Installation Manual

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Specifications subject to change without notice.
Installation of Furnace Coils
Upflow Cased Coil Installation
NOTE: On upflow installations where the indoor coil is placed in
an unconditioned space, a 6 inch (152 mm) wide piece of
insulation should be applied and wrapped around the outside of
coil casing and supply duct contact point.
1. Set coil in place on upflow furnace discharge air opening.
See Figure 2.
2. When coil front width matches furnace front width, the coil
can be placed directly on furnace.
3. Ensure coil is level for proper condensate drainage. Do not
tip coil toward condensate drain. Coil enclosure need not
be fastened or screwed to furnace.
Supply
Upflow
Furnace
Downflow
Furnace
Evaporator
Coil
Return
Return
Supply
A05411
Figure 2 − Typical Coil Installation
NOTE: When ENW4X coils are applied to same width furnace,
remove block−off plates at casing base by removing 2 screws
per plate from side of casing. See Figure 3.
Block-Off
Plates
A05412
Figure 3 − Block−Off Plate Removal
ENW4X MODEL COILS APPLIED CENTERED OVER
NARROW FURNACE
1. There is no transition required for this application.
2. Remove coil from packaging and place on top of furnace
with 1−5/8 inch (41 mm) overhang on both sides. See
Figure 4, Alternative A.
3. Continue with normal installation practices. See Connect
Refrigerant Piping.
STANDARD MODEL COILS APPLIED CENTERED OVER
NARROW FURNACE REQUIRE A MINIMUM TRANSITION AS
SPECIFIED IN Figure 5.
1. Prepare transition, following recommended transition
drawing. See Figure 5.
2. Place transition on top of gas furnace. See Figure 4,
Alternative B. Secure with sheet metal screws. Place coil
on top of transition. Make sure coil rests evenly on top of
transition and gas furnace.
3. Secure coil to transition using sheet metal screws.
4. Continue with normal installation practices. See Connect
Refrigerant Piping.
NOTE: If coil is not being installed in the standard orientation
(front of coil matching front of furnace) then coil must be raised
above furnace as specified in Figure 5.
STANDARD MODEL COILS APPLIED DIRECTLY ON TOP AND
OFFSET TO THE LEFT ON NARROW FURNACE
1. Notch support rail on underside of coil cabinet to provide
clearances for gas furnace flange. This rail is not visible
from front of coil. To locate position of notch, place coil
directly on top of gas furnace with overhanging portion
entirely on left side as in Figure 4, Alternative C. Mark
location of gas furnace flange on coil casing. Remove coil
from top of furnace. Using tin snips, make a notch in rail
large enough to allow clearance for gas flow furnace
flange.
2. Place coil on top of gas furnace. Make sure coil is shifted
completely to left side, and notch is sufficient so coil rests
on top of furnace cabinet.
3. Prepare and install block−off plate. See Figure 4,
Alternative C. Using field−supplied sheet metal, cut a
block−off plate to be attached to bottom left side of coil
casing. This plate prevents air leakage from overhanging
portion of coil. Attach plate using sheet metal screws.
4. Continue with normal installation practices. See Connect
Refrigerant Piping.
Downflow Cased Coil Installation
1. Place N−coil on supply duct opening.
2. When coil width matches furnace width, furnace can be
placed directly on the cased coil.
NOTE: In downflow installation with a 4−way multipoise furnace,
break off perforated duct flanges on furnace. See Furnace
Installation Instructions.
3. Coils that under−hang (narrower than furnace) must have a
field−fabricated transition between furnace and N−coil
casing as specified in Figure 5.
4. Coils that overhang (wider than furnace) do not require a
transition in downflow application. However, a
field−supplied furnace shelf should be constructed to fit
furnace to coil opening.