4
16. 03. 21. Document Number 671863
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
MRXBOXAB-ECO4-AE(SC/SW)
Installation Manual
Collar
8
MVHR-DRAIN Installation
Condensate drain,
uninsulated drain pipe with
min 5° fall running to SVP.
To SVP
“T” piece
MVHR Drain
To unit
To CONTRAP
9
"T" Piece CONTRAP &
MVHR Drain Connection
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.
3.6 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.
If the enclosure is to be used in conjunction with an ancillary
distribution box (MRXBOX-DB4) refer to additional assembly
instructions supplied with the MRXBOX-DB4 as requirements will
differ.
Otherwise fit 4x 200mm diameter spigots with the M4 screws supplied
to the spigot fixings plates found on the top panel of the enclosure, a
bead of silicone should be applied between the two mating faces to
prevent leakage.
It is recommended that rigid ducting be used at 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 300mm 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 unit, 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 300mm between the appliance and any bends in ductwork is
recommended.
Ideally 150mm diameter or 220 x 90mm rectangular ducting should be
used (refer to dwelling design drawing, Figures 11 & 12).
Ducting joints must be sealed with silicone type sealant and shall be
adequately and reliably fixed to the appliance.
3.7 Ventilation Flow Rates
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.
3.7.1 ADF 2010 Extract Ventilation Rates
Whole Dwelling Ventilation Rates
Number Of Bedrooms In Dwelling
1
2
3
4
5
Whole dwelling
ventilation rate
(l/s)
1,2
13
17
21
25
29
1. In addition, the minimum ventilation rate should be no less than 0.3
l/s per m² of internal floor area. (This includes all floors, e.g. for a two-
story building add the ground and first floor areas).
2. This is based on two occupants in the main bedroom and 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.
3.7.2 Whole Dwelling Ventilation Rates
ADF 2010 - Extract Ventilation Rates
Room
Minimum High rate
Minimum Low Rate
Kitchen
13 l/s
Total extract rate
should be at least
the whole dwelling
ventilation rate given
in table 2.
Utility Room
8 l/s
Bathroom
8 l/s
Sanitary
Accommodation
6 l/s
