Gas Connections; Combustion Gas Exhaust - Riello Condexa PRO NA 75P Installation, Operation And Service Manual

2.11 Gas connections

Installation of the boiler and gas connection must comply with all
applicable codes and regulations imposed by the national, Fed-
eral or local authorities and bodies. If no specific requirements
are defined, in the USA, the latest edition of the National Fuel Gas
Code ANSI Z223.1/NFPA 54 must be complied with. In Canada, in-
stallation must be in accordance with the requirements of CAN/CSA
B149.1, Natural Gas and Propane Installation Code. Ensure the gas
line is sized adequately to deliver gas to the burner.
Before making the connection, check that:
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The gas type is suitable for the appliance
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If the appliance needs to be adapted for use with another gas
fuel, refer to section "Converting gas type". For further infor-
mation please contact your local Riello distributor.
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Ensure the piping is thoroughly clean
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The gas meter's flow rate is capable of ensuring the simul-
taneous use of all the appliances connected to it. The appli-
ance's connection to the gas supply line must be carried out
in accordance with the latest edition of the National Fuel Gas
Code ANSI Z223.1/NFPA 54, in the USA, and CAN/CSA B149.1, Nat-
ural Gas and Propane Installation Code, in Canada as well as
local regulations.
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Intake pressure with the appliance in the off position has the
following reference values:
− Natural Gas: optimal pressure 7" w.c.
− Liquid Propane Gas (LPG): optimal pressure 11" w.c.
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The minimum and maximum pressure for natural gas are 3.5"
W.C. (8.72 mbar) and 10.5" W.C. (26.15 mbar) respectively.
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The minimum and maximum pressure for LP gas are 8" W.C.
(19.9 mbar) and 13" W.C. (32.3 mbar) respectively.
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WARNING: Do not use any fuels with this product other than
the fuel it is intended to be used with, either Natural Gas or
LPG.
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Ensure the gas lines are vented, bled in accordance to ANSI
Z223.1/NFPA 54, National Fuel Gas Code and/or CAN/CSA B149.1,
Natural Gas and Propane Installation Code.
While it is normal for the inlet pressure to decrease while the ap-
pliance is in operation, it is advisable to verify that no excessive
pressure fluctuations 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 boiler.
9
WARNING: If fluctuations in the gas distribution pressure are
encountered, it is recommended to install an appropriate
pressure regulator upstream of the appliance's gas inlet. For
LPG 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
filter on the fuel supply line. When selecting it, consider that pres-
sure drops due to the filter should be as low as possible.
0
CAUTION: The boiler and its individual shut off valve must be
disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of
1/2 psi (3.5 kPa).
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A sediment trap must be provided upstream of the gas con-
trols.
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A gas shutoff cock shall be located upstream of the boiler on
the gas supply line.
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On completion of the installation, check that all joints are
sealed.
Condexa PRO NA
DESCRIPTION
Gas inlet 1 1/4" NPT

2.12 Combustion gas exhaust

For flue gas exhaust and the intake of combustion air, it is essen-
tial to use only specific approved pipes for condensing boilers and
ensure that they are correctly connected, as shown in the instruc-
tions supplied by the vent manufacturer.
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WARNING: Do not connect this appliance's flue gas exhaust
pipes with those of other appliances, unless this is specifi-
cally authorized by the manufacturer. Failure to comply with
this precaution may cause a build-up of carbon monoxide in
the room where the appliance is installed causing substantial
property damage, server personal injury or death.
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NOTE: For further information on flue gas exhaust pipes for the
Condexa PRO NA series connected in a cascaded system, see
section "Multiple boiler cascade system".
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WARNING: Ensure that Intake combustion air is not contami-
nated by:
− waxes/chlorinated detergents
− chemical products based on swimming pool chlorine
− calcium chloride
− sodium chloride used to soften tap water
− refrigerant leaks
− paint or varnish removers
− chloridric acid/muriatic acid
− cements and glues
− anti-static softeners used in dryers
− chloride used for domestic or industrial applications as de-
tergent, whitener or solvent
− adhesives used to glue construction and other similar
products.
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GAS 1 1/4" NPT
Condexa PRO NA
75 P 117 P
1 1/4" NPT
INSTALLATION
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