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28. 07. 21. Document Number 671856
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
MRXBOXAB-ECO(3/5)-(SC/SW)
Installation Manual
3.1.2 Option 2 - Non-Solid Wall
If it is not practical to use a solid wall, the MVHR unit should be
fixed to a stud partition with a 25mm minimum thickness MDF
panel solidly fixed behind the plasterboard.
If fixing to a stud wall the MDF panel should extend, width wise, over a
minimum of 3 vertical studs with centres of no more than 400mm. Add
additional vertical supports if necessary.
Height wise, ideally, the MDF panel should extend from floor to ceiling
but as a minimum should be a least 2m high.
Fix the mounting bracket to the wall (Figure 3) and use the wall
mounted bracket to mount the unit on (Figure 4).
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Non-Solid Wall Mounted Unit Installation
Ducting in the
ceiling void.
mounted in a
Side view of unit
a stud partition
cupboard fixed to
with the 25mm
MDF fixed behind
MVHR-DRAIN
the plasterboard.
Condensate drain,
uninsulated drain
pipe with min 5
o
fall running to SVP.
Valve in ceiling.
3.2 Loft Mounting
3.2.1 Option 1 - Tank Stand
The MVHR unit should be positioned on a tank stand using the
Anti-vibration tray assembly discarding the angle brackets.
Anti-vibration tray assembly (MRXBOX-AV(3/5)) is to be purchased
separately.
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Tank Stand Loft Mounted Unit Installation
3.2.2 Option 2 - Angled Brackets
The MVHR unit should be positioned on a 25mm minimum
thickness MDF panel that is vertically fixed across the roof trusses
to form a solid false wall.
Add additional vertical supports if necessary. Use the Anti-vibration
tray assembly (MRXBOX-AV(3/5)) including the angle brackets, to be
purchased separately.
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Angled Brackets Loft Mounted Installation
3.3 Off-Site Cupboard Construction
For off-site constructed cupboards adequate support must be included
in the steel frame to support the weight of the units in operation and to
allow for dynamic loads in transit to site.
If the unit is to be bolted to a plywood or MDF backboard then this
must be of sufficient thickness to support the unit’s weight and
through-bolted with washers fitted to spread the load.
The cupboard manufacturer should satisfy themselves that the method
of mounting is sufficient to support the weight of the unit in operation
and transit to site.
The top of the unit is to be suitably braced within the cupboard for
transport.
3.4 Condensate Drain
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 Ø 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.
An MVHR-DRAIN is recommended for use as the primary
condensate take-off (Figures 10 and 11).
