2
28. 07. 21. Document Number 671856
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
MRXBOXAB-ECO(3/5)-(SC/SW)
Installation Manual
2.0 INTRODUCTION
The ECO(3/5) wall mounted range of units is designed to provide
mechanical supply and extract ventilation with heat recovery.
The unit is fitted with two independent fans. Each fan has full speed
control for background and boost ventilation rates. To recover heat
from the extract air the heat exchanger block is utilised. The heat
exchanger can recover up to 95% of the normally wasted heat. Bypass
operation can be disabled via a manual switch in colder months so the
unit recovers heat continually.
3.0 MECHANICAL INSTALLATION
Installation must be carried out by competent personnel in accordance
with the appropriate authority and conforming to all statutory
governing regulations. All mains wiring must be in accordance with the
current I.E.E. Regulations, or the appropriate standards. Ensure that the
mains supply (Voltage, Frequency and Phase) complies with the rating
label.
Please note a clear working space is required around the installed unit
to allow the cover to be removed and provide sufficient access for
maintenance such as filter change.
Please allow a minimum of 360mm in front of an
MRXBOXAB-ECO(3/5) unit.
The fan must be installed indoors, on a suitable wall 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 wall.
The unit must remain switched on at all times to maintain
ventilation within the dwelling. Turning the unit off will cause long
term damage to the unit and building fabric.
1
Airflow Through unit (Standard Unit)
Extract air
from house
Intake air
Exhaust air
from outside
to outside
from house
to house
Supply air
Intake air
from outside
Extract air
from house
Supply air
to house
Exhaust air
from house
to outside
2
Airflow Through OH unit (Opposite Hand Unit)
Extract air
from house
Intake air
Exhaust air
from outside
to outside
from house
to house
Supply air
Intake air
from outside
Extract air
from house
Supply air
to house
Exhaust air
from house
to outside
3.1 Wall Mounting
If fitting the MVHR in conjunction with a MRXBOX-AV(3/5) the
hanging brackets supplied with the MVHR are redundant and
should not be used. The installation instructions supplied with
MRXBOX-AV(3/5) should be followed.
The unit is designed for wall mounting, only on a solid wall. A
gypsum block or stud/plasterboard wall will not suffice.
1. One part of the mounting bracket (supplied) should be offered up
to the wall, ensuring it’s located horizontally. Mark the fixing points
through the pre drilled holes in the bracket and install with screws
(by others), whilst ensuring the interlock side is at the top (Figure 3).
2. Install the unit on the wall by ensuring the bracket fixed to the rear
of the unit interlocks over the wall mounted bracket (Figure 4).
Care must be taken to ensure the unit is installed true in all 3
dimensions. Failure to do so may result in overflow from the
internal condensation drip tray.
3
Wall Mounting Bracket
4
Mounting Unit Onto Bracket
3.1.1 Option 1 - Solid Wall
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.
MVHR-DRAIN
Condensate drain,
uninsulated drain
pipe with min 5
o
fall running to SVP.
Valve in ceiling.
5
Solid Wall Mounted Unit Installation
