American Dryer Corp. ML-75DII - Manual (Page 36)

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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 (6.35 mm)
for every 1 foot (0.31 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.
IMPORTANT: Flexible hose/coupling must be used. Coil failure due to hard plumbing connections
will VOID THE WARRANTY.
4. Steam Damper Air System Connections
The MLS-75 is manufactured with a pneumatic (piston) damper system, which requires an external supply
of compressed air. The air connection is made to the steam damper solenoid valve, which is located at the
rear inner top area of the dryer just in front of the electric service relay box.