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Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-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 12.0 inches of water column
pressure. Refer to the illustrations on page 26 for details.
NOTE: A water column (W.C.) test pressure of 3.5 inches for natural gas and 10.5 inches for L.P.
(liquid propane) dryers is required at the gas valve pressure tap of each dryer for proper and
safe operation.
A 1/8" 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 gas and L.P. gas must be used.
NOTE: Test ALL connections for leaks by brushing on a soapy water solution (liquid detergent works
well).
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
ALL components/materials must conform to National Fuel Gas Code specifications, or in CANADA,
the Canadian Installation Codes. 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.
H. STEAM PIPING HOOKUP
Piping must be installed in accordance with good commercial steam system practice.
Care must be exercised when leveling steam dryers into final position. After leveling the dryer, check the
downward pitch of the heat exchanger from front to rear with a level. Likewise, check the downward pitch of
the return condensate manifold toward its outlet part. Absence of these downward pitches will result in probable
water hammer and premature heat exchanger fracture and leakage.
The presence of condensate in the steam will cause water hammer and subsequent heat exchanger failure. The
steam supply connection must be taken from the top of a well-dripped steam main. If the supply run-out to the
dryer exceeds twenty (20) feet, it should be dripped just before the control valve with a proper trap and dirt
pocket.
1.Low-Pressure (up to 15 psi) or High -Pressure (16-125 psi) Damper Models
Adherence to the following instructions is necessary to eliminate coil failures due to water hammer caused by
wet steam.