Carrier 50FF 020 Installation, Operation And Maintenance Instructions page 53

12 - FACTORY OPTIONS AND ACCESSORIES
Gas connections
The gas connection must be made respecting the installation
regulations in force, and sized to ensure the correct gas delivery
to the burner.
Before making the connection, check that:
■ The gas type is suitable for the boiler. Do not use any fuels
other than those provided under any circumstances.
■ If the boiler needs to be adapted for use with another gas fuel,
contact the Technical Assistance Service to have the necessary
modifi cations made. These operations may not be performed
by the installer under any circumstances.
■ The piping is thoroughly clean.
■ The gas meter 's flow rate is capable of ensuring the
simultaneous use of all the appliances connected to it. The
appliance's connection to the gas supply line must be carried
out in accordance with the current regulations.
■ Intake pressure with the appliance in the off position has the
following reference values:
- Powered by methane gas: optimal pressure 20 mbar.
- Powered by L.P.G.: optimal pressure 35 mbar.
■ The pressure never falls below 15 mbar.
While it is normal for the intake pressure to decrease while the
boiler is in operation, it is advisable to verify that no excessive
pressure fl uctuations take place. In order to limit the extent of these
types of variations, the diameter of the gas supply line to be used
must be assessed based on the length and the pressure drops of
the line itself, from the meter to the thermal module.
■ If fl uctuations in the gas distribution pressure are encountered,
it is recommended to install an appropriate pressure stabiliser
upstream of the boiler's gas intake. For G30 and G31 gas
supply, all the necessary precautions must be taken in order
to prevent the gas from freezing in the case of extremely low
outdoor temperatures.
■ If the gas distribution network contains solid particles, install
a fi lter on the fuel supply line. When selecting it, consider that
pressure drops due to the fi lter should be as low as possible.
■ Once the boiler has been installed, check the connections are
sealed according to current installation regulations.
GAS 1" M
Connection at the fl ue
The boiler is supplied as standard in B-type confi guration (B23-
B53P-B53P), i.e. pre-fi tted to suction air directly into the installation
room and may be converted into a C-type appliance with the use
of specifi c accessories.
For fl ue gas extraction and the intake of combustion air, it is
essential to use only specifi c pipes for condensing boilers and
ensure that they are correctly connected.
Diameter of the fl ue gas outlet (fl ue connection):
* Condexa PRO 40 / 50 / 70: DN80
* Condexa PRO 100: DN110
Optionally, a kit with all the fl ue gas accessories can be supplied:
DN80
794
100
Note: dimensions in mm
Preparation for the condensate drain
The condensate produced by the appliance Condexa PRO during
normal operation must be extracted using an accessory (siphoned
condensate collector).
This accessory must be fi tted below the aforementioned thermal
module, in line with the following instructions:
■ It is advised to use plastic (PP) piping for building the condensate
drainage. Never use copper pipes under any circumstances,
as the condensate itself will cause them to rapidly deteriorate.
■ The connection pipes used must be as short and as straight
as possible. Any curves or sharp bends can lead to hoses
becoming clogged and, therefore, can prevent proper
condensate discharge.
■ Important: The minimum distance between the condensate
outlet and the ground must be at least 300 mm to facilitate the
proper implementation of the siphon. Therefore, it is essential to
provide a roofcurb for installation of the 50FF/FC unit on it.
Note: optionally 50FF/FC units can be supplied with roofcurb.
DN110
825
100
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