Service Guide

SYSTEM OPERATION
14
When resizing any portion of the common venting system,
use the appropriate table in Appendix G in the latest edition
of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
Upow or Horizontal units are shipped with the induced
draft blower discharging from the top of the furnace (“Top”
is as viewed for an upow installation). The induced draft
blower can be rotated 90 degrees for Category I venting.
Refer to the following gure. For horizontal installations, a
four inch single wall pipe can be used to extend the induced
draft blower outlet 1/2” beyond the furnace cabinet. Vent the
furnace in accordance with the National Fuel Gas Code NFPA
54/ANSI Z223.1 - latest edition. In Canada, vent the furnace
in accordance with the National Standard of Canada, CAN/
CGA B149.1 and CAN/CGA B149.2 - latest editions and
amendments.


 R  R SRS SS   S 
  RS K    RR S 
SKS  SRS S SS R R  S  S
  R     R R
Make sure all wires are at least one inch from ue pipe.
Relocate junction box to right side of cabinet if nec essary.
Refer to Electrical Connections section of this manual for
instructions.

Wash
Crown
Clay Tile Size: 8" x 8" x12"
(Each x 24" Length)
Clay Tile Size Generally
12" x 12" (24" Length)
1/2" to 1" Air Space
Second Floor
First Floor
Attic Floor
Roof Line
Throat
Damper
Breech
Clean Out
Fan Assisted
Forced Air
Furnace
Natural Draft
Water Heater
Water Heater
Vent Connector
Basement Floor
F.A.F. Vent
Connector


This checklist serves as a summary of the items to be checked
before venting an 80% furnace into a masonry chimney. In
addition, we recommend that a qualied serviceman use
this checklist to perform a yearly inspection of the furnace
venting system.
This checklist is only a summary. For detailed information
on each of the procedures mentioned, see the paragraph
referenced with each item.
This inspection is based upon a draft topical report, “Masonry
Chimney Inspection and Relining”, issued by the Gas
Research Institute. While not yet nalized, we believe this
report represents the best information on this subject which
is currently available.