MRXBOXAB-ECO-LP2SW (Standard Hand Unit)
MRXBOXAB-ECO-LP2-OHSW (Opposite Hand Unit)
Mechanical Ventilation Unit with Heat Recovery for Ceiling Void Mounting
Installation Manual
EMC Directive
2014/30/EU
LVD Directive
2014/35/EU
1.0 SAFETY INFORMATION
•
•
•
•
•
•
•
•
The provision of the electrical supply and the connection of the unit to the electrical supply
must be carried out by a qualified electrician in accordance with latest edition of the wiring
regulations.
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. The replacement cord must be of the same
technical specification as the original cord or greater.
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
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.
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2.0 INTRODUCTION
The LP2 ceiling void mounted unit is designed to provide mechanical
supply and extract ventilation with heat recovery and incorporates HX
bypass. Bypass operation can be disabled via a manual switch in colder
months so the unit recovers heat continually.
The fan must be installed indoors, in a suitable ceiling void away from
direct sources of frost, heat, water spray or moisture generation. For a
vibration-free result the unit must be mounted to a solid surface in the
void.
The unit is designed for ceiling mounting only (Horizontal surface).
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 80% of the normally wasted heat.
The unit is supplied with a steel mounting bracket.
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.
The mounting bracket should be on the same side as the
condensate take off.
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.
4. Using appropriate fixings (supplied by others) fix the unit to the
ceiling. It is recommended that the unit is fixed through three holes on
the non-bracket side and the two outer holes on the bracket side.
1 Unit Airflow Paths (Standard Unit Configuration)
Spigot 3.
Spigot 2.
Position & secure the steel bracket to the ceiling using appropriate
fixings (supplied by others), ensuring that the two outer fixing holes on
the unit are accessible (Figure 3).
3. The unit can now be offered into position & located into the
mounting bracket.
The unit must be installed in an upright position as shown for
the condensate drain and for compliance with safety regulations
relating to IP protection for water drip ingress.
3 Standard Unit Mounting Using Appropriate Fixing Bolts
Steel mounting bracket
Spigot 1.
Spigot 4.
Spigots 1 to 4
1. Intake Air (Fresh air from outside).
2. Supply Air (Supply in to house).
3. Extract Air (Warm stale air from house).
4 Side View Of Standard Unit Typical Ceiling Void Installation
4. Exhaust Air (Waste air to oustide).
Using 204 x 60 mm Rectangular Ducting & Air Valves
2 Unit Airflow Paths (Opposite Hand Unit Configuration)
Spigot 1.
Spigot 4.
Spigot 3.
Spigot 2.
Spigots 1 to 4
1. Intake Air (Fresh air from outside).
2. Supply Air (Supply in to house).
3. Extract Air (Warm stale air from house).
4. Exhaust Air (Waste air to oustide).
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.
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
Air valve
in ceiling.
204 x 60mm
ducting in
ceiling void.
Side view of unit
mounted in the ceiling void.
3.1 Condensate Drain Installation
•Unit comes complete with external drain pipe (21.5mm waste
pipe). Use conventional plumbing connections to link up with
U-trap or alternative drain method (Solvent cement connections
or compression fit connections are recommended). 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 dia.
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.
Nuaire recommend MVHR-DRAIN be used as the primary condensate
take-off (Figures 5 & 6).
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5 Typical Condensate Pipe Connection Using MVHR-DRAIN
Ancillary
3.3 Ducting Installation
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 must be used it 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 MRXBOXAB-ECO-LP2, these ducts should
be insulated.
6 MVHR-DRAIN Installation
CORRECT
INCORRECT
Flow
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.
Side elevation
When installed horizontally the ribs must be at the bottom to
ensure correct operation.
3.1.1 MVHR-DRAIN Installation
Offer up the MVHR-DRAIN inlet to the threaded tail of the appliance
waste outlet or MVHR-DRAIN knuckle or running adaptor, and tighten
the threaded cap sufficiently hand-tight to provide a water-tight seal
(check that the cap screws on square and does not ‘cross-thread’).
When the screwed cap is tight, the MVHR-DRAIN body is secure.
•Cut the pipe to length, allowing for the full compression socket
depth (using an appropriate pipe cutter, such as a Hepworth
ratchet pipe cutter).
•Remove any ‘swarf’ from the end of the plastic pipe. Ream the
copper pipe end to remove any ‘burr’, and file if necessary to
remove any external sharp edges. Mark the socket depth on the
pipe, and check that the pipe section to be jointed is free of any
surface damage which may affect the joint seal.
204 x 60mm rectangular ducting should be used (refer to dwelling
ducting design drawing, Figures 8 & 10 for further information).
Ducting joints must be sealed with silicone type sealant and needs
to be taped. Ducting shall be adequately and reliably fixed to the
appliance.
3.4 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.
3.4.1 ADF 2010 - Extract Ventilation Rates
•Unscrew the cap from the MVHR-DRAIN outlet, and slide the cap
and rubber seal onto the pipe.
•Insert the pipe end fully into the socket.
•Slide the rubber seal and screwed cap up against the face of the
socket, and tighten the cap sufficiently hand-tight (check that the
cap is square to the body and does not ‘cross thread’). Hand tight
should be adequate to form a proper seal.
Room
Min high rate
Kitchen
13 l/s
Utility Room
8 l/s
Bathroom
8 l/s
Sanitary
Accommodation
6 l/s
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 & Supply grilles should be adjustable valve types (not supplied).
External grilles must have a minimum free area of 12,250 mm2.
Total extract rate
should be at least
the whole dwelling
ventilation rate given
in table 2.
3.4.2 Whole Dwelling Ventilation Rates
Number of bedrooms in dwelling
3.2 Extract & Supply Areas
The unit is designed to extract air from all wet rooms e.g. bathroom,
kitchen, en-suite, utility room (with sink).
Min low rate
Whole dwelling
ventilation rate
(l/s)
1
2
3
4
5
13
17
21
25
29
1,2
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. 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.
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3.5 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.
Step 1: For any design air permeability, determine the whole dwelling
ventilation supply rate from Table 2.
As an alternative where the design air permeability is intended to be
leakier than (>) 5m3/(h.m2) 50 Pa, allow for infiltration for all dwelling
types by subtracting from the whole dwelling ventilation supply rate
from Table 2; 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 high rate’ from Table
1.
(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).
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 table 1 for minimum high rate.
The minimum air supply rate should be at least the whole building
ventilation rate found in step 1.
For Scotland refer to BRE Digest 398.
For further information refer to the “Domestic Ventilation Compliance
Guide”.
3.6 Pre Commissioning MRXBOXAB MVHR Units
MRXBOXAB 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.
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 MRXBOXAB
unit due to natural migration of warm air.
3.7 Dimensions (mm) - Standard Unit Configuration
7 Unit Dimensions (mm) - Standard Unit Configuration
View from underside with cover removed (B)
View from top (A)
900
Spigot 1.
Intake
Air
668 hole centres
Spigot 2.
Supply
Air
Spigot 4.
Exhaust
Air
4.
Wire
frame
filter
Wire
frame
filter
3
1.
Removable
filter
access
Removable
filter
access
Access
Requirements
250
Extract
fan
2.
371
700
Spigot 3.
Extract
Air
21.5mm condensate pipe
Supply
fan
885 hole centres
Bypass
chamber
Heat
exchanger
Drip tray
Bypass
damper
600
View from control side
(A)
End view
200
67
97
735 (Filter access distance)
121
69
857
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3.8 Typical Ducting Installation - Standard Unit Configuration
8 Typical Ducting Installation - Standard Unit Configuration
Top of ceiling void.
Supply air to
bedrooms via
Air Valve
in ceilings.
Exhaust air from
kitchen/bathroom to
outside via air brick.
Supply air to
lounge via
Air Valve
in ceilings.
Minimum distance as
specified in Building
Regulations.
Extract air from
kitchen via
Air Valve
in ceilings.
Intake air from
outside via air brick.
Extract air from
bathroom via
Air Valve
in ceilings.
Nuaire ceiling void
mounted unit.
MVHR-DRAIN
condensate drain,
running to SVP.
Supply and extract
ducts from external
air bricks to the unit
needs to be insulated.
3.9 Dimensions (mm) - Opposite Hand Unit Configuration
9 Dimensions (mm) - Opposite Hand Unit Configuration
View from underside with cover removed (B)
View from top (A)
600
Spigot 4.
Exhaust
Air
Spigot 3.
Extract
Air
Spigot 1.
Intake
Air
Drip tray
Bypass
damper
Removable
filter
access
1.
3.
371
Spigot 2.
Supply
Air
Heat
exchanger
Removable
filter
access
688 Hole Centres
250
700
Bypass
chamber
Access
Requirements
Wire
frame
filter
Wire
frame
filter
2.
885 hole centres
4.
Supply
fan
900
View from control side
(A)
Extract
fan
21.5mm condensate pipe
End view
200
67
121
69
735 (Filter access distance)
97
857
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3.10 Typical Ducting Installation - Opposite Hand Unit Configuration
10 Typical Ducting Installation - Opposite Hand Unit Configuration
Top of ceiling void.
Supply air to
bedrooms via
Air Valve
in ceilings.
Exhaust air from
kitchen/bathroom to
outside via air brick.
Supply air to
lounge via
Air Valve
in ceilings.
Minimum distance as
specified in Building
Regulations.
Extract air from
kitchen via
Air Valve
in ceilings.
Intake air from
outside via air brick.
MVHR-DRAIN
condensate drain,
running to SVP.
Supply and extract
ducts from external
air bricks to the unit
needs to be insulated.
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.
Extract air from
bathroom via
Air Valve
in ceilings.
Nuaire ceiling void
mounted unit.
4.2 PCB Details
11 PCB Details
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.
4.1 Electrical Information
Electrical details:
Voltage: 240V 1ph 50Hz
Consumption: 1.3 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.
FAIL
Wiring is for reference purposes only as the connections in Figure 11 are
factory fitted. The unit is pre-wired with a 2 metre fly lead.
For Ecosmart sensors/controls cut a slit in the grommet and feed
the Ecosmart connector through to retain sufficient protection
against water ingress. Ensure Ecosmart cabling is secured with
P-clips supplied to provide suitable cable retention.
Supply Supply Extract Extract
Speed1 Speed2 Speed1 Speed2
If more than one Ecosmart sensor is required please use MRXBOX-JB
and refer to leaflet No. 671700 for installation instructions.
4.3 Wiring Diagrams
4.3.1 Unit Serving Kitchen & Bathroom
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.
12 Wiring Diagram - Kitchen & Bathroom
MAINS
230V
50Hz
Supply Cord
From Unit
Green / Yellow
Blue
N
L
Brown
3A Fuse
(BS 1362)
Room
Light
Light
Switch
(Double
Pole)
Black
3 Pole
Isolator
Grey
Optional 3 Speed Switch
Kitchen Switch
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4.3.2 Unit Serving Kitchen & 2 Bathrooms
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.
13 Wiring Diagram - Kitchen & 2 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
4.3.3 Summer / Winter Switch
14 Wiring Diagram - Summer / Winter Switch
15 Commissioning Controls
2 core cable
from unit
Control module
Red
Black
Volt free Summer / Winter Switch (supplied with unit)
Polarity is inconsequential
Warning! - Do not connect to mains!
5.0 COMMISSIONING
The filters fitted inside the unit are protected with a plastic film.
Prior to commissioning remove the covers (Figure 15), take off the
film and replace.
•For the required air flow rates please refer to the design
specification for the property, follow Section 3.5, or refer to
building regulations ADF 2010.
•The unit is supplied with independent control for both normal and
boost airflows (Figure 15).
Speed 1
•Correct commissioning is essential to ensure the ventilation air
flowrates are met. It also ensures the unit is not over ventilating
and causing excessive power consumption.
•Commissioning should be carried out in accordance with building
regulations document “Domestic ventilation compliance guide”.
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 label covering the control has an adhesive
panel which should be removed post commissioning to prevent
tampering.
Speed 2
Speed 1
Speed 2
6.0 CONTROLS
6.1 Integral Automatic HX Bypass (AB Units Only)
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.
6.2 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.
6.3 Speed 3 Operation (SW Units Only)
Speed 3 will be non-operational if the intake temperature is greater
than the extract temperature.
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.
This mode 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.
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6.5 Status Indication
8.0 WARRANTY
The status of the unit is indicated by a series of LED’s on the control box
cover. The variants are listed below.
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.
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.
16 Status Indication
Speed 1
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.
Speed 2
Speed 3
Supply Fan Fault
Extract Fan Fault
Failure to maintain the unit as recommended will invalidate the
warranty.
Frost Protection
9.0 END-OF-LIFE AND RECYCLING
Filter Change
HX Bypass
(AB units only)
Where possible Nuaire use components which can be largely recycled
when the product reaches its end-of-life:
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.
•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.
Isolation - Before commencing work make sure that the unit,
switched live and control are electrically isolated from the mains
supply and switched live supply.
•EPP, plastic ducting, nylon corner pieces, plastic heat exchangers,
packaging material and other plastic components can be
segregated into mixed plastic and widely recycled.
7.1 Filter Replacement
•Cardboard packaging, wood, used filters and other paper
components can be largely recycled or fully processed in energy
from waste centres.
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 6.2) 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 removal loop on
the front edge of the filter. Once the filters have been inspected return
or replace them as necessary.
•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
17 Filter Replacement
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.
The supply cable must be replaced by an electrically competent
person.
Telephone 02920 858 400
[email protected]
Access to second filter
Filter cover and
filter being removed
Control module
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.
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