4 18-AD37D1-1-EN
Installer’s Guide
Figure 7
CASED
COIL
UPFLOW
FURNACE
TOP COIL FLANGE
FITS INSIDE OF
FURNACE
TOP FLANGE FOR
HORIZONTAL RIGHT
APPLICATION
UPFLOW
Figure 6
Figure 8
Note: when installing coil onto an S-Series furnaces in
horizontal right or downflow configuration, bend the
flanges downward for a flush fit.
UPFLOW FURNACE IN
HORIZONTAL RIGHT AIRFLOW POSITION
Airflow
CASED COIL
G. FURNACE IN HORIZONTAL RIGHT POSITION
Both the coil and furnace must be fully supported. Do not
attempt to suspend the coil using the brackets.
Note: when installing onto an S-Series furnaces in horizontal
right or downflow configuration the flanges will be bent
downward.
1. HORIZONTAL RIGHT COIL
CONVERSION:
S-Series upflow furnaces can be horizontal left or
right. For legacy furnaces, the non-condensing
furnaces may be laid on either side for horizontal
application. The condensing downflow/horizontal
right and upflow/horizontal left furnaces may only be
rotated onto their left side.
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 but recommended: Remove the factory
installed two-piece baffle assembly from the top of the
coil by removing the 5/16” hex head screws. See Figure
2. Replace only the top baffle using the same screws
previously provided.
IMPORTANT:
The A4MX cased coil must be placed downstream of the
furnace. See Figure 7 for proper orientation.
2. When the non-condensing Upflow/Horizontal furnace
is placed on its right side for right airflow, the furnace top
flange meets the cased coil top flange. The coil flange fits
inside of the furnace flange. See Figure 6 and 8.
3. Use field-supplied self-drilling screws to connect the coil
to the furnace. Seal all gaps between the furnace and coil.
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