Chimney Requirements; Installing The Burner - Heat Wise SU-3 Manual

The chimney should extend at least 3' above a flat roof or the highest roof ridge (see Fig. 2) and
be free in a radius of 30' of objects such as tree limbs, other buildings, etc, which may cause a down
draft. The chimney should be lined as required by the local Gas utility or local codes. Some utilities
require new chimney liners for all gas installations. Use a corrosion resistant chimney liner (approved for
gas service) of the same size as the vent pipe.
Fig. 2 Chimney and Fresh Air Dimensions
Install the burner on the unit and then tighten the nuts on the flange so that the burner is permanently
secured. Seal off any free openings with high temperature cement.

Chimney Requirements

Installing the Burner

First, install the gasket and boiler flange to the boiler. For
heat exchangers with a square stud pattern, one allen screw on the
flange should be on the top, slightly to the right of the 12 o'clock
stud. The second screw should be on the left (slightly above the 9
o'clock position stud). Tighten all the nuts equally. Make sure that
the allen screws are backed out, to allow enough clearance. Then,
insert the SU-3/SU-4 gas burner into the boiler.
Once the burner is inserted and pushed all the way forward,
tighten the allen screw on the top of the flange. This screw MUST
go into the groove that is on the burner housing.
Tighten the second allen screw, located on the right side of
the flange. This screw should be tight.
Seal off any free openings with either high temperature cement or
high temperature silicone
Picture 5: BODY FLANGE:
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