American Dryer Corp. AD-75 - Manual (Page 35)

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2. Steam Requirements - High Pressure
Inlet -------- 1" supply line connection -- qty. one (1) at top manifold
Return ----- 1" return line connection -- qty. one (1) at top manifold
3. Installation Instructions
To insure an adequate supply of steam is provided, be sure that the steam lines and steam return lines
are sized and laid out as stipulated in this manual. Inadequate steam lines and steam return lines or
improper steam plumbing will result in poor performance and can cause component failure. Clean,
dry steam must be provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam will
VOID THE WARRANTY.
a. The pressure of the condensate in the steam supply will cause water hammer and subsequent heat
exchanger (steam coil) failure. The steam supply connection into the main supply line must be
made with a minimum 10-inch riser. This will prevent any condensate from draining towards the
dryer.
b. 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 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. 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.
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* Minimum operating pressure for optimum drying results.