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3. Piping and Connections
ALL components and materials must conform to National Fuel or Canadian 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 1-inch N.P.T. For ease of servicing, 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 1-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 (W.C.) pressure.
IMPORTANT: A water column (W.C.) pressure of 3.5 inches for natural gas and 10.5 inches
for L.P. 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.
IMPORTANT: Test ALL connections for leaks by brushing on a soapy water solution (liquid
detergent works well).
WARNING: NEVER TEST FOR GAS LEAKS WITH A FLAME!!!
ALL components and materials must conform to National Fuel or Canadian 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 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 (3.5kPa).
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 (3.5kPa).