NOZZLE MIX SYSTEMS
air
0.5 osi
5 D
3 D
Manual Valve
to other burners
Burner
impulse line
4 pipe dia.
gas
Limiting Orifice Valve
10 pipe dia.
0.5 osi
0.5 osi
low fire ratio adjustment
ADJUSTMENT OF AIR/FUEL RATIO AT LOW FIRE RATE
After the high fire ratio is set, turn the air to the low fire pressure (about 0.5 osi). If more or less gas is required at this position, the low fire ratio may be adjusted by changing the compression of the regulator spring. (See step 3, page 29)
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