1.14
Commissioning
Balancing and Commissioning
Before commissioning a system it is
important that there is a sufficient gap below all doors to
allow for air circulation and we recommend a gap of between 8mm to 10mm
To obtain a quiet and efficient MVHR system the system must be balanced to achieve the
recommend air change rates in each room.
On all bespoke in-house designed systems, we will supply you the required air flow rates on
the final design as part of our installation pack.
To commission a ventilation system an airflow meter (Anemometer) is required to allow you
to measure the air velocity in metres per hour (M3h/r) or Litres per second (L/s) at each inlet
or extract point as required for Building Regulations Part F.
We can help by supplying you details of a local technician to commission the system or
provide details of a company that hires the air meters.
Contact Us! - Website: www.bpcventilation.com - Tel: 028 2827 5150 - Email: technical@bpcventilation.com
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To commission system:
1. Adjust all air-valves by closing them then opening them by 2 full turns and set unit speed.
2. Start at the furthest extract valve and check the air flow volumes at all of the outlets and
note the air volume to each room, whilst doing this make sure that the direction of flow is
correct.
3. If the measured air flow is above or below the requirement set out on the provided flow
rates adjust each air valve by rotating the central cone on its screw thread to increase or
decrease the size of the air opening.
4. Replace the cover and re-measure the air volume. Repeat this process until the correct
flow rate is achieved.
5. Once all the extract rates are achieved, repeat the process for the supply valves.
6. When all inlets and outlets are measured it may be found that the total for extract or supply
maybe greater or lesser than required in which case the speed of the fans must be adjusted
at the air handling unit. (See MVHR manual on how to adjust).
Note: As any adjustments of individual air valves will affect the flow rates of all other valves
on the duct system it will usually be necessary to re-balance the system three or more times
before the correct readings are achieved in every room.