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INTRODUCTION
The ENH4X is a horizontal, multi--use furnace coil (see
Figure 1). With the use of field--supplied transition duct,
these furnace coils can also be applied to other similar
horizontal furnaces on the market. The ENH4X is available
in sizes 24 through 60. All models are equipped with a
factory--installed TXV and are used with R--410A refrigerant
systems.
NOTE
: Models with tin--plated copper coils, “T” in the 8th
position of the model number, are installed the same as
standard copper coils.
Shipping Brace
Remove
2 Screws
Pan Extension
A06031
Figure 1 -- Model ENH4X Furnace Coil
INSTALLATION
This coil is not designed to be installed with furnaces that
measure wider than the coil itself.
These units can be installed in multiple configurations.
Before
installation,
there
are
several
performance
requirements that must be considered because poor
installation can negatively alter performance. This section
will briefly discuss those factors.
Coil
Furnace
Ductwork
Airflow
Coil
Ductwork
Furnace
Filler Plate
Filler Plate
Airflow
Furnace
Coil
Ductwork
Airflow
Filler Plate
A08065
Figure 2 -- Horizontal--Left Installation with Filler Plate
Coil
Ductwork
Airflow
Furnace
Furnace
Coil
Ductwork
Airflow
Filler Plate
Coil
Ductwork
Airflow
Furnace
Filler Plate
Filler Plate
A08066
Figure 3 -- Horizontal--Right Installation with Filler Plate
Airflow
Airflow amount and distribution are vital to adequate system
performance. In addition, heat pump applications require
airflow in a particular direction for best performance. See
decal on front of coil for correct direction. Problems that can
be experienced with incorrect airflow include:
S
low system performance
S
restricted TXV
S
frosted coil
S
poor humidity control
S
water blow--off
When attaching the coil and building the plenum, pay
special attention to the effect these details will have on
airflow. After system start--up, check the cfm to insure that it
is correct. (Generally, the cfm should be 350 to 400 cfm/ton
during normal cooling operation.)
TXV
A thermal expansion valve is utilized in this coil design to
optimize performance and comfort throughout the entire
operating range of the system. Special attention needs to be
taken to the TXV when installing the coil
S
Do not overheat valve. Temperatures that exceed 212
_
F
(100
_
C) can harm valve performance. Use a wet cloth or
heat sink when brazing.