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INSTALLATION
Consult the regulator manufacturer for orifice selection.
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If two or more springs are available for a particular
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outlet pressure in the desired range use the spring with
the lower range for better accuracy.
For multiple boiler installations it is recommended
ƒ
that an individual line gas pressure regulator be
used to step-down the gas pressure at each boiler.
Where a single regulator is used for multiple boilers
the regulator must be appropriate for the entire gas
delivery turndown range. This includes all boilers on at
full fire to one boiler on at low fire.
ƒ Gas Piping Installation
Field gas piping must be installed in accordance with NFPA
54 National Fuel Gas Code, ANSI Z223.1, and any other local
codes which may apply. Adhere to the following for gas
piping installation:
1. See Table 3 for required natural gas pipe size, based on
overall length of pipe from the meter plus equivalent
length of all fittings. Approximate sizing may be based
on 1,020 BTU for 1 cubic foot of natural gas. See Figure
9 for the typical field piping arrangement.
2. Piping must be of the proper size to ensure adequate
gas supply. It is typical for gas delivery piping to be up-
sized one or several diameters larger than boiler gas
inlet size.
3. The pipe and the fittings used must be new and free of
dirt or other deposits.
4. When making gas-piping joints, use a sealing
compound resistant to the fuel gas serving the boiler.
5. Install a manual gas shutoff valve and union (not
supplied) prior to the boiler.
6. Piping must be installed such that no piping stresses
are transmitted to the boiler. The boiler cannot be used
as a pipe anchor.
7. All gas piping connections must be checked for leaks
before being placed into service. Test with compressed
air or inert gas if possible.
8. The boiler gas train must be disconnected at the boiler
manual shutoff valve from the gas supply piping system
during any pressure testing of the system at pressures
in excess of 0.5 psig (14 inch W.C.).
2-14
9. After completing pressure testing and obtaining any
necessary approvals from the AHJ, introduce gas service
and purge gas piping in accordance with local codes.
Do not purge their contents into a confined space or
where fuel gas can accumulate.
10. The boiler gas train has been factory leak tested,
however, fittings may loosen during shipping or
installation. After gas piping is completed and before
wiring installation is started, all piping connections
(factory and field) must be carefully checked for gas
leaks. Use a soap and water solution or combustible
gas detector. A GAS-Mate
recommended.
ƒ Components Requiring Ventilation to the
Outdoors
An authority having jurisdiction (AHJ) may not permit the
use of a vent limiter on some or all components. If venting is
required, use the following general guidelines:
Drill an appropriately sized penetration for each vent
ƒ
line through the topmost panel on the rear of the boiler
cabinet. Do not install any vent lines through removable
panels. Properly seal around the pipe with silicone to
maintain a sealed cabinet and ensure combustion air
will not bypass the filter.
Each component must have a separate vent line to
ƒ
the outdoors. Vent lines must not be manifolded or
combined with any other vent or exhaust systems.
Start with the vent connection size and as soon as it is
ƒ
practical, increase the pipe size one diameter. For every
ten feet of vent, increase the pipe size one diameter.
Never reduce the vent size.
Protect the vent termination from debris, dust and
ƒ
insects. Install the vent termination above the snow
line and point down to prevent ingress of water. The
termination must be a minium of 3 ft (0.9 m) from a
source of ignition.
SECTION 2
EXE-IOM-230112
0119 or equivalent is
®
© Fulton Group N.A., Inc. 2023
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