American Dryer Corp. 30 lb. Stacked Models - Manual (Page 17)

Natural Gas
Regulation is controlled by each gas
valve's internal regulator. Incoming
supply pressure must be consistently
between a minimum of 6.0 inches and a
maximum of 12.0 inches water column
pressure.
Liquid Propane (L.P.) Gas
Dryers made for use with L.P. gas have
the
gas valve's pressure regulators
blocked open so that the gas pressure
must be regulated upstream of the dryer.
The pressure measured at each gas valve
body pressure tap must be a consistent
10.5 inches water column. There is no
regulator provided in an L.P. dryer. The
water column pressure must be regulated
at the source (L.P. tank), or an external
regulator must be added to each dryer.
Piping/Connections
All components/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 one common
3/4" N.P.T. inlet pipe connection. It is
recommended that a gas shut-off valve
serving each dryer be provided for ease
in servicing.
The size of the gas supply line (header)
will vary, depending on the distance this
supply line travels from the gas meter (or
in the case of L.P. 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 gas 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. (Refer to illustration on
page 16 for details.)
IMPORTANT: Water column pressure of
4.0 inches for natural gas dryers and 10.5
inches 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 tapping, 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: TEST ALL CONNECTIONS FOR
LEAKS BY BRUSHING ON A SOAPY
WATER SOLUTION (LIQUID DETERGENT
ALSO WORKS WELL). NEVER TEST FOR
GAS LEAKS WITH AN OPEN FLAME.
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