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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.
4"
Downflow installation with coil rotated 90°
Horizontal Coil Installation
The unit can be installed on a work platform,
secured to roof truss in attic, suspended from
hangers on floor joists in crawl space, or
installed on blocks. It is designed to allow
airflow in either direction, to mate with
horizontal-left or horizontal-right furnace
installations. Ensure coil cabinet is level side
to side and front to back. It is allowable to
add up to 1/2-in. additional slope over length
and depth of coil cabinet in the direction of
drain pan connection.
Page 8
Horizontal Right Installation
1. Use field fabricated attachment plates to
secure coil to furnace.
2. Use self-tapping screws to mount
attachment plates to coil casing.
3. Connect furnace snugly against coil casing.
4. Use self-tapping screws to attach furnace.
5. Seal joint between coil casing and furnace
to create an airtight seal using locally
approved materials.
6. Use cork tape to create air seal between the
undersides of the pan extension and front of
the vertical drain pan.
7. Install included condensate pan extension
and two corner screws.
8. If coil is wider than furnace, use 4-in
minimum transition and self-tapping screws
to attach furnace.
Horizontal Left Installation
1. Unbend the 4 tabs at the right side of the
casing.
2. Connect furnace snugly against coil casing.
3. Use self-tapping screws to attach furnace.
4. Seal joint between coil casing and
furnace to create airtight seal using
locally approved materials.
5. If coil is wider than furnace, use 4-in.
Minimum transition and self-tapping
screws to attach furnace.
See next page for installation example
schematics
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