2
INSTALLATION
Shipping Brace
Remove
2 Screws
Pan Extension
A06031
Fig. 1 -- Model CNPHP Furnace Coil
CNPHP furnace coils are NOT designed to be installed with
furnaces that measure wider than the coil itself.
These units can be installed in multiple configurations. To ensure
proper performance of the system, install and orientate the
components as shown in Fig. 4. Use Tables 1 and 2 to identify
which Application Letters (A through J) are acceptable for the
furnace width and coil width being used in a specific situation.
Orientate and configure the furnace and coil as shown in each
application.
Before installation, there are several other performance
requirements that must be considered because poor installation can
negatively alter performance. The following section will briefly
discuss those factors.
Airflow
Airflow amount and distribution are vital to adequate system
performance. 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
NOTE
: In addition, heat pump applications require airflow in a
particular direction for best performance. See decal on front of coil
for correct direction.
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
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Do not overheat valve. Temperatures that exceed 212
_
F (100
_
C)
can harm valve performance. Use a wet cloth or heat sink when
brazing.
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Place liquid filter dryer near ID unit to reduce the risk of debris
clogging the valve.
S
Make sure TXV bulb is securely fastened and wrapped in the
indentation on vapor line tube.
CNPHP Models:
These coils have a factory--installed hard--shutoff TXV designed
only for use with R--410A refrigerant. Use only with outdoor units
designed for R--410A.
NOTE
: All TXV’S have preset superheat settings and are not
field--adjustable.
Cabinet Sweating
If this unit is installed in a garage, attic, or other unconditioned
space, special attention needs to be given to the potential of cabinet
sweating. A 6--in (152 mm) wide piece of insulation should be
wrapped around the coil casing and supply duct connection point.
Condensate Management
With proper installation, these coils will manage the condensate
without blow--off into the duct work. The 60 size coil requires the
addition of a pan extension for both horizontal left and horizontal
right position, which is supplied with the coils. See detailed
instructions for more info. Also, refer to Connect Condensate
Drain Line section of this instruction.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
When installing over a finished ceiling and/or living area,
install a field--fabricated secondary condensate pan under the
entire unit.
CAUTION
!
HORIZONTAL--RIGHT AND HORIZONTAL--
LEFT WITH PAN EXTENSION (5 Ton Size
Only)
1. There are two separate pan extensions shipped with the unit.
For horizontal left installations, use the pan attached to the
left shipping bracket. For horizontal right installations, use
the pan attached to the right shipping bracket. Be sure to use
the correct pan extension for the application. There should
not be any gaps between the plastic condensate pan and the
pan extension. All condensate should flow from the pan
extension to the plastic condensate pan and not leak into the
coil cabinet or duct.
NOTE
: Discard the pan not used along with both shipping
brackets.
2. For horizontal--left installation, install pan extension onto
left end of horizontal--condensate pan. Pan extension is
slotted to fit onto condensate pan edge and will extend into
supply plenum. See Fig. 2.
Supply
Plenum
Condensate Pan
Pan Extension
A06032
Fig. 2 -- Horizontal--Left Installation of Pan Extension
3. For horizontal--right installation, install pan extension onto
right end of horizontal--condensate pan. Pan extension is
slotted to fit onto condensate pan edge and will extend into
supply plenum. See Fig. 3.
