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26. 05. 20. Document Number 671944
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
MEV-ECO(-H)
Installation Manual
3.0 MECHANICAL INSTALLATION
Installation must be completed by competent persons, in accordance
with good industry practice and should conform to all governing and
statutory bodies i.e. IEE, CIBSE, etc.
Please note sufficient access and clear working space around the
unit is required to allow access for commissioning and also future
maintenance of key components. Please allow for the entire access
moulding and control cover to be removed, a minimum of 100mm
from the cover is required (Figure 1). An additional 20mm will be
required at the mains cable entry point to allow cable routing.
The unit is designed to be installed predominantly on a ceiling/
slab or floor mounted, the unit is only rated as IPX4 in these two
orientations. If installing in an alternative orientation the unit
must be situated in a dry environment that avoids dripping water
and must be mounted level in all axis.
The unit must be installed indoors, on a suitable surface 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 points (fixings
supplied by others) provided (Figure 1).
3.1 Ducting
To ensure a safe final installation all duct connections to the
unit must use rigid ducting with a minimum length of 500mm
and securely held in place by Nuaire specified duct sealant and
aluminium duct tape, Nuaire product codes PVCDSEAL and
PVC50TP45 respectively. If ducting is not fitted to any of the three
available inlets the blanking cap (figure 3) should be removed and
sealed with PVCDSEAL only as per the ducting instruction above.
Failure to seal the unit correctly may lead to reduced unit performance and
energy efficiency.
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 a minimum grade of ISO Coarse.
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
>0.625m
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K/w, in order to prevent condensation on the exterior of the duct to
the unit.
A minimum distance of 200mm between the appliance and any bends in
ductwork is recommended.
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, potentially affecting
the performance and reliability of the fan.
Whilst the property is drying out, very high moisture levels are likely to
occur. Therefore it is advisable that if 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 the natural migration of warm air.
IMPORTANT
Any air intake terminal MUST be installed in accordance with
the appropriate regulation.
As a guide, the BS5440 series of British Standards deals with
this issue and currently states that an air intake must be at a
minimum distance of 300mm from a gas boiler balance flue.
Installers are advised to be aware of the requirements of this
standard when installing 'through the wall' supply air ducting.
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4
Sealing Ducting to Unit
Removable Blanking Caps
Typical Ceiling Installation Duct Arrangement
