American Dryer Corp AD-20 installation manual Type of GAS

2.Technical Gas Data a. Gas Specifications

	TYPE OF GAS
	NATURAL		LIQUID PROPANE
Manifold Pressure*	3.5 inches W.C.	8.7 mb	10.5 inches W.C.	26.1 mb
In-Line Pressure	6.0 - 12.0 inches W.C.	14.92 - 29.9 mb	11.0 inches W.C.	27.4 mb

Shaded areas are stated in metric equivalents

*Measured at outlet side of gas valve pressure tap when gas valve is on.

b.Gas Connections

Inlet connection ------------- 3/8” N.P.T.

Inlet supply size ------------- 3/8” N.P.T. (minimum) Btu/hr input (per dryer) ---- 40,000 (10,080 kcal/hr)

1)Natural Gas

Regulation is controlled by the dryer’s gas valve’s internal regulator. Incoming supply pressure must be consistent between a minimum of 6.0 inches (14.92 mb) and a maximum of 12.0 inches (29.9 mb) water column (W.C.) 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 10.5 inches (26.1 mb) 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.

				TYPE OF GAS						L.P.
										Conversion
ADC	BTU	kcal/hr		Natural			Liquid Propane
										Kit
MODEL	Per Hour				Part				Part
		Rating	Qty.	D.M.S.*		Qty.		D.M.S.*		Part Number
NUMBER	Rating				Number				Number
AD-20	40,000	10,080	1	#31	140868	2		#49	140869	883610

Shaded area is stated in metric equivalent

* Drill Material Size (D.M.S.) equivalents are as follows:

Natural Gas	#31 = 0.1200” (3.048 mm).
Liquid Propane Gas	#49 = 0.0730” (1.8542 mm).

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