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WARNING
UPFLOW FURNACE: THE SOLID METAL BASE PLATE
(SHIPPED WITH THE FURNACE) MUST BE INSTALLED
IN THE FURNACE BOTTOM WHEN USING SIDE AIR RE-
TURN. FAILURE TO INSTALL A BASE PLATE COULD
CAUSE THE PRODUCTS OF COMBUSTION TO CIRCU-
LATE INTO THE LIVING SPACE AND CREATE
POTENTIAL LY HAZARDOUS CONDITIONS, INCLUDING
CARBON MONOXIDE POISONING OR DEATH. FOR
BOTTOM RETURN, A SOLID METAL BASE PAN MUST
NOT BE INSTALLED.
NOTE: DO NOT take return air from furnace rooms,
garages or cold areas. Avoid return air from utility rooms,
kitchens, laundry rooms and bathrooms.
DOWNFLOW INSTALLATIONS
1. Position the unit to minimize long runs of duct or runs
of duct with many turns and elbows.
2. If summer air conditioning is desired, position the in-
door coil on the supply-air side of the unit. Ensure that
no air can bypass this coil.
3. If installing on a combustible floor and not using an
air conditioning plenum, install the special non-com-
bustible floor base. See Table 1 and Figure 11.
4. Connect the furnace to the supply air plenum.
FIGURE 8
1
REMOVE BLOWER
DOOR AS SHOWN
2
FLANGE AND PUSH
PANEL INTO PLACE
RETAINING TAB
DETAIL
INSTALLATION OF SOLID METAL BASE FOR SIDE
3
INSERT TAB ONTO
INSTALL SCREW IN TAB LOCATED
IN THE BLOWER COMPARTMENT
TAPE ALL EDGES OF BOTTOM
RETURN APPLICATIONS
WARNING
A DOWNFLOW INSTALLATION IS CERTIFIED FOR IN-
STALLATION ON A NON-COMBUSTIBLE FLOOR. USE
THE SPECIAL BASE SPECIFIED ON THE FURNACE
CLEARANCE LABEL. FAILURE TO INSTALL THE SPE-
CIAL BASE MAY RESULT IN FIRE, PROPERTY DAM-
AGE, PERSONAL INJURY OR DEATH. THIS BASE IS
AVAILABLE AS AN ACCESSORY.
5. Connect the return air ducting to the return air opening
at the top of the unit. Make the connection air tight to
prevent the migration of toxic fumes and odors includ-
ing carbon monoxide from migrating into the living
space from an adjacent fuel-burning appliance.
NOTE: In downflow configuration, side return air cut
out is not permitted.
6. If a filter is installed near the furnace, be sure to
have adequate space for installation and removal
of the unit filter.
NOTE: DO NOT take return air from furnace rooms,
garages or cold areas. Avoid return air from utility
rooms, kitchens, laundry rooms and bathrooms.
HORIZONTAL INSTALLATIONS
1. Position the unit to minimize long runs of duct or runs
of duct with many turns and elbows.
INTERNAL VIEW
OF BLOWER
COMPARTMENT
TO COVER GAPS
4
AFTER
INSTALLATION
OF BOTTOM
PLATE, SEAL ALL
SEAMS TIGHT
WITH METAL
TAPE
DUCTING
ST-A1194-49
43
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