28 American Dryer Corp. 112144-46
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 liquid propane [L.P.] gas, the supply tank), the number of tees, other gas-operated
appliances on the 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 3/4” (19.05 mm) pipe
loop be installed in the supply line servicing the bank of dryers. An in-line pressure regulator must be installed
in the gas supply line (header) if (natural) gas line pressure exceeds 12.0 inches (29.9 mb) water column (W.C.)
pressure. Refer to the illustration on page 29 for details.
IMPORTANT: Water column pressure of 3.5 inches (8.7 mb) for natural gas dryers and 10.5 inches
(26.1 mb) for L.P. gas is required at the gas valve pressure tap of each dryer for proper
and safe operation.
A 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 gas and L.P. gas must be used.
WARNING: Test ALL connections for leaks by brushing on a soapy water solution (liquid detergent
works well).
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
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