American Dryer Corp. AD-120ES - Manual (Page 27)

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2. Technical Gas Data
a. Gas Specifications
Shaded areas are stated in metric equivalents
Abbreviations: AU (Australia) and NZ (New Zealand).
* Manifold pressure is measured at the pressure tap on the outlet side of the gas valve when the valve is on.
** Unregulated L.P. kit installed. Gas valve’s internal regulator (governor) is disabled.
*** Regulated L.P. installed. Gas valve’s internal regulator (governor) is adjustable.
b. Gas Connections
Inlet connection -------------- 1” N.P.T. (1” B.S.P.T. for CE and AGA dryers)
Gas Pipe supply size -------- 1-1/4” Diameter Pipe (minimum)
Heat input -------------------- 375,000 BTU/hr (94,500 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 7.0” W.C. (17.4 mb, 1.74 kPa) and a maximum of 13.0”
W.C. (32.4 mb, 3.24 kPa) pressure. Burner manifold pressure should be 3.5” W.C. (8.7 mbar, 0.87
kPa); adjust if necessary.
2) L.P. Gas (Unregulated)
Dryers made for use with unregulated 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 in WC (26.1 mb, 2.61 kPa).
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.
3) L.P. Gas (Regulated)
Regulation is controlled by the dryer’s gas valve’s internal regulator. Incoming supply pressure
must be consistent at 11.0” W.C. (27 mbar, 2.7 kPa). Burner manifold pressure should be 8.8”
W.C. (22 mbar, 2.2 kPa); adjust if necessary.
Rating
375,000 BTU/hr
94,500 kCal/hr
395.6 MJ/hr
Manifold Pressure * In-Line Pressure Orifice
Inches W.C. mbar kPa Inches W.C. mbar kPa Qty. DMS mm
Gas
Type
Natural Gas
3.5 8.7 0.87 7.0-13.0 17.4-32.4 1.74-3.24 3 #4 5.309
Natural Gas (AU / NZ)
L.P. Gas ** 10.5 26.2 2.62
11.0 27.4 2.74 3 #30 3.264
L.P. Gas (AU / NZ) *** 8.8 22.0 2.20