Isolation - Before commencing work make sure that the
unit, switched live and Nuaire control are electrically
isolated from the mains supply and switched live supply.
6
08. 05. 14. Leaflet Number 671640
Installation and Maintenance
MRXBOX95AB-WM2 Mechanical Ventilation with Heat Recovery & Summer Bypass
The filters fitted inside the unit are protected with a
plastic film. Prior to commissioning remove the covers
(fig 13), take off the film and replace.
Filter covers
Figure 12. Removing
the two filter covers
on the front panel of
the unit.
Filter being
removed
Filter cover
Figure 13.The filters
can be removed by
pulling on the black
tab on the visible end
of the filters.
Figure 11. Detail of unit control
on front panel.
Humidity
adjustment.
6.0 Commissioning
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 2006/2010.
2. The unit is supplied with independent control for both normal
and boost airflows. (see fig. 11).
3. 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.
4. 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.
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 label covering the
control has an adhesive panel which should be removed post
commissioning to prevent tampering.
6.1 Summertime boost facility
The unit has to ability to override both the trickle and boost
speeds to operate the fan to maximum airflow. See wiring
diagram for details of operating this facility.
6.2 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 on the front of the unit (see Fig 11) 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 (see wiring
diagrams).
7.0 Status Indication
The status of the unit is indicated by a series of LED’s on the
front cover. The varients are listed below.
8.0 Maintenance/Cleaning
We recommend that the two G3 fiters are inspected after
6 months, and replaced every 12 to 18 months.
The filters can be removed from the unit by removing the two
filter covers on the front panel of the unit. Take hold of the two
circular tabs either end of the filter covers and pull out.
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.
Inspect the heat exchanger every 5 years. Generally check
for damage and security of components. Refit cover.
Normal Mode
Supply Fan Fault
Extract Fan Fault
Boost
Summer Boost
Frost Protection
Filter Change
Summer Bypass
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