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.
Installation and Maintenance
MRXBOX95-WM2-AE (Standard Unit)
MRXBOX95-WM2-AE-OH (Opposite hand Unit)
MRXBOX95AB-WM2-AE (Standard Unit)
MRXBOX95AB-WM2-AE-OH (Opposite hand Unit)
Mechanical Ventilation Units with Heat Recovery for Wall Mounting
1
27. 11. 17. Leaflet Number 671733
Figure 1. Airflow through unit (Standard unit).
Figure 2. Airflow through OH unit (Opposite hand unit).
Intake air
from outside
Extract air
from house
Supply air
to house
Exhaust air
from house
to outside
Extract air
from house
Intake air
from outside
Exhaust air
from house
to outside
Supply air
to house
Spigot fixing plate
Transportation fixings
1.0 Introduction
The WM2-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.
2.0 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 unit.
The fan must be installed indoors, on a suitable wall away from direct
sources of frost, heat, water spray or moisture generation.
For a vibration-free result the unit must be mounted to a non-
reverberant wall.
2.1 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 (fig.3). These must be removed before use, fail-
ure to do so will result in excessive vibration and noise. The screws
removed can be discarded and replaced with rubber caps provided.
Figure 3. Securing fixings.
2.2 Wall Mounting the MVHR Unit
The unit is designed for wall mounting only on a solid wall, 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 fig.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.
Figure 4. Dimensions for fitting wall brackets.
Note: 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.
25
25
656 crs
9.1 dia.
30
94
94
33
The EMC Directive
20
1
4/
30
/E
U
The Low Voltage
Directive
20
14
/
1
5/E
U
Nuaire: A Trading Division of Polypipe Limited
Western Industrial Estate
Caerphilly United Kingdom CF83 1NA
T: 029 2088 5911 F: 029 2088 7033 E: info@nuaire.co.uk W: www.nuaire.co.uk
