Model G3B Gas burner — Instruction manualMNG3B Gas 04101541. Prepare Site • Prepare Burner • Mount BurnerInspect installation siteInspect, repair and/or replace vent systemDo not install this burner unless you have verified the entirevent system and the appliance are in good condition andcomply with all applicable codes. And . . .The vent and chimney must be sized and constructed in ac-cordance with all applicable codes. If intended for use with anoil burner as well, the vent system must comply with relevantcodes for both gas and oil firing.The vent system must not be pressurized unless the ventpiping and vent system are designed accordingly. The ventmust provide draft at all times (negative pressure in vent).Do not install or use an existing manual damper in the ventconnector or vent.Do not connect the appliance vent connector to a chimneyor vent serving a fireplace, incinerator or solid-fuel-burningapparatus.In a cold climate, do not vent into a masonry chimneythat has one or more sides exposed to the outside. Installa listed stainless steel liner to vent the flue products.A defective vent system could result in severe personal injury,death or substantial property damage.Vent/chimney sizing• Follow all local codes when sizing the vent and chimey• Refer to the appliance manufacturer’s manual, when available, forventing recommendationsPrepare vent/chimney• Secure all metal vent joints with screws, following the vent manufactur-er’s instructions. Seal all joints in the vent system and chimney. Repairmasonry chimney lining and repair all mortar joints as needed.• Install a double-acting barometric draft regulator in the vent piping. (Thedamper must be located in the same space as the appliance.) Install amanual reset spill switch in the top of the draft regulator outlet. Wire theswitch into the appliance limit circuit to shut off the appliance/burner ifsustained downdraft should occur.• Provide support for the vent piping. Do not rest the weight of any of thevent piping on the appliance flue outlet.Figure 1 Vent and vent connector installationVerify clearances• Verify that clearances required for service/maintenance comply withthe appliance manual and applicable codes. Provide at least 6 inchesaround burner and 24 inches in front of burner panel for serviceaccess.