Nuaire Group MRXBOX95B-WMI Installation And Maintenance Manual

1.0 Introduction
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.
MRXBOX95B-WM1 wall mounted unit is designed to provide
mechanical supply and extract ventilation with heat recovery
& incorporates integral frost protection and summer bypass.
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.
The bypass damper opens when a 230V signal is applied to
the unit (via a manual switch, supplied). This opens the damper
via an actuator. When the switch signal is de-activated
the unit returns to its original state (air through the heat
exchanger).
Outside air supplied through the bypass is still filtered, so the
air quality is optimal, irrespective of the bypass setting (Open
or closed).
Figure 1. Airflow through unit.
Exhaust air
from house
to outside
Extrac t
Fan Supply
Fan
Run on
Trickle
Boost Trickle
Boost
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 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 350mm in front of the unit.
Nuaire Limited Western Industrial Estate Caerphilly United Kingdom CF83 1NA
T: 029 2085 8400 F: 029 2085 8444 E: info@nuaire.co.uk W: www.nuaire.co.uk
MRXBOX95B-WM1
Mechanical Ventilation Unit with Heat Recovery,
Integral Frost Protection & Summer Bypass
Installation and Maintenance
Intake air
from outside
Supply air
to house
Extract air
from house
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 solid wall.
The unit is designed for wall mounting only via a patress.
1. One part of the mounting bracket 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), ensuring the interlock side
is at the top, fig. 2.
2. Fix the remaining part of the bracket to the unit using the
M5 screws ensuring the interlock side is at the bottom, fig.3a.
3. Install the unit on the wall by ensuring the bracket on the
unit interlocks over the wall mounted bracket (fig. 3b).
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.
Figure 2. Fixing the mounting bracket to the wall via a patress.
Figure 3a. Fixing the mounting
bracket to the rear of unit.
Bracket
Pre-fitted
support feet
Figure 4. Typical example of a cupboard mounted unit on a patress
using the bracket.
125mm dia.
ducting in
ceiling void.
First floor ceiling.
1
The EMC Directive
2004/108/EC
The Low Voltage
Directive
2006/95/EC
Figure 3b. Mounting the unit
on the wall mounted bracket.
Supply air valve in ceiling.
Side view of unit mounted
on the wall in a cupboard.
(Note: The unit must be
fixed to a suitable patress
in upright position as
shown to comply with
safety regulations).
MVHR-DRAIN
Condensate drain,
uninsulated drain
pipe with 10 o fall
running to SVP.
11. 09. 14. Leaflet Number 671631