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-LP1 (Standard Unit)
MRXBOX95B-LP1-OH (Opposite Hand Unit)
Mechanical Ventilation Unit with Heat Recovery
& Summer Bypass for Ceiling Void Mounting
Installation and Maintenance
1.0 Introduction
The LP1 ceiling void mounted unit is designed to provide
mechanical supply and extract ventilation with heat recovery
and incorporates 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 80% of the
normally wasted heat.
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.
The unit is fitted with a frost protection mode, in the event of
the fresh air temperature dropping below -5 Deg C the supply
fan will switch off. The unit will then automatically switch back
on when the temperature raises back above -5 Deg C.
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, in a suitable ceiling void
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 surface in the void.
The unit is designed for ceiling mounting only (Horizontal
surface).
1. The unit is supplied with a steel mounting bracket.
2. Position & secure the steel bracket to the ceiling using
appropriate fixings (supplied by others), ensuring that the
two outer fixing holes on the unit are accessible (see fig 2).
Note: The mounting bracket should be on the same side as the
condensate take off.
3. The unit can now be offered into position & located into the
mounting bracket.
4. Using appropriate fixings (supplied by others), fix the unit to
the ceiling. It is recommended that the unit is fixed through
three holes on the non-bracket side and the two outer holes on
the bracket side.
Note: The unit must be installed in an upright position as
shown for the condensate drain and for compliance with safety
regulations relating to IP protection for water drip ingress.
1
27. 11. 17. Leaflet Number 671582
Spigot 1.
Spigot 4.
Spigot 3.
Spigot 2.
Figure 1a. Airflow through unit (Standard unit).
Spigots 1 to 4
1. Intake air (Fresh Air from outside).
2. Supply Air (Supply in to house).
3. Extract Air (Warm air from house).
4. Exhaust Air (Waste air to outside).
Figure 1b. Airflow through OH unit (Opposite hand unit).
Spigots 1 to 4
1. Intake air (Fresh Air from outside).
2. Supply Air (Supply in to house).
3. Extract Air (Warm air from house).
4. Exhaust Air (Waste air to outside).
Spigot 3.
Spigot 2.
Spigot 1.
Spigot 4.
The EMC Directive
2014/30/EU
The Low Voltage
Directive
2014/35/EU
Nuaire: A Trading Division of Polypipe Limited
Western Industrial Estate
Caerphilly United Kingdom CF83 1NA
T: 029 2088 5911 F: 029 2088 7033 E: [email protected] W: www.nuaire.co.uk
