Exterior Masonry Chimneys; Ategoryi Furnaces Only ); L Ocation - Goodman MH8 Installation Instructions Manual

E
XTERIOR MASONRY
NOTE: In a horizontal installation the air conditioning coil
must be adequately supported by proper brackets and
supports. Inadequate coil support can result in furnace cabinet
distortion and air leakage.
Counterflow units are shipped with the induced draft blower
discharging from the top of the furnace. ("Top" as viewed for a
counterflow installation.)
Vent the furnace in accordance with the National Fuel Gas
Code NFPA54/ANSI Z223.1-latest edition. In Canada, vent the
furnace in accordance with the national standard of Canada,
CAN/CSA B149.1 and CAN/CSA B149.2- latest editions and
amendments.
N
EVER ALLOW THE PRODUCTS
,
MONOXIDE TO ENTER THE RETURN
.
SUPPLY
E M C
XTERIOR ASONRY HIMNEYS
An exterior masonry chimney is defined as a "Masonry" chim-
ney 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. Re-
searchers 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.
P
OSSIBILITY OF PROPERTY DAMAGE
DAMAGING CONDENSATION
‐
WHEN A SINGLE FAN ASSISTED
)
FURNACE IS VENTED WITHOUT
80%
CONNECT AN FURNACE
FURNACE IS COMMON VENTED
APPLIANCE OR THE CHIMNEY
. A
METAL VENT LL INSTALLATIONS
SIZED IN ACCORDANCE WITH
80%
FURNACE IS COMMON
,
APPLIANCE THE POTENTIAL FOR
EXIST WITH EXTREMELY COLD
,
EXTERIOR CHIMNEYS OR ANY
T
HE RISK OF CONDENSATION
MASONRY CHIMNEY AS A PATHWAY
T B .
OR YPE METAL VENT
C
HIMNEYS
WARNING
,
OF COMBUSTION INCLUDING
DUCTWORK OR CIRCULATION
(C I F
A TEGORY URNACES
WARNING
,
PERSONAL INJURY OR DEATH
CAN OCCUR INSIDE MASONRY CHIMNEYS
C I (80% AFUE
ATEGORY APPLIANCE
. D
ADEQUATE DILUTION AIR
TO A MASONRY CHIMNEY UNLESS
WITH A DRAFT HOOD EQUIPPED
IS LINED WITH A METAL LINER
USING MASONRY CHIMNEYS
THE APPROPRIATE VENTING TABLES
VENTED WITH A DRAFT HOOD EQUIPPED
CONDENSATION DAMAGE MAY
,
CONDITIONS LONG VENT CONNECTORS
COMBINATION OF THESE CONDITIONS
DAMAGE IS BEST AVOIDED BY
FOR PROPERLY SIZED METAL
- C I F
ATEGORY
CARBON
Clean Out
AIR
O )
C
NL Y
HECKLIST
This checklist serves as a summary of the items to be checked
before venting an 80+ furnace into a masonry chimney. In addi-
tion, we recommend that a qualified serviceman use this check-
list to perform a yearly inspection of the furnace venting sys-
tem.
This checklist is only a summary. For detailed information on
each of the procedures mentioned, see the paragraph refer-
enced 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 repre-
sents the best information on this subject which is currently
available.
O NOT
THE
T B
OR YPE
MUST BE
. I
F AN
STILL
,
.
USING
LINER
14
O
URNACES NLY
Wash
Clay Tile Size: 8" x 8" x12"
(Each x 24" Length)
1/2" to 1" Air Space
Throat
Damper
Breech F.A.F. Vent
Connector
Fan Assisted
Forced Air
Furnace
Typical Multiple Flue Clay Tile Chimney
S
UMMARY
Roof Line
Attic Floor
Second Floor
First Floor
Water Heater
Vent Connector
Natural Draft
Water Heater
Basement Floor