NuAire MRXBOXAB-ECO4 Installation Manual Download Page 1

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15. 03. 21. Document Number  671857

Nuaire | 

Western Industrial Estate 

Caerphilly 

CF83 1NA 

|

 

nuaire.co.uk

MRXBOXAB-ECO4 (Standard Hand Unit)

MRXBOXAB-ECO4-OH (Opposite Hand Unit)

Mechanical Ventilation Units with Heat Recovery for Wall Mounting 

Installation Manual

1.0 SAFETY INFORMATION

• 

The provision of the electrical supply and the connection of the unit to the mains must be 
carried out by a qualified electrician.

• 

Isolate from power supply before removing any covers. During installation / maintenance ensure 
all covers are fitted before switching on the mains supply. 

• 

All-pole disconnection from the mains as shown in the wiring diagram must be incorporated 
within the fixed wiring and shall have a minimum contact separation of 3mm in accordance with 
latest edition of the wiring regulations.

• 

This unit must be earthed.

• 

Ducting must be securely fixed with screws to the spigot to prevent access to live parts. Duct 
runs terminating close to the fan must be adequately protected by suitable guards.

• 

If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or 
similarly qualified persons in order to avoid a hazard.

• 

Precautions must be taken to avoid the back-flow of gases into the room from the open flue of 
gas or other fuel-burning appliances.

• 

This appliance should not be used by children or persons with reduced physical, sensory or 
mental capabilities or lack of experience and knowledge, unless they have been given supervision 
or instruction concerning the safe use of the appliance by a person responsible for their safety. 
Children shall not play with the appliance. Cleaning and user maintenance shall not be carried 
out by children.

1.1 Hazard Symbols

  

REFER TO INSTRUCTION MANUAL

 

 

 

Read and understand the installation and maintenance manual before installing,    

 

 

operating or maintaining this product.

1.2 Important Information

This manual contains important information on the safe and 
appropriate assembly, transport, commissioning, operation, 
maintenance, disassembly and simple troubleshooting of the product.

While the product has been manufactured according to the accepted 
rules of current technology, there is still a danger of personal injury or 
damage to equipment if the following general safety instructions and 
the warnings contained in these instructions are not complied with.

Read these instructions completely and thoroughly before 
working with the product.

Keep these instructions in a location where they are accessible 
to all users at all times.

Always include the operating instructions when you pass the 
product on to third parties.

1.3 Personal Protective Equipment

The following minimum Personal Protective Equipment (PPE) is 
recommended when interacting with Nuaire product:

Protective Steel Toed Shoes - 

when handling heavy objects.

 

Full Finger Gloves (Marigold PU800 or equivalent) - 

when 

handling sheet metal components. 

Semi Fingerless Gloves (Marigold PU3000 3DO or equivalent) 

- when conducting light work on the unit requiring tactile 
dexterity. 

Safety Glasses

 - when conducting any cleaning/cutting operation 

or exchanging filters. 

Reusable Half Mask Respirators 

- when replacing filters which 

have been in contact with normal room or environmental air.

Nuaire would always recommend a site specific risk assessment by a 
competent person to determine if any additional PPE is required. 

Summary of Contents for MRXBOXAB-ECO4

Page 1: ...dren shall not play with the appliance Cleaning and user maintenance shall not be carried out by children 1 1 Hazard Symbols REFER TO INSTRUCTION MANUAL Read and understand the installation and maintenance manual before installing operating or maintaining this product 1 2 Important Information This manual contains important information on the safe and appropriate assembly transport commissioning o...

Page 2: ...and use the wall mounted bracket to mount the unit on Figure 5 2 0 INTRODUCTION The ECO4 wall mounted units are designed to provide mechanical supply and extract ventilation with heat recovery and an integral automatic HX bypass The units also incorporate an integral humidistat and frost protection To recover heat from the extract air the heat exchanger block is utilised The heat exchanger can rec...

Page 3: ...Piece to connect the CONTRAP drainage and the MVHR drain pipework the MVHR drain must always be fitted before the T Piece to prevent condensate from feeding back into the MVHR system 3 4 Extract Input Areas The unit is designed to extract air from all wet rooms e g bathroom kitchen en suite utility room with sink WC s do not need to be ventilated if openable windows are fitted Supply air should be...

Page 4: ...ere the design air permeability is intended to be more than 5m3 h m2 50 Pa allow for infiltration for all dwelling types by subtracting from the whole dwelling ventilation supply rate from Whole Dwelling Ventilation Rates table 0 04 x gross internal volume of the dwelling heated space m3 Step 2 Calculate the whole dwelling extract ventilation rate by summing the individual room rates for minimum h...

Page 5: ...5 710 710 585 Ecosmart connection 4 x Spigots 180mm Internal Diameter 200mm External Diameter View from top Side view Front view 18 Mounting Bracket AB AB 200 176 534 67 492 CRS 67 40 0 CRS 5 Fixing Points be fitted to Bracket to Volt Free Cable Exit Point Main Cable Exit Point the wall 40 0 CRS 86 0 Front view Side view 86 0 15 0 23 0 Flush mounting face to wall or back box 25 25 11 Fixing Point ...

Page 6: ...Valve mounted unit Nuaire wall MVHR DRAIN Condensate drain uninsulated drain pipe with min 5o fall running to SVP Insulated extract duct 3 9 2 Rectangular Ducting 13 Typical Rectangular Ducting Arrangement For Wall Mounted Units Exhaust air from kitchen bathroom to outside via air brick Minimum distance as specified in building regulations Intake air from outside via air brick All duct between MVH...

Page 7: ...5 Amp This unit must be earthed The cable from the mains power supply should be connected to a fixed wiring installation via a fused isolator in accordance with current IEE wiring regulations 4 2 Wiring Diagrams 4 2 1 Unit Only 14 Wiring Diagram Unit Only MAINS 230V 50Hz N L 3 Position Switch Ancillary code MRXBOX95 3SWITCH Blue Green yellow Brown Black Supply cord from unit Grey L 1 2 5A Fuse BS1...

Page 8: ...iated A calibrated moving vane anemometer and hood will be required to carry out commissioning Adjustment valves should be locked in place to prevent further adjustment Once commissioned the home owner tenant should be informed that the unit should not be adjusted as it will have a detrimental effect on the indoor air quality and could result in condensation and mould growth The clear panel coveri...

Page 9: ... reserved to make such changes without prior notice 6 4 Frost Protection In the event of the intake air temperature at the unit dropping below the predetermined set point 5 C as standard the supply fan will reduce to minimum speed once the temperature rises above the set point the fan will return to its commissioned speed Frost protection will only activate after ten days of continuous run time If...

Page 10: ...10 15 03 21 Document Number 671857 Nuaire Western Industrial Estate Caerphilly CF83 1NA nuaire co uk MRXBOXAB ECO4 Installation Manual NOTES ...

Page 11: ...11 15 03 21 Document Number 671857 Nuaire Western Industrial Estate Caerphilly CF83 1NA nuaire co uk MRXBOXAB ECO4 Installation Manual NOTES ...

Page 12: ...12 15 03 21 Document Number 671857 Nuaire Western Industrial Estate Caerphilly CF83 1NA nuaire co uk MRXBOXAB ECO4 Installation Manual NOTES ...

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