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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. [liquid propane] 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” pipe loop be
installed in the supply line serving 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 water column pressure - 29.2
millibars. (Refer to the illustration on page 22 for details.)
IMPORTANT: Water column pressure of 3.5 inches (8.7 millibars) for natural gas dryers and 10.5
inches (26.1 millibars) 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
also works well).
WARNING: NEVER TEST FOR GAS LEAKS WITH AN OPEN FLAME!!!