18-AD28D1-2
5
Installer’s Guide
Figure 12
Co
mf
or
t
TM
co
il
CASED COIL SHOWN INSTALLED HORIZONTAL LEFT WITH A DOWNFLOW
FURNACE AND HORIZONTAL ALIGNMENT BRACKETS
BRACKETS SHIP WITH
DOWNFLOW FURNACES.
REQUIRED FOR ALIGNMENT
ON HORIZONTAL INSTALLATIONS.
AIRFLO
W
FURNA
CE
DUCT
SPLASH
GUARD
CASED COIL
Figure 11
Figure 10
CASED COIL CONNECTION
BRACKET FOR DOWNFLOW
FURNACE IN HORIZONTAL
CAUTION
!
Coil is pressurized with 10 to 20 psi nitrogen. Remove
the valve core on the pressure tap to release the pres-
sure before un-sweating the tubing caps. If no pressure
is released, check for leaks.
Standoffs and screws (See Figure 13) are included with
the cased coils for attachment to the furnace. There are
clearance alignment holes near the bottom of the coil wrap-
per. Drill screws are used to engage the top flanges of the
furnace. The standoff is inserted into the cabinet alignment
hole (See Figure 13). The drill screws are inserted through
the standoffs then screwed into the furnace top flange. The
coil is always placed downstream of the furnace airflow. The
coil and furnace must be fully supported when used in the
horizontal position. The standoffs and screws are strictly
for securing alignment, not for support in horizontal.
Standoff
Drill Screw
Figure 13
Alignment Holes
on both sides.
3. HORIZONTAL LEFT (All coils)
The non-condensing furnaces may be laid on either side
for horizontal application. The condensing downflow/hori-
zontal and upflow/horizontal furnaces may only be rotated
onto their left side. Connection brackets for coil/furnace
alignment are included with the furnaces.
a. In horizontal left, the
4NXC
coil case is rotated so
the apex of the coil is away from the furnace and the
auxiliary drain pan is now on the lower side.
b. The two piece baffle ships installed on the coil and is
required for horizontal left applications.
c. The base of the coil enclosure is placed flush against
the downflow/horizontal furnace. Upflow/horizontal
condensing furnaces have the coil match the top flange.
d. There are three brackets included with the downflow
furnace which are used to connect the furnace and coil
together. See Figure 10.
e. Two brackets are used to attach the rear of the coil
and furnace and one bracket is used to attach the front.
The rear brackets will use existing screws on the coil
enclosure (two on each side at the bottom). Each of the
rear brackets will be attached with the wide side of the
bracket resting on the top and bottom of the horizontal
coil and furnace (see Figure 11). Four additional screws
will be used to attach each rear bracket.
f. The front bracket is positioned as close to the cen-
ter as possible with the narrow edge against the coil
enclosure and the wide edge against the furnace . Two
screws each are driven into the coil enclosure and fur-
nace.
g. There is a splash guard packaged with the coil. This
guard is for horizontal left coil installation only. The
guard has a bend which is inserted into the front chan-
nel of the horizontal drain pan on the outlet air side
of the coil case. The guard is then rotated downward
until it rests in the drain pan. One sheet metal screw
is driven through the coil case duct flange on the front
side and into the splash guard side hole. See Figure 12.
