IO137 10
WHERE THE MAXIMUM REQUIRED AIR FLOW IS 1800 CFM OR GREATER THE BOTTOM OR
BOTH SIDES MUST BE UTILIZED FOR RETURN AIR SUPPLY. NEVER USE THE REAR OF
THE FURNACE FOR THE RETURN AIR CONNECTION.
WARNING
A SOLID METAL BASEPLATE IS SUPPLIED ON THIS FURNACE. THIS BASEPLATE MUST BE
IN PLACE WHEN THE FURNACE IS INSTALLED WITH SIDE(S) RETURN AIR DUCTS. FAILURE
TO DO SO MAY PERMIT COMBUSTION PRODUCTS, INCLUDING CARBON MONOXIDE, TO
ENTER THE LIVING SPACE. THIS MAY CREATE POTENTIALLY HAZARDOUS CONDITIONS
SUCH AS CARBON MONOXIDE POISONING OR DEATH.
THE FULL SIZE RETURN AIR DUCT OPENINGS MUST BE UTILIZED. EMBOSSES ARE
PROVIDED FOR THIS PURPOSE.
ELECTRICAL SUPPLY CONNECTIONS
The electrical requirements are listed on the series and rating plate on the furnace. A separate
supply line with a current overload device and a manual switch, where required, must be installed.
Type “T” wire or equivalent with a minimum rating of 95
o
F (35
o
C) temperature rise must be run di-
rectly from the main power supply to the junction box in the furnace. Use wire which employs cop-
per conductors only.
Installation of the electrical supply should be according to local codes. In the absence of local
codes refer to the National Electrical Code ANSI/NFPA No. 70 (latest edition), which can be ob-
tained from the National Fire Protection Association, Batterymarch Park, Quincy, MA 02269. In
Canada refer to the latest edition of the Canadian Electrical Code C22.1 Part I.
WARNING
THE GAS SUPPLY PIPE MUST NEVER USED FOR GROUNDING PURPOSES.
CONTROL VOLTAGE CONNECTIONS
THERMOSTAT INSTALLATION
Install the thermostat according to the instructions accompanying the thermostat. Run the thermo-
stat wires into the control compartment in the furnace. Connect the thermostat wiring as shown on
the wiring diagram. The thermostat wiring should be a minimum of 18 gauge. Adhere to recom-
mended color code to facilitate future troubleshooting.
The thermostat should be located near the return air grille or opening. It should be approximately 5
feet from the floor level.
Never locate the thermostat where it will be influenced by heat generated from hot water pipes,
lamps, televisions, direct sunlight, supply air registers, etc.
Interconnecting wiring must be secured and protected from damage or disconnection. The use of
solderless connectors or equivalent is recommended.
The low voltage control wiring exiting the furnace is labeled “thermostat wiring."
SETTING THE HEAT ANTICIPATOR
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