PREMIX SYSTEMS
gas adjustment valve cartridge (self-contained)
turn gas adjustment plug clockwise to decrease gas
gas pipe connection can be either left-hand or righ-hand by reversing cartridge
remove cap to make gas adjustment
INSTALLATION AND LIGHTING OF PREMIX SYSTEMS
3065 Aspirator Mixers can be mounted in any position convenient to the user's piping. The gas adjustment valve cartridge is self-contained and can be mounted in either side of the mixer. Gas piping is perpendicular to the air line. It is satisfactory to use one mixer for two or more burners, but flow distribution and pressure drops should be considered carefully when designing the manifold. When mounting an Aspirator Mixer, allow side clearance for Allen wrench setting of the gas adjustment valve. All mixers are shipped with the gas adjustment valve closed and with right-hand assembly as shown. Plugged taps ( 1/8 ") are provided for pressure readings. To light the burner(s): Follow blower instructions to start the blower. All gas lines up to the 7218 Regulator must be purged. Before lighting any pilot or burner, purge the firing chamber - see Step 1, page 52. Follow pilot instructions to light the pilot(s). Set the main air valve at low fire position (1 or 2 osi air pressure). Open the gas adjustment valve 3 or 4 turns. Open the upstream gas shutoff valve(s) and the individual gas valve for one burner. If the burner does not light in a few seconds, close the nearest upstream gas shutoff valve (to prevent accumulation of unburned gas) and purge the chamber allowing sufficient time for a minimum of four changes of atmosphere. Then open the gas adjustment valve one more turn and reopen the shutoff valve. Repeat the procedure until the main flame lights.
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