Primary And Secondary Furnace Illustrations - United States Stove Company SP8500 Owner's Manual

PRIMARY FURNACE
This appliance requires the installation of a cold air return duct system. The return air will provide a better distribution
of warm air throughout your home, making the unit much more effi cient than if installed without a return system.
This appliance must be installed by This appliance must be installed by
experienced personnel and in accor- experienced personnel and in accor-
dance with the instructions of the man- dance with the instructions of the man-
ufacturer and in a manner acceptable ufacturer and in a manner acceptable
to the authority having jurisdiction. to the authority having jurisdiction.
When required by the authority having When required by the authority having
jurisdiction, such personnel must be jurisdiction, such personnel must be
licensed to perform this service. licensed to perform this service.
All installation confi gurations require
the use of a return air system unless
specifi ed otherwise herein.
SECONDARY (ADD-ON) FURNACE
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-
mary furnace from back fl owing to the secondary furnace. The damper must be a mechanical (spring return) style with
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
an electronic damper requiring a power supply. This power supply must come from a different source.
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-
nect to ductwork that is in good condition. Never direct the air fl ow from the exisiting furnace thru the Add-On furnace.
CAUTION: MAINTAIN COMBUSTION CAUTION: MAINTAIN COMBUSTION
AIR SUPPLY TO BOTH FURNACES, AIR SUPPLY TO BOTH FURNACES,
AIR STARVATION IS DANGEROUS. AIR STARVATION IS DANGEROUS.
OPERATE THE EXISTING FURNACE
PERIODICALLY TO ENSURE THAT IT
WILL OPERATE SATISFACTORILY,
WHEN NEEDED.
DO NOT RELOCATE OR BYPASS ANY
OF THE SAFETY CONTROLS IN THE
EXISTING FURNACE INSTALLATION.
REFER TO THE MANUFACTURER'S
INSTRUCTIONS OF YOUR EXISTING
FURNACE.
DO NOT USE DUCT ELBOWS HAV-
ING AN INSIDE RADIUS OF LESS
THAN 150mm (6 in.).
DO NOT CONNECT TO A DOWN
FLOW FURNACE.
DO NOT CONNECT DUCTWORK SO
THAT A REVERSE FLOW IS POSSIBLE.
USSC
Installation
11