1.0 Introduction
The Nuaire MRXBOX90S is a heat recovery unit with an efficiency
of 90% and energy saving constant volume fans. The unit is supplied
ready for use.
The unit has the following functions:
• steplessly adjustable air flow rates through a control panel
• filter indication on the unit
• frost protection system that ensures optimum performance of
the unit, even at very low atmospheric temperatures
• the unit comes ready for use
• all control equipment has been mounted and checked in the
factory
• on installation, the appliance must be connected to the air
ducts, the condensate discharge, the mains supply and the
multiple switch
• the installer can change the desired air flow for every setting
with the aid of the control panel on the unit
1.1 Specification
Supply Voltage 230V~50Hz
Protection Rating IP 31
Dimensions (WxHxD) 560x600x315mm
Duct diameter 125mm
External diameter condensate discharge 20mm
Mass 25 kg
Filter class G4*
Ventilation capacity setting 1, Factory setting 75 m
3
/h
Ventilation capacity setting 2, Factory setting 100 m
3
/h
Ventilation capacity setting 3, Factory setting 150 m
3
/h
Permissible resistance duct system 150 pa at 180 m
3
/h
* Filters supplied to be replaced post commissioning.
Coding: MRXBOX90S
1.2 Function components
1. Duct spigots. Connections for the input and output ducts.
2. Interior temperature sensor measures the temperature of the air
from the dwelling.
3 Heat exchanger ensures heat transfer between inlet and outlet air.
4. Filters filter both air flows.
5. Atmospheric temperature sensor measures outside air temperature.
6. Communication connection port for cable to multiple switch.
7. Plate fitted with swivel for feeding through power cable.
8. OpenTherm connection. Two pole screw connector for control.
9. Inlet fan feeds fresh air into the dwelling.
10. Basic pcb contains the control electronics for the basic functions.
11. Outlet fan discharges fouled air from the dwelling to the
atmosphere.
12. Computer port connection for service purposes.
13. Control panel Interface between user and control electronics.
14. Connection condensate discharge.
1
Leaflet Number 611273 July 2011
MRXBOX90S
Mechanical Ventilation with Heat Recovery
Installation and Maintenance
Before commencing work, please read this
installation guide throughout in conjunction
with the appropriate illustrations.
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Figure 1. Exploded view of unit
Nuaire 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
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The EMC Directive
2004/108/EC
The Low Voltage
directive
2006/95/EC
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