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7 - CHECKING BEFORE COMMISSIONING
7.4 Air ducts connections
The air supply and return ducts must be calculated in accordance
with the rated fl ow and the unit's available pressure (refer to the
technical brochure of this series).
The duct calculation and design must be made by qualifi ed
technical personnel.
It is advisable to take into consideration the following
recommendations:
- Curves in the fan supply outlet(s) must be avoided. It is
recommendable to have a straight section of duct measuring
approximately 1 metre. If it is not possible, they must be as
smooth as possible, using indoor defl ectors when the duct is
of large dimensions.
- When making the ducts, direction sharp changes must be
avoided since they can generate occasional pressure drops,
which aff ect the available pressure and the fl ow. The location
of discharge and aspiration grilles must be studied carefully to
avoid the air recirculation and the transmission and generation
of noises to the interior.
- Flexible connections must be made between the ducts and
the unit that avoid the noise and vibration transmission.
- No matter the type of ducts type to use, these must be
insulated and not be composed of materials that propagate
fi re nor expel toxic gases in the event of a fi re. The internal
surfaces must be smooth and should not pollute the air that
circulates within them. In any case, the eff ective legislation
about this issue must be respected.
Caution: These units are designed to be connected to
a duct network. In the event that the outlet fan of the
indoor circuit is accessible from a particular point in
the duct network, the installer must install a protection
mesh in the discharge as per the current regulation.
7.5 Condensate drain connection
Models 90 to 360
These indoor units are equipped with a
condensate drain pan, with a bronze, gas
threaded 3/4" M drain junction.
Models 420 to 600
These indoor units are equipped with a
condensate drain pan, with a bronze, gas
threaded 1 1/4" M drain junction.
Siphon installation norms
All water drain tubes must be provided with a siphon to avoid
bad smell and water spills.
Pan in overpressure:
It's installed to avoid the access through the drain piping of bad
smells.
Pan in underpressure:
Besides the above application, water must be suctioned from
the pan because of the depression with respect to the motorfan
assembly.
- Perform the siphon assembly as per the scheme of the
attached starting diagram:
• For the correct siphon design, the "A" height must be at
least twice that of the underpressure (mm.w.c) where the
condensate pan is placed.
• Check that the condensate outlet is not clogged.
CONNECT SIPHON
• The drain piping must be slightly sloped to ease circulation
METTRE SIPHON
PONER SIFON
towards the drain.
V220014
• The original diameter of the piping must be respected. No
reduction can be made.
Condensates pan
in depression
Condensate drain
CONNECT SIPHON
METTRE SIPHON
PONER SIFON
V220014
Check the watertightness of the connection.
Condensate drain
Slight slope
5/1000
To drainage
Siphon drain
11
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