© Trane 2013
18-AD28D1-2
Installer’s Guide
Standoffs and screws (See Figure 4) 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 4). 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
above instructions apply if the coil is on top of an upflow
furnace.
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.
Figure 2
Standoff
Drill Screw
Figure 4
C. RECOMMENDATION
If a coil is part of the total system installation, use the Install-
er’s Guide packaged with the furnaces, and outdoor sections,
and thermostat for physically installing those components.
D. FURNACE IN UPFLOW POSITION
1. UPFLOW COIL CONVERSION (Model 4NXCD063
only)
a. Remove the factory installed two-piece baffle as-
sembly from the apex of the coil by removing the 5/16”
hex head screws. See Figure 2.
b. Replace only the top baffle using the same screws
previously removed.
c. The (2) outer water diverter baffles and the two
piece factory baffle must be removed and the top baffle
replaced for maximum efficiency.
d. Remove the coil by sliding the coil out of the coil
enclosure.
e. Remove the (2) outer water diverter baffles by
removing the 5/16” hex head screws. See Figure 3.
Alignment Holes
on both sides.
UPFLO
W
FURNA
CE
CASED
COIL
SCREWS
(BOTH SIDES)
STANDOFFS
(BOTH SIDES)
STANDOFFS (4)
DRILL SCREWS (4)
FOR VERTICAL
INSTALLATIONS:
Figure 3
Remove
and
Discard
Replace
2. UPFLOW GAS FURNACE
a. Turn furnace power OFF and remove the flue pipe if
necessary.
b. Apply gasket material (duct seal field supplied) to
ALL mating surfaces between the furnace and the coil
case.
c. Set the coil case on top of the furnace. Connect the
ductwork to the coil case.
d. Replace the furnace flue pipe if it has been removed
and fasten it securely.
e. Turn the furnace power ON.
3. UPFLOW GAS FURNACE - Add-on Cooling
a. Turn furnace power OFF and remove the flue pipe if
necessary.
b. Disconnect and remove a sufficient portion of the
supply ductwork to provide clearance for the cased coil.
c. Install the cased coil following the Installation In-
struction section D-1 of these instructions.
d. Reconnect the ductwork to the coil case.
e. Replace the furnace flue pipe if it has been removed
and fasten it securely.
f. Turn the furnace power ON.
