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15. 12. 21. Document Number 671985
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
MRXBOXAB-ECO2B-AE(-D)
Installation Manual
5.0 COMMISSIONING
The filters fitted inside the unit are protected with a plastic film.
Prior to commissioning remove the covers (Figure 19, take off the
film and replace.
•
For the required air flow rates please refer to the design
specification for the property, follow Scetion 3.7, or refer to
building regulations ADF 2010.
•
The unit is supplied with independent control for both normal and
boost airflows (Figure 17).
•
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 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.
•
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 covering the control has
an adhesive panel which should be exposed and sealed post
commissioning to prevent tampering.
•
Speed 1 is limited to never exceed speed 2, when commissioning
speed 2 should always be set first.
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Front Panel Unit Control Detail
Humidity adjustment situated
behind front panel, panel must
be removed for access.
This should only be carried
out by a qualified person.
Speed 2
Speed 1
Speed 2
Speed 1
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
panel of the unit (Figure 17) and is at its least sensitive when turned
fully clockwise. 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).
Adjustment only to be carried out by qualified person, isolate
power before removing cover.
6.0 CONTROLS
6.1 Speed 3
The unit has the ability to override both speed 1 and speed 2 to operate
the fan to maximum airflow. See wiring diagram for details of operating
this facility.
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.
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LED Indicators
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. If this
exceeds 25°C the unit may go into bypass depending on outside
temperatures.
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 commissioning of the unit is outside of this time frame please
notify the after sales department prior to site visit.
6.5 Remote Visual Display (-D Units Only)
Supplied with 5m pre-fitted cable for connection to MRXBOX-VSC-B
touch screen display only. Other displays or controls should not be used
with this cable.
