Carrier 50EH, Installation, Operation And Maintenance Instructions

Page: 19 / 36

Packaged rooftop units
19
With outdoor temperatures which are lower than 0ºC the
necessary precautions must be taken to prevent the water in
the drain ducts from freezing.
CONNECT SIPHON
METTRE SIPHON
PONER SIFON
V220014
Indoor circuit condensate
drain pan
Outdoor circuit condensate
drain pan (optional)
In units where the outdoor condensates pan is optional, the outdoor
circuit drain (junction 1” M) is independent from the indoor circuit drain.
Do not connect both drains.
Outdoor circuit
pans (optional)
Condensate drain connection
All models are equipped with a condensate drain pan in the indoor circuit,
with a bronze, gas threaded 1 1/4” M drain junction.
Check the connection tightness.
Siphon installation norms
- Check that the condensate outlet is not clogged.
- All water drain tubes must be provided with a siphon to avoid bad
smell and water spills.
Perform the assembly as per the scheme of the attached starting
diagram:
Pan in overpressure:
• It is installed to avoid the access through the drain piping of bad
smells.
Pan in underpressure:
Besides the previous application, water must be sucked from the pan:
• 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.
• The drain piping must be slightly sloped to ease circulation towards
the drain.
• The original diameter of the piping must be respected. No reduction
can be made.
A
Condensates pan
in depression
A
Siphon drain
Slight slope
5/1000
To drainage
Some options have their own pan with independent drain junction,
gas threaded:
- Cooling recovery circuit: 3/4” M in bronze.
- Gas burner: consult in the speci
fi
c instruction brochure of burners
(supplied with the burner).
The air supply and return ducts must be calculated in accordance with
the nominal
fl
ow and the unit’s available pressure (refer to the technical
characteristics table). The duct calculation and design must be made
by quali
fi
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
de
fl
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 affect
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.
- Consideration should be given to the need to install
fi
lters on the
return ducts, taking into account any particles in suspension existing
which could settle inside the machine (e.g. textile
fi
bres).
- Flexible connections must be made between the ducts and the unit
that avoid the noise and vibration transmission.
- No matter the type of ducts used, they must be isolated 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 effective
legislation about this issue must be respected.
Air ducts connections