American Dryer Corp. AD-75 - Manual (Page 34)

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Consistent gas pressure is essential at ALL gas connections. It is recommended that a 3/4-inch pipe
gas loop be installed in the supply line serving 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 of water
column pressure.
NOTE: A water column test pressure of 3.5-4.0-inches for natural gas and 11.0-inches for L.P.
(liquid propane) dryers is required at the gas valve pressure tap of each dryer for proper
and safe operation.
A 1/8" 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 Gas Code specifications. 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 BTU's being supplied.
IMPORTANT: The dryer and its individual shut-off 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 shut-off 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 gas 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 ADS-75 is manufactured with a pneumatic (piston) damper system which requires
an external supply of air (80 PSI +/- 10 PSI).
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.
IMPORTANT: Coil failure due to improper PH level will VOID THE WARRANTY.