5052617-UIM-E-1116
Johnson Controls Unitary Products
7
Dimension “C” should be at least 2/3 of dimension “D”. See Figure 6.
CRITICAL COIL PROJECTION
The coil assembly must be located in the duct such that a minimum dis-
tance is maintained between the top of the coil and the top of the duct.
Refer to Table 2.
COIL / FURNACE ASSEMBLY - HD SERIES COILS
Horizontal duct coils are referred to as HD series coils. This coil must
be connected using a supply duct transition. This coil is direction sensi-
tive. Refer to the HD coil installation instructions for more information.
RESIDENTIAL AND MODULAR HOME UPFLOW
RETURN PLENUM CONNECTION
Return air may enter the furnace through the side(s) or bottom depend-
ing on the type of application. Return air may not be connected into the
rear panel of the unit.
SIDE RETURN APPLICATION
Side return applications pull return air through an opening cut in the
side of the furnace casing. This furnace is supplied with a bottom block-
off panel that should be left in place if a side return is to be used. If the
furnace is to be installed on a flat, solid surface, this bottom panel will
provide an adequate seal to prevent air leakage through the unused
bottom opening. However, if the furnace is to be installed on a surface
that is uneven, or if it is to be installed on blocks or otherwise raised off
the floor,
it will be necessary to seal the edges of the bottom panel
to the casing using tape or other appropriate gasket material to
prevent air leakage.
BOTTOM RETURN AND ATTIC INSTALLATIONS
Bottom return applications normally pull return air through a base plat-
form or return air plenum. Be sure the return platform structure or return
air plenum is suitable to support the weight of the furnace.
The internal bottom panel must be removed for this application.
Attic installations must meet all minimum clearances to combustibles
and have floor support with required service accessibility.
FIGURE 6:
PC Series Upflow Coil Installation
Table 2:
Coil Projection Dimensions - PC Series Coils
COIL SIZE
DIMENSION “C” INCH
PC18
3-1/2
PC24
4-1/2
PC30, PC32, PC35
4-1/2
PC42, PC43, PC36, PC37
5-1/2
PC48
6-1/2
PC60
9
NOTICE
Each coil is shipped with external tie plates that should be used to
secure the coil to the furnace. They should be installed on the back
and both sides of the coil using sheet metal screws. See Figure 7.
FIGURE 7:
Horizontal Left or Right Application (Right Shown)
F
lexible
Duct
C
onnector
Do not drill
or
S
crew
this flange
F
ield
F
abricated
Ductwork
Upflow
C
oil
Upflow
F
urnace
S
econdary Drain
Primary Drain
D
C
(
M
in)
A
lternate
Drain Location
A
0432-001
G
as
F
urnace
Use tie plates
supplied with coil
A
ir flow
A
0446-001
FIGURE 8:
Combustible Floor Base Accessory
FURNACE
WARM AIR PLENUM
WITH 1” FLANGES
FIBERGLASS
INSULATION
FIBERGLASS TAPE
UNDER FLANGE
COMBUSTIBLE FLOOR
BASE ACCESSORY
