NOZZLE MIX SYSTEMS
Remove burrs from the inside. To minimize turbulence effects, locate the connection on the air line at least 5 air pipe diameters downstream and 3 diameters upstream of any valve or fitting. If it is absolutely necessary to locate the connection less than 5 diameters downstream of the control valve, the hole should be drilled so that the drill is parallel to the shaft of the valve.
INSTALLATION FOR PREMIX BURNERS
1. For an open type premix burner, remove the thread protection cap from the vent and leave open to the furnace room atmosphere as shown in Figure 1. If the vent is piped outdoors, protect the end of the vent pipe from air currents, water, and dirt. 2. For a sealed-in type premix burner the vent of the 7218 Atmospheric Regulator should be cross-connected to the combustion chamber to correct the regulator action for any difference between furnace and atmospheric pressure. When one regulator is used for each burner, connect the vent through the burner mounting plate (as in figure 2) or to the combustion area.
Control Valve
air
Mixer
gas
Open Register Premix Burner
Figure 1
Air/Gas Ratio Regulator
Control Valve
Sealed-in Premix Burner
air
Mixer
gas
Figure 2
Air/Gas Ratio Regulator
26
Made with FlippingBook - Online catalogs