Filters Mounted External To Furnace - Thermo Products Spirit VHF-ABE Installation, Operation And Service Manual

All installations and services must be performed by qualified service personnel.
The duct system should again follow the current design standard of Air Conditioning Contractors of America
(ACCA) or ASHRAE Fundamentals volume.The most common location for the A-shaped coil (A style) is shown in
Fig. 1.
Fig 1: Acceptable locations for the air conditioner evaporator coil.
NOTICE: The minimum coil pan clearance for a drum type heat exchanger is three inches unless specified
otherwise by the individual coil manufacturer.
D. FILTERS MOUNTED EXTERNAL TO FURNACE
On highboy furnaces, it is necessary to cut the return air opening in the side or rear casing, depending upon the
needs of the specific installation.
The filter rack provided with the furnace, refer to Fig. 2, will serve as a template to scribe a mark for the return air
opening on the casing. Place the filter rack on a side casing approximately one inch up from the bottom of the
furnace and centered from side to side. Place the securing flange against the casing when locating the return air
opening. For your convenience, (4) locator knock-outs have been placed at the proper locations on both the left and
right side casings.
PLEASE NOTE: While scribing the return air opening, the filter rack can be held in position by tape or similar
temporary means.
Fig. 2: A typical filter rack and dimensions for the VHF-A** furnace.
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