NOZZLE MIX SYSTEMS
XSA OPERATION — FULL AIR PRESSURE-CONTROLLED IMPULSE
ADJUSTMENT 1. Open main air valve wide. 2. Close curtain in adjustable port valve, turn control arm to closed position, and open "orifice" if adjustable. 3. Light burners and adjust high gas flow with limiting orifice(s). 4. Turn control arm to open position. 5. If "orifice" is fixed, open curtain until desired low gas flow is reached. If "orifice" is adjustable, close it about half-way and open curtain until desired low gas flow is reached. 6. Turn control arm to closed position, and then open until pressure at gauge "A" in impulse line or at regulator outlet drops 1 to 2 osi. Mark position of valve arm. If no gauge is available, drop in pressure will be indicated by fire getting leaner. 7. Readjust limiting orifice(s) for desired high fire ration. 8. Set adjustable port valve linkage to control from wide open to position determined in step 6.
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