Vent-Axia Centra Lo-Carbon SELV Series Assembly instructions

CONTINUOUS EXTRACT FAN
Installation and Wiring Instructions
Stock Ref. N°
443175A - Timer (T)
443176A - Humidistat-Timer (HT)
443177A – Humidistat – Timer -
Pullcord. (HTP)
447128A – Timer-Pullcord (TP)
PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH ILLUSTRATIONS.
PLEASE SAVE THESE INSTRUCTIONS.
Centra
Lo-Carbon SELV
IPX7
FAN UNITS 12V DC SELV (CLASS III)
CONTROLLERS 220-240V 50Hz MAINS SUPPLY (CLASS II)
WITH 12V DC SELV OUTPUT

2

3
Installation and Wiring Instructions for the Centra Lo-Carbon SELV Range of
Extractor 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. The fan should only be used in conjunction with fixed wiring.
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. The Fan should not be used where it is liable to be subject to direct water spray for
prolonged periods of time.
H. 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.
I. 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.
J. Young children should be supervised to ensure that they do not play with the appliance.
K. The exterior grille should be at least 2.3m above the ground to prevent people from being
able to access moving parts. If the external grille is positioned between 0-2.3m from the
ground, Please use the Vent-Axia wall kit as detailed below to ensure people cannot
access the fans impeller from the outside.
IMPORTANT:- ONLY CONNECT TOGETHER PRODUCTS FROM THE CENTRA LO-
CARBON SELV RANGE SINCE THE FANS ARE SPECIALLY DESIGNED TO WORK
ON 12V DC AND ARE NOT COMPATIBLE WITH OTHER VENT-AXIA
CONTROLLERS. DO NOT CONNECT MORE THAN ONE FAN TO THE
CONTROLLER.
DESCRIPTION
The Centra Lo-Carbon SELV 100mm fan is a continuously running extract fan for
kitchens, utility rooms, bathrooms and toilets.
Long life ball bearing DC motor with anti-vibration mounts provides low noise
transmission into plasterboard/panels for silent operation.
The fan can be wall, window or panel/ceiling mounted.

4
ACCESSORIES (not supplied)
WALL FITTING KIT
A range of white (stock ref. 254102) or brown (stock ref. 254100) 100mm wall kits are
available for installing into most walls using telescopic liners supplied.
WINDOW FITTING KIT
A window fitting kit is available (stock ref. 442947).
6” TO 4” ADAPTER PLATE
An adapter to cover up an existing 150mm (6”) installation (stock ref. 443334)
A. INSTALLATION
IMPORTANT: The fan should only be used in conjunction with fixed wiring.
SITING THE CONTROLLER
1. The controller must not be installed in a shower cubicle or enclosure. It must be
sited away from direct sources of water spray and out of reach (1.5m) of a person
using a fixed bath or shower.
2. Site away from direct sources of heat. Ambient temperature range 0 to 40ºC. Do
not site in an area containing excessive levels of grease.
3. Decide where to site the controller and fan (see section siting the fan), and work
out the required cable runs.
SITING THE FAN
1. The electrical supply to this fan is 12V DC SELV from the mains controller. This
means that the fan may be installed within reach of a person using a fixed bath or
shower, i.e. in a nearby wall. However, the fan must not be placed where it could
be submerged in water or regularly exposed to direct water spray, e.g. from a
shower head whether permanently fixed or movable.
2. Site away from direct sources of heat. Ambient temperature range 0 to 40ºC. Do
not site in an area containing excessive levels of grease.
3. If the fan is installed in a room containing a fuel burning appliance the installer
must ensure that air replacement is adequate for both the fan and the fuel burning
appliance. If the fan is used to supply air into the room the installer must ensure
that the fan intake is located at least 600mm Away from any flue outlet.
4. Ducted Applications. These fans can be used with short lengths of ducting, but
check details first with your Vent-Axia sales centre. Where an excessive amount
of moisture is present in the air, a condensation trap will need to be installed in the
exhaust duct. Horizontal ducts should slope away from the fan unit. Ducts passing
through an unheated roof void should be insulated.
5. A short circuit of the airflow should always be avoided by siting the fan as far away
as possible from and opposite to the main source of air replacement. FIG.1

5
PANEL/CEILING MOUNTING
1. For panel/ceiling mounting the fan should be installed into a closed duct system of at
least 1.2m long or protected by an exterior air grille that must comply with the standard
requirements of your country to prevent access to the fans impeller.
2. Cut a 105mm diameter hole.
3. Loosen the screw at the bottom of the grille and remove the front grille. Mark the screw
centres through the holes in the fan back plate. Drill, plug and screw into position.
4. Attach ducting as required for the installation.
5. Wire the fan as described in Section B-Wiring. Adjust any settings as required (see
Section C-Setup).
6. Replace the grille and tighten the retaining screw.
7. After installation, ensure impeller rotates freely.
WALL MOUNTING
1. For wall mounting cut a 117mm diameter hole through the wall and insert the wall sleeve.
Slope the sleeve slightly downwards away from the fan. Cut to length and cement both
ends into position flush with the wall faces.
2. Loosen the screw in the bottom of the grille and remove the front grille. Mark the screw
centres through the holes in the fan back plate. Drill, plug and screw into position.
3. Fix exterior grille into position with the louvres positioned downwards. (Note:- The grille
must comply with the standard requirements of your country to prevent access to the
fans impeller).
4. Wire the fan as described in Section B-Wiring. Adjust any settings as required (see
Section C-Setup).
5. Replace the grille and tighten the retaining screw.
6. After installation, ensure impeller rotates freely.
WINDOW MOUNTING
1. Refer to window kit instructions supplied with the kit.
B. WIRING.
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING THE INSTALLATION / OR
MAINTENANCE.
IMPORTANT
The Controller MUST be surface mounted to allow air to freely circulate around
the unit. When installed in a loft void it MUST NOT be enclosed or covered with
insulation.
The fan should only be used in conjunction with fixed wiring.
The cross - sectional area of supply cord used should be ranged from 1 -1.5mm2.
Cable entry can only be made from the rear of the fan.
1. Select and follow the appropriate wiring diagram. (Fig. 2, 3 or 4)
2. Check all connections have been made correctly and ensure all terminal connections
securely fastened.
3. Ensure the impeller rotates and is free from obstructions.

6
C. SETUP
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING THE INSTALLATION / OR
MAINTENANCE.
ACCESSING THE CONTROL SETTINGS – (Fig. 5 and 6)
1. Loosen the screw in the bottom of the grille and remove the front grille.
2. Carefully pull the inner cap from the centre of the fan away from the chassis.
3. Adjust the settings as outlined below.
TRICKLE SPEED SELECTION (6l/s or 9l/s) – (Fig. 8)
In normal running mode the fan can extract at either 6l/s (22m3/h) or 9l/s (32m3/h) flow rate. The
fan will boost to 15l/s (54m3/h) when the LS connection is switched.
Factory set at 6l/s (22m3/h). (Fig.9)
Remove jumper connector (JP1) if 9l/s (32m3/h) extract flow rate is required. (Fig.9)
BOOST SPEED SELECTION (Fig. 9)
(443175A - Timer, 443176A - Humidistat-Timer and 443177A - Humidistat-Pullcord models only)
The fan has two boost speed settings for different installation requirements:
Max speed: Dip switch 2 in the ‘OFF’ position. (Fig.10)
15l/s speed: Dip switch 2 should be in the ‘ON’ position. (Factory set) (Fig.10)
Dip switch 1 should be in the ‘ON’ position for constant trickle mode.
TIMER ADJUSTMENT (T, TP, HT & HTP MODELS) (FIG. 8)
BEFORE ADJUSTING THE TIMER, SWITCH OFF THE MAINS SUPPLY. TIMER SHOULD
ONLY BE ADJUSTED BEFORE OR DURING INSTALLATION
IMPORTANT NOTE:- ON THE TP & HTP MODELS ONLY THIS ADJUSTS THE OVERRUN
TIME FOR THE PULLCORD OPERATION. ON T&HT MODELS THE TIMER IS ACTIVATED
VIA THE LS CONNECTION.
1. Remove the fan grille. The overrun timer is factory set to approximately
15 minutes. This timer period can be adjusted between approximately 3-30
minutes by altering the adjuster on the control PCB.
2. To REDUCE the operating time, use a small screwdriver to turn the adjuster Fig.8.
CLOCKWISE.
3. To INCREASE the operating time, use a small screwdriver to turn the adjuster
Fig.8. ANTI-CLOCKWISE.
4. Replace the fan grille.

7
HUMIDITY SET-POINT ADJUSTMENT (HT/HTP MODELS) (FIG. 8)
BEFORE ADJUSTING THE CONTROLLER, SWITCH OFF THE MAINS SUPPLY.
HUMIDISTAT SHOULD ONLY BE ADJUSTED BEFORE OR DURING INSTALLATION.
1. Remove the fan grille. The controller is factory set to switch on at about 70% RH.
The humidity set point can be adjusted from 65-95%RH by altering the adjuster on
the control PCB.
2. To LOWER the set-point use a small screwdriver to turn the adjuster Fig.8. ANTI-
CLOCKWISE. This makes the controller MORE sensitive.
3. To RAISE the set-point use a small screwdriver to turn the adjuster Fig.8.
CLOCKWISE. This makes the controller LESS sensitive.
4. Replace the fan grille.
PULLCORD (TP & HTP MODELS ONLY) – The pullcord activates the inbuilt timer overrun
(adjustment settings above). Once activated, the fan will remain on boost for the preset overrun
time. If the pullcord is pulled again during the overrun time period, the timer will reset the
countdown timer back to the preset value. There is no way of switching the fan back to trickle
manually.
D. SERVICING AND MAINTENANCE.
WARNING: THE FAN AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING 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.
Ensure that the fan is switched off from the supply mains before removing the grille.
2. Carefully push the front panel of the grille upwards away from the base part of the grille
(fig. 7).
3. Wipe the inlets and front face with a damp cloth until clean.
The fan has sealed for life bearings, which do not require lubrication.
~
N
L
1 Phase Supply
(220-240V 50Hz). FUSE
Switched
Fused Spur
(3A)
LS12V 0V
Controller
Fan
12V D.C
SELV Supply
NL
LS
LS
N
L
2
1
3
Fig.2 Continuous trickle (6l/s or 9l/s)
with no remote boost facility Note:- (T, TP, HT & HTP – But TP & HTP can be boosted via pullcord)
Fig. 1
Siting
the
fan.
 
PULLCORD
TP & HTP ONLY

8
Fig.3 Continuous boost (15l/s or Max) with no trickle facility (NOT AVAILABLE ON TP & HTP MODELS)
Fig.4 Continuous trickle with boost facility (NOT AVAILABLE ON TP & HTP MODELS)
Fig.5. Removing the grille for wiring and setting the controls
1. Loosen screw. 2. Pull grille slightly away from
bottom edge.
3. Push grille upwards until
clear from the fan chassis.
~
N
L
1 Phase Supply
(220-240V 50Hz). FUSE
Switched
Fused Spur
(3A)
LS
12V 0V
Controller
Fan
12V D.C
SELV Supply
NL
LS
LS
N
L
LINK 2
1
3
~N
LS12V 0V
Controller
Fan
12V D.C
SELV Supply
NL
LS
LS
N
L
2
1
3

9
12
ON
12
ON
Fig.9. Boost speed selection
TIMER, HUMIDISTAT-TIMER AND
HUMIDISTAT-PULLCORD
MODELS ONLY
Max speed boost: Dip switch 2 in the ‘OFF’
position.
15l/s speed boost: Dip switch 2 should be in the
‘ON’ position.
Fig.6. Accessing the control settings Fig.7. Removing the front grille panel for cleaning.
Dip switch
Fig.8. Trickle speed selection and T/HT/HP adjuster
pots
9l/s = Remove Jumper Connector
6l/s = Replace Jumper Connector (factory set)
JP1 Jumper
Timer
adjustment
Humidistat
adjustment
Max =
15l/s =

Notes:-

PRODUCT FICHE
For Residential Ventilation Units (Complying Commission Delegated Regulation (EU)
No 1254/2014)
Name: Vent‐AxiaVent‐AxiaVent‐AxiaVent‐Axia
ModelID(StockRef.):Lo‐CarbonCentra
SELVT‐443175
Lo‐CarbonCentra
SELVHT‐443176
Lo‐CarbonCentra
SELVHTP‐
443177
Lo‐CarbonCentra
SELVTP‐447128
SECClassECCE
SECValue('Average')15.7226.2326.2315.72
SECValue('Warm')7.1111.8611.867.11
SECValue('Cold')30.7551.3151.3130.75
LabelRequired?(Yes/No=Outofscope)NoNoNoNo
Declaredas:RVUorNRVU/UVUorBVURVU‐UVURVU‐UVURVU‐UVURVU‐UVU
SpeedDrive2‐Speed2‐Speed2‐Speed2‐Speed
TypeHRS(Recuperative,Regenerative,None)NoneNoneNoneNone
ThermalEff:[(%),NA(ifnone)]N/AN/AN/AN/A
Max.FlowRate(m3/h)54.0054.0054.0054.00
Max.PowerInput(W):(@Max.FlowRate)2.402.402.402.40
LWA:SoundPowerLevel(dB)33.0233.0233.0233.02
Ref.FlowRate(m3/s)0.010.010.010.01
Ref.PressureDiff.(Pa)N/AN/AN/AN/A
SPI[W/(m3/h)]0.060.060.060.06
ControlFactor&ControlTypology:(CTRL/Typology)
ControlFactor;CTRL0.950.650.650.95
ControlTypologyClockControlLocalDemand
Control
LocalDemand
ControlClockControl
Declared:‐MaxInternal&ExternalLeakageRates(%)for
BVUsorcarryover(forregenerativeheatexchangers
only),
‐&Ext.LeakageRates(%)forDuctedUVUs;
N/AN/AN/AN/A
MixingRateofNon‐DuctedBVUsnotintendedtobe
equippedwithoneductconnectiononeithersupplyor
extractairside;
N/AN/AN/AN/A
PositionanddescriptionofvisualfilterwarningforRVUs
intendedforusewithfilters,includingtextpointingout
theimportanceofregularfilterchangesforperformance
andenergyefficiencyoftheunit
N/AN/AN/AN/A
ForUVUs(InstructionsInstallRegulatedSupply/Extract
GrillesFaçade)InF&WInF&WInF&WInF&W
InternetAddress(forDisassemblyInstructions)www.vent‐
axia.com
www.vent‐
axia.com
www.vent‐
axia.com
www.vent‐
axia.com
Sensitivityp.Variation@+20/‐20Pa:(forNon‐DuctedVus)N/AN/AN/AN/A
AirTightness‐ID/OD‐(m3/h)(forNon‐DuctedVus)N/AN/AN/AN/A
AnnualElectricityConsumption:AEC(kWh/a)0.820.520.520.82
AnnualHeatingSaved:AHS(kWh/a) 
AHS:Average15.7226.2326.2315.72
AHS:Warm7.1111.8611.867.11
AHS:Cold30.7551.3151.3130.75


Head Office: Fleming Way, Crawley, West Sussex, RH10 9YX.
UK NATIONAL CALL CENTRE, Newton Road, Crawley, West Sussex, RH10 9JA
SALES ENQUIRIES: Tel: [phone] Fax: [phone]
TECHNICAL SUPPORT: Tel: [phone] Fax: [phone]
Web:-www.vent-axia.com Email:- [email protected]
As part of the policy of continuous product improvement Vent-Axia reserves the right to alter specifications without notice.
449437 D 1116
The Guarantee
Applicable only to products installed and used in the United Kingdom. For details of guarantee outside the United Kingdom contact your local
supplier.
Vent-Axia guarantees its products for two years from date of purchase against faulty material or workmanship. In the event of any part being found
to be defective, the product will be repaired, or at the Company’s option replaced, without charge, provided that the product:-
Has been installed and used in accordance with the instructions given with each unit.
Has not been connected to an unsuitable electricity supply. (The correct electricity supply voltage is shown on the product rating label
attached to the unit).
Has not been subjected to misuse, neglect or damage.
Has not been modified or repaired by any person not authorised by the company.
IF CLAIMING UNDER TERMS OF GUARANTEE
Please return the complete product, carriage paid to your original supplier or nearest Vent-Axia Centre, by post or personal visit. Please ensure
that it is adequately packed and accompanied by a letter clearly marked “Guarantee Claim” stating the nature of the fault and providing evidence of
date and source of purchase.
The guarantee is offered to you as an extra benefit, and does not effect your legal rights