2
18-AD41D1-1B-EN
Installer’s Guide
CAUTION
!
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. UPFLOW COIL CONVERSION (Models:
4PXCBU36BS3HAB, 4PXCCU36BS3HAB,
4PXCBU42BS3HAB, 4PXCCU42BS3HAB,
4PXCBU48BS3HAB, 4PXCCU48BS3HAB,
4PXCDU48BS3HAB, 4PXCCU60BS3HAB,
4PXCDU60BS3HAB only)
a. For maximum efficiency, remove the factory installed
two-piece baffle assembly 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.
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
!
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 MODELS 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.
4PXCAU24BS3HAB
4PXCAU32BS3HAB
4PXCBU24BS3HAB
4PXCBU30BS3HAB
4PXCCU30BS3HAB
4PXCBD30BS3HDB
BAYCONV18B
4PXCBU36BS3HAB
4PXCCU36BS3HAB
4PXCBD36BS3HDB
4PXCCD36BS3HDB
BAYCONV23B
4PXCBU42BS3HAB
4PXCCU42BS3HAB
4PXCBU48BS3HAB
4PXCCU48BS3HAB
4PXCDU48BS3HAB
4PXCBD42BS3HDB
4PXCCD42BS3HDB
BAYCONV27B
4PXCCU60BS3HAB
4PXCDU60BS3HAB
4PXCCD60BS3HDB
4PXCDD60BS3HDB
BAYCONV30B
Figure 3
Figure 2
Remove
and
Discard
Replace
NOTE:
4PXC upflow coils may be installed in Upflow, Downflow,
Horizontal Right with kit, and Horizontal Left with kit.
4PXC downflow coils may be installed in Downflow and
Horizontal Right with kit.
2. 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 3.
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.
