Chimney Requirements - 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.
First, install the gasket and boiler flange to the boiler. For heat
exchangers with a diamond stud pattern, one allen screw on the flange
should be on the top, slightly to the left of the 12 o'clock stud. The
second screw should be on the right (slightly above the 3 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-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.

Chimney Requirements

Fig. 2 Chimney and Fresh Air Dimensions
Picture 5: BODY FLANGE:
5