Vent-Axia MULTIVENT MV250 Assembly instructions

PLEASE READ INSTRUCTIONS IN CONJUNCTION WITH THE ILLUSTRATIONS.
PLEASE SAVE THESE INSTRUCTIONS
MULTIVENT
MV250
MEV Unit
Stock Ref. N°
MV250 181510C
Installation and Wiring Instructions
220-240V~50Hz
IP22

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Installation and Wiring Instructions for the Multivent Extract Fan.
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 exhaust air temperatures higher than 40°C or less than –5°C.
•Relative humidity above 90%
• Possible obstructions which would hinder the access or removal of the Unit.
•Sudden ductwork bends or transformations close to the Unit.
SAFETY AND GUIDANCE NOTES
A. All wiring must be in accordance with the current I.E.E. Regulations, or the appropriate
standards of your country.
B. The Unit should be provided with a local double pole isolator switch having a contact
separation of at least 3mm. The fuse rating should be 3A.
C. Ensure that the mains supply (Voltage, Frequency and Phase) complies with the rating
label.
D. The Unit should only be used in conjunction with the appropriate Vent-Axia products.
E. It is recommended that the connection to the terminal box is made with flexible
cable/conduit.
F. The Unit should not be sited within 600mm horizontally of/or 2250mm vertically of a
bath/shower tray, in accordance with the current I.E.E. Regulations for bathrooms.
G. When the unit 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.
H. The installer must ensure that the Unit intake is located a minimum of 600mm from any
flue outlet.
I. This Unit is designed as an inline ducted unit to be positioned between lengths of
ducting. Short duct runs terminating within 1.5m must incorporate suitable guards
unless the unit is mounted higher than 2.3m.
J. This Unit should not be used where it is liable to be subject to direct water spray from
hoses etc.
K. This Unit handles moisture-laden air, ensure that a condensation drain is fitted.
L. This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory and mental capabilities or lack of experience and knowledge
if they have been given supervision or instruction concerning the use of the appliance
in a safe way and understand the hazards involved.
M.Children shall not play with the appliance.
N. Certain applications may require the installation of sound
attenuation material to achieve the sound levels required.
O. Ducted ventilators must be ducted to the outdoors.
TYPICAL INSTALLATION

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INTRODUCTION NOTES
The MULTIVENT is designed for simultaneous ventilation for a maximum of up to four separate areas such
as bathrooms, kitchens and toilets. The range can be mounted in three different orientations for convenient
installation in roof voids with a height of 250mm or greater. The MV250 employs a highly efficient backward
curved centrifugal motor impeller set. It is designed for continuous 24-hour use and should not be used in
conjunction with a delay timer.
This product must be installed in accordance with the Domestic Ventilation Compliance Guide (England and
Wales).
SITING
It is the responsibility of the installer to ensure that all aspects of system design are taken into
consideration.
MULTIVENT is designed as a ducted unit and should only be used in ducted applications. Short duct runs,
terminating
close to the fan (i.e. within 1.5m), must incorporate suitable guards. Between two and four intake ducts may
be used, three on the case sides and one in the base.
The MULTIVENT may be mounted in three orientations.
a). Base mounted Installation with ducting radiating out horizontally. The Condensate Drain is on the
opposite side to the exhaust spigot at the base of the unit.
CondensateDrain
On the unit housing.
b). Vertically mounted Installation with the exhaust spigot at top. The Condensate Drain is opposite to the
exhaust spigot at the base of the unit. Additional drainage may be required from the duct connected to the
bottom spigot.
Condensate Drain
On the unit housing.

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c). Ceiling mounted Installation. The Condensate Drain is opposite to the exhaust spigot under the lid of
the unit. Additional drainage may be required.
Condensate Drain
Underthelid.
See the dimensional details below for the mounting hole positions.
INSTALLATION
1. Position the MULTIVENT, taking into consideration the position of the rooms to be ventilated, the
exhaust position, the drainage position and the electrical services. Ensure there is adequate access for
installation and maintenance. Securely mount the MULTIVENT through the mounting brackets on the
casing using the appropriate anti-vibration mounts, screws, washers, rubber bushes etc.
2. Where the intake and exhaust ducts are to be connected to the MULTIVENT, remove the spigot caps, if
125mm ducting is being used. If 100mm ducting is being used, peel out the centre of the cap with a
screwdriver as indicated and leave the cap surround in position. To connect ducting to the base intake,
use a suitable adaptor attached using the 4 holes provided.
3. Ducting passing through an unheated roof void should be insulated. Ducting runs should be as straight
as possible and intake ducting should slope downwards from Under the lid. Connect ducting to the
MULTIVENT spigots and to appropriate ceiling terminations.
4. Select the drain spigot required, remove the “Knockout” and connect a suitable drainage system.
Condensate drain
On the unit housing
Condensate drain
Under the lid

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WIRING
WARNING: THE MULTIVENT AND ANCILLARY CONTROL EQUIPMENT MUST BE
ISOLATED FROM THE POWER SUPPLY DURING THE INSTALLATION / OR
MAINTENANCE.
THE MULTIVENT UNIT MUST BE EARTHED.
Access to the MULTIVENT connection terminals is under the top cover which is retained by four screws.
Ensure that the mains supply voltage, frequency, number of phases and power rating comply with the details
on the rating label positioned under the top cover.
All wiring must be in accordance with local and/or national electrical codes as applicable or the appropriate
standard in your country (BS7671 in the UK). The MULTIVENT must be supplied through a double-pole
isolating switch, having a contact separation of not less than 3mm. Cable clamps are provided for use with the
cable or flex on entry into the MULTIVENT.
To meet the stated energy efficiency rating, the Multivent MV250 range should be connected so that it
can run at all three speeds, with to at least two sensor inputs. A possible wiring arrangement is shown in
Figure 2.
Fig.1.
Power connection for speed selection

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Fig.2.
Example wiring for 3 speeds with three external sensors
OVER-HEATING PROTECTION
The MULTIVENT motor is fitted with Standard Thermal Overload Protection. This will automatically switch
the fan Off in the event of a fault condition.
If this occurs isolate the MULTIVENT, check for and remove any obstruction, leave for a short time for the
motor to cool before reconnecting. If this recurs, Isolate the MULTIVENT and call a service engineer.

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PRODUCT FICHE
For Residential Ventilation Units (Complying Commission Delegated Regulation (EU)
No 1254/2014)
Name: Vent‐Axia
ModelID(StockRef.):MV250‐181510‐LDC
SECClassC
SECValue('Average')‐25.71
SECValue('Warm')‐10.21
SECValue('Cold')‐52.78
LabelRequired?(Yes/No=Outofscope)Yes
Declaredas:RVUorNRVU/UVUorBVURVU/UVU
SpeedDriveMulti‐Speed
TypeHRS(Recuperative,Regenerative,None)None
ThermalEff:[(%),NA(ifnone)]N/A
Max.FlowRate(m3/h)489.6
Max.PowerInput(W):(@Max.FlowRate)63.3
LWA:SoundPowerLevel(dB)51.53
Ref.FlowRate(m3/s)0.10
Ref.PressureDiff.(Pa)185
SPI[W/(m3/h)]0.16
ControlFactor&ControlTypology:(CTRL/Typology)
ControlFactor;CTRL0.65
ControlTypologyLocalDemandControl
Declared:‐MaxInternal&ExternalLeakageRates(%)forBVUsor
carryover(forregenerativeheatexchangersonly),
‐&Ext.LeakageRates(%)forDuctedUVUs;
<5%Internal,<5%External
MixingRateofNon‐DuctedBVUsnotintendedtobeequipped
withoneductconnectiononeithersupplyorextractairside;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
ForUVUs(InstructionsInstallRegulatedSupply/ExtractGrilles
Façade)InF&W
InternetAddress(forDisassemblyInstructions)www.vent‐axia.com
Sensitivityp.Variation@+20/‐20Pa:(forNon‐DuctedVUs)N/A
AirTightness‐ID/OD‐(m3/h)(forNon‐DuctedVUs)N/A
AnnualElectricityConsumption:AEC(kWh/a)1.03
AnnualHeatingSaved:AHS(kWh/a)
AHS:Average28.30
AHS:Warm12.80
AHS:Cold55.36

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Disposal
This product should not be disposed of with household waste. Please recycle where
facilities exist. Check with your local authority for recycling advice.
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] Email:- [email protected]
TECHNICAL SUPPORT: Tel: [phone] Fax: [phone] Email:- [email protected]
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.
407445D 1217
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