NuAire mrXbox90L Installation And Maintenance Manual

1.0 Introduction
The Nuaire mrXbox90L is a heat recovery unit with an efficiency
of 90% and energy saving constant volume fans. The unit is supplied
with a nearly 100% bypass, which can be used to interrupt the heat
recovery, if desired, to supplied fresh, cool outside air. The heat
exchanger is equipped with a sliding grate that shuts off the airflow
through the exchanger.
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
Protection Rating
Dimensions (WxHxD)
Duct diameter
External diameter condensate discharge 20mm
Mass
Filter class
Ventilation capacity setting 1, Factory setting 100 m
Ventilation capacity setting 2, Factory setting 200 m
Ventilation capacity setting 3, Factory setting 300 m
Permissible resistance duct system 150 pa at 400 m
*Filters supplied to be replaced post commisioning.
Coding: mrXbox90L
Before commencing work, please read this
installation guide throughout in conjunction
with the appropriate illustrations.
Nuaire Limited Western Industrial Estate Caerphilly United Kingdom CF83 1NA T: 029 2088 5911 F: 029 2088 7033
mrXbox90L
Mechanical Ventilation with Heat Recovery
Installation and Maintenance
230V~50Hz
IP 32
675x602x430mm
180mm
35 kg
G4*
3
/h
3
/h
3
/h
3
/h
E: info@nuaire.co.uk W: www.nuaire.co.uk
1.2 Function components
Figure 1. Exploded view of unit
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1 Interior temperature sensor measures the temperature of the air
from the dwelling.
2 Heat exchanger ensures heat transfer between inlet and outlet air.
3 Filters filter both air flows.
4 Atmospheric temperature sensor measures outside air temperature.
5 Communication connection port for cable to multiple switch.
6 Swivel plate fitted with swivels for feeding through various cables.
7 Inlet fan feeds fresh air into the dwelling.
8 Basic pcb contains the control electronics for the basic functions.
9 Computer port connection for service purposes.
10 Control panel Interface between user and control electronics.
11 Motor Control Unit inlet fan arranges communication between
basic pcb and outlet fan.
12 Outlet fan discharges fouled air from the dwelling to the
atmosphere.
13 Motor Control Unit outlet fan arranges communication between
basic pcb and outlet fan.
14 Duct spigots connections for the inlet and outlet ducts.
15 Connection condensate discharge.
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Leaflet Number 671367 July 2007
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