Filter
Top Products
43
B. TESTING AND ADJUSTING GAS PRESSURE
There are two (2) types of devices commonly used to measure water column
pressure. They are spring/mechanical-type gauge and manometer. The spring/
mechanical-type gauge
is not recommended, because it is easily damaged and
not always accurate. A manometer is simply a glass or transparent plastic tube
with a scale in inches. When filled with water and pressure applied, the water
in the tube rises showing the exact water column pressure.
NOTE: Manometers are available from the factory by ordering ADC
Part No. 122804.
1. To Test Gas Water Column Pressure:
a. Connect water column test gauge connection to gas valve pressure
tap (1/8” N.P.T.). This pressure tap is located on the outlet (manifold)
side of the valve.
b. Start dryer. With burner on, the correct water column reading in inches
would be:
Natural Gas ..................................... 3.5 Inches (8.7 mb) water column.
Liquid Propane (L.P.) Gas .............. 10.5 Inches (26.1 mb) water column.
2. To Adjust Water Column (W.C.) Pressure (natural gas only, liquid propane [L.P.] gas must be regulated at
source):
a. Remove the slotted vent cap on the top of the valve.
b. Turn the slotted adjustment screw located on the top of the valve next to the terminals. Turn clockwise
(CW) to increase manifold pressure and counterclockwise (CCW) to decrease.
NOTE: If correct water column pressure cannot be achieved, problems may be due to an undersized
gas supply line, a faulty or underrated gas meter, etc.