Exterior Masonry Chimneys; Ategoryi Furnaces Nly ) - Goodman MH8 Installation Instructions Manual

E
XTERIOR MASONRY
draft blower to properly orient the assembly. NOTE: If
the pipe section is less than 18", then attach it directly
to the chimney top on 3 sides and feed it through the
round cutout from the inside of the wrapper.
11. Reattach the induced draft blower using the (4) screws
retained from step 3. Ensure the gasket located between
the induced draft blower and collector box is rotated
accordingly.
12. 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.
13. Reconnect the remaining flue pipe, and the pressure
switch tubing. Ensure that all wires and the pressure
switch tubing is at least one inch from the flue pipe, or
any other hot surface.
14. Restore power to furnace.
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.
C
HIMNEYS
WARNING
,
OF COMBUSTION INCLUDING CARBON
DUCTWORK OR CIRCULATION
(C I F
A TEGORY URNACES
- C I F
ATEGORY
P
OSSIBILITY
DAMAGING CONDENSATION
WHEN A SINGLE
)
FURNACE IS
CONNECT AN
FURNACE IS COMMON
APPLIANCE OR
METAL VENT
SIZED IN ACCORDANCE
80%
FURNACE
,
APPLIANCE THE
EXIST WITH EXTREMELY
EXTERIOR CHIMNEYS
T
HE RISK OF
MASONRY CHIMNEY
T B
OR YPE METAL
AIR
Clean Out
O )
NL Y
C
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.
12
O
URNACES NLY
WARNING
,
OF PROPERTY DAMAGE PERSONAL
CAN OCCUR INSIDE
‐ C I
FAN ASSISTED ATEGORY
VENTED WITHOUT ADEQUATE DILUTION
80%
FURNACE TO A MASONRY
VENTED WITH A DRAFT
THE CHIMNEY IS LINED WITH
. A
LL INSTALLATIONS USING MASONRY
WITH THE APPROPRIATE
IS COMMON VENTED WITH A
POTENTIAL FOR CONDENSATION
,
COLD CONDITIONS
,
OR ANY COMBINATION
CONDENSATION DAMAGE IS BEST
AS A PATHWAY FOR PROPERLY
.
VENT
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
INJURY OR DEATH
MASONRY CHIMNEYS
(80% AFUE
APPLIANCE
. D
AIR O NOT
CHIMNEY UNLESS THE
HOOD EQUIPPED
T B
A METAL LINER OR YPE
CHIMNEYS MUST BE
. I
VENTING TABLES F AN
DRAFT HOOD EQUIPPED
DAMAGE MAY STILL
,
LONG VENT CONNECTORS
.
OF THESE CONDITIONS
AVOIDED BY USING
SIZED METAL LINER
Roof Line
Attic Floor
Second Floor
First Floor
Water Heater
Vent Connector
Natural Draft
Water Heater
Basement Floor