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450268-1 www.amdry.com 21
TO REPLACE GAS VALVE
1. Discontinue power to the dryer.
2. Close shutoff valve in the gas supply line.
3. Disconnect the gas valve wiring.
4. Break union connection before gas valve.
5. Loosen and remove two (2) screws
securing pipe bracket to the burner.
6. Remove gas valve/manifold assembly
from the dryer.
7. Remove manifold from outlet of the gas valve.
8. Remove union tailpiece from valve. Use a 1/2” Allen wrench (ADC Part No. 410001).
9. Reverse procedure for installing the new gas valve.
WARNING: Test ALL connections for leaks by brushing on a soapy water solution (liquid
detergent works well).
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 #6
.
2. Unscrew main burner orifices and replace.
NOTE: Use extreme care when removing and replacing orifices. THESE ORIFICES
ARE MADE OF BRASS, WHICH IS EASILY DAMAGED.
3. Reverse the removal procedure for reinstalling.
WARNING: Test ALL connections for leaks by brushing on a soapy water solution (liquid
detergent works well).
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
TO TEST AND ADJUST GAS (WATER COLUMN [W.C.]) 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, which when filled with water and pressure is applied, the water in the
tube rises, showing the exact water column pressure.