American Dryer Corp. AD-758 - Manual (Page 59)

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C. USING A MANOMETER
How To Use A Manometer
1. With dryer in nonoperating mode, remove plug on the gas valve pressure tap.
2. Attach plastic tubing to pressure tap. Fitting is supplied with manometer (refer to the illustration below).
3. Attach manometer to the dryer using magnet.
NOTE: Place manometer in a position so that readings can be taken at eye level.
4. Fill manometer with water, as shown in the illustration, to the zero level.
5. Start dryer. With burner on, take a reading.
a. Read water level at the inner tube. Readings
should be taken at eye level.
b. Correct readings should be :
Natural Gas: 3.5 inches (8.7 mb) water column
(W.C.).
Liquid Propane (L.P.) Gas: 10.5 inches (26.1
mb) water column.
6. If water column pressure is incorrect refer to “TO
ADJUST GAS PRESSURE.”
7. Reverse procedure for removing manometer.