7
nuaire.co.uk
029 2085 8400
04. 09. 19. Leaflet Number 671789
Installation and Maintenance
Student Accommodation Ventilation Unit
8.0 COMMISSIONING
The unit is supplied with independent fan speed control via the potentiometers
(see Figure 6) for both normal and boost and maximum airflows.
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 for the
commissioning, and adjustment valves should be locked in place to prevent
further adjustment.
Once commissioned 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.
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Power
Post commissioning remove
adhesive backing under
this section
060905
Ventilation Controls
For commissioning:
refer to user manual
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Control module
Figure 10. Commissioning control.
9.0 STATUS INDICATION
The status of the unit is indicated by a series of LED’s on the front cover. The
variants are listed below.
HX Bypass
(AB units only)
Speed 1
Speed 2
Speed 3
Supply Fan Fault
Extract Fan Fault
Frost Protection
Filter Change
9.1 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.
Please note 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.
9.2 HX Bypass
The HX bypass damper shall open automatically under certain scenarios
allowing the supply air to bypass the heat exchanger. These scenarios are
described below.
1. Outdoor temp >10°C
AND
Indoor temp > Outdoor temp
AND
Inside temp > 25°C
2. Outdoor temp > 10°C
AND
Outdoor temp > Indoor temp
AND
Outdoor temp < 25°C
Note: An amount of hysteresis is included in the strategy such that the
"current" condition is maintained until 1°C past the control point.
10.0 MAINTENANCE
We recommend that the two G3 filters are inspected after 6 months and
replaced every 12 months; this interval may need to be shortened, if the unit is
operating under adverse environmental conditions.
The filters can be removed from the unit by removing the two filter covers on
the bottom panel of the unit. Take hold of the two circular tabs either end of the
filter covers and pull to remove (see Figure 7).
The filter can now be extracted by pulling the removal loop on the edge of the
filter. Once the filters have been inspected return or replace them as necessary
and refit the filter cover.
To fit the filter cover, insert both ends of the cover into the filter slot and press
down on the centre (see Figure 8). Ensure that a full seal is made between the
unit and the cover. Any incorrectly fitted covers will cause a performance drop
of the unit.
Inspect the heat exchanger every 5 years. Generally check for damage and
security of components.
Access to
second filter
Filter cover and
filter being removed
Control
module
MVHR-DRAIN
condensate drain
running to svp
Figure 11. Filter replacement.
