American Dryer Corp. AD-20 - Manual (Page 25)

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2. Technical Gas Data
a. Gas Specifications
* 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.
* 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).
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
TYPE OF GAS
L.P.
Conversion
Kit
Part Number
ADC
MODEL
NUMBER
BTU
Per Hour
Rating
kcal/hr
Rating
Natural Liquid Propane
Qty. D.M.S.*
Part
Number
Qty. D.M.S.*
Part
Number
AD-20 40,000 10,080 1 #31 140868 2 #49 140869 883610
Shaded area is stated in metric equivalent