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nuaire.co.uk
029 2085 8400
04. 09. 19. Leaflet Number 671789
Installation and Maintenance
Student Accommodation Ventilation Unit
5.1 Condensate Drain
Units come complete with external drain pipe (21.5mm waste pipe) at the
front of the unit. Use conventional plumbing connections to link up with U-trap
or alternative drain method (Solvent cement connections or compression fit
connections are recommended). The condensate must be discharged under a
water level in a U-trap drainpipe or an alternative drain method which acts as an
airlock.
This condensate discharge connection is suitable for 21.5mm diameter overflow
pipe. Solvent cement should be used to make the joint.
If using a U-trap please ensure the U-trap has been filled to a suitable level of
water to avoid any air locks.
If the condensation pipe is fitted in an unheated space the pipe should be in
insulated to prevent freezing.
Ensure that the condensate drain pipe has a minimum 5° fall running to SVP.
Nuaire recommend MVHR-DRAIN be used as the primary condensate take-
off.
Supply air to
lounge via
in ceilings.
Air Valve
Extract air from
kitchen via
in ceilings.
Air Valve
Supply air to
bedrooms via
in ceilings.
MVHR-DRAIN
Air Valve
condensate drain,
with min 5° fall running
to SVP (obscured by unit).
Nuaire ceiling void
mounted unit.
Extract air from
bathroom via
in ceilings.
Air Valve
Exhaust air from
kitchen/bathroom to
outside via air brick.
Supply and extract
ducts from external
air bricks to the unit
needs to be insulated.
Top of ceiling void.
Minimum distance as
specified in Building
Regulations.
Intake air from
outside via air brick.
Figure 1. MVHR-DRAIN correct installation
5.1.1 MVHR-DRAIN Installation
Offer up the MVHR-DRAIN inlet to the threaded tail of the appliance waste
outlet or MVHR-DRAIN knuckle or running adaptor, and tighten the threaded
cap sufficiently hand-tight to provide a water-tight seal (check that the cap
screws on square and does not ‘cross-thread’). When the screwed cap is tight,
the MVHR-DRAIN body is secure.
1. Cut the pipe to length, allowing for the full compression socket depth (using
an appropriate pipe cutter, such as a Hepworth ratchet pipe cutter).
2. Remove any ‘swarf’ from the end of the plastic pipe. Ream the copper pipe
end to remove any ‘burr’, and file if necessary to remove any external sharp
edges. Mark the socket depth on the pipe, and check that the pipe section to
be jointed is free of any surface damage which may affect the joint seal.
3. Unscrew the cap from the MVHR-DRAIN outlet, and slide the cap and rubber
seal onto the pipe.
4. Insert the pipe end fully into the socket.
5. Slide the rubber seal and screwed cap up against the face of the socket, and
tighten the cap sufficiently hand-tight (check that the cap is square to the
body and does not ‘cross thread’). Hand tight should be adequate to form a
proper seal.
5.2 Extract/Input Areas
The unit is designed to extract air from all wet rooms e.g. bathroom, kitchen,
en-suite, utility room (with sink). WC’s do not need to be ventilated if openable
windows are fitted.
Supply air should be to all habitable rooms e.g. bedrooms and lounge. Extract /
input grilles should be adjustable valve types (not supplied).
5.3 Ducting
It is recommended that rigid ducting should be used at 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.
To prevent condensation on the outside of the outside air inlet duct and the air
outlet duct from the UNI-X, these ducts should be insulated.
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 300mm between the appliance and any bends in
ductwork is recommended. 220 x 90mm rectangular ducting should be used
(see Figure 2 for further information).
Ducting joints must be sealed with non-hardening silicone type sealant and
needs to be taped with metallised tape. Ducting shall be adequately and reliably
fixed to the appliance.
CORRECT
INCORRECT
Flow
Side elevation
When installed horizontally the ribs must be at the bottom to
ensure correct operation.
Figure 2. Typical ducting arrangement.
