2
15. 12. 21. Document Number 671985
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
MRXBOXAB-ECO2B-AE(-D)
Installation Manual
2.0 INTRODUCTION
The ECO2-AE wall mounted range of units are designed to offer
improved sound levels and an aesthetically pleasing installation by
housing a Mechanical Ventilation with Heat Recovery unit (MVHR)
inside an acoustically lined enclosure.
The MVHR 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.
If the MVHR unit has integral automatic HX bypass (AB models
only),
the bypass damper shall open automatically via a wax actuator
allowing the air to bypass the heat exchanger to deliver fresh filtered air
during the warmer months.
Intake air
from outside
Extract air
from house
to house
Supply air
Exhaust air
from house
to outside
Extract air
from house
Intake air
Exhaust air
from outside
from house
to outside
Supply air
to house
1
Airflow Through Unit (Opposite Hand Unit)
Intake air
from outside
Extract air
from house
to house
Supply air
Exhaust air
from house
to outside
Extract air
from house
Intake air
Exhaust air
from outside
from house
to outside
Supply air
to house
2
Airflow Through Unit (Standard Hand Unit)
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.
This appliance is not intended for use by persons (including
children) with reduced physical, sensory or mental capabilities,
or lack of experience and knowledge, unless they have been given
supervision or instruction concerning the use of the appliance by a
person for their safety. Children should be supervised so that they
do not play with the appliance.
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 allow a minimum of 350mm in front of the enclosure.
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 non-
reverberant wall.
3.1 Transportation Fixings
To prevent damage during transportation the product is shipped
with securing fixings, these can be found front and centre of the
enclosure top panel (Figure 3). These must be removed before use,
failure to do so will result in excessive vibration and noise. The
screws removed can be discarded and replaced with rubber caps
provided.
Spigot fixing plate
Transportation fixings
3
Transportation Fixings
3.2 Wall Mounting
The unit is designed for wall mounting on a solid wall only, a gypsum
block/plasterboard wall will not suffice. Examples of suitable
installation are shown overleaf. The wall brackets supplied should be
secured to the wall using suitable fixings (supplied by others) as per
the dimensions given in Figure 4; the head of the chosen fixing should
protrude no more than 8mm from the wall bracket. The enclosure
assembly can then be lifted using suitable equipment and moved into
position so it is sitting directly on the wall brackets (ensuring the rear
panel of the enclosure is not in contact with the wall bracket fixings).
The enclosure can be secured to the wall brackets using the 4x M8
fixings supplied.
No part of enclosure should be in contact with the building structure,
the only components that should be in contact are the wall mounting
brackets.
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.
4
Wall Bracket Dimensions
25
25
656 crs
9.1 dia.
30
94
94
33
