2
18-AD42D1-1B-EN
Installer’s Guide
C. RECOMMENDATION
If a coil is part of the total system installation, use the Installer’s
Guide packaged with the furnaces, outdoor sections, and
thermostat for physically installing those components.
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
1. UPFLOW COIL CONVERSION
While not required, optional removal of some coil
components will maximize airflow efficiency.
a. Remove the coil by sliding the coil out of the coil
enclosure.
b. Optional for maximum efficiency: Remove the
horizontal
drain pan from the coil and discard.
c. If present, remove the (2) outer water diverter baffles.
See Figure 2.
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.
c. Secure the coil case to the furnace and seal for air
leaks as required.
E. FURNACE IN DOWNFLOW POSITION
CAUTION
!
To prevent damage to pan, ensure Heat Shield is assembled
to Horizontal Drain Pan. See Figure 8.
1. DOWNFLOW COIL CONVERSION
While not required, optional removal of some coil
components will maximize airflow efficiency.
a. Remove the coil by sliding the coil out of the coil
enclosure.
b. Optional for maximum efficiency: Remove the horizontal
drain pan from the coil and discard.
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.
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 in Figure 4. Make
sure to start by matching up the edge of the gasket
material 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 4.
FOR UPFLOW /
HORIZONTAL LEFT
INSTALLATIONS
Figure 3
UPFLO
W
FURNA
CE
CASED
COIL
SCREWS
(BOTH SIDES)
STANDOFFS
(BOTH SIDES)
STANDOFFS (4)
DRILL SCREWS (4)
Figure 4
Attach Downflow
Bottom Gasket
Start
here
3. 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.
Figure 2
WATER DIVERTER (X2)
