adjustment (see 3. TIMER ADJUSTMENT, above)
C. WIRING.
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING INSTALLATION OR
MAINTENANCE.
Use 0.75mm2cable
1. Select and follow the appropriate wiring diagram (fig. 9 or 10).
2. Use the Cable Clamp provided (fig.4).
3. Check all connections have been made correctly and ensure all terminal connections are
securely fastened.
D. SERVICING AND MAINTENANCE.
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING SERVICING AND
MAINTENANCE.
1. At intervals appropriate to the installation, the fan should be inspected and cleaned to ensure
there is no build up of dirt or other deposits.
2. If fitted, remove the Filter (fig.2 & 3) and wash it and the front cover assembly in warm soapy
water. Dry them before replacing.
3. Wipe the inlets and front face with a damp (not dripping wet) cloth until clean.
4. Replace the filter.
5. Turn the power to the fan back on.

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The fan has sealed for life bearings, which do not require lubrication.
Fig.1.
Backdraught shutter assembly.
Flaps vertical.
Spigot.
Fig.2.
Centrif Duo Plus
Centrif Duo
Cover Assembly.
Cover Screws.
Retaining edge for optional
filter (Centrif Duo Plus only).
Insert flat bladed screwdriver
in here and pull Filter out to
remove it.

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Centrif Duo Plus shown
Fig.3.
Terminal Block Cover.
Spigot.
Cover Assembly.
Chassis Assembly.
Impeller.
Centrif Duo Plus Optional Filter.
(The Centrif Duo models have a
metal mesh filter clipped on to the
rear of the cover. It can be removed
easily and washed too.)
Fig.4.
Terminal Block Cover.
Cable Clamp.
Terminal Block.
Timer Adjustment (T and HTP
models only). Turn clockwise to
increase overrun timer length.
Humidity Adjustment (HTP models
only). Turn clockwise to raise set
point (decrease sensitivity).

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Fig.5.
Frame from optional Flush Mount Kit.
4 screws
Back Box.
Fig.6.
Panel Clip Screw (4 off).
Panel Clip (4 off).
Chassis.

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Terminals
Å1
Å2
Å3
Å4
Å5
See page 5
Section B.
Set Up.
Timer adjustment
Humidity adjustment
Fig 7. Setup
HTP model shown.
PCBs ma
y
var
y
in look.

11
Fig 8. Siting of the fan.
3
2

12
Fig 9. Wiring diagram without LS connection.
Fig 10. Wiring diagram with LS connection.
Other accessories, like pullcords, PIR sensors or humidistats, can be fitted in line with the mains
live connection (L) in order to turn the fan or off.
For details of the warranty and returns procedure please refer to www.vent-axia.com or write to
Vent-Axia Ltd, Fleming Way, Crawley, RH10 9YX
abc
Head Office: Fleming Way, Crawley, West Sussex, RH10 9YX.
Tel: [phone] Fax: [phone]
UK NATIONAL CALL CENTRE, Newton Road, Crawley, West Sussex, RH10 9JA
SALES ENQUIRIES: Tel: [phone] Fax: [phone]
TECHNICAL SUPPORT: Tel: [phone] Fax: [phone]
441678 F 0909
N
L
Ls
1 Phase Supply
(220-240V 50 Hz)
3A
Fuse
Pull Cord
Lamp
3 Pole Isolator
Switch
Ceiling Junction
Pull Cord
(if applicable)
Fan
~
N
LL
N
1 Phase Supply
(220-240V 50 Hz) 3A Fuse
2 Pole Isolator
Switch
Pull Cord
(if applicable)
Fan