American Dryer Corp. Gas/Electric/Steam AD-75HS, Installation Manual

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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. Shut-off 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 below the steam coil as close to
the coil as possible.
1) A trap with capacity of 700 pounds of condensate per hour at 125 psi is needed for each unit.
f. The supply line and the return line should be insulated. This will save energy and provide for the safety
of the operator and maintenance personnel.
g. Water pockets in the supply line, 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 for every one
(1) foot 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.
IMPORTANT : Flexible hose/coupling must be used. Coil Failure due to hard plumbing connections
will VOID THE WARRANTY.