American Dryer Corp MLS-460 manual Condensate return line must be 1-1/4 pipe

3.Steam Supply and Condensate Return Connections

The steam supply into the dryer is made into the 2-1/2” F.T.P. pipe fitting located on top of the heat module console.

The maximum operating steam supply pressure is 125 psig (862 kPa).

The presence of condensate in the steam supply will cause water hammer and subsequent steam coil (battery) failure. The steam supply connection out of the main supply line must be made with a minimum 10-inch (25.4 cm) riser. This will reduce the amount of condensate in the steam supply.

Use flexible couplings at the supply and return connections. The dryer vibrates slightly when it runs and the piping connections may crack if they are hard piped to the dryer. Install shut-off valves in the supply and return lines.

An inverted bucket steam trap with an internal check valve is included with the dryer. The supply lines should be insulated. This will save energy and provide for the safety of the operator and maintenance personnel.

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 (0.08 cm) for the header. Install a bypass trap in any low point to eliminate wet steam.

The condensate return line must be 1-1/4” pipe.

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