American Dryer Corp. Super AD-30 - Manual (Page 29)

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2. Technical Gas Data
a. Natural Gas
The natural gas supply pressure to the dryer must be between 6 and 12 inches water column. If the
pressure is too low, ignition failure and/or slow drying time may result. Excessively high supply pressure
will result in erratic operation of the gas valve's internal pressure regulator. The pressure measured at the
pressure tap on the body of the gas valve must be 3.5 inches water column (W.C.).
b. Liquid Petroleum (L.P.) Gas
Dryers made for use with L.P. gas have the gas valve's internal pressure regulator blocked open so that the
gas pressure must be regulated upstream of the dryer. The pressure measured at the gas valve body
pressure tap must be 10.5 inches water column (W.C.). There is no regulator provided on an L.P. dryer.
The water column pressure must be regulated at the source (L.P. tank), or an external regulator must be
added to each dryer.
3. Piping/Connections
The SUPER AD-30 dryer is provided with a 3/4" N.P.T. inlet pipe connection extending out the rear area of
the dryer. For ease of servicing, the gas supply line of each dryer should have its own shut-off valve.
IMPORTANT: The gas pipe supply line to each dryer must be a minimum of 3/4". DO NOT
REDUCE THIS PIPE SIZE REQUIREMENT.
The size of the gas supply line (header) will vary depending on the distance this supply line travels from the
gas meter or, in the case of L.P. gas, the supply tank, the number of tees, other gas-operated appliances, etc.
Specific information regarding supply line size should be determined by the gas supplier.
NOTE: Undersized gas supply piping can create a low or inconsistent gas pressure which will result in
erratic operation of the burner ignition system.