American Dryer Corp. AD-670 - Manual (Page 38)

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C. LO-FIRE GAS SUPPLY LINE LOOP
The lo-fire gas supply line loop is a 3/4” line, which is responsible for supplying the burner system with the gas
required during lo-fire operation.
1. Adjustable Orifice - The adjustable orifice found in the lo-fire gas supply line controls the flow of gas to
the burner during lo-fire.
a. Adjustable Orifice Lo-Fire Valve Adjustment:
1) Loosen the locking nut by turning the nut counterclockwise (CCW).
2) Turn the adjustment knob clockwise (CW) to reduce gas flow through the Lo-Fire Gas Loop or
counterclockwise (CCW) to increase gas flow.
3) Retighten locking nut.