Installer’s Guide
REMOVE FILTER FROM UPFLOW |
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FURNACE WHEN RETURN DUCT IS |
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ATTACHED TO FURNACE TOP SIDE |
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(HORIZONTAL LEFT OR RIGHT |
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APPLICATIONS) AS SHOWN. | FILTER | ||||||||||||||||||||||||
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Close coupled (less than 36") 
return (filter directly beneath bottom 
side return) not recommended due to
w *
LOCATING
NOTCHES *
PROVIDED
FOR SIDE
RETURN
CUTOUT
*
*
*SEE OUTLINE DRAWING
CUT OUT
FOR
SIDE
FILTER
FRONT
of Furnace
noise considerations. If used, securely attach 1/2" mesh metal hardware cloth protective screen to the inside bottom of filter grill.
7.Connect the duct work to the furnace. See Outline Drawing (pages 4&5) for supply and return duct size and location. Flexible duct connectors are recom- mended to connect both supply and return air ducts to the furnace.
If only the front of the furnace is accessible, it is recommended that both supply and return air plenums are removable.
8.When replacing a furnace, old duct work should be cleaned out. Thin cloths should be placed over the registers and the furnace fan should be run for 10 minutes. Don’t forget to remove the cloths before you start the furnace.
RETURN AIR FILTERS
(Filter and filter rack are not supplied with unit)
TYPICAL UPFLOW RETURN AIR FILTER INSTALLA- TIONS
These furnaces require high velocity type air filters. The optional filters may be located within the furnace blower compartment for UPFLOW furnaces in either a BOTTOM or SIDE (left side or right side) return air inlet. Some optional filters may need to be trimmed for side or bottom filter use.
NOTE:
On upflow 5 or 6 ton airflow models where the airflow requirement exceeds 1800 CFM - Models will require return air openings and filters on: (1) both sides; or (2) one side and the bottom; or (3) just the bottom.
The furnace and the blower filter rack installation can be seen in Figure 13.
The optional furnace filter in the bottom or side con- figuration can be removed by simply turning the two latches on the blower door and tilting the door forward.
The filter rails are spring loaded for automatic adjust- ment to allow standard size, locally obtainable replace- ment filters. The filter rack itself slides to adjust to the required width needed for bottom or side return.
MINIMUM CLEARANCE FROM COMBUSTIBLE MATERIALS FOR
UPFLOW/HORIZONTAL AND DOWNFLOW/ HORIZONTAL FURNACES
| UNIT LOCATION |
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FURNACE SURFACE | VERTICAL | HORIZONTAL | HORIZONTAL | |
CLOSET | CLOSET | ALCOVE / ATTIC | ||
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SIDES | 0" | 1" | 0" | |
BACK | 0" | 3" | 6" | |
TOP | 1" | 1" | 1" | |
FRONT | 3" | 3" | 18" | |
VENT | 0" | 0" | 0" |
NOTE: CLEARANCE REQUIRED AT TOP OF PLENUM IS 1"
11 |
