4
18-AD28D1-2
Installer’s Guide
F. FURNACE IN HORIZONTAL LEFT POSITION
▲
CAUTION
!
Both the coil and furnace must be fully supported. Do not
attempt to suspend the coil using the brackets.
1. HORIZONTAL LEFT COIL CONVERSION (4NXCD063
Coil Only).
a. For the horizontal left configurations, the (2) outer
water diverter baffles must be removed for maximum
efficiency.
b. Remove the coil by sliding the coil out of the coil
enclosure.
c. Remove the (2) outer water diverter baffles by remov-
ing the 5/16” hex head screws. See Figure 8.
Figure 8
Figure 9
2. HORIZONTAL LEFT (4NXCB025 and 4NXCB031 only)
For horizontal left applications in the 4NXCB025 and the
4NXCB031 coils, the installer must remove the horizontal
drain pan retainer clips prior to installing the splash guard.
a. Remove the two screws holding the two horizontal
drain pan clips. See Figure 9.
b. Discard screws and clips.
2. DOWNFLOW GAS FURNACE
When a coil is used with a downflow furnace, a subbase
is not required between the coil case and combustible
flooring.
a. Place the coil case on the furnace supply air ple-
num.
b. Secure the coil case to the plenum.
c. Set the furnace on top of the coil case, making sure
that the back side of the discharge opening is snug up
against the duct flange at the top rear of the coil case.
d. Secure the coil case to the furnace.
3. DOWNFLOW GAS FURNACE -- Add On Cooling
a. Turn the furnace power OFF, remove the flue pipe,
and disconnect the fuel and power lines.
b. Raise the furnace to provide sufficient clearance to
mount the coil case beneath it. Modifications will be
required to the existing return air ductwork to permit
the furnace to be raised.
c. Place the coil case on the furnace supply air plenum.
d. Secure the coil case to the plenum.
e. Set the furnace on top of the coil case, making sure
that the back side of the discharge opening is snug up
against the duct flange at the top rear of the coil case.
f. Reconnect the flue pipe and the fuel and power lines.
g. Turn the furnace power ON.
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.
