American Dryer Corp. T20 User Manual

Page 18

JLA Limited

113428-9

Piping/Connections

The dryer is provided with two 3/8” N.P.T. (3/8” B.S.P.T. for CE
dryers) inlet pipe connections (1 for each tumbler) at the rear
of the dryer. If a separate feed is provided for each tumbler
from the main supply line (header), then a 1/2” (12.7 mm) line
connection is sufficient. However, if the top and bottom tumbler
connections are connected together, the supply from the
header must be increased to 3/4-inch (19.05 mm). There
should be a minimum 6-inch (15.24 cm) clearance between
the back guard and the first bend in the gas piping for ease of
servicing. It is recommended that a gas shutoff valve be
provided to the gas supply line of each dryer for ease in
servicing.
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 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.

TYPICAL NATURAL GAS INSTALLATION

NOTES ____________________________________

___________________________________________

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 13.0 in WC
(32.34 mb) pressure.
A plugged tap, accessible for a pressure gauge connection,
must be installed in the main gas supply line immediately
upstream of the dryers.

TYPICAL L.P. GAS INSTALLATION

Important

Pipe joint compounds that resist the action of
natural, L.P., and butane gases must be used.

Test all connections for leaks by brushing on a soapy water
solution (liquid detergent works well).

Warning

Never test for leaks with a flame!!!