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 |
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FOR SIDE |
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RETURN |
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CUTOUT | * |
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*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.
When the upflow furnace is installed in the horizon- tal right or left application and a return duct is at- tached to the top side as shown in Figure 11, re- move the filter from the furnace and install in a re- mote location.
Do not install the filter in the return duct directly above the furnace in horizontal applications.
When the upflow furnace is installed in the horizon- tal right or left application and a close coupled (less than 36") return duct is attached to the bottom side of the furnace as shown in Figure 11, securely at- tach a 1/2" mesh metal hardware cloth protective screen to the inside bottom of the filter grill to pre-
vent personal injury from contacting moving parts when reaching into the return opening to replace the filter.
Close coupled (less than 36") return (filter directly beneath bottom side return) is not recommended due to noise considerations.
Downflow Furnaces: Brackets are factory sup- plied to mount filters in the return air duct work.
8.Connect the duct work to the furnace. See Outline Drawing for supply and return duct size and loca- tion. Flexible duct connectors are recommended to connect both supply and return air ducts to the fur- nace.
If only the front of the furnace is accessible, it is recommended that both supply and return air ple- nums are removable.
9.The horizontal installation of the upflow fur- nace requires an external filter section. Do NOT use the bottom return filter within the fur- nace. Filter kits are available for horizontal applications.
10.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 be- fore you start the furnace.
e
Airf low
BOTTOM FILTER RACK INSTALLATION
11.The bottom panel of the upflow furnace must be removed for bottom return air. After removing the filter and filter rack, lay the furnace on its back. Remove the two 5/16" hex screws securing the front of the bottom channel to the cabinet. Rotate the channel downward (or remove by lowering the front edge of the channel and pulling forward). Slide the bottom return air panel out of the cabinet. Rotate the front channel to its original position and rein- stall the two 5/16” screws.
RETURN AIR FILTERS
TYPICAL UPFLOW RETURN AIR
FILTER INSTALLATIONS
These furnaces require high velocity type air filters. The filters may be installed within the furnace blower compartment for UPFLOW furnaces in either a BOT- TOM or SIDE (left side or right side) return air inlet. Some filters may need to be trimmed for side or bottom filter use.
NOTE:
For upflow 5 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 bottom filter rack installation can be seen in Figure 13.
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