2
18-AD43D1-1A-EN
Installer’s Guide
CAUTION
!
This coil is pressurized with 8-12 psig of dry air. Do
not stand directly in front of the coil connections when
removing sealing plugs. If no pressure is released, check
for leaks.
C. RECOMMENDATION
If a coil is part of the total system installation, use the Installer’s
Guide packaged with the furnaces, outdoor sections, and ther-
mostat for physically installing those components.
UPFLO
W
FURNA
CE
CASED
COIL
SCREWS
(BOTH SIDES)
SELF TAPPING SCREWS (4)
1-1/2” MAXIMUM
FIELD SUPPLIED
FOR UPFLOW /
HORIZONTAL LEFT
INSTALLATIONS
E. FURNACE IN DOWNFLOW POSITION
1. 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 plenum.
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 and seal for air
leaks as required.
CAUTION
!
This coil is pressurized with 8-12 psig of dry air. Do
not stand directly in front of the coil connections when
removing sealing plugs. If no pressure is released, check
for leaks.
D. FURNACE IN UPFLOW POSITION
APPLICATION USES UPFLOW COIL MODEL ONLY
IMPORTANT:
If installing the coil in the horizontal position, you MUST
use the horizontal kit listed below for this coil model num
-
ber and follow the instructions in the installation guide
provided with the conversion kit.
Model Number
Horizontal Kit No.
4PXCBU36BS3HAC
BAYCONV23B
Figure 2
Figure 3
Attach Downflow
Bottom Gasket
Start
here
a. Lay the coil on its back side.
b. Locate the 4" wide gasket material found in
BAYGSKT001A0.
c. Attach the 4" gasket material to three sides of the
bottom of the drain pan as shown. Make sure to
start by matching up the edge of the gasket mate-
rial to the inner edge of the drain pan by the coil fins
and working outwards.
d. The gasket material can be cut or ripped easily so that
it can be tailored to fit. The gasket material must cover
the three sides along the entire length of the coil as
shown in Figure 3.
NOTE:
4PXC upflow coil may be installed in Upflow, Downflow,
Horizontal Right with kit, and Horizontal Left with kit.
1. UPFLOW GAS FURNACE
a. Apply gasket material (duct seal field supplied) to ALL
mating surfaces between the furnace and the coil case.
b. Set the coil case on top of the furnace. Connect the
ductwork to the coil case using field supplied screws.
See Figure 2.
c. Secure the coil case to the furnace and seal for air
leaks as required.
2. DOWNFLOW GASKET INSTALLATION (OPTIONAL):
For unusually humid applications that expect prolonged
operation above 70% RH, it is recommended to use the
BAYGSKT001A0 gasket kit to prevent water from forming
on the bottom of the drain pan and dripping into the supply
ductwork.
