Model G3B Gas burner — Instruction manual
MNG3B Gas 041015
4
1. Prepare Site • Prepare Burner • Mount Burner
Inspect installation site
Inspect, repair and/or replace vent system
Do not install this burner unless you have verified the entire
vent system and the appliance are in good condition and
comply 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 an
oil burner as well, the vent system must comply with relevant
codes for both gas and oil firing.
The vent system must not be pressurized unless the vent
piping and vent system are designed accordingly. The vent
must provide draft at all times (negative pressure in vent).
Do not install or use an existing manual damper in the vent
connector or vent.
Do not connect the appliance vent connector to a chimney
or vent serving a fireplace, incinerator or solid-fuel-burning
apparatus.
In a cold climate, do not vent into a masonry chimney
that has one or more sides exposed to the outside. Install
a 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, for
venting recommendations
Prepare 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. Repair
masonry chimney lining and repair all mortar joints as needed.
• Install a double-acting barometric draft regulator in the vent piping. (The
damper must be located in the same space as the appliance.) Install a
manual reset spill switch in the top of the draft regulator outlet. Wire the
switch into the appliance limit circuit to shut off the appliance/burner if
sustained downdraft should occur.
• Provide support for the vent piping. Do not rest the weight of any of the
vent piping on the appliance flue outlet.
Figure 1
Vent and vent connector installation
Verify clearances
• Verify that clearances required for service/maintenance comply with
the appliance manual and applicable codes. Provide at least 6 inches
around burner and 24 inches in front of burner panel for service
access.