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24 American Dryer Corp. 113386-14
3. Piping/Connections
ALL components/materials must conform to National Fuel Gas Code Specifications ANSI Z223.1-LATEST
EDITION, or in Canada, CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (L.P. Gas)
or LATEST EDITION (for General Installation and Gas Plumbing), as well as local codes and ordinances
and must be done by a qualified professional. 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 being
supplied.
The dryer is provided with a 1” N.P.T. (1” B.S.P.T. for CE and AGA dryers) inlet pipe connection extending
out the back area of the burner box. The minimum pipe size connection (supply line) to the dryer is 1-1/4”
diameter. For ease of servicing, the gas supply line of each dryer must have its own shutoff 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 (2.54 cm)
pipe gas loop be installed in the supply line servicing a bank of dryers. An in-line pressure regulator must
be installed in the gas supply line (header) if the (natural) gas pressure exceeds 13.0 in WC (32.4 mb, 3.24
kPa) pressure.
IMPORTANT: A water column pressure of 3.5 in WC (8.7 mb, 0.87 kPa) for natural gas and 10.5
inches (26.1 mb, 2.61 kPa) for unregulated L.P. dryers, and 8.8 inches (22 mb, 2.2 kPa) for
regulated L.P. dryers is required at the gas valve pressure tap of each dryer for proper and safe
operation.
An 1/8” 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 LEAKS WITH A FLAME!!!
IMPORTANT: The dryer and its individual shutoff 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 psig (3.5
kPa).
NOTE: The dryer must be isolated from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of the gas supply piping system at test pressures
equal to or less than 1/2 psig (3.5 kPa).
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