American Dryer Corp. ML-75DII Installation Manual download pdf (Page 34)

Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-inch (19.05 mm)

pipe gas loop be installed in the supply line servicing a bank of dryers. An in-line pressure regulator must be

installed in the gas supply line (header) if the (natural) gas pressure exceeds 12.0 inches (29.9 mb) of water

column pressure (W.C.).

NOTE: A water column test pressure of 3.5 inches (8.7 mb) for natural gas and 10.5 inches (26.1 mb)

for liquid propane (L.P.) dryers is required at the gas valve pressure tap of each dryer for

proper and safe operation.

An 1/8-inch N.P.T. plugged tap, accessible for a test gauge connection, must be installed in the main gas

supply line immediately upstream of each dryer.

IMPORTANT: Pipe joint compounds that resist the action of natural gas and L.P. gas must be used.

IMPORTANT: Test ALL connections for leaks by brushing on a soapy water solution (liquid

detergent works well).

WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!

ALL components/materials must conform to National Fuel Gas Code Specifications ANSI Z223.1-LATEST

EDITION, or in Canada, CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (L.P. Gas) or

LATEST EDITION (for General Installation and Gas Plumbing), as well as local codes and ordinances and

must be done by a qualified professional. It is important that gas pressure regulators meet applicable

pressure requirements, and that gas meters be rated for the total amount of ALL the appliance BTUs being

supplied.

IMPORTANT: The dryer and its individual shutoff valve must be disconnected from the gas supply

piping system during any pressure testing of that system at test pressures in excess of

1/2 psig (3.5 kPa).

NOTE: The dryer must be isolated from the gas supply piping system by closing its individual manual

shutoff valve during any pressure test of the gas supply system at test pressures equal to or less

than 1/2 psig (3.5 kPa).

H. STEAM INFORMATION

It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the

steam plumbing installation is adequate and conforms with local and state regulations or codes.

IMPORTANT: Failure to comply with the requirements stipulated in this manual can result in

component failure, which will VOID THE WARRANTY.

NOTE: The MLS-75 is manufactured with a pneumatic (piston) damper system, which requires an

external supply of air 80 PSI +/- 10 PSI (5.51 bars +/- 0.69) bars.

1. Steam Coil PH Level

The normal PH level for copper type steam coils must be maintained between a value of 8.5 to 9.5. For

steel type steam coils the PH level must be maintained between a value of 9.5 to 10.5. These limits are set

to limit the acid attack of the steam coils.

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American Dryer Corp. ML-75DII Installation Manual Page 34