MAKING MODERN LIVING POSSIBLE
Installation Guide
Duct System
for Danfoss Air Units
www.heating.danfoss.com
Danfoss A/S is not liable or bound by warranty if these
instructions are not adhered to during installation or service.
The English language is used for the original instructions.
Other languages are a translation of the original instructions.
(Directive 2006/42/EC)
© 2011 Copyright Danfoss A/S
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Installation Guide
1 Installing Valves
Duct System
Placing the valves
Start by deciding on the location of the valves, using the enclosed
technical drawing as a guideline. If the drawing indicates a valve in
the path of e.g. electrical wiring, water ducts or wooden joists, the
fvalves can of course be moved.
Avoid placing air diffusion valves above places where people may
be located for long periods, such as sofa, bed, dining table, etc. If a
wood-burning stove is present, it is best to place the air diffusion
valve nearby.
The extraction valves are meant to remove moist ”contaminated”
air. They should therefore be placed as close as possible to the
source, e.g. above washbasins, in shower cabinets, etc.
Drilling holes in the ceiling
A hollow drill should be used for making the holes for the valves.
Use the following drill sizes:
Ø 100 mm valves: hollow drill Ø 108 mm.
▪
Ø 125 mm valves: hollow drill Ø 133 mm.
▪
Mounting the valves
Fix the valve bayonet socket to the ceiling. For gypsum ceilings,
place a wooden plate on the back for the screws to bite into.
If the duct needs to pass through insulation, we recommend
measuring the insulation section and installing a duct section
along a suitable length of the bayonet socket (VGU or VGM). Use a
NPU connection nipple to connect the VGM and the duct section.
Avoid damaging the damp course unnecessarily and always remember to repair it with weatherproof tape from the ceiling side
afterwards.
The size and shape of the valves varies depending on the air direction and volume.
Supply air valve
Danfoss Heating Solutions VIFYB102
Extract air valve
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Ø 125
Ø 100
Ø 100
Installation Guide Duct System
2 Installing Ducts
To achieve the highest operational efficiency, the duct system
should be installed as compact as the building construction allows
by keeping the duct sections as short as possible and using as few
bends as possible.
If the ducts are located on the loft floor, they can be secured using
duct clips.
Duct clip
Duct clips can also be used if the duct system is suspended from
the roof, using UV fixing hangers, if required.
Always use appropriate protective equipment (i.e. protective goggles, ear defenders, etc.).
Connecting the duct system
Push the connector into the duct, until the stopsick is reached
(slightly turning the connector will make the assembly easier).
T-connector
Fix the connectors to the duct with at least two self-tapping
screws or pop rivets (three for ducts of Ø140 mm or more). Make
sure that the safe rubber strips are not damaged. In case of incorrect assembly, screw/pop rivet holes should be sealed up.
Assembling T-connector and ducts
Example of duct installations
Note!
the ducts must not rest on the valves or hang in the roof ter-
▪
minals.
place a soft material between the duct and the rafters/duct
▪
clip to avoid vibration noise.
avoid installing damaged products (e.g.dented ducts), as this
▪
may reduce the performance of the system and can result in
leaks.
the ducts should be placed in the insulation, in order to mini-
▪
mise heat loss (see page 5 "Insulating the Duct System").
Adjusting the ducts
Use a hacksaw or angle grinder to adjust the ducts.
Remove all sharp edges on the duct to avoid damaging the rubber
seals on the fitting parts.
The standard length of ducts is 3 metres. To connect two ducts,
use an NPU nipple with a rubber strip.
NPU nipple
To reduce a branch, use a TCPU T-section.
To reduce the main duct, use a RCFU reduction.
TCPU
RCFU
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Adjusting duct length
VIFYB102 Danfoss Heating Solutions
30˚
30˚
30˚
30˚
70
600
1200
SLU
SR
SR
BU
Installation Guide Duct System
Crossing ducts
If two ducts need to cross, we recommend installing the duct that
runs along the beam underneath the duct crossing it to reduce
heat loss.
Crossing ducts
To get your duct down into the insulation as quickly as possible,
we recommend the solution illustrated.
Connection to unit (side view)
Connection to unit (top view)
Connection between ducts and unit
It is important that all 4 flanges are connected to the ducts with a
flexible connection, so that potential vibrations are not transferred
from the unit to the ducts system.
If a preheating or geothermal surface is present, the fresh air intake must as minimum be covered by 100 mm of insulation.
50 mm of insulation is adequate for sound dampers, as they already have 50 mm of insulation.
Make sure that the insulation is fixed tightly around the ducts.
Incorrect insulation
If possible, the ducts can be run in or under the attic insulation.
Ducts in attic insulation
Avoid bending the flex pipe as this will add to an increased pressure loss in the system. When mounting, the flex pipe should be
stretched as far as possible – without deforming the pipe.
It is recommended to use an insulated flex pipe type THISOL.
Mount hose clamps around the outer layer of plastic in order to
ensure air tightness.
Insulating the duct system
It is important that the duct system is insulated correctly.
The supply and the extract must as minimum be covered by 100
mm of insulation. It is recommended to use two layers of 50 mm
paper or foil covered lamella mat mounted with staggered joints.
If steel wire is used to fasten the insulation, make sure that the insulation is not deformed or broken by the wire.
Note! The above should be considered as recommendations only. Always follow any country-specific regulations.
Sound Damping
Sound damping the duct system is a very important element in
achieving the general feeling that you have the perfect indoor climate. The noise in a ventilation system comes primarily from the
unit’s ventilators. This noise can be propagated throughout the
duct system and out into individual rooms unless there is proper
sound damping. It is therefore also very important that silencers
are positioned correctly in the duct system.
There are several methods of sound damping, e.g.:
The silencer positioned directly after the unit, before the main duct
branches out (sound damper effective on entire system).
Insulation of ducts
Two silencers positioned on each side of theT-section, before
The fresh air intake and the exhaust must as minimum be covered
branching to a room.
by 30 mm of insulation to protect against condensation.
Danfoss Heating Solutions VIFYB102
5
1 m
3 m
3 m
+
Pos.
+ ÷
Pos.
Installation Guide Duct System
As well as damping the noise from the ventilators, it is important
to ensure that noise does not propagate from room to room, i.e.
where noise runs through the ventilation ducts from room to
room. To avoid this, install a small silencer on the branch to the
rooms that you want to damp.
For room-to-room sound damping, use SLU-100-300 and
SLU-125-300, depending on the dimension of the branch.
Roof Terminals
Roof terminals/wall grills and roof ducts are the outside visible
part of the ventilation system. If possible, they should therefore be
adapted to the architectural style of the house.
The roof terminals should be placed at least 3 metres apart horizontally or 1 metre apart vertically, always with the discharge terminal at the top.
Avoid positioning the discharge lower than the top edge of the
top window and closer than 1 metre to the nearest window.
It is recommended to place terminals/grills on a north- or east-facing surface to achieve the best and most comfortable operation of
the system.
If the roof terminal is installed on a tiled roof, we recommend using a pre-insulated Lindab GISOL roof duct.
3 Adjusting Valves
The following are guideline settings only.
Adjusting Supply Valves
Start by fully closing the valve (not too tight!). Then open the valve
the number of times indicated in the diagram, which is provided
with the assembly drawing of the ducts system.
We also recommend using Lindab SBG installation fittings and a
Lindab MG membrane duct for a correct finish against the subroof.
Rotate the cone the number of times indicated in the diagram:
+ 5 = anti-clockwise 5 times
– 5 = clockwise 5 times
Adjusting Extract Valves
Start by setting the valve to position 0, which in practice means
opening the central cone so the middle of the cone is in line with
the frame.
anti-clockwise clockwise
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VIFYB102 Danfoss Heating Solutions
Installation Guide Duct System
Danfoss Heating Solutions VIFYB102
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Installation Guide Duct System
Danfoss A/S
Heating Solutions
Haarupvaenget 11
8600 Silkeborg
Denmark
Phone:+45 7488 8000
Fax: +45 7488 8100
Email: heating.solutions@danfoss.com
www.heating.danfoss.com
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respective
companies. Danfoss Heating Solutions and the Danfoss Heating Solutions logotype are trademarks of Danfoss A/S. All rights reserved.
VIFYB102 Produced by Danfoss Heating Solutions © 11/2011
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