6
Installation
Duct insulation, alt. A
Duct insulation, alt. B
Faulty duct insulation
Condensate drain
The units produces up to 5-8 litres of condensate per
day. It is therefore important that the condensate drain is
correctly made and that the unit has a slight fall towards
the condensate drain. The condensate drain pipe must
be mounted with the necessary gradient and be led to an
internal outlet. The condensate drain must be fitted with a
water trap as there is negative pressure in the air chamber
in which the condensate tray is mounted.
If the unit is installed in a cold loft space, the condensate
drain pipe must be insulated to prevent freezing of the
condensate in the pipe.
However, it is recommended that the water trap is installed
in a heated space to ensure that the water does not freeze.
If installation problems make it impossible to secure the
condensate drain pipe from freezing by insulation, it will be
necessary to mount a thermostat-controlled heating coil
round the condensate drain pipe.
Insulation of ducts in cold loft spaces
In order to high recovery rate of the unit, it is necessary to
insulate the ducts correctly. Supply and extract ducts:
Supply and extract air duct :
To minimize heat losses from the duct system in cold loft
spaces, the supply and extract ducts must be insulated with
minimum a 100 mm insulation mat. If insulation type A is
chosen, it is recommended that it is done with two layers of
50 mm mats wropped with paper or foil on the outside and
with staggered joints between the two layers. If the ducts
are positioned on the rafter foot, type B may be chosen.
The insulation must always be tightly wrapped round the
ducts.
Fresh air and exhaust air ducts in cold spaces :
It is recommended that fresh air and exhaust air ducts
are insulated with a minimum of 50 mm insulation. The
fresh air duct is insulated to prevent warm air in the loft in
summer from heat up the fresh air. Make sure to seal the
termination where the escaping duct is led through the roof
or through the gable end in order to avoid condensation
damage.
Fresh air
Exhaust air
Extract air
Supply air
Airtight connection
100 mm
Air tight connection
Inside outlet
No water in siphon:
= Outlet is blocked
= Underpressure which leeds to
false air
