American Dryer Corp. Phase 6 Microprocessor Controls ML-190HS - Manual (Page 61)

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C. 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 (refer to 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 with water, as shown in
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 W.C.
L.P. GAS: 10.5 Inches W.C.
6. If water column pressure is incorrect refer to
“TO ADJUST GAS PRESSURE.”
7. Reverse procedure for removing manometer.