12
Extract air duct
Warm spaces
• Insulation is not required in standard ventilation.
Cold/semi-warm spaces
• In standard ventilation the insulation must be
designed and implemented so that the maximum
air temperature change in the duct is less than 1°C.
• For example, 100 mm of sheet, mat, or pipe-
covering insulation can be used (plus the
blown wool, when used).
In heating and cooling use see tables "Ventilation duct
thermal insulation in heating use" on page 11 and
"Ventilation duct thermal insulation in cooling use" on
page 11.
Exhaust air duct
Cold spaces
• 100 mm of sheet, mat, or pipe-covering insulation.
Warm/semi-warm spaces
• Option 1
• 80 mm insulation with vapour proof external
surface.
• Option 2
• 20 mm of cellular rubber insulation on the
duct surface and 50 mm insulation with
vapour proof external surface.
The insulation must prevent water vapour from
condensing to the external and internal duct surfaces.
Extractor hood duct
• The extractor hood duct must be insulated and
constructed in accordance with local building and
re safety regulations.
Installing duct coils
Duct coils are used in several unit models both as pre-
heaters, after-heaters and coolers. For information what
type of coils are used with your ventilation unit model,
refer to tables listing models with duct coils at the end
of this manual. For correct mounting of duct coils, refer
to the principal diagrams at the end of this manual.
Ventilation unit models equipped with duct coils for
after-heating or cooling (see table "Models with duct
coils" on page 36).
• These coils are installed in the supply air duct (after
the ventilation unit).
Ventilation unit models equipped with pre-heating/pre-
cooling coils (see table "Pre-heating and pre-cooling
coils" on page 37).
• These coils are installed in the outside air duct
(before the ventilation unit).
• Duct coils must be accommodated in the
ventilation ducts.
• There must also be sucient room for
maintenance and draining of condensate water.
NOTE: For more technical details about the
coils, see the technical data table at the end of
this manual.
Duct coil for uids
When installing duct coils:
• Place the duct coil in the supply air duct after the
ventilation unit or in the outside air duct before
the ventilation unit depending on its function.
• Make sure that there is a lter before pre-heater
coils in the outside air duct to prevent dirt from
entering the coil.
• Do not install the coil too close to a fan outlet or a
bend in the ducting.
• This can result in lower eciency.
• Connect the coil so that the system is easy to
empty for maintenance.
• Install duct heaters in a horizontal or a vertical duct
with optional direction of airow.
• To facilitate venting of the coil, the unit
must be tted with the longitudinal tubes
horizontal.
• Install duct coolers in a horizontal duct with airow
in the direction of the arrow.
• Insulate the cooler externally to prevent the
formation of condensation.
• Connect the cooler to a condensate drain
and water trap and tilt it at an angle of 10-15
degrees to the horizontal in the direction of
the drain.
• Insert the coil into standard spiral ducting and
attach it to the ducting with screws.
• Support the weight of the coil.
• Connect the coil with clamping ring
connectors.
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