NuAire MEV-M Instruction Manual

Contents Page
Introduction 1
Codes 1
Dimensions 2
Installation 2
Adjustments 3
Installing / Removing the blowers 3
Optional Fault Indication 4
Electrical data 4
Wiring Diagrams 4
Certification 5
Maintenance 6
Spares & Service 6
NuAire Home Ventilation
Western Industrial Estate Caerphilly,
CF83 1XH United Kingdom.
Telephone: [phone]
Facsimile: 08705 002666
Email: [email protected]
www.nuaire.co.uk
Leaflet 671123
JULY 2001
MEV-M units
Continuous Mechanical Extract
Ventilation Units
NOTE:
THIS UNIT IS DELIVERED WITH THE BLOWER
SECTION PACKED ‘LOOSE’ INSIDE THE CASE
FOR FIXING SEE PAGE 2
Introduction
NuAire's MEV-M units are designed to be installed into duct-
work above the area to be ventilated (usually in the ceiling void).
The units provide mechanical extract ventilation for homes in
accordance with BRE digest 398. Single, twin and dual fan units
are available
The case is constructed in galvanised steel. Internal faces of the
casing are acoustically lined. The full length access cover is
retained by four screws. An integral fixing bracket with a single
screw fixing allows easy mounting and removal of the unit when
necessary. The unit is delivered with the 200mm dia discharge
spigot fitted.
Various ‘knockout’ inlet spigot positions can be utilised. All inlet
spigots are ’closed’ as knockouts when delivered. A full kit of
inlet spigots with integral balancing dampers is supplied bagged
separately.
The inlet spigot locations are as follows:
One x 150mm end knockout.
Two x 100mm knockouts on LH side of case.
Two x 100mm knockouts on RH side of case.
Any, or all, of these inlets can be utilised. User removes the
knockout(s ) and fits the balancing spigot(s) supplied.
A filter frame with a replaceable filter is ‘push fit’ located inside
the case which is easily removed for cleaning following removal
of the case cover.
The fan is designed to be wired direct to the mains supply
through a fused spur isolator (by others) and run continuously in
the NORMAL mode (which is the low speed or trickle ventila-
tion setting). The degree of extract from each room served can be
adjusted with the inlet balancing spigots.
The unit is provided with adjustment for the trickle (low speed
or NORMAL) and high speed (BOOST) ventilation as standard.
The NORMAL speed adjustment has a range of 0% to 50%.
The unit is delivered with the NORMAL speed adjustment set to
0%. Note: the NORMAL speed must be set to 25% by the
installer.
An adjustment of 50 -100% is provided for the ‘BOOST’ duty
setting to reduce performance if necessary.
The unit is delivered with the BOOST speed adjustment set to
100%. (See the adjustments information on page 3). A manual
remote switch is provided to activate the NORMAL and BOOST
functions (see fig. 2).
Provision is also made for the wiring in of an optional remote fail
indicator (not supplied). Order item HVCT-AVI.
Coding
MEV-M Single fan unit
MEV-2M Twin fan unit (with auto duty sharing)
MEV- M+ Dual fan unit (both fans continuous running)
Duty
Units are available with one or two fans and with the following
duties:
100 l/s (MEV-M & MEV-2M)
The MEV-M has a single fan and delivers 100 l/s
The MEV-2M has two fans and delivers 100 l/s with automatic
duty sharing to extend unit operational life. Also the unit will
switch to the ‘standby’ fan in the event of a fan failure.
150 l/s (MEV-M+).
The MEV-M+ has two fans which run continuously and deliver
150 l/s. In the event that one fan fails, the other will still deliver
100 litres as a single fan until the unit is serviced.
Installation
and Maintenance
1
Fig. 1.
General view of unit.
IMPORTANT WARNING
Installation and servicing MUST be carried out
by electrically quaIified personnel.
The unit MUST BE TOTALLY ISOLATED from the
electrical supply before removing covers.
NOTE internal input socket will be exposed and
MAY BE LIVE with the fan module removed.
See ‘ISOLATION’ notes.

500
330
200 dia
170
Bracket
fixing
VIEW ON 'A'
(COVER REMOVED)
SIDE VIEW
Cable
entry
MOUNTING
BRACKET
Mounting bracket
Filter
END VIEW
Single screw unit fixing
250
20
'A'
140
4 holes
7.5 dia
AIRFLOW
AIRFLOW
4 x Spigot
knockouts
100 dia
1 x Spigot
knockout
150 dia
50
Installation and Maintenance MEV-M & UNITS
2
Installation
General notes: It is assumed that a solid non-reverberant
mounting position has been selected and the electrical mains
wiring and any optional remote indicator wires have been made
ready.
It is also assumed that compatible ductwork is already installed
and ready to be connected to the 200mm dia outlet and also the
chosen 150mm dia and/or 100mm dia. inlets. Note the unit is not
fitted with a backdraught shutter. (When using the trickle vent facility
a backdraught shutter is not needed). However a backdraught shutter is
available from NuAire if required.
Fitting the blower(s).... see fig. 6
ON DELIVERY IT WILL BE NECESSARY TO FIT THE
MOTOR PLATE COMPLETE WITH THE BLOWERS TO
THE PLENUM PLATE.
Remove the cover. Withdraw the filter assembly from the case
(push fit). Lift out the loose blower assy. Remove the two motor
plate retaining screws located in the plenum plate. These will be
required to fix the motor plate. in position. Refer to Fig. 6.
Locate the bottom of the motor plate into the channel in the bot-
tom of the case (C) Swing up the motor plate flush to the
plenum (B) Fix with the two retaining screws (A)
Fit the filter assy.
Spigot fixing
Note it is important to have the cover screwed in position prior
to knocking out 100 and 150mm dia. inlets. Without the cover
fixed in position the case could be distorted during this operation.
Select the chosen size balancing spigots and fix to the case using
the holes provided.
Unit fixing
The fixing bracket can be offered up to position, the fixing points
marked through and the bracket installed with 4 screws (by oth-
ers).
Offer the unit into position and locate the bracket into the slots in
the case before fixing with the single bracket fixing screw. (See fig
3) Connect the ductwork to the inlet and outlet spigots
Electrical connection
With the unit fixed in position and working from underneath the
installation, remove the unit cover, retained by 4 screws. Bring
the external wiring through the chosen rubber cable entry grom-
met (one either side, see fig 2 ).
It may be found easier to remove the terminal block from the
case (2 screws) to connect external wiring. (see fig 4). To gain
access to the terminal block, pull out the electronic control mod-
ule approx. 15mm to disengage the electrical spade contacts, dis-
connect the motor wiring plug(s) from the module and
temorarily remove the control module. The block
can now be removed (2 screws) to facilitate the connection of the
wiring.
The earth wire MUST be connected to the Earth post
provided next to the terminal block. (Fig 4 ). Note that no
earth is required to the terminal block.
Refer to the electrical wiring diagrams before connecting the unit.
NOTE THAT THE MAINS WIRING FOR THE UNIT
MUST BE FROM A FIXED WIRING INSTALLATION.
Connect the wires as shown in the diagram and refit the terminal
block. Locate the control module into the blowers moulded
guides and push the module into the terminal block, engaging
the spade connectors.
Dimensions
Fig 2
Fig 3 Installing the unit
into the fixed bracket.
Fig 4 Internal view. Control module has
been removed to access the terminal block

Electrical
terminal
block
Cable
grommet
Blower plate
fixing screws (2)
Blower
assembly
Earth
post
Weights
MEV-M 11 kg
MEV-2M 12 kg
MEV-M+ 12 kg
NORMAL
BOOST
85
85
10
Boost Switch (supplied).

Fig 5 Control module adjustments
Adjusting the Full Speed (BOOST)
ENSURE THE UNIT IS ISOLATED BEFORE
REMOVING THE COVER
All the control functions and adjustments are located on the
Electronic Control Module
The ‘Full Speed’ adjustment is located on the Electronic Control
Module see fig 5. The adjustment range is 50 - 100% speed. Set
to 100% for optimum performance.
Note the screw adjustment is pre-set at the factory to full
speed (100%).
The performance of the unit can be reduced if required by rotat-
ing the screw anti-clockwise. (Fully anti-clockwise will give 50%
of the available duty).
Using and adjusting the Low Speed
(NORMAL) trickle ventilation
ENSURE THE UNIT IS ISOLATED BEFORE
REMOVING THE COVER
The ‘Low Speed’ adjustment (used for trickle ventilation) is
located on the Electronic Control Module see fig 5.
The adjustment range is 0 - 50% speed.
Note the screw adjustment is set at the factory to zero and
MUST BE SET TO A MINIMUM OF 25%
The remote switch connection must be made in order to use the
‘BOOST’ facility. The switch terminals are numbered 3 & 1 on
the terminal block. See wiring diagram on page 4.
Removing the blower(s) see fig.6
Assuming that the control module has been unplugged
from the terminal block, the external electical wiring
disconnected and the complete unit removed from
the installation.
1. Withdraw the filter assembly from the case
2. Unscrew the two motor plate retaining screws (A).
3. Allow the upper edge of the plate to drop away
from the fixed plenum plate to clear the other
fixings (B).
4. Pull the motor plate assembly up out of the
locating channel in the bottom of the case and
remove the assembly
Run On Timer (not used)
A Run On Timer adjustment is also located on the Electronic
Control Module (see fig 5). Its function is not required for this
unit.
Note the unit is delivered with the Run On timer screw set
to zero.
THE RUN ON FACILITY IS NOT REQUIRED IN
THESE APPLICATIONS AND SHOULD BE LEFT SET
AT ZERO.
Fig 6 Fitting / removing the motor plate assembly
Installation and Maintenance MEV-M & UNITS
3
Motor plate
fixing screws (2)
C
Motor plate
locates into
bottom channel
Terminal
block
Control
module
pulls out
to remove
Fixed
plenum
plate
Control
module
A
B
Hinge motor
plate assy forward
during fitting
and removal
Electronic
control
module
Run On Timer
Fail LED
Run LED
Full Speed
50 - 100%
Low Speed
0 - 50%
(trickle vent)

Installation and Maintenance MEV-M & UNITS
Audio Visual Fault Indicator
(optional).
Fig 7 HVCT-AVI
Code: HV CT-AVI
In the event of a fan failure the device shows a visual red light
and an internal sounder is activated. Supplied with a 10 metre
connecting cable which plugs into the fan control module.
The CT-AVI does not wire into the terminal block inside the
fan. It is supplied with a pre-plugged 10 metre cable. This cable
plugs into matching 4 way sockets fitted in the CT-AVI and fan
control module
Electrical Data
Unit power consumption (watts) @ full speed
MEV-M ..........................................100 watts
MEV-2M ..........................................100watts
MEV-M+ ..........................................200watts
Full load current (amps).
MEV-M .......................................... 0.39 amps
MEV-2M ..........................................0.39 amps
MEV-M+ ......................................... 0.78 amps
Audio Visual
Fault Indicator
Status
Fault
.
Earth
post
Fan
terminal
block
Fan
terminal
block
N
L
Fuse 2A max.
Unit serving
Kitchen and Bathroom
230V
1ph
50Hz
supply
3
1
N
L
2
Room
light
Normal /Boost
switch (kitchen)
Light switch
(bathroom)
Light switch
(double pole)
Earth
post
N
L
Fuse 2A max.
Unit serving
Kitchen and two Bathrooms
230V
1ph
50Hz
supply
3
1
N
L
2
Room
lights
Normal /Boost
switch (kitchen)
Earth
post
Fan
terminal
block
N
L
Fuse 2A max.
Unit serving
Kitchen and Utility
and Bathroom
230V
1ph
50Hz
supply
3
1
N
L
2
Room
light
Normal /Boost
switch kitchen
(Supplied)
Normal /Boost
switch utility
(Not supplied)
Light switch
(bathroom)
Fig 8 Wiring for various unit applications.
Unit Wiring
FULL SPEED OPERATION WITH TRICKLE
VENTILATION (fig 8)
Wiring for full speed operation with trickle ventilation
Note: Trickle vent (NORMAL) adjustment screw on
Electronic Control Module must be set to a minimum of
25% and full speed (BOOST) set to 100%

We declare that the machine named below
conforms to the requirements of EC Council Directives
relating to Electromagnetic Compatibility and
Safety of Electrical Equipment.
Designation of machinery :- CONTINUOUS VENTILATION UNITS
Machinery Types :- MEV-M, MEV-2M, MEV-M+
Relevant EC Council Directives :- 89/336/EEC, 92/31/EEC (EMC)
73/23/EEC, 93/68/EEC (Low Voltage Directive)
Applied Harmonised Standards :- E50081-1, EN50082-1, EN60204-1
EN60335-2-80
Basis of Self Attestation :- Quality Assurance to BS EN ISO 9001
BSI Registered Firm Certificate No. FM 149
Signature of manufacture representatives :-
Name: Position: Date:
1) C. Biggs Technical Director 2. 7. 01
2) W. Glover Manufacturing Director 2. 7. 01
NuAire Limited,
Western Industrial Estate,
Caerphilly, Mid Glamorgan,
CF83 1XH. United Kingdom.
Telephone: [phone]
Fax: [phone]
Email: info @ nuaire. co. uk
www.nuaire.co.uk
JULY 2001
DECLARATION
OF CONFORMITY

Western Industrial Estate, Caerphilly,
Mid Glam CF83 1XH United Kingdom.
Telephone: [phone] Facsimile: 08705 002666,
Email: [email protected]
www.nuaire.co.uk
Leaflet No. 671123
Technical or commercial considerations may, from time to time,
make it necessary to alter the design, performance and dimensions
of equipment and the right is reserved to make such changes
without prior notice.
NB
If you have any comments or queries on any of our products
or services please write to the Product Information Manager at
the main address opposite
GP
Service
As a manufacturer NuAire provides you with factory trained
Service Engineers.
Our Engineers are supported by a comprehensive range of spare
parts 'off the shelf'.
If you are an industrial or commercial user, you may be interested
in details of NuAire's regular maintenance Service Contracts.
This is a worthwhile service that helps you get the most from our
products.
Our Service Department will be happy to give you more
information.
Telephone: [phone]
Controls Application Service (CAS)
A team of Engineers and technicians is available to provide pre
and post order support.
We are on hand to provide help and advice from the most basic
use of any NuAire equipment to the more complex applications,
maximising on the versatility of our SMART and NetLink con-
trol products.
Telephone: [phone]
Facsimile: 029 2085 8586
3 Year Warranty
The three year warranty starts from the date of delivery and
includes parts and labour for the first year.
The labour element is subject to full, free and safe access to the
equipment as recommended by the CDM regulations.
The remaining two years covers replacement parts only.
NOTE:
Installation & Maintenance of the equipment must be as
directed in the instructions provided with the unit.
6
Maintenance
General
It is inevitable that some dust, fluff etc. will pass through the
filter, and which, if allowed, will build up internally on
motors and impellers, shortening the life of the unit and, in
severe cases, leading to overheating of the motors.
Consequently, it is strongly recommended that all units are
inspected and cleaned every six months. To clean the filter,
remove from the unit and wash in tepid water to which a
little mild detergent has been added. Shake out excess water
and allow to dry naturally. Replace when dry.
Isolation
Ensure that the unit is totally isolated from the electrical
supply. This is particularly important when dealing with a
run-on circuit AS INPUT SOCKET TERMINALS
WITHIN THESE UNITS REMAIN LIVE, EVEN WHEN
THE ROOM LIGHT OR OTHER ACTUATING
SWITCH IS OFF. Take care therefore when working within
the case with the fan module removed.
Procedure for inspection & cleaning
See ‘Removing the Blower assembly’ Inspect all parts.
With a brush or dry cloth clean the backplate. Lightly brush
away dust and dirt from the fan module. If stubborn debris
persists, carefully remove with a suitable blade or scraper.
Wash the cover in warm soapy water. Dry thoroughly. Refit
the fan module and electronic module followed by the cover.
Test/run the unit.
Spares
OPUS MEV single & twin fans
ITEM PART No.
Filter (all units). 040689
ELECTRONIC CONTROL MODULE
Single fan MEV-M 772270
Twinfan MEV-2M 772271
Dual fan MEV-150M 772272
BLOWER ASSEMBLIES
MEV-M single fan units 772273
MEV-2M twin fan units 772274
MEV-150M twin fan units 772274
Installation and Maintenance MEV-M & UNITS