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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) W.C. 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.
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| TYPE OF GAS |
| Liquid | ||||
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| Propane |
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| Natural |
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| Liquid Propane | |||
Btu/hr | kcal/hr |
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| Conversion Kit | ||||
Rating | Rating | Qty. | D.M.S.* |
| Part No. | Qty. | D.M.S.* | Part No. | Part Number |
270,000 | 68,040 | 4 | #23 |
| 140856 | 4 | #41 | 140811 | 882119 |
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Shaded area is stated in metric equivalent
* Drill Measurement Size (D.M.S.) equivalents are as follows:
Natural Gas | #23 | = | 0.154” (3.9116 mm). |
Liquid Propane Gas | #41 | = | 0.096” (2.4384 mm). |
3.Piping and Connections
ALL components/materials must conform to National Fuel Gas Code Specifications ANSI
The dryer is provided with a 1” N.P.T. inlet pipe connection extending out the back area of the burner box. The minimum pipe size connection (supply line) to the dryer is 1” diameter. For ease of servicing, the gas supply line of each dryer must have its own shutoff 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. gas, the supply tank, other
NOTE: Undersized gas supply piping can create a low or inconsistent pressure, which will result in erratic operation of the burner ignition system.
Consistent gas pressure is essential at ALL gas connections. It is recommended that a
IMPORTANT: A consistent W.C. pressure of 3.5 inches (8.7 mb) for natural gas and 10.5 inches (26.1 mb) for L.P. dryers is required at the gas valve pressure tap of each dryer for proper and safe operation.
20 | American Dryer Corp. | 113344 - 9 |