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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 Inches Water Column - 8.7 mb.
L.P. Gas - 10.5 Inches Water Column - 26.1 mb.
2. To adjust water column pressure (natural gas only, 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.
To Convert Natural Gas to L.P. Gas
NOTE: ALL dryers are sold as natural gas, unless otherwise specified at the time the dryer order was
placed. For L.P. gas the dryer must be converted as follows.
1. Refer to “Replace Gas Valve” and follow Step #1 through Step #6.
a. Remove top vent cap.
b. Insert spring and pin.
c. Replace vent cap.
2. Unscrew main burner orifices and replace with L.P. orifices.
NOTE: Use extreme care when removing orifices. They are made of brass and are easily damaged.
3. Reverse the procedure for reinstalling valve assembly to the dryer.
WARNING: Test ALL connections for leaks by brushing on a soapy water solution.
WARNING: NEVER TEST FOR LEAKS WITH A FLAME!!!
NOTE: There is no regulator provided in an L.P. dryer. The column pressure must be regulated at the
source (L.P. tank) or an external regulator must be added to each dryer.