AIR/GAS RATIO REGULATOR
AIR/GAS RATIO REGULATOR
Air/Gas Ratio Regulator Axis 1218 regulators accurately maintain a constant air/gas ratio over a wide range of firing rates in both nozzle-mix and premix gas burner systems. CAPACITIES Cfh With 2 OSI drop through regulator gas gravity
REGULATOR DESIGNATION |
0.4 |
0.6 |
1.5 |
2.0 |
|---|---|---|---|---|
| 1218-0 | 300 | 250 | 150 | 135 |
| 1218-1 | 500 | 400 | 250 | 225 |
| 1218-2 | 1000 | 800 | 500 | 450 |
| 1218-3 | 1500 | 1200 | 775 | 675 |
| 1218-4 | 3000 | 2400 | 1500 | 1350 |
| 1218-5 | 5000 | 4000 | 2500 | 2250 |
| 1218-6 | 7350 | 6000 | 3800 | 3300 |
| 1218-7 | 13400 | 11000 | 7000 | 6000 |
NOZZLE – MIX BURNERS
When used with nozzle-mix burners, the vent of a 1218 regulator is cross-connected to the main air line down stream of the control valve. Regulator outlet pressures then equal air impulse pressures, and gas flow remains proportional to air flow at all firing rates.
One regulator can be used for several burners controlled by the same air valve, but often it is better to have a separate regulator for each burner.
DUAL-FUEL BURNER
When a dual-fuel burners atomizing air is left on during gas operation, the 1218 regulator can be set to compensate for the extra air (over the controlled main air) by adjusting the spring for up to OSI “leak” with no impulse pressure.
PREMIX BURNERS
With its vent open to atmosphere, a 1218 regulator can be used as an atmospheric, regulator (zero governor) to supply gas to an aspirator mixer feeding premix burners.
If burners nozzles are sealed-in and furnace pressure is other than atmospheric, regulator vent must be connected to combustion chamber. Controlled “Zero” gas pressure then will match furnace pressure, this is necessary to maintain the same air/gas ratioat all firing rates. (See instruction 1218) A separate regulator for each mixer is preferred to avoid interference or interaction.