USSC
11
10
USSC
In
st
alla
tio
n
PRIMAR
Y
FURNACE
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When installed as a secondary furnace, it may only be connected to the ductwork of the existing primary furnace (Gas,
Electric, etc.). It should not be wired in conjunction with the existing furnace’
s circuitry
.
A
Duct Damper must be installed
between the air discharge of the 8500 furnace and the primary furnace.
This duct damper prevents the air of the pri-
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a simple closure switch to determine if the damper is opened or closed.
The damper will connect to the 8500’
s printed
circuit board (PCB) as a signal connection only
. See wiring diagram in this manual.
The PCB will not supply power to
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CAUTION: Do not connect your furnace’
s ductwork to the cold air return duct of your existing furnace because a pos-
sibility exists of components of the central furnace overheating and causing it to operate other than intended. Only con-
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In
st
alla
tio
n
THROUGH THE W
ALL
INST
ALLA
TION
(RECOMMENDED INST
ALLA
TION)
T
o
vent the unit through the wall, connect the pipe adapter to the exhaust motor adapter
. If the exhaust adapter is at least
24-inches above ground level, a straight section of pellet vent pipe can be used through the wall.
Y
our furnace dealer should be able to provide you with an installation kit, which will
include a wall thimble that will allow
the proper clearance through a combustible wall. Once outside the structure, a 3-inch clearance should be maintained
from the outside wall and a clean out tee should be placed on the pipe with a 90-degree turn away from the house.
At
this point, a 3-foot (minimum) vertical section of pipe should be added with a horizontal cap, which would complete the
installation.
A
support bracket should be placed just below the termination cap or one every 4-feet to make the system more stable.
If you live in an area that has heavy snowfall, it is recommended that the installation be taller than 3-feet to get above the
snowdrift line.
This same installation can be used if yo
ur furnace
is below ground level by simply adding the clean-out
section and vertical pipe inside until ground level is reached. With this installation you have to be aware of the snowdrift
line, dead grass, and leaves. W
e
recommend a 3-foot minimum vertical rise on the inside or outside of the house.
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deck, in an alcove, under a window
, or between two windows. W
e
recommend Simpson Dura-V
ent
®
or Metal-Fab
®
kits.
THROUGH THE ROOF/CEILING INST
ALLA
TION
When venting the furnace through the ceiling, the pipe is connected in the same manner as a wall installation, except
the clean-out tee is always on the inside of the house, and a 3-inch adapter is placed in front of the clean-out tee.
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manufacturer
’s
directions). It is important to note that if your vertical run of pipe is more than 15-feet, the pellet vent
pipe size should be increased to 4-inches in diameter
.
Do not exceed more than 4-feet of pipe on a horizontal run and use as few elbows as possible. If an of
fset is required,
it is better to install 45-degree elbows rather than 90-degree elbows.
1 V
ertical
Cap
2 Storm
Collar
3
Adjustable Roof Flashing
4
Cathedral Ceiling Support Box
5 Pipe
6 45°
Elbow
7 90°
Elbow
8 Horizontal
Cap
9 W
all
Thimble
10
Black Ceiling Support Firestop Spacer
1
1
Single
T
ee with Clean-Out
Adapter
12
T
ee Support Bracket
13
Double
T
ee with Clean-Out
Adapter
This appliance requires the installation of a cold air return duct system.
The return air will provide a better distribution
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CAUTION: MAINT
AIN COMBUSTION
AIR SUPPL
Y
T
O
BOTH FURNACES,
AIR ST
AR
V
A
TION IS DANGEROUS.
OPERA
TE
THE EXISTING FURNACE
PERIODICALL
Y
T
O
ENSURE THA
T
IT
WILL
OPERA
TE SA
TISF
ACT
ORIL
Y
,
WHEN NEEDED.
DO NOT
RELOCA
TE OR BYP
ASS
ANY
OF
THE SAFETY
CONTROLS IN
THE
EXISTING FURNACE INST
ALLA
TION.
REFER T
O
THE
MANUF
ACTURER’S
INSTRUCTIONS OF
YOUR EXISTING
FURNACE.
DO NOT
USE DUCT
ELBOWS HA
V
-
ING
AN INSIDE RADIUS OF LESS
THAN 150mm (6 in.).
DO NOT
CONNECT
T
O
A
DOWN
FLOW FURNACE.
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*
THA
T
A
REVERSE FLOW IS POSSIBLE.
This appliance must be installed by
experienced personnel and in accor-
dance with the instructions of the man-
ufacturer and in a manner acceptable
to the authority having jurisdiction.
When required by the authority having
jurisdiction, such personnel must be
licensed to perform this service.
the use of a return air system unless
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