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Piping
Hazardous Gases and Flammable Vapors!
Exposure to hazardous gases from fuel substances have been shown to cause cancer, birth
defects or other reproductive harm. Improper installation, adjustment, alteration, service or use
of this product could cause flammable mixtures. To avoid hazardous gases and flammable
vapors follow proper installation and set up of this product and all warnings as provided in this
manual. Failure to follow all instructions could result in death or serious injury.
Flammable Vapors!
When connecting to existing gas lines be sure to valve off the gas supply ahead of connection
point. To avoid explosion or possible fire, always purge all residual gas from piping before
cutting into existing line or removing threaded fittings. Failure to remove all gas vapors could
result in death or serious injury or equipment or property-only-damage.
Gas Piping Recommendations
Note: Installation must conform with the American National Standard Z223.1 (NFPA 54), the
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Proper Gas Pressure
NOTICE:
Excessive Gas Pressure!
The gas pressure at the inlet to the gas train must not exceed 14 inches wc. A properly sized gas
regulator that provides a maximum of 14 inches wc. of gas pressure, must be supplied in the gas
inlet line to unit. Failure to maintain proper gas pressure may result in damage to the gas train
components.
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CLCH-SVX08A-EN
WARNING
WARNING
National Fuel Gas Code, latest edition, in the absence of local codes.
Gas piping should always be done in accordance with local codes.
Tighten all joints securely.
Pipe unions should be a "ground joint" type to prevent leakage.
Provide adequate support for field-installed piping to avoid placing stress on the gas train and
controls.
Run takeoff lines from the side or top of the main gas line to prevent moisture from being drawn
into the gas train of the unit.
Provide a drip leg in the field-installed piping, installing it near the unit.
To assure sufficient gas pressure at the unit, use appropriately sized gas pipe for unit capacity.
Refer to the National Fuel Gas Code for pipe sizing information.
Select an appropriately sized gas pressure regulator to assure the required gas supply pressure
is maintained at the unit.
Required gas pressure to the gas train is 7 to 14 inches wc (0.25 to 0.5 psig) for units through
2400 MBh. Note that a minimum of 9 inches wc (0.32 psig) is required for 1250-2000 MBh
heaters with 10:1 turndown capability. For all size units, do not exceed 14 inches wc (0.5 psig)
inlet gas pressure.
Gas pressure and volume must be maintained and stable at high fire.
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