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Consistent gas pressure is essential at
ALL gas connections. It is recommended that a 3/4-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.
Refer to the illustrations on the previous page (
page 25).
NOTE: A water column test pressure of 3.5 inches for natural gas and 10.5 inches for L.P. (liquid
propane) 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 gas and L.P. gas 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!
ALL components and materials must conform to National Gas Code or Canadian Gas specifications. 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.
IMPORTANT: The dryer and its individual shut-off 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
shut-off valve during any pressure test of the gas supply system at test pressures equal to or less
than 1/2 psig (3.5 kPa).