11
To rotate the induced draft blower counterclockwise, proceed as
follows:
1. Disconnect electrical power from the furnace.
2. Disconnect the induced draft blower power leads, flue pipe,
and pressure switch tubing.
3. Remove the round cutout from the appropriate side of the
furnace.
4. Remove and save the four screws that hold the induced
draft blower to the flue collector box.
5. Turn the induced draft blower 90 degrees clockwise, or
counterclockwise. The gasket is adhered to the back plate
and will rotate with the blower assembly.
6. Reinstall the induced draft blower on the flue collector box,
using the four screws removed in Step 3. Tighten screws
to provide an airtight seal.
7. Reconnect the induced draft blower power leads. NOTE:
If the wires are not long enough, pull extra wire from the
wire bundle in the blower compartment.
8. Remove and save the screw that holds the pressure switch
to the furnace top panel.
9. Relocate the pressure switch to the same side as the flue
outlet in the hole provided.
10. Reconnect the draft blower power leads, flue pipe, and
pressure switch tubing. Make sure that all wires and the
pressure switch tubing are at least one inch from the flue
pipe, or any other hot surfaces.
11. Restore power to the furnace.
WARNING
N
EVER ALLOW THE PRODUCTS OF COMBUSTION, INCLUDING CARBON
MONOXIDE, TO ENTER THE RETURN DUCTWORK OR CIRCULATION AIR SUPPLY.
VII. EXTERIOR MASONRY CHIMNEYS -
CATEGORY I FURNACES ONLY
An exterior masonry chimney is defined as a “Masonry chimney
exposed to the outdoors on one or more sides below the roof
line.” The ability to use a clay lined masonry chimney depends
on a parameter not associated with interior chimneys. This variable
is the geographic location of the installation. Researchers have
discovered that the winter design temperatures have a direct
impact on the suitability of this type of venting. In most situations,
the existing masonry chimneys will require a properly sized metallic
liner.
WARNING
P
O SSIBIL IT Y O F PRO PER TY DA M A GE , P ERSO N AL INJ UR Y O R D EAT H
DA M A GIN G CO N DE NS AT ION CA N O CC UR IN SID E M ASO N RY C HIM N E YS W HEN A
SIN GL E F AN AS SIS TED
C
AT EG O R Y
I
AP PLIA NC E (80 %
A FU E
FU RNA CE ) IS
VENT ED WIT HO UT AD EQ U AT E D IL U TIO N AIR .
D
O N O T CO NN EC T A N 8 0%
FU RN AC E T O A MA SO NR Y C HIM NEY U NL ES S T H E F UR NA CE IS CO M M O N V EN TE D
W ITH A D RAFT HO OD EQ UIPPED A PPL IA NCE O R T HE CH IM N EY IS L IN E D W IT H A
M ETA L L INER O R
T
Y PE
B
M ET AL VE NT .
A
L L INS T AL LA T IO N S USING M A SO NRY
CH IM N EY S M US T B E S IZ ED IN A CC OR DA N CE W ITH TH E A PP RO PRIATE V ENT ING
TA BL ES.
I
F AN 80 % F UR N AC E IS C OM M O N V EN TE D W ITH A DRA FT HO OD
EQ UIP PED A PP L IA NC E, T HE PO TE N TIA L F O R C O ND EN SA T IO N D AM AG E M AY
ST ILL EXIST W ITH EXT RE M ELY CO L D CO ND ITIO NS, LO NG VE NT CO NN ECT O R S,
EXTER IO R C HIM NE YS , O R A NY CO M B INA T IO N O F T HE SE CO ND ITIO NS.
T
HE
RIS K OF CO ND ENS AT ION DAM A G E IS BE ST AVO ID ED BY US ING THE M AS ON RY
CH IM N EY A S A PA TH WA Y F O R PR O PERL Y S IZED M ET AL LIN ER O R
T
YPE
B
M ETA L VEN T .
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
Figure 8 - Typical Multiple Flue Clay Tile Chimney
C
HECKLIST
S
UMMARY
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 qualified 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 finalized, we believe this report represents
the best information on this subject which is currently available.
