NOZZLE MIX SYSTEMS
air
5 D
3 D
Limiting Orifice Valve-- high fire ratio adjustment (1st ratio setting)
4 pipe dia.
10 pipe dia.
Air/Gas Ratio Regulator-- low fire ratio adjustment (2nd ratio setting)
SUMMARY — PRACTICAL AIR/FUEL RATIO ADJUSTMENT The pressures mentioned previously were used to illustrate the principles of operation, and are not necessarily for practical field adjustment. 1. Set the linkage on the air control valve for the desired high and low air pressure. 2. Light the fire at low air pressure with enough gas to maintain flame. 3. Turn to high fire, adjusting the high fire ratio adjustment to keep the flame burning. 4. Set the high fire ratio adjustment for the desired air/gas ratio, using an Allen wrench on the limiting orifice valve. 5. Turn to low fire position and if needed, adjust the low fire ratio by removing the gas diaphragm cover plug and using a screwdriver to turn the spring adjusting plug. 6. If a major adjustment was necessary on low fire, return to high fire and correct the ratio again with the limiting orifice valve. 7. Recheck the low fire ratio and correct it if needed using the regulator spring adjusting plug. 8. Replace caps on the limiting orifice valve and the regulator.
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