484 01 3905 04 3
Specifications subject to change without notice.
Return
Return
Supply
Supply
Evaporator
Coil
Horizontal Left Furnace Installation
Horizontal Right Furnace Installation
A05400
Evaporator
Coil
Return
Return
Supply
Supply
Downflow
Furnace
Installation
Upflow
Furnace
Installation
A05401
Figure 1 − Typical Coil Installation on Furnace
INSTALLATION OF EVAPORATOR COILS
Upflow coil installation
The cased coil is designed to fit furnaces of the same width.
1. Set coil in place on upflow furnace discharge air
opening.
2. Ensure coil is level for proper condensate drainage. Do
not tip coil toward condensate drain. Coil casing need
not be fastened or screwed to furnace.
3. When installing wider coil on narrow furnace, create field
fabricated adapter. (See Figure 2)
NOTE: On upflow installations where the indoor coil is placed in
an unconditioned space, a 6” wide piece of insulation should be
applied and wrapped around the outside of coil casing and
supply duct contact point.
NOTE: Consult the furnace installation instructions for any
special requirements when installing the coil to the furnace.
Horizontal Right & Left Installation
A170281
Vertical Upflow & Downflow Installation
A170280
Figure 2 − Adapter(s) Installation When Coil Overhangs
Furnace
Downflow Coil Installation
IMPORTANT: Installing “A” coils rotated 90 degrees from the
front of the furnace in downflow applications can cause water
blow off or coil freeze up. This is due to the concentration of air
on one coil slab or lack of air on the opposite coil slab. If the
airflow is high due to ductwork or other causes, and there is a
chance for water blow off, it is recommended that a 4−in.
minimum field−supplied adapter be placed between the coil
and the furnace to allow the air to distribute evenly to both coil
slabs. (See Figure 3)
4. Set cased coil on supply duct opening.
5. Place field fabricated 4−in. minimum adapter on coil
casing. Adapter should be tapered to fit coil/furnace
combination when one of them is larger than the other.
6. Set furnace on adapter.
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