Unit must not be switched off during normal operation, the
product is designed to run continuously.
Nuaire Limited
Western Industrial Estate Caerphilly United Kingdom CF83 1NA
T: 029 2085 8400 F: 029 2085 8444 E: [email protected] W: www.nuaire.co.uk
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. Leaflet Number 671500
MRXBOX95B-LH1/LH2
Mechanical Ventilation Unit with Heat Recovery
& Summer Bypass for Loft Mounting
Installation and Maintenance
Spigot 2.
Spigot 1.
Spigot 3.
Spigot 4.
21.5mm Condensate drain
outlet. Optional either side.
M20 & M16 Cable
Glands. Mains entry
and Blanking Gland.
Controls
Figure 1. Airflow through unit.
The EMC Directive
2004/108/EC
The Low Voltage
Directive
2006/95/EC
Two fixing brackets
should be attached
on the non-control
end of the unit via
the two lower hole
positions.
(see figure 2c).
Two fixing brackets
should be attached
on the control end of
the unit via the two
upper hole positions.
(see figure 2c).
Figure 2a. Mounting MRXBOX95B-LH1/LH2 onto roof joists using
the ‘L’ shaped fixing brackets and AV mounts with four suitable
screws on the long side of the unit.
Spigot Location and Ducting references:
Spigot 1.
Extract air from kitchen/
bathroom.
Spigot 2.
Intake air from outside.
Spigot 3.
Outside air to house.
Spigot 4.
Extract air to outside.
1.0 Introduction
MRXBOX95B-LH1/LH2 is designed to provide mechanical
supply and extract ventilation with heat recovery and
incorporates summer bypass.
The unit has the facility to commission the supply and extract
fans independently on minimum speed (continuous background
ventilation), boost control will control both fans to the same
volume.
To recover heat from the extract air the heat exchanger block
is utilised. This heat exchanger can recover up to 95% of the
normally wasted heat.
The bypass damper opens when a 230V switch signal is
applied to the unit (via a manual switch). This opens the
damper via a wax 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 being filtered,
so the air quality is optimal, irrespective of the bypass setting
(Open or closed).
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.
The fan must be installed indoors, away from direct sources of
frost, heat, water spray or moisture generation.
The unit is designed for mounting on the roof joists in the loft
space using four “L shape” metal brackets and four A.V.
mounts supplied with the unit. Please note that various
positions for the brackets are available to suit different joist
centres.
Connect the four ‘L’ shape fixing brackets to the unit with the
M4 screws (provided) they can be attached to the long, or
short sides of the unit depending on requirements. Each pair of
brackets should be mounted at different heights so the fall is
towards the drip tray end of the unit. (see figures 2a, 2b and
2c for fixing details). Lower the unit with the “L” shape fixing
brackets attached onto the joists. Mark through the brackets
and drill four clearance holes into the top surface of joists.
Locate anti-vibration mounts (supplied) above and below each
bracket fixing point hole and, using 4 suitable screws (not
provided) and washers, fix the unit to the joists (see fig 2b).
Do not overtighten the fixings. The distance from the top
washer on the A.V. mount to the joist when installed must
not be less than 30mm.
