American Dryer Corp. ADG-385 - Manual (Page 53)

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B. Using A Manometer
How To Use A Manometer
1. With dryer in non-operating mode remove plug
on the gas valve pressure tap.
2. Attach plastic tubing to pressure tap. (fitting is
supplied with manometer see illustration.)
3. Attach manometer to dryer using magnet.
NOTE: Place manometer in a position so that
readings can be taken at eye level.
4. Fill manometer as shown in illustration to the
zero (0) 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 - 4.0 inches w.c.
L.P. GAS: 11 -10.5 inches w.c.
6. If water column pressure is incorrect refer to
"To Adjust Gas Pressure"
7. Reverse procedure for removing manometer.