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The dryer is provided with a 3/4” N.P.T. inlet pipe connection located at the upper left rear of the dryer.
The minimum pipe size (supply line) to the dryer is 3/4” diameter. For ease in 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 liquid propane (L.P.) gas, the supply tank, other gas-operated appliances on the
same 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-inch (19.05
mm) 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 (W.C.) pressure.
NOTE: A water column test pressure of 3.5 inches (8.7 mb) for natural gas and 10.5 inches (26.1 mb)
for L.P. 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.