NuAire MEV-X Instruction Manual

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nuaire.co.uk 029 2085 8400 30. 05. 19. 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 different
applications will require variations to the completed installation e.g.
filtration, insulation. Contact Nuaire to discuss the full system design
requirements.
IMPORTANT
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 super-
vision 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.

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nuaire.co.uk 029 2085 8400 30. 05. 19. Document Number 671924
Installation and Maintenance MEV-X - Continuous Extract Unit
4.0 DIMENSIONS (mm)
4.1 Unit Dimensions
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 affect 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.
Airflow
151
150
70 81
590
560
131 230
303
20 220
230
10
25 165
40
35
Mains Entry (Allow 20mm Clearance)
Figure 1. Unit Dimensions
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 sufficient 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 30. 05. 19. Document Number 671924
Installation and Maintenance MEV-X - Continuous Extract Unit
5.0 ELECTRICAL CONNECTION
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.
IMPORTANT
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.
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
IMPORTANT
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.
Figure 3. PCB
5.2 Mounting Hole Dimensions
136
269
Ø6.6
272
538
Figure 2. Mounting Hole Dimensions

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nuaire.co.uk 029 2085 8400 30. 05. 19. Document Number 671924
Installation and Maintenance MEV-X - Continuous Extract Unit
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
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
5.2.2 Two Speed Wiring
5.2.3 Three Speed Continuous Trickle Wiring with Two Boost Speeds
Figure 6.
Figure 7.
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
5.2.4 Single Speed Wiring with Mains Activated Back-draught Damper
Figure 5.
Figure 4.
5.2.1 Single Speed Wiring
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

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nuaire.co.uk 029 2085 8400 30. 05. 19. Document Number 671924
Installation and Maintenance MEV-X - Continuous Extract Unit
7.0 MAINTENANCE
It is inevitable that even with filtered extract grilles fitted, 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 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).
Telephone [phone]
[e-mail]
6.0 COMMISSIONING
The unit offers up to three independently variable speeds depending
on the required installation and wiring configuration (Section 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 4).
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 effect on
the indoor air quality.
Figure 8. Commissioning Set Points
9.0 WARRANTY
The 5 year warranty starts from the day of delivery and includes parts
and labour for the first year and parts only for the remaining 4 years.
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 office for
further details.
10.0 AFTER SALES
For technical assistance or further product information, including spare
parts and replacement components, please contact the After Sales
Department.