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| TYPE OF GAS |
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Btu/hr | kcal/hr |
| Natural |
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| Liquid Propane | ||
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Rating | Rating | Qty. | D.M.S.* |
| Part No. | Qty. | D.M.S.* | Part No. |
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160,000 | 40,320 | 3 | #29 |
| 140820 | 3 | #48 | 140804 |
| Liquid Propane Conversion Kit Part Number 881598 |
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Shaded area is stated in metric equivalent |
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* Drill Measurement Size (D.M.S.) equivalents are as follows:
Natural Gas | #29 | = | 0.1360” (3.4544 mm). |
Liquid Propane Gas .. | #48 | = | 0.0760” (1.9304 mm). |
Piping/Connections
All components/materials must conform to National Fuel Gas Code Specifications ANSI
The dryer is provided with a 3/4” N.P.T. inlet pipe connection located at the rear upper left side of the dryer. The minimum pipe size (supply line) to the dryer is 3/4” diameter. For ease in 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
Note
A water column (W.C.) test pressure of 3.5 inches
!(8.7 mb) for natural gas and 10.5 inches (26.1 mb) 
for liquid propane (L.P.) dryers is required at the gas valve pressure tap of each dryer for proper and safe operation.
A 1/8” N.P.T. plugged tap, accessible for a test gauge connection, must be installed in the main gas supply line immediately upstream of each dryer.
Important
Pipe joint compounds that resist the action of natural
!gas and L.P. gas must be used.
Test all connections for leaks by brushing on a soapy water solution (liquid detergent works well).
The dryer and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).
Note
The dryer must be isolated from the gas supply piping
!system by closing its individual manual shutoff valve
during any pressure test of the gas supply system at test pressures equal to or less than 1/2 psig (3.5 kPa).
Warning
!Never test for leaks with a flame!!!
Steam Information _____________________
It is your responsibility to have all plumbing connections made by a qualified professional to ensure that the steam plumbing installation is adequate and conforms with local and state regulations or codes.
Important
Failure to comply with the requirements stipulated
!in this manual can result in component failure,
which will void the warranty.
Note
The dryer is manufactured with a pneumatic ! (piston) damper system, which requires an 
external supply of air of 0.75 cfh at 80 psi ± 10
psi (0.02 cmh at 5.52 bar ± 0.68 bar]).
Steam Coil pH Level
The normal pH level for copper type steam coils must be maintained between a value of 8.5 to 9.5. For steel type steam coils the pH level must be maintained between a value of 9.5 to 10.5. These limits are set to limit the acid attack of the steam coils.
Important
Coil failure due to improper pH level will void the
!warranty.
Steam Requirements – High Pressure
Inlet: 1” supply line connection, qty. one (1) at top manifold.
Return: 1” return line connection, qty. one (1) at bottom manifold.
12 | American Dryer Corp. |
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