NuAire MEV-X Instruction Manual

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nuaire.co.uk 029 2085 8400 26. 02. 24. Document Number 671924
The EMC
Directive
2014/30/EU
The Low Voltage
Directive
2014/35/EU
MEV-X
Continuous Extract Unit
Installation and Maintenance
1.0 SAFETY INFORMATION
•The provision of the electrical supply and the connection of the unit to the
mains must be carried out by a qualified electrician.
•Isolate from power supply before removing any covers. During installation /
maintenance ensure all covers are fitted before switching on the mains supply.
•All-pole disconnection from the mains as shown in the wiring diagram must
be incorporated within the fixed wiring and shall have a minimum contact
separation of 3mm in accordance with latest edition of the wiring regulations.
•This unit must be earthed.
•Ducting must be securely fixed with screws to the spigot to prevent access to
live parts. Duct runs terminating close to the fan must be adequately protected
by suitable guards.
•If the supply cord is damaged, it must be replaced by the manufacturer, its
service agent or similarly qualified persons in order to avoid a hazard.
•Precautions must be taken to avoid the back-flow of gases into the room from
the open flue of gas or other fuel-burning appliances.
•This appliance should not be used by children or persons with reduced
physical, sensory or mental capabilities or lack of experience and knowledge,
unless they have been given supervision or instruction concerning the safe
use of the appliance by a person responsible for their safety. Children shall not
play with the appliance. Cleaning and user maintenance shall not be carried
out by children.
2.0 INTRODUCTION
The MEV-X is designed to provide continuous mechanical extract
ventilation to dwellings in accordance with Part F of the building
regulations, the unit is listed on the Product Characteristics
Database (PSDB).
The unit may be used for supply or extract, however, the dierent
applications will require variations to the completed installation
e.g. filtration, insulation. Contact Nuaire to discuss the full system
design requirements.
This appliance should not be used by children or persons
with reduced physical, sensory or mental capabilities or
lack of experience and knowledge, unless they have been
given supervision or instruction concerning the safe use
of the appliance by a person responsible for their safety.
Children shall not play with the appliance. Cleaning and user
maintenance shall not be carried out by children.
IMPORTANT

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nuaire.co.uk 029 2085 8400 26. 02. 24. Document Number 671924
Installation Manual MEV-X
4.0 DIMENSIONS
Airflow
151
150
70 81
590
560
131 230
303
20 220
230
10
25 165
40
35
Mains Entry (Allow 20mm Clearance)
1 Unit Dimensions (mm)
The unit is not fitted with a back-draught shutter or filter
as standard. These should be integrated into the system
design where appropriate and can be purchased from Nuaire
if required. If extracting from a dwelling it is advised the
incoming air to the unit is filtered to minimum grade of G2.
It is recommended that rigid ducting be used it all times. Flexible
ducting has a very high resistance and it is impossible to calculate
how much resistance will be on a system if used.
If used, the flexible ducting must be kept to a minimum and
should always be pulled taut. A maximum of 300mm should be
used on each leg.
If used to supply fresh air from outside the heated envelope of
the dwelling, the duct should be insulated with material having
a thermal resistance of >0.625m2 K/w, in order to prevent
condensation on the exterior of the duct to the unit.
Ducting must be installed in such a way that resistance to airflow
is minimised. Bends should be kept to a minimum.
A minimum distance of 200mm between the appliance and any
bends in ductwork is recommended. Ideally 200mm diameter or
220 x 90mm rectangular ducting should be used.
Ducting joints must be sealed with silicone type sealant and shall
be adequately and reliably fixed to the appliance.
3.2 Pre-Commissioning
The unit must not be used during site construction or the clean-
up period as cement and plaster dust can be abrasive which may
aect fan performance and reliability.
While the property is drying out, very high moisture levels are
likely to occur. Therefore it is advisable that if the installation and
building works are complete the unit is left running. If the building
works are not complete, please close or cover the air valves to
prevent condensation forming in the ductwork and unit due to
natural migration of warm air.
3.0 INSTALLATION
The provision of the electrical supply and the connection of the
unit to the mains must be carried out by a qualified electrician.
All-pole disconnection from the mains as shown in the wiring
diagram must be incorporated within the fixed wiring and shall
have a minimum contact separation of 3mm in accordance with
latest edition of the wiring regulations. Ensure that the mains
supply (Voltage, Frequency and Phase) complies with the rating
label.
Please note sucient access and a clear working space
around the unit is required to allow access for commissioning
and also for maintenance of key components, please allow
a minimum of 110mm from the access panels (Figure 1). An
additional 20mm will be required at the mains entry point to
allow cable routing, this distance will be greater if using an
additional cable gland.
The unit is designed to be installed predominantly on a ceiling/
slab, the unit must not be floor mounted. If wall mounting
to prevent potential water ingress the cable entry should be
on the underside of the unit or replaced with a sealed cable
gland, the unit must also be mounted square to prevent
ingress around the PCB cover.
The unit must be installed indoors, on a suitable wall away
from direct sources of frost, heat and water spray or moisture
generation. For a vibration-free result the unit must be mounted to
a solid structure.
The unit can be secured in place using the four mounting holes
(fixings supplied by others) provided (Figure 2).
To ensure vibration is not transferred into the structure, it is
advised to fit a small spacer (supplied) between the unit and
the mounting surface at each fixing point.
3.1 Ducting
Ducting must be securely fixed with screws to the spigot to
prevent access to live parts. Duct runs terminating close to the fan
must be adequately protected by suitable guards.
Precautions must be taken to avoid the back-flow of gases
into the room from the open flue of gas or other fuel-burning
appliances.

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nuaire.co.uk 029 2085 8400 26. 02. 24. Document Number 671924
Installation Manual MEV-X
5.0 ELECTRICAL CONNECTION
For good EMC practice, any sensor cable or switched live
cables should not be placed within 50mm of, or on, the same
metal cable tray as other cables.
IMPORTANT
All electrical connections must be carried out by a qualified
electrician.
If the supply cord is damaged, it must be replaced by the
manufacturer, its service agent or similarly qualified persons in
order to avoid a hazard.
If wall mounting to prevent potential water ingress the cable entry
should be on the underside of the unit or replaced with a sealed
cable gland, the unit must also be mounted square to prevent
ingress around the PCB cover.
The supply cord should be run so the lowest point is below the
cable entry grommet to prevent water ingress.
5.1 Examples of Typical Wiring Layouts
The below are examples of potential wiring layouts, alternatives
are possible and may be required depending on the installation
requirements.
Electrical details:-
Voltage: 230V 1ph 50Hz
Consumption: 1.1 A
Note: The unit must be earthed.
The cable from the mains power supply should be connected to
a fixed wiring installation via a fused isolator in accordance with
current wiring regulations.
136
269
Ø6.6
272
538
2 Mounting Hole Dimensions
O Y W B L L
SLSUPPLY
WARNING
HIGH VOLTAGE651616 A0
FANCTRL
N 1 2
Speed 2
230 V
Mains
Connection
Motor
Connections
Speed 3
N
SP1 SP2 SP3
3 PCB Detail
All-pole disconnection from the mains as shown in the
wiring diagram must be incorporated within the fixed wiring
and shall have a minimum contact separation of 3mm in
accordance with latest edition of the wiring regulations.
IMPORTANT

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nuaire.co.uk 029 2085 8400 26. 02. 24. Document Number 671924
Installation Manual MEV-X
MAINS
230 V
50 Hz
Green / Yellow
Blue
Brown
Fuse 2 A ON / OFF
Switch
2 Pole
Isolator
E
N
L
O
Y
W
B
L
N
E
E
1
2
Prewired
Connections
N
L
4 Single Speed Wiring
MAINS
230 V
50 Hz
N
L
Green / Yellow
Blue
Brown
Fuse 2 A ON / OFF
Switch
2 Pole
Isolator
2 Pole
Isolator
E
N
L
O
Y
W
B
L
N
E
E
1
2
Supply Cord
to Damper
Prewired
Connections
5 Single Speed Wiring with Mains Activated Back-draught Damper
MAINS
230 V
50 Hz
N
L
Fuse 2 A
2 Gang, 2 Way Switch
Ancillary Code: 771483
3 Pole
Isolator
L3 Low
L2 High
L3 Off
L2 OnL1
E
N
L
1
2
O
Y
W
B
L
N
E
E
Prewired
Connections
6 Two Speed Wiring
MAINS
230 V
50 Hz
N
L
Fuse 2 A
Boost Switch
Speed 2 Boost Switch
Speed 3
3 Pole
Isolator
E
N
L
1
2
O
Y
W
B
L
N
E
E
Prewired
Connections
7 Three Speed Continuous Trickle Wiring with Two Boost Speeds

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nuaire.co.uk 029 2085 8400 26. 02. 24. Document Number 671924
Installation Manual MEV-X
6.0 COMMISSIONING
The unit oers up to three independently variable speeds
depending on the required installation and wiring configuration
(Section Figure 5.0). To adjust the speed, remove the blanking
screw from the appropriate speed control set point and rotate
the pot in the desired direction using a small terminal screwdriver
(Figure 8).
Ensure the blanking screws are replaced after removing to ensure
IPX2 protection.
Commissioning should be carried out in accordance with building
regulations.
A calibrated moving vane anemometer and hood will be required
to carry out commissioning.
Adjustment valves should be locked in place to prevent further
adjustment.
Once commissioned, the home owner / tenant should be
informed that the unit should not be adjusted as it will have a
detrimental eect on the indoor air quality.
SPEED
AIRFLOW
(REMOVE BLANKING SCREWS TO ACCESS SPEED ADJUSTMENT)
CONTROL
1 2 3
061124
8 Commissioning Set Points
7.0 MAINTENANCE
It is inevitable that even with filtered extract grilles fitted, some
dust, flu 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 lead to overheating of the motors.
Consequently, it is strongly recommended that all units are
inspected and cleaned every year.
8.0 REPLACEMENT OF PARTS
Should any component need replacing, Nuaire keep extensive
stocks for quick delivery. Ensure that the unit is electrically
isolated, before carrying out any work.
Note: The supply cable must be replaced by an electrically
competent person.
When ordering spare parts, please quote the serial number of
the unit and the ARC number of the purchase, if possible. (This
information will be available on the fan label).
9.0 WARRANTY
The 2 year warranty starts from the day of delivery and includes
parts and labour.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or
not installed, commissioned and maintained in accordance with
the details contained in this manual and general good practice.
The product warranty applies to the UK mainland and in
accordance with Clause 14 of our Conditions of Sale. Customers
purchasing from outside of the UK should contact Nuaire
International Sales oce for further details.
Only genuine Nuaire parts and filters may be used to maintain
the unit.
10.0 AFTER SALES
For technical assistance or further product information, including
spare parts and replacement components, please contact the
After Sales Department.
Telephone [phone]
[email protected]
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.

NOTES
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nuaire.co.uk 029 2085 8400 26. 02. 24. Document Number 671924
Installation Manual MEV-X