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4. Reverse procedure for installation of new flame sensor probe.
To Replace Gas Valve (Refer to burner illustration on page 21)
1. Discontinue electrical power to the dryer.
2. Close shut-off valve(s) in gas supply line.
3. Disconnect gas valve wiring.
NOTE: Identify location of each wire for correct reinstallation.
4. Break union connection before gas valve.
5. Loosen and remove screws (4) securing pipe brackets to burner.
6. Remove gas valve/manifold assembly from dryer.
7. Remove valve mounting bracket, manifold, and piping from gas valve.
8. Reverse procedure for installing new gas valve.
WARNING: Test ALL connections for leaks by brushing on a soapy water solution.
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
To Replace Main Burner Orifices
1. Refer to To Replace Gas Valve and follow Step #1 through Step #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. Reversing the removal procedure for reinstalling.
NOTE: Test ALL connections for leaks by brushing on a soapy water solution.
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
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.