Danfoss Duct System Installation guide

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
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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
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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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