3
07. 09. 21. Document Number 671822
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
MRXBOX(AB)-ECO2-1Z
Installation Manual
3.3 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 (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. This condensate discharge connection is suitable for 21.5mm dia.
overflow pipe. Solvent cement should be used to make the joint.
3. If using a U-trap please ensure the U-trap has been filled to a
suitable level of water to avoid any air locks.
4. 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 (Figures 9 and 10).
7
Wall Bracket Dimensions
Solvent cement to be applied
Flexible adhesive backed
cover plate
Overflow pipe
Min 5
o
Drop
8
Condensate Drain - Wet Connection: Unit Pipe Connection To
Typical “U” Trap Drainpipe Example
Collar
9
Condensate Drain - MVHR-DRAIN: Condensate Drain,
Uninsulated Drain Pipe With Min 5° Fall Running To SVP.
3.2.1 Solid Wall Mounting (Recommended)
The MVHR unit fixed to a solid wall construction using the
mounting bracket provided.
Ducting in the
ceiling void.
Side view of unit
mounted on the
block wall in a
cupboard using
MVHR-DRAIN
the wall brackets.
Condensate drain,
uninsulated drain
pipe with min 5
o
fall
running to SVP.
Valve in ceiling.
Unit weight
= 58kG
5
Cupboard Mounted Unit Fixed to Block Work Wall Example
3.2.2 Stud Partition Wall Mounting (Alternative)
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 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.
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 (Figure 4) and use the wall
mounted bracket to mount the unit on (as shown in Figure 6).
6
Cupboard Mounted Unit Fixed to Stud Partition Wall Reinforced
With MDF Panel Example
Ducting in the
ceiling void.
Side view of unit
mounted in a
with the 25mm
cupboard fixed to
a stud partition
MDF fixed behind
the plasterboard
using the wall
MVHR-DRAIN
brackets.
Condensate drain,
uninsulated drain
pipe with min 5
o
fall
running to SVP.
Valve in ceiling.
Unit weight
= 58kG
