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Installation and Maintenance
2.1 Condensate Drain
1. The condensate must be discharged under a water
level in a U-trap drainpipe or an alternative drain method
which acts as an airlock.
2. This condensate discharge connection is suitable for 21.5mm
dia. overflow pipe.
Solvent cement should be used to make the joint.
3. If using a U-trap please ensure the U-trap has been filled to
a suitable level of water to avoid any air locks.
4. 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. (see figure 5b and 5C.
Figure 5a. Wet option.
Condensate pipe
connection to unit and
a typical example of
a "U" trap drainpipe.
Figure 5b. MVHR-DRAIN option.
Condensate drain, uninsulated drain
pipe with 10 o fall running to SVP.
Collar
Figure 5c. IMPORTANT: When using a "T" Piece to connect the
CONTRAP drainage and the MVHR drain pipework the MVHR
drain must always be fitted before the "T" Piece to prevent
condensate from feeding back into the MVHR system.
MVHR Drain
To unit
"T" piece
2.2 Extract/input areas
The unit is designed to extract air from all wet rooms
e.g. bathroom, kitchen, en-suite, utility room (with sink).
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 / input grilles should be adjustable valve types
(not supplied).
External grilles to have a minimum free area of 12,250 sq mm.
2.3 Ducting
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.
MRXBOX95-WH1 Mechanical Ventilation with Heat Recovery
It is recommended that rigid ducting 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 500mm 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 MRXBOX95-WH1, these
ducts should be insulated.
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 200mm between the appliance and
any bends in ductwork is recommended.
Ideally 150mm diameter or 204 x 60mm rectangular ducting
should be used. (Refer to dwelling design drawing, figure 7a
and 7b on page 4 for further information).
Ducting joints must be sealed with silicone type sealant and
shall be adequately and reliably fixed to the appliance.
2.4 Ventilation flow rates
5
o
Drop
Table 1.
ADF2006 / 2010 – Extract ventilation rates
Room
Kitchen
Utility room
Bathroom
Sanitary
accommodation
Table 2.
Whole dwelling ventilation rates
Whole
dwelling
ventilation
rate l/s
1, 2
To CONTRAP
Notes:
In addition, the minimum ventilation rate be should be not
1,
less than 0.3 l/s per m
(This includes all floors, e.g. for a two-story building add the
To SVP
ground and first floor areas).
2,
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.
2
Min high rate
13 l/s
8 l/s
8 l/s
6 l/s
Number of bedrooms in dwelling
1
2
13
17
2
of internal floor area.
This is based on two occupants in the main bedroom and
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.
Similarly, supply and extract air grilles should be at least
300mm apart.
Min low rate
Total extract rate should
be at least the whole
dwelling ventilation rate
given in table 2.
3
4
5
21
25
29
08. 05. 14. Leaflet Number 671548
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