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3. Piping and Connections
ALL
components and materials
must conform
to National Fuel Gas Code, or in Canada, the 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. (liquid propane) 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 (2.54 cm)
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
(29.9 mb) pressure.
IMPORTANT:
A consistent water column pressure of 3.5 inches (8.7 mb) for natural gas and 10.5
inches (26.1 mb) 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, or in Canada, the 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.
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).
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