NuAire MRXBOXAB-ECO4-SC User manual

1
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
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.
• This MRXBOX unit is fitted with surge protection. If RCD protection is used, a G or S type
RCD is recommended.
• 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.

2
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
The fan must be installed indoors, on a suitable wall away
from direct sources of frost, heat and water spray or moisture
generation. For a vibration-free result the unit must be mounted to
a solid wall.
The unit must remain switched on at all times to maintain
ventilation within the dwelling. Turning the unit o 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.
Care must be taken to ensure the unit is installed true in all 3
dimensions. Failure to do so may result in overflow from the
internal condensation drip tray.
If fitting the MVHR in conjuntion with a MRXBOX-SIL4 the unit
should be mounted using alternative brackets supplied under
part code MRXBOX-AV4, the standard wall brackets supplied
with the MVHR are not rated for the additional load.
•One part of the mounting bracket (supplied) should be
oered up to the wall, ensuring it’s located horizontally. Mark
the fixing points through the pre drilled holes in the bracket
and install with screws (by others), whilst ensuring the
interlock side is at the top (Figure 3).
•Install the unit on the wall by ensuring the bracket on the
unit interlocks over the wall mounted bracket (Figure 4).
Ensure the mains power cable does not become trapped
between the brackets during this process as this will
prevent engagement and potentially damage the electrical
insulation. The cable gland can be rotated through 90° to
assist this operation and subsequent cable routing.
3 Wall Mounting Bracket
3.1 Solid Wall Mounting
The MVHR unit fixed to a solid wall construction using a
suitable mounting structure (supplied by others).
Ducting in the
ceiling void.
Side view of unit
mounted on the
block wall in a
cupboard.
MVHR-DRAIN
Condensate drain,
uninsulated drain
pipe with min 5 o
fall running to SVP.
Valve in ceiling.
4 Solid Wall Mounted Unit Installation
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 MVHR unit is fitted with two independent fans to provide
mechanical supply and extract ventilation, 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 95% of the normally wasted
heat.
Bypass operation can be disabled via a manual switch in colder
months so the unit recovers heat continually.
2.1 Code Description
1 2 - 3 4
MRXBOXAB-ECO 4 - OH SC
1. Range: MRXBOXAB-ECO
2. Unit Size: 4 = Size 4 Unit
3. Unit Handing [none] = Standard Handing
OH = Opposite Handing
4. Speed Control Variant: SC = For use with inline cooling
module
SW = For use when no additional
cooling module is connected.
3.0 MECHANICAL INSTALLATION
Extract air
from house
Intake air
Exhaust air
from outside
to outside
from house
to house
Supply air
Extract air
from house
Intake air
Exhaust air
from outside
to outside
from house
to house
Supply air
1 Airflow Through unit (Standard Hand Unit)
Extract air
from house
Intake air
Exhaust air
from outside
to outside
from house
to house
Supply air
Extract air
from house
Intake air
Exhaust air
from outside
to outside
from house
to house
Supply air
2 Airflow Through OH unit (Opposite Hand Unit)
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.
A clear working space is required around the installed unit to
allow the cover to be removed and provide sucient access for
maintenance such as filter change. A minimum of 480mm is
required in front of the unit.

3
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
3.2 Non-Solid Wall Mounting
The unit is designed for wall mounting, only on a solid wall. A
gypsum block or stud/plasterboard wall will not suce.
If it is not practical to use a solid wall, the MVHR unit should
be fixed to a stud partition with a 25mm minimum thickness
MDF panel solidly fixed behind the plasterboard.
If fixing to a stud wall the MDF panel should extend, width wise,
over a minimum of 3 vertical studs with centres of no more than
400mm. Add additional vertical supports if necessary. Height
wise, ideally, the MDF panel should extend from floor to ceiling
but as a minimum should be a least 2m high.
Fix the mounting bracket to the wall (Figure 3) and use the wall
mounted bracket to mount the unit on (Figure 5).
5 Non-Solid Wall Mounted Unit Installation
Ducting in the
ceiling void.
mounted in a
Side view of unit
a stud partition
cupboard fixed to
with the 25mm
MDF fixed behind
MVHR-DRAIN
the plasterboard.
Condensate drain,
uninsulated drain
pipe with min 5 o
fall running to SVP.
Valve in ceiling.
3.3 O-Site Cupboard Construction
For o-site constructed cupboards adequate support must be
included in the steel frame to support the weight of the units in
operation and to allow for dynamic loads in transit to site.
If the unit is to be bolted to a plywood or MDF backboard then
this must be of sucient thickness to support the unit’s weight
and through-bolted with washers fitted to spread the load.
The cupboard manufacturer should satisfy themselves that the
method of mounting is sucient to support the weight of the unit
in operation and transit to site.
The top of the unit is to be suitably braced within the cupboard for
transport.
3.4 Condensate Drain
•The condensate must be discharged under a water level in
a U-trap drainpipe or an alternative drain method which acts
as an airlock.
•The condensate discharge drain is a 32mm male threaded
connection.
•An additional straight compression connector is also
supplied that can be fitted to convert from the existing
threaded connector.
•If using a U-trap, please ensure the U-trap has been filled to
a suitable level of water to avoid any air locks.
•If the condensation pipe is fitted in an unheated space the
pipe should be in insulated to prevent freezing.
An MVHR-DRAIN is recommended for use as the primary
condensate take-o (Figures 7 and 8).
Min 5o Drop
6 Condensate Trap Installation
Condensate pipe connection
to unit and a typical example of
a “U” trap drainpipe (Standard
configuration only).
Collar
7 MVHR-DRAIN Installation
Condensate drain,
uninsulated drain pipe with
min 5° fall running to SVP.
To SVP
“T” piece
MVHR Drain
To unit
To CONTRAP
8 "T" Piece CONTRAP & MVHR Drain
Connection
When using a “T” 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.
3.5 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 to all habitable rooms e.g. bedrooms and
lounge. Extract / input grilles should be adjustable valve types
(not supplied). External grilles are to have a minimum free area of
12,250 sq. mm.
3.6 Ducting
Before commencing ducting installation reference should be
made to the following regulations:
Building Regulation Approved Document F 2010
(2021 Edition - for use in England).
Building Regulation Approved Document F 2010
(2022 Edition - for use in Wales).
Scottish building standards technical handbook 2022:
Domestic - section 3.14 Ventilation.

4
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
If the enclosure is to be used in conjunction with an ancillary
distribution box (MRXBOX-DB4) refer to additional assembly
instructions supplied with the MRXBOX-DB4 as requirements
will dier. Otherwise fit 4x 200mm diameter spigots with the M4
screws supplied to the spigot fixings plates found on the top
panel of the enclosure, a bead of silicone should be applied
between the two mating faces to prevent leakage.
It is recommended that rigid ducting be used at all times. Flexible
ducting has a very high resistance and it is impossible to calculate
how much resistance will be on a system if used. If used the
flexible ducting must be kept to a minimum and should always be
pulled taut. A maximum of 300mm should be used on each leg.
To prevent condensation on the outside of the outside air inlet
duct and the air outlet duct from the unit, these ducts should be
insulated. Ducting must be installed in such a way that resistance
to airflow is minimised. Bends should be kept to a minimum. A
minimum distance of 300mm between the appliance and any
bends in ductwork is recommended. Ideally 150mm diameter
or 220 x 90mm rectangular ducting should be used (refer to
dwelling design drawing, Figures 12 & 13).
Ducting joints must be sealed with silicone type sealant and shall
be adequately and reliably fixed to the appliance.
3.7 Ventilation Flow Rates
Any air intake terminal must be installed in accordance with
the appropriate regulation. As a guide, the BS5440 series of
British Standards deals with this issue and currently states that
an air intake must be at a minimum distance of 300mm from a
gas boiler balanced flue. Installers are advised to be aware of
the requirements of this standard when installing ‘through the
wall’ supply air ducting.
3.7.1 ADF 2010 Extract Ventilation Rates
Table 1 - From ADF 2010 (England & Wales)
Extract Ventilation Rates
Room Minimum High
rate
Minimum Low
Rate
Kitchen 13 l/s Total extract rate
should be at least
the whole dwelling
ventilation rate
given in table 2.
Utility Room 8 l/s
Bathroom 8 l/s
Sanitary
Accommodation
6 l/s
Table 2 - Whole Dwelling Ventilation Rates
Number Of Bedrooms In Dwelling
1 2 3 4 5
Whole dwelling
ventilation rate
(l/s)
19 25 31 37 43
1. In addition, the minimum ventilation rate should be no less than
0.3 l/s per m² of internal floor area. (This includes all floors, e.g.
for a two-story building add the ground and first floor areas).
2. If the dwelling only has one habitable room, a minimum
ventilation rate of 13 l/s should be used.
3. For each additional bedroom add 6 l/s to the values in table 2.
3.7.2 ADF 2010 Ventilation Calculations Design of MVHR
Systems
1. For dwellings using mechanical ventilation with heat recovery,
each habitable room should have mechanical supply ventilation.
The total supply air flow should be distributed proportionately to
the volume of each habitable room.
2. Mechanical supply terminals should be located and directed to
avoid draughts.
3. The minimum total continuous rate of mechanical ventilation
with heat recovery is the whole dwelling ventilation rate in Table
2.
4. For dwellings using mechanical ventilation with heat recovery,
each wet room should have a minimum continuous mechanical
extract ventilation high rate as given in Table 1.
5. Mechanical ventilation with heat recovery systems should be
designed to avoid the moist air from the wet rooms recirculating
to the habitable rooms.
6. To avoid unintended air pathways, background ventilators
should not be installed with mechanical ventilation with heat
recovery.
3.8 Pre Commissioning MRXBOX MVHR Units
MRXBOX units are designed to ventilate the whole dwelling
and must not be used during site construction or the clean-up
period. Cement and plaster dust can be abrasive and can aect
fan performance and reliability. Please ensure that the filters are
checked prior to commissioning to ensure there is no build-up of
dust or debris.
While the property is drying out, very high moisture levels are
likely to occur. Therefore it is advisable that if the installation and
building works are complete the unit is left running. If the building
works are not complete please close the air valves or cover up
the air valves to prevent condensation forming in the ductwork
and the MRXBOX unit due to natural migration of warm air.

5
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
3.9 Dimensions
9 Unit Dimensions
290 139
485
710
707 577
Ecosmart connection
4 x Spigots
180mm Internal Diameter
200mm External Diameter
View from top
Side view
Front view
18
Mounting Bracket
= =
= =
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
Humidity adjustment
position shown for
standard configuration
unit, for opposite hand
units the humidity
adjustment will be on the
opposite side.
10 MRXBOX95-3SWITCH Dimensions
290 139
485
710
707 577
Ecosmart connection
4 x Spigots
180mm Internal Diameter
200mm External Diameter
View from top
Side viewFront view
18
Mounting Bracket
= =
= =
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
Humidity adjustment
position shown for
standard configuration
unit, for opposite hand
units the humidity
adjustment will be on the
opposite side.
11 Fixing Point Dimenions
290 139
485
710
707 577
Ecosmart connection
4 x Spigots
180mm Internal Diameter
200mm External Diameter
View from top
Side viewFront view
18
Mounting Bracket
= =
= =
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
Humidity adjustment
position shown for
standard configuration
unit, for opposite hand
units the humidity
adjustment will be on the
opposite side.

6
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
3.10 Ducting Arrangements - Standard Unit Configuration
3.10.1 Circular Ducting
12 Typical Circular Ducting Arrangement For Wall Mounted Units
Air supply
to lounge
in ceilings.
via Air Valve
Extract air
from
kitchen/
bathroom
in ceilings.
via Air Valve
Exhaust air from
kitchen/bathroom to
outside via louvre grille.
Minimum distance as specified
in building regulations.
Intake air
from outside
via louvre grille.
All duct between MVHR
unit and atmosphere to
be insulated*.
*Insulated
supply duct.
Top of ceiling void.
Air supply to
bedrooms
in ceilings.
via Air Valve
mounted unit.
Nuaire wall
MVHR-DRAIN
Condensate drain, uninsulated
drain pipe with min 5ofall running to SVP.
*Insulated
extract duct.
3.10.2 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 MVHR
unit and atmosphere to
be insulated*. *Insulated
supply duct.
Air supply
to lounge
in ceilings.
Extract
via Air Valve air from
kitchen/
bathroom
in ceilings.
via Air Valve
Air supply
to bedrooms
in ceilings.
via Air Valve
Top of ceiling void.
mounted unit.
Nuaire wall
MVHR-DRAIN
Condensate drain, uninsulated
drain pipe with min 5ofall running to SVP.
*Insulated
extract duct.
Also from Nuaire:
thermal ducting,
An all-in-one insulated ducting system.
(See installation document 671780)

7
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
4.0 ELECTRICAL INSTALLATION
For good EMC engineering practice, any sensor cables or
switched live cables should not be placed within 50mm of
other cables or on the same metal cable tray as other cables.
The electrical connection of the unit must be carried out by a
qualified electrician. The unit is supplied with a flexible cord for
connection to the mains supply.
Wiring is for reference purposes only, connections shown are
factory fitted. The unit is pre-wired with a 2 metre fly lead.
Disconnection from the supply mains must be incorporated
within the fixed wiring in accordance with the wiring
regulations and shall have a minimum contact separation of
3mm.
4.1 Electrical Information
Voltage: 240V 1ph 50Hz
Consumption: 2.5 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
15 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
(BS1362)
2 Pole
Isolator
4.2.2 Unit Serving One Bathroom
16 Wiring Diagram - Unit Serving One Bathroom
5A Fuse
(BS1362)
MAINS
230V
50Hz N
L
3 Pole
Isolator
3 Position Switch Ancillary code:
MRXBOX95-3SWITCH
Blue
Green/yellow
Brown
Black
Supply cord
from unit
Grey
L1
2
light
Room
Light Switch
(Double Pole)
4.2.3 Unit Serving Two Bathrooms
17 Wiring Diagram - Unit Serving Two Bathrooms
5A Fuse
(BS1362)
Light Switches
(Double Pole)
MAINS
230V
50Hz N
L
3 Pole
Isolator
3 Position Switch Ancillary code:
MRXBOX95-3SWITCH
Blue
Green/yellow
Brown
Black
Supply cord
from unit
Grey
L1
2
Room
lights
4.2.4 Summer / Winter Switch
18 Wiring Diagram - Summer / Winter Switch
Black
2 core cable from
ventilation unit
Red
Volt free Summer / Winter Switch
(supplied with ventilation unit)
Polarity is inconsequential
Warning! - Do not connect to mains!
Supply Supply Extract Extract
Speed1 Speed2 Speed1 Speed2
14 PCB Details

8
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
5.0 COMMISSIONING
The filters fitted inside the unit are protected with a plastic
film. Prior to commissioning remove the covers (Figure 211),
take o the film and replace.
•For the required air flow rates please refer to the design
specification for the property, follow Section 3.7, or refer to
appropriate building regulation (see section 3.6).
•The unit should be run for a minimum of 10 minutes to reach
steady state before commencing commissioning.
•The humidity sensor is initially set to its least sensitive
position, this should be adjusted during commissioning.
Depending on storage and site conditions, the unit may
boost due to high relative humidity levels, this will continue
until the level drops below the specified set point.
•The unit is supplied with independent control for both
normal and boost airflows (Figure 19).
•Correct commissioning is essential to ensure the ventilation
air flow rates are met. It also ensures the unit is not over
ventilating and causing excessive power consumption.
•Commissioning should be carried out in accordance
with appropriate building regulation (see section 3.6). 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 eect on the indoor air quality and could result
in condensation and mould growth. The clear panel covering
the control has an adhesive panel which should be exposed
and sealed post commissioning to prevent tampering.
+ -
Post commissioning remove
adhesive backing and seal
061021
Power Fan
Failure
+ -
Ventilation Controls
-
+
+
-
+
-
Speed 1
-
+
Speed 2 Speed 3
Supply Extract Supply Extract Supply Extract
19 Unit Control On Front Panel
6.0 CONTROLS
6.1 Humidity Adjustment
This product contains an internal humidity sensor fitted into the
air-flow extracting from the wet rooms. When the unit senses that
the humidity exceeds the set point the unit will boost to that set
by the commissioned boost speed. The set point can be found
on the front of the unit (Figure 19) and is at its least sensitive when
turned fully clockwise. Note that the sensor is measuring humidity
from all the wet rooms at the same time and should not be relied
on to solely boost the unit. Additional switch should be used local
to the wet rooms (Section 4.2).
6.2 Status Indication
The status of the unit is indicated by a series of LED’s on the front
cover. The variants are listed below.
The display on the unit control panel will not indicate when a
higher speed setting has been triggered by an external source,
such as an ES-PIR2 etc.
20 Unit Control On Front Panel
HX Bypass
(AB units only)
Speed 1
Speed 2
Speed 3
Supply Fan Fault
Extract Fan Fault
Frost Protection
Filter Change
6.3 Integral Automatic HX Bypass
Intake and extract temperatures are monitored at the point the
airflows enter the unit, if the range falls within the set parameters
the bypass damper is opened automatically to target an indoor
comfort temperature all year round.
The extract temperature is an average from all wet rooms. The
unit targets a temperature below 20°C and may go into bypass
depending on outside temperatures.
6.4 Summer / Winter Switch
When the switch position is set to Summer the integral automatic
summer bypass is fully operational, in the alternative Winter
position the HX bypass is disabled to ensure the unit is constantly
in heat recovery mode.
6.5 Speed 3 Operation (SW Units Only)
Speed 3 will be non-operational if the intake temperature is
greater than the extract temperature.
6.6 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 commissioning of the unit is outside of this time frame
please notify the after sales department prior to site visit.

9
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
9.0 END-OF-LIFE AND RECYCLING
Where possible Nuaire use components which can be largely
recycled when the product reaches its end-of-life:
•Fans, motors, controls, actuators, cabling and other electrical
components can be segregated into WEEE recycling
streams.
•Sheet metal parts, aluminium extrusion, heating/cooling
coils and other metallic items can be segregated and fully
recycled.
•EPP, plastic ducting, nylon corner pieces, plastic heat
exchangers, packaging material and other plastic
components can be segregated into mixed plastic and
widely recycled.
•Cardboard packaging, wood, and other paper components
can be largely recycled or fully processed in energy from
waste centres.
•Filter Disposal: Cardboard framed filters should be fully
processed in energy from waste centres, contact your
local civic amenity site / household waste recycling centre
regarding metal / wire framed filters.
•Remaining Items can be further segregated and processed
in accordance with the zero waste hierarchy. Please call
After Sales Support for further information on items not
listed above.
Ensure that Nuaire product is made safe from any electrical /
water / refrigerant supplies before dismantling commences.
This work should only be undertaken by a qualified person in
accordance with local authority regulations and guidelines,
taking into account all site based risks.
10.0 AFTER SALES AND REPLACEMENT
PARTS
For technical assistance or further product information, including
spare parts and replacement components, please contact the
After Sales Department.
If ordering spares please quote the serial number of the unit
together with the part number, if the part number is not known
please give a full description of the part required. The serial
number will be found on the identification plate attached to the
unit casing.
Telephone [phone]
[email protected]
Technical or commercial considerations may, from time to
time, make it necessary to alter the design, performance and
dimensions of equipment and the right is reserved to make such
changes without prior notice.
7.0 MAINTENANCE
It is important that maintenance checks are recorded and that the
schedule is always adhered to, in all cases, the previous report
should be referred to.
Before commencing work make sure that the unit, switched
live and Nuaire control are electrically isolated from the mains
supply and switched live supply.
7.1 Filters
Filters are to be inspected every 6 months and replaced every
12 months (or sooner if required). Failure to do so may impair
the performance and energy eciency of this unit. A flashing
LED (Section 6.2) will indicate that a filter change is required. This
indication repeats every 12 months and will turn o automatically
after 5 Days.
Remove the filter covers on the front panel of the unit by gripping
the two circular tabs either end of the filter covers and pulling
away from the unit. The filter can now be extracted by pulling the
black removal loop on the front edge of the filter. Once the filters
have been inspected return or replace them as necessary.
21 Filter Removal
Filter covers
Filter being
removed
Filter cover
Filter covers
Filter being
removed
Filter cover
8.0 WARRANTY
The warranty starts from the day of delivery and includes parts
and labour for the first year. The remaining period covers
replacement parts only.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or
not installed, commissioned and maintained in accordance with
the details contained in this manual and general good practice.
The product warranty applies to the UK mainland and in
accordance with Clause 14 of our Conditions of Sale. Customers
purchasing from outside of the UK should contact Nuaire
International Sales oce for further details.
Only genuine Nuaire parts and filters may be used to maintain
the unit. Failure to maintain the unit as recommended will
invalidate the warranty.

10
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
NOTES

11
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
NOTES

12
11. 09. 23. Document Number 671857Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA |nuaire.co.uk
MRXBOXAB-ECO4-SC/SW
Installation Manual
NOTES