American Dryer Corp. Wet Wash ML-79 - Manual (Page 26)

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b. Gas Connections:
Inlet connection 3/4” inch N.P.T.
Inlet supply size 3/4” inch N. P.T.
Btu/hr input (per dryer) 200,000
1. Natural Gas
Regulation is controlled by the dryer’s gas valve’s internal regulator. Incoming supply pressure
must be consistent between 6 and 12 inches water column pressure.
2. Liquid Propane (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 each gas
valve pressure tap must be a consistent 11 inch water column. There is no regulator or regulation
provided in 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.
*D.M.S. (Drill Material Size) equivalent are as follows:
Natural Gas.........................#29 = .1360”
Liquid Propane Gas..............#47 = .0785”
3. Piping and Connections
ALL components and materials must conform to National Gas Code specifications. It is important that
gas pressure regulators meet applicable pressure requirement and that gas meters be rated for the total
amount of ALL the appliance BTU’s being supplied.
The dryer is provided with a 3/4” N.P.T. inlet pipe connection located at the right side of the base of the
dryer. The minimum pipe size (supply line) to the dryer is 3/4” N.P.T. For ease servicing, the gas supply
line of each dryer must have its own shut-off valve.
The size of the main gas supply line (header) will vary depending on the distance this line travels from
the gas meter or, in the case of L.P. (liquid propane) gas, the supply tank, other gas-operated appliances
on the same line, 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 pressure which will result in erratic
operation of the burner ignition system.
Type of Gas
L.P.
Conversion
Kit Part
Number
Natural Liquid Propane
Model
Number
BTU Per
Hour
Rating
Qty. D.M.S.*
Part
Number
Qty. D.M.S.*
Part
Number
ML79 WW 200,000 4 #29 4 4 #47 140805 881231