American Dryer Corp. AD-400 - Manual (Page 21)

2. The steam supply piping to the dryer must include a 12-inch rise, along with a drip trap and check
valve. This will prevent any condensate from entering the steam coils.
3. 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.
4. Manual Shut-off valves for each dryer should be installed in the supply, return, and drip trap return
lines. This will allow the dryer to isolated from the supply and return mains if the dryer needs
maintenance work.
5. Install an inverted bucket steam trap and check valve at least 12 inches below the steam coils and as
near to the coils as possible.
6. A vacuum breaker should be installed in the supply piping as near to the coils as possible. This will
prevent the condensing steam from causing a vacuum inside the coils possibly damaging them.
7. The supply and return lines should be insulated. This will save energy and provide for the safety of
the operator and maintenance personnel.
8. Water pockets in the supply line, caused by low points, will provide wet steam to the coil possibly
causing coil damage. All horizontal runs of steam supply piping should be pitched 1/4 inch every foot
back towards the steam supply header, causing any condensate in the line to drain to the header.
Install a bypass trap in any low point to eliminate wet steam.
7. Sprinkler Water Supply
A 40 psi supply of water must be connected into the 1-inch MPT sprinkler connection located on the left
side of the base.
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