Instruction manual
21
5.13 - Gas supply
piping
WARNING!!! Check that the type
and the pressure of the gas
supplied correspond with those
required for the boiler as stated on
the rating plate. Never use a gas
different than that stated on the
boiler rating plate. Failure to
comply with this warning can result
in a fire or explosion causing
extensive property damage, severe
personal injury or death!
If the gas type and/or the supply
pressure do not match those stated
on the boiler rating plate the boiler
must be converted to the type of gas
and/or supply pressure available. A
conversion kit is supplied together
with the boiler.
The boiler comes from the factory
ready to be piped to the gas supply.
The National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and local codes for
gas piping requirements and sizing
must be followed.
Install a manual gas shutoff valve
and drip leg as shown in Figure 15.
The gas supply piping to the boiler
must be properly sized to guarantee
that the gas supply meets the
maximum requirements. If more than
one appliance is supplied by the same
gas supply pipe, the gas supply piping
must be sized based on the maximum
possible demand. Do not neglect the
pressure drop due to pipe fittings.
Table 1 below, should be used in
conjunction with Table 2 below, to
ensure that the gas supply piping is
sized properly. See section 14 for
values of “maximum gas supply
pressure” and “minimum gas supply
pressure” and also section 11.7.
Before installation a thorough
internal cleaning of the gas supply
line should be performed. Figure 12
shows the positioning of the gas
connection on the heater.
The boiler and its gas connection
must be leak tested before placing
the boiler in operation.
To avoid damaging the gas control,
perform a leak test at a pressure of
no greater than 20 in W.C. (50
mbar).
WARNING!!! Never use an open
flame to test for gas leaks. Always
use an approved leak detection
method. Failure to comply with this
WARNING could result in an
explosion!
The boiler and its individual shutoff
valve must be disconnected from the
gas supply piping during any
pressure testing at test pressures in
excess of 1/2 psi (3.5 kPa).
The boiler must be isolated from the
gas supply piping by closing its
individual manual shutoff valve during
any pressure testing at test
pressures equal to or less than 1/2
psi (3.5 kPa).
5.14 - Operating at
high altitudes
For installations in the United States,
the boiler is rated for operation at
altitudes up to 2,000 ft (609 m). For
installations at higher altitudes in the
United States, follow local codes or, in
the absence of local codes, follow
ANSI Z223.1/NFPA No. 54, The
National Fuel Gas Code. For
installations in Canada, the boiler is
rated for installations up to 2,000 ft
(609 m). For installations above this
altitude, follow local/provincial codes.
Figure 15 - Gas supply
piping
5 - INSTALLATION - Mounting & gas and water connections