American Dryer Corp. AD-202, Operation Manual, Page: 37 / 62

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b. The steam supply line to the dryer must include a 12-inch (30.48 cm) riser along with a drip trap and
check valve. This will prevent any condensate from entering the steam coil.
c. Flexible hoses or couplings must be used. The dryer vibrates slightly when it runs and this will cause
the steam coil connections to crack if they are hard piped to the supply and return mains.
d. Shutoff valves for each dryer should be installed in the supply line, return line, and drip trap return line.
This will allow the dryer to be isolated from the supply main and the return main if the dryer needs
maintenance work.
e. Install an inverted bucket steam trap and check valve at least 12-inches (30.48 cm) below the steam
coil return manifold as close to the coil as possible.
1) An inverted bucket steam trap with a capacity of 1,080 lb (491 kg) of condensate per hour @ 125
psi (8.62 bar) are required for each dryer.
f. A 3/4-inch (19.05 mm) vacuum breaker should be installed. This will save energy and provide for the
safety of the operator and maintenance personnel.
g. Dryers with Optional Steam Solenoid Valve: Mount steam solenoid valve in orientation shown, with coil
up. The supply line should be supported to prevent damage to the steam coil due to the overhung weight
of the steam solenoid valve.
h. Water pockets in the supply lines, caused by low points, will provide wet steam to the coil possibly
causing steam coil damage. ALL horizontal runs of steam supply piping should be pitched 1/4-inch
(6.35 mm) for every 1 foot (0.30 meters) back towards the steam supply header causing the condensate
in the line to drain to the header. Install a bypass trap in any low point to eliminate wet steam.
Piping Diagram for Steam Coil