MRXBOXAB-ECO2B-SW (Standard Unit)
MRXBOXAB-ECO2B-OHSW (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.
•
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.
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.
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
1.3 Personal Protective Equipment
This manual contains important information on the safe and
appropriate assembly, transport, commissioning, operation,
maintenance, disassembly and simple troubleshooting of the product.
The following minimum Personal Protective Equipment (PPE) is
recommended when interacting with Nuaire 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.
•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.
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
10. 11. 21. Document Number 672001
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MRXBOXAB-ECO2B-(OH)SW
Installation Manual
2.0 INTRODUCTION
3.1 Wall Mounting
The ECO2 wall mounted range of units is designed to provide
mechanical supply and extract ventilation with heat recovery.
If fitting the MVHR in conjunction with a MRXBOX-AV2 the
hanging brackets supplied with the MVHR are redundant and
should not be used. The installation instructions supplied with
MRXBOX-AV2 should be followed.
The unit is fitted with two independent fans. 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.
3.0 MECHANICAL INSTALLATION
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.
Please note a clear working space is required around the installed unit
to allow the cover to be removed and provide sufficient access for
maintenance such as filter change.
The unit is designed for wall mounting, only on a solid wall. A
gypsum block or stud/plasterboard wall will not suffice.
1. One part of the mounting bracket (supplied) should be offered 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).
2. Install the unit on the wall by ensuring the bracket fixed to the rear
of the unit interlocks over the wall mounted bracket (Figure 4).
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.
3 Wall Mounting Bracket
Allow a minimum of 350mm in front of an MRXBOXAB-ECO2 unit.
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 off will cause long
term damage to the unit and building fabric.
4 Mounting Unit Onto Bracket
1 Airflow Through unit (Standard Unit)
Intake air
from outside
Exhaust air
from house
to outside
Supply air
to house
Extract air
from house
3.1.1 Option 1 - Solid Wall
The MVHR unit fixed to a solid wall construction using the
mounting bracket provided.
2 Airflow Through OH unit (Opposite Hand Unit)
Extract air
from house
Supply air
to house
5 Solid Wall Mounted Unit Installation
Exhaust air
from house
to outside
Intake air
from outside
Ducting in the
ceiling void.
Valve in ceiling.
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.
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3.1.2 Option 2 - Non-Solid Wall
3.2.2 Option 2 - Angled Brackets
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.
The MVHR unit should be positioned on a 25mm minimum
thickness MDF panel that is vertically fixed across the roof trusses
to form a solid false wall.
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.
Add additional vertical supports if necessary. Use the Anti-vibration tray
assembly (MRXBOX-AV2) including the angle brackets, to be purchased
separately.
Height wise, ideally, the MDF panel should extend from floor to ceiling
but as a minimum should be a least 2m high.
8 Angled Brackets Loft Mounted Installation
Fix the mounting bracket to the wall (Figure 3) and use the wall
mounted bracket to mount the unit on (Figure 4).
6 Non-Solid Wall Mounted Unit Installation
Ducting in the
ceiling void.
Valve in ceiling.
Side view of unit
mounted in a
cupboard fixed to
a stud partition
with the 25mm
MDF fixed behind
the plasterboard.
MVHR-DRAIN
Condensate drain,
uninsulated drain
pipe with min 5 o
fall running to SVP.
3.2 Loft Mounting
3.2.1 Option 1 - Tank Stand
3.3 Off-Site Cupboard Construction
For off-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.
The MVHR unit should be positioned on a tank stand using the
Anti-vibration tray assembly discarding the angle brackets.
If the unit is to be bolted to a plywood or MDF backboard then this
must be of sufficient thickness to support the unit’s weight and
through-bolted with washers fitted to spread the load.
Anti-vibration tray assembly (MRXBOX-AV2) is to be purchased
separately.
7 Tank Stand Loft Mounted Unit Installation
The cupboard manufacturer should satisfy themselves that the method
of mounting is sufficient 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. This
condensate discharge connection is suitable for 21.5mm Ø overflow
pipe. Solvent cement should be used to make the joint.
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-off (Figures 10 and 11).
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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.
9 Condensate Trap Installation
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.
Min 5 o Drop
Ideally 150mm diameter or 204 x 60mm rectangular ducting should be
used (Figures 13 & 14).
Condensate pipe connection to
unit and a typical example of a
“U” trap drainpipe (Standard
configuration only).
Ducting joints must be sealed with silicone type sealant and shall be
adequately and reliably fixed to the appliance.
3.7 Ventilation Flow Rates
10 MVHR-DRAIN Installation
ADF 2010 - Extract Ventilation Rates
Room
Collar
Condensate drain,
uninsulated drain pipe with
min 5° fall running to SVP.
Minimum High rate
Kitchen
13 l/s
Utility Room
8 l/s
Bathroom
8 l/s
Sanitary
Accommodation
6 l/s
Minimum Low Rate
Total extract rate
should be at least
the whole dwelling
ventilation rate given
in table 2.
Whole Dwelling Ventilation Rates
11 "T" Piece CONTRAP & MVHR Drain Connection
Number Of Bedrooms In Dwelling
MVHR Drain
To CONTRAP
To unit
To SVP
“T” piece
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.
Whole dwelling
ventilation rate
(l/s)1,2
1
2
3
4
5
13
17
21
25
29
Notes:
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 twostory building add the ground and first floor areas).
2. This is based on two occupants in the main bedroom and a single
occupant in all other bedrooms. This should be used as the default
value. If a greater level of occupancy is expected add 4 l/s per occupant.
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.
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 building regulations document “Domestic ventilation compliance
guide”. This document supports ADF2010 and details installation,
testing and commissioning of all ventilation systems.
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.
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•The minimum air supply rate should be at least the whole building
ventilation rate found in step 1.
3.8 ADF 2010 Ventilation Calculations Design of MVHR
Systems
The MVHR system has been sized for the winter period. Additional
ventilation may be required during the warmer months and it has
been assumed that the provisions for purge ventilation (e.g. openable
windows) could be used.
For Scotland refer to BRE Digest 398.
Step 1: For any design air permeability, determine the whole dwelling
ventilation supply rate from Whole Dwelling Ventilation Rates table.
3.8.1 Pre Commissioning MRXBOX MVHR Units
As an alternative where 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).
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 affect 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.
Step 2: Calculate the whole dwelling extract ventilation rate by
summing the individual room rates for ‘minimum high rate’ from ADF
2010 - Extract Ventilation Rates table.
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.
(For sanitary accommodation only, as an alternative, the purge
ventilation provisions given in ADF 2010 can be used where security is
not an issue. In this case ‘minimum high extract rate’ for the sanitary
accommodation should be omitted from the step 2 calculation).
For further information refer to “Domestic Ventilation Compliance
Guide” www.planningportal.gov.uk/buildingregulations/approved
documents/partl/compliance
Step 3: The required airflow rates are as follows:
•The maximum whole dwelling extract ventilation rate (e.g. boost)
should be at least the greater of step 1 and step 2. Note that the
maximum individual room extract rate should be at least those
given in ADF 2010 - Extract Ventilation Rates table.
3.9 Dimensions
12 Unit Dimensions
Front View
Side view
507
Mounting Bracket
(not to be used
when unit is fitted in
conjunction with
MRXBOX-AV2)
356
607
Unit Weight = 20Kg
16
Top View
172
172
90
416
Spigots
4 x 125mm dia.
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
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3.10 Ducting Arrangements - Standard Unit Configuration
3.10.1 Circular Ducting
13 Typical Circular Ducting Arrangement For Wall Mounted Units
Exhaust air from
kitchen/bathroom to
outside via louvre grille.
Minimum distance as specified
in building regulations.
*Insulated
extract duct.
Top of ceiling void.
Air supply
to lounge
via Air Valve
in ceilings.
Intake air
from outside
via louvre grille.
All duct between MVHR
unit and atmosphere to
be insulated*.
*Insulated
supply duct.
Extract air
from
kitchen/
bathroom
via Air Valve
in ceilings.
Air supply to
bedrooms
via Air Valve
in ceilings.
Nuaire wall
mounted unit.
MVHR-DRAIN
Condensate drain, uninsulated
drain pipe with min 5o fall running to SVP.
3.10.2 Rectangular Ducting
14 Typical Rectangular Ducting Arrangement For Wall Mounted Units
*Insulated
extract duct.
Exhaust air from
kitchen/bathroom to
outside via air brick.
Minimum distance as specified
in building regulations.
Top of ceiling void.
Air supply
to lounge
via Air Valve
in ceilings.
Intake air
from outside
via air brick.
All duct between MVHR
unit and atmosphere to
be insulated*.
Air supply
to bedrooms
via Air Valve
in ceilings.
Extract
air from
kitchen/
bathroom
via Air Valve
in ceilings.
*Insulated
supply duct.
Nuaire wall
mounted unit.
MVHR-DRAIN
Condensate drain, uninsulated
drain pipe with min 5o fall running to SVP.
ALSO FROM NUAIRE New
range of thermal ducting,
an all-in-one insulated ducting system
(see installation document 671780)
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
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MRXBOXAB-ECO2B-(OH)SW
Installation Manual
4.0 ELECTRICAL INSTALLATION
15 PCB Details
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.
EXTRA
EXTRA
CTCT
FANF
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.
4.1 Electrical Information
Voltage: 240V 1ph 50Hz
Consumption: 1.2 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.
The unit is
pre-wired with a
2 metre fly lead.
Supply Extract Supply Extract Supply Extract
SPEED 1
SPEED 2
SPEED 3
4.2 Wiring Diagrams
4.2.1 Unit Serving Kitchen And Bathroom
16 Wiring Diagram - Unit Serving Kitchen And Bathroom
Supply Cord
From Unit
Green / Yellow
MAINS
230V
50Hz
Blue
N
L
Brown
3A Fuse
(BS 1362)
Room
Light
Black
3 Pole
Isolator
Light
Switch
(Double
Pole)
Grey
Optional 3 Speed Switch
Kitchen Switch
4.2.2 Unit Serving Kitchen And Two Bathrooms
17 Wiring Diagram - Unit Serving Kitchen And Two Bathrooms
Supply Cord
From Unit
Green / Yellow
MAINS
230V
50Hz
Blue
N
L
Brown
3A Fuse
(BS 1362)
Room
Lights
Black
3 Pole
Isolator
Light
Switches
(Double
Pole)
Grey
Optional 3 Speed Switch
Kitchen Switch
4.2.3 Summer / Winter Switch
18 Wiring Diagram - Summer / Winter Switch
2 core cable
from unit
Red
Black
Volt free Summer / Winter Switch (supplied with unit)
Polarity is inconsequential
Warning! - Do not connect to mains!
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5.0 COMMISSIONING
5.2 Status Indication
The filters fitted inside the unit are protected with a plastic film.
Prior to commissioning remove the covers (Figures 20 & 21), take
off the film and replace.
The status of the unit is indicated by a series of LED’s on the front cover.
The variants are listed below.
1. For the required air flow rates please refer to the design specification
for the property, follow 2.4, or refer to building regulations ADF
2010.
2. The unit is supplied with independent control for both normal and
boost airflows (Figure 19).
3. 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.
4. Commissioning should be carried out in accordance with building
regulations document “Domestic ventilation compliance guide”.
www.planningportal.gov.uk/building regulations/approved
documents/partf/associated. A calibrated moving vane
anemometer and hood will be required to carry out commissioning.
5. Adjustment valves should be locked in place to prevent further
adjustment.
6. 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 covering the control has an adhesive
panel which should be exposed and sealed post commissioning to
prevent tampering.
7. Speed 1 is limited to never exceed speed 2, when commissioning
speed 2 should always be set first.
19 Unit Control On Front Panel (Standard Configuration Only)
The display on the unit control panel will not indicate when a
higher speed setting has been triggered by an external source.
20 Unit Control On Front Panel (Standard Configuration Only)
Speed 1
Speed 2
Speed 3
Supply Fan Fault
Extract Fan Fault
Frost Protection
Filter Change
HX Bypass
(AB units only)
5.3 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.
5.4 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.
5.5 Speed 3 Operation (SW Units Only)
Speed 3 will be non-operational if the intake temperature is greater
than the extract temperature.
5.6 Frost Protection
Post commissioning remove
adhesive backing and seal
Ventilation Controls
Speed 1
+
-
+
Speed 2
-
+
-
+
Speed 3
-
+
-
+
-
Supply Extract Supply Extract Supply Extract
Power
Fan
Failure
Humidity adjustment situated
behind front panel, panel must
be removed for access.
This should only be carried
out by a qualified person.
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.
5.1 Humidity Adjustment
This product contains an internal humidity sensor fitted into the airflow 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 behind 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
4.2.3).
Adjustment only to be carried out by qualified person, isolate
power before removing cover.
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MRXBOXAB-ECO2B-(OH)SW
6.0 MAINTENANCE
8.0 END-OF-LIFE AND RECYCLING
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.
Where possible Nuaire use components which can be largely recycled
when the product reaches its end-of-life:
6.1 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 efficiency of this unit. A flashing LED
(Section 5.2) will indicate that a filter change is required. This indication
repeats every 12 months and will turn off 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 Removing Filter Covers
•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.
Filter covers
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.
9.0 AFTER SALES AND REPLACEMENT PARTS
22 Removing Filters
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.
Filter being
removed
Filter cover
7.0 WARRANTY
The 5 year warranty starts from the day of delivery and includes parts
and labour for the first year. The remaining period covers replacement
parts only.
Telephone 02920 858 400
[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.
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 office for
further details.
Failure to maintain the unit as recommended will invalidate the
warranty.
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
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MRXBOXAB-ECO2B-(OH)SW
NOTES
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MRXBOXAB-ECO2B-(OH)SW
NOTES
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MRXBOXAB-ECO2B-(OH)SW
NOTES
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