Condensate drain
The units produce up to 6 litres of condensate per day. It is
therefore important that the condensate drain is correctly
executed and that the unit has a slight slope towards the
floor gully/drain.
The condensate drain pipe must be air tight for example by
bending a copper pipe as an siphon or using a standard
siphon as illustrated..
Use an armed water hose between the drain connecting
piece on the unit and the siphon and tightend it in both ends
with a collar band.
From the siphon and to floor gully/drainage point a
necessary slope at 1% is required.. The condensate drain
must be fitted with a water trap as there is negative
pressure in the 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 siphon is installed in a heated space below to ensure
that the water in it 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 tape
around the condensate drain pipe.
During operation there will be an under pressure in the unit
it will therefor be neccesary to make sure that the siphon
contains a minimum of 50 mm watercolumn.
Insulation of ducts in cold loft spaces
In order to exploit the unit’s high heat recovery potential
(efficiency), it is necessary to insulate the ducts correctly.
Supply and extract ducts
To minimise heat losses from the duct system in cold loft
spaces, the supply and extract ducts must be insulated with
a minimum of 100 mm insulation. If insulation form
alternative A is used, it is recommended that it is executed
with two layers of 50 mm Lamella mats with paper or foil
externally and with staggered joints between the two
layers. If the ducts are laid on the rafter foot, alternative B
may be used. The insulation must always be tightly packed
round the ducts.
Fresh air and escaping ducts in cold spaces
It is recommended that fresh air and escaping 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 heating up the fresh air. Take care to seal the
termination where the escaping duct is led through the roof
or through the gable end, in order to avoid condensation
damage.
Duct insulation, alt. A
Duct insulation, alt. B
Faulty duct insulation
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