American Dryer Corp. AD/ML-310 - Manual (Page 33)

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Consistent gas pressure is essential at ALL gas connections. It is recommended that a 2-inch (5.08 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 12.0 inches (29.9 mb) of water column pressure.
IMPORTANT: A water column pressure of 3.5 inches (8.7 mb) for natural gas or 10.5 inches (26.1 mb)
for liquid propane (L.P.) gas dryers 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 and L.P. gases must be used.
IMPORTANT: Test ALL connections for leaks by brushing on a soapy solution (liquid detergent works
well).
WARNING: NEVER TEST FOR GAS 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).