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3. Piping/Connections
ALL components/materials must conform to National Fuel Gas Code Specifications, or in CANADA, the
Canadian Installation Codes (for General Installation and Gas Plumbing). It is important that gas pressure
regulators meet applicable pressure requirements and that gas meters be rated for the total amount of all the
appliance Btu's being supplied.
The dryer is provided with a 1-inch N.P.T. inlet pipe connection extending out the back area of the burner box.
The minimum pipe size connection (supply line) to the dryer is 1-inch N.P.T. For ease of servicing, the gas
supply line of each dryer must have its own shut-off valve.
The size of the main gas supply line (header) will vary depending on the distance this line travels from the gas
meter or, in the case of L.P. gas, the supply tank, other gas-operated appliances on the same supply line, etc.
Specific information regarding supply line size should be determined by the gas supplier.
NOTE: Undersized gas supply piping can create a low or inconsistent pressure which will result
in erratic operation of the burner ignition system.
Consistent gas pressure is essential at ALL gas connections. It is recommended that a 1-inch pipe gas loop be
installed in the supply line serving a bank of dryers. An in-line pressure regulator must be installed in the gas
supply line (header) if the (natural) gas pressure exceeds 12.0 inches of water column pressure.
IMPORTANT: A water column pressure of 3.5 to 4.0 inches for natural gas and 11.0 inches for
L.P. dryers is required at the gas valve pressure tap of each dryer for proper and
safe operation.
A 1/8-inch N.P.T. plugged tap, accessible for a test gauge connection, must be installed in the main gas supply
line immediately upstream of each dryer.
IMPORTANT: Pipe joint compounds that resist the action of natural and L.P. gases must be
used.
IMPORTANT: Test ALL connections for leaks by brushing on a soapy water solution
(liquid detergent works well).
WARNING: NEVER TEST FOR GAS LEAKS WITH A FLAME!!!
ALL components/materials must conform to National Fuel Gas Code Specifications ANSI Z223.1-LATEST
EDITION, or in CANADA, the Canadian Installation Codes CAN/CGA-B149.1-M91 (Natural Gas) or CAN/
CGA-B149.2-M91 (L.P. Gas) or LATEST EDITION.
It is important that gas pressure regulators meet applicable pressure requirements, and that gas meters be rated
for the total amount of appliance Btu's being supplied.