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Installation and Maintenance
6.0 Commissioning
All infomation on this page is specific to the MVHR unit fitted
inside the enclosure, the front panel of the enclosure must be
removed to gain access.
The filters fitted inside the unit are protected with a
plastic film. Prior to commissioning remove the covers
(fig 15), take off the film and replace.
2/ 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.
3/ The unit is supplied with independent control for both normal
and boost airflows. (see fig. 14).
4/ 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.
5/ 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.
6/ Adjustment valves should be locked in place to prevent further
adjustment.
7/ 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.
8/ Speed 1 is limited to never exceed speed 2 when commissioning
speed 2 should always be set first.
Figure 14. Detail of unit control
on front panel.
(Standard configuration only).
Speed 1
Speed 2
Speed 2
Speed 1
6.1 Speed 3
The unit has to 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 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 (see Fig. 14) 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).
Humidity
adjustment.
(AB unit only).
(AB unit only).
7
The WM2 Wall Mounted Range of Units
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.
Speed 1
Speed 2
Speed 3
Supply Fan Fault
Extract Fan Fault
Frost Protection
Filter Change
HX Bypass
(AB units only)
8.0 Thermal Bypass (Non AB models)
In the event of excessive outside temperatures, and to help prevent
over-heating, the supply fan will automatically reduce to a trickle
speed. Under these circumstances additional ventilation measures may
be required e.g. open windows or trickle vents (if fitted).
9.0 Maintenance/Cleaning
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.
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.
Figure 15. Removing the two filter covers on the front panel of the
unit. The filters can be removed by pulling on the black tab on the
visible end of the filters.
Filter
Filter cover
060923
Heat Exchanger
MVHR unit cover
27. 11. 17. Leaflet Number 671733
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