NOZZLE MIX SYSTEMS
XSA OPERATION — VARIABLE RATIO REGULATOR
This regulator is designed to cause the air/gas ratio to go progressively leaner as the air is turned from high to low pressure. The spring is adjustable up to 6 osi negative. The following table shows some typical operating conditions. "XSA" means excess air.
Negative
Regulator Outlet Gas Pressure
Air/Gas
Gas Pressure % of Air Pressure
Impulse
Setting
Pressure Ratio
16 osi
4 osi
12 osi
4-3 2-1 3-1 17-1
75 60 33
8 6
4 4 4 4
4 2
4.25
0.25
6 0
4
0
-
ADJUSTMENT 1. Set linkage for desired high and low air pressure: 16 osi to 4.25 osi. 2. Screw spring to about 2/3 of maximum negative setting. 3. Light, turn to high fire, and adjust limiting orifice for desired high fire ratio. 4. Turn to low fire and set spring for minimum gas for stable flame. 5. Turn to high and reset high fire ratio. 6. Turn to low and reset spring for low fire gas. 7. Repeat steps 5 and 6 if necessary.
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