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
E: info@nuaire.co.uk W: www.nuaire.co.uk
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1.0 Introduction
The Nuaire MRXBOX90L (Large) heat recovery unit has an efficiency
of 90% and energy saving constant volume fan. 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 Function components
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 230V cable.
7.
Open Therm connection two pole connector for Open Therm control.
8. Option pcb between user and control electronics.
9. Inlet fan feeds fresh air into the dwelling.
10. Basic pcb contains the control electronics for the basic functions.
11. Computer port for service connection purposes.
12. Control panel interface between user and electronic control.
13. Outlet fan discharges used air from the dwelling to the atmosphere.
14. Duct spigots connections for the inlet and outlet ducts.
15. Connection condensate discharge.
Leaflet Number 611272 January 2012
MRXBOX90L
Mechanical Ventilation with Heat Recovery
Installation and Maintenance
1.2 Specification
Figure 1. Exploded view of unit
MRXBOX90L
Supply Voltage
230V~50Hz
Protection Rating
IP 32
Dimensions (W x H x D)
675 x 602 x 535mm
Duct diameter
180mm
External diameter condensate discharge
20mm
Mass kg (excluding bypass unit of 3.5kg)
32kg
Filter class
G4*
Ventilation capacity setting 1,
Factory setting 100 m
3
/h
Ventilation capacity setting 2,
Factory setting 200 m
3
/h
Ventilation capacity setting 3,
Factory setting 300 m
3
/h
Permissible resistance duct system
150 pa at 300 m
3
/h
*Filters supplied to be replaced post commisioning.
The EMC Directive
2004/108/EC
The Low Voltage
Directive
2006/95/EC
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