2
27. 11. 17. Leaflet Number 671733
Installation and Maintenance
The WM2 Wall Mounted Range of Units
2.2 Wall Mounting cont. Option 1:
The unit fixed to a solid wall construction using the
mounting bracket provided.
Figure 5. Typical example of a cupboard mounted unit (Standard unit)
fixed to a block work wall.
Wall Mounting Option 2:
If it is not practical to use a solid wall, the unit should
be fixed to a stud partition with a 25mm minimum
thickness MDF panel solidly fixed behind the plaster-
board.
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.
A vertical stud should be located to correspond with the position
each mounting bracket is to be fixed to provide additional support.
Add additional vertical supports if necessary. Height wise, the MDF
panel should extend from floor to ceiling.
Fix the mounting bracket to the wall (as fig 4) and use the wall
mounted bracket to mount the unit on (as shown in fig 5).
Figure 6. Typical example of a cupboard mounted unit (Standard unit)
fixed to a stud partition with the MDF panel fixed behind the plaster-
board.
2.3 Condensate Drain
The MVHR unit inside the enclosure is fitted with a straight coupling
to allow 21.5mm overflow pipe (not supplied) to be attached using
solvent cement, the pipe should be passed through the flexible
adhesive backed cover plate before the solvent cement is applied.
The pipe can then be inserted into the coupling of the MVHR unit
and the cover plate slid along the length to bond against the base
panel of the enclosure preventing noise breakout. (fig. 7).
Figure 7.
1. The condensate must be discharged under a water level in a U-trap
drainpipe or an alternative drain method which acts as an airlock.
2. If using a U-trap please ensure the U-trap has been filled to a
suitable level of water to avoid any air locks.
3. If the condensation pipe is fitted in an unheated space the pipe
should be in insulated to prevent freezing.
Nuaire recommend MVHR-DRAIN be used as the primary
condensate take-off. (see figure 8b and 8C.
Solvent cement to be applied
Flexible adhesive backed
cover plate
Overflow pipe
Figure 8a. Wet option.
Condensate pipe
connection to unit and
a typical example of
a “U” trap drainpipe.
(Standard configuration
only).
Figure 8b. MVHR-DRAIN option.
Condensate drain, uninsulated drain
pipe with min 5
o
fall running to SVP.
Min 5
o Drop
Collar
To SVP
“T” piece
MVHR Drain
To unit
To CONTRAP
Figure 8c.
IMPORTANT: When using a “T” Piece to connect the CONTRAP
drainage and the MVHR drain pipework the MVHR drain must always be
fitted before the “T” Piece to prevent condensate from feeding back into
the MVHR system.
Ducting in the
ceiling void.
Side view of unit
mounted on the
block wall in a
cupboard using
the wall brackets.
MVHR-DRAIN
Condensate drain,
uninsulated drain
pipe with min 5
o
fall
running to SVP.
Valve in ceiling.
Ducting in the
ceiling void.
Side view of unit
mounted in a
cupboard fixed to
a stud partition
with the 25mm
MDF fixed behind
the plasterboard
using the wall
brackets.
MVHR-DRAIN
Condensate drain,
uninsulated drain
pipe with min 5
o
fall
running to SVP.
Valve in ceiling.
Unit weight
= 45kG
Unit weight
= 45kG
