American Dryer Corp. ADG-385 User Manual

Page 24

To Test and Adjust Gas (Water Column) Pressure

There are two (2) types of devices commonly used to measure water column pressure. They are spring/

mechanical-type gauges and manometers. 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 P/N: 122804

1. To Test Gas Water Column (W.C.) Pressure:

a. Connect water column test gauge connection

to gas valve pressure tap (1/8" NPT). 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 to 4 Inches Water Column

L.P. Gas 10.5 to 11 Inches Water Column

2. To adjust water column pressure: For Natural gas

models remove vent cap. Turn the slotted adjustment

screw located on top of the valve next to the terminals.

Turn clockwise to increase manifold pressure and counter

clockwise to decrease. For L.P. gas models there is no

regulator on valve.

NOTE: If correct W.C. pressure cannot be achieved, problem may be due to an undersized gas

supply line, a faulty or underrated gas meter, etc.

To Replace Main Burner Orifices

(See Chart On Following Page)

1. Refer to "TO REPLACE GAS VALVE" and follow steps one (1) through six (6).

2. Unscrew main burner orifices and replace.

NOTE: Use extreme care when removing and replacing orifices. These orifices are made of

brass and are easily damaged.

3. Reverse the removal procedure for re-installing.

WARNING: Test ALL connections for leaks by brushing on a soapy water solution.

"Never Test For Leaks With A Flame".