Domus Ventilation HRXE-HERA-OPH Руководство по установке - Страница 4
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Angled bracket Loft mounted Unit Installation
3.3 Condensate Drain
The condensate must be discharged under a water level in a U-trap
drainpipe or an alternative drain method which acts as an airlock. This
condensate discharge connection is suitable for 21.5mm Ø overflow
pipe. Solvent cement should be used to make the joint.
If using a U-trap please ensure the U-trap has been filled to a suitable
level of water to avoid any air locks. If the condensation pipe is fitted
in an unheated space the pipe should be in insulated to prevent
freezing. An MVHR-DRAIN is recommended for use as the primary
condensate take-off (Figures 10 and 11).
3.4 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 are to have a minimum free area of 12,250 sq. mm.
3.5 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.
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 204 x 60mm rectangular
ducting should be used (Figures 13 & 14). Ducting joints must be sealed
with silicone type sealant and shall be adequately and reliably fixed to
the appliance.
3.6 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.
671950 | DeCembeR 2020
ADF 2010 - Extract Ventilation Rates
Room
Kitchen
Utility Room
Bathroom
Sanitary
Accommodation
Whole Dwelling Ventilation Rate
Whole dwelling
ventilation rate (l/s)
1,2
Notes:
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 ADF 2010 Ventilation Calculations Design of MVHR
Systems
The mVHR system has been sized for the winter period. Additional
ventilation may be required during the warmer months and it has
been assumed that the provisions for purge ventilation (e.g. openable
windows) could be used.
Step 1:
For any design air permeability, determine the whole dwelling
ventilation supply rate from
Whole Dwelling Ventilation Rates table.
As an alternative where the design air permeability is intended to be
more than (>) 5m3/(h.m2) 50 Pa, allow for infiltration for all dwelling
types by subtracting from the whole dwelling ventilation supply rate
from
Whole Dwelling Ventilation Rates
volume of the dwelling heated space (m3).
Step 2:
Calculate the whole dwelling extract ventilation rate by
summing the individual room rates for 'minimum high rate' from
2010 - Extract Ventilation Rates table.
(For sanitary accommodation only, as an alternative, the purge
ventilation provisions given in ADF 2010 can be used where security is
not an issue. In this case 'minimum high extract rate' for the sanitary
accommodation should be omitted from the step 2 calculation).
Step 3:
The required airflow rates are as follows:
•
The maximum whole dwelling extract ventilation rate (e.g. boost)
should be at least the greater of step 1 and step 2. Note that the
maximum individual room extract rate should be at least those given in
ADF 2010 - Extract Ventilation Rates table.
•
The minimum air supply rate should be at least the whole building
ventilation rate found in step 1.
For Scotland refer to BRE Digest 398.
For further information refer to "Domestic Ventilation
Compliance Guide" www.planningportal.gov.uk/
buildingregulations/approved documents/partl/compliance
Minimum
Minimum Low Rate
High Rate
13 l/s
Total extract rate
8 l/s
should be at least
the whole dwelling
8 l/s
ventilation rate given
in table 2.
6 l/s
Number Of Bedrooms In Dwelling
1
2
3
4
13
17
21
25
table; 0.04 x gross internal
5
29
ADF
PAGe 4