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3. PIPING AND CONNECTIONS
ALL components and materials must conform to national fuel gas code 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.
The dryer is provided with a 1 inch N.P.T. inlet pipe connection extending out the back area of the burner box.
The minimum pipe size connection (supply line) to the dryer is one inch N.P.T. For ease of serving, the gas
supply line of each dryer must have its own shut-off 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 L.P. gas, the supply tank, other gas-operated appliances on the same 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 one 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 inches of water column pressure.
IMPORTANT: A consistent water column pressure of 3.5 inches for natural gas and 10.5 inches for
liquid propane dryers is required at the gas valve pressure tap of each dryer for proper and
safe operation.
A 1/8 inch 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.
WARNING: NEVER TEST FOR GAS LEAKS WITH A FLAME.
ALL components and materials must conform to National Fuel Gas Code Specifications ANSI Z223.1-
LATEST EDITION. It is important that gas pressure regulators meet applicable pressure requirements, and
gas meters be rated for the total amount of appliance but'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 testing of the gas supply piping system at test pressures equal to or less
than 1/2 psig (3.5 kpa).