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INSTALLATION
These
units
can
be
installed
in
either
upflow
or
downflow
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.
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
¢ Do not overheat valve. Temperatures that exceed 212°F (100°C)
can harm valve performance. Use a wet cloth or heat sink when
brazing.
¢ Place filter dryer near ID unit to reduce the risk of debris
clogging the valve.
¢ Make sure TXV bulb is securely fastened and wrapped in the
indentation on heater tube.
CNPVU 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.
CNRVU
Models:
These coils have a factory- installed hard- shutoff TXV
designed
only for use with R-22 refrigerant. Use only with outdoor units
designed for R- 22.
NOTE:
All TXVs
have preset superheat settings and are not
field- adjustable.
°
Header Plate
1 pe.
Airflow
Airflow
amount
and
distribution
are vital to adequate
system
performance.
Problems
that can be experienced
with
incorrect
airflow include:
¢ low system performance
¢ restricted TXV
¢ frosted coil
* poor humidity control
¢ 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.)
Condensate Management
With proper installation, these coils will manage
the condensate
without blow-off into the duct work.
See detailed instructions for
more info.
Procedure 1 — Inspect Equipment
File claim with shipper if equipment is damaged.
The
following
parts
are included
with
this coil (See
Fig.
1),
depending
on
your
application
different
components
will
be
required.
COMPONENT
QUANTITY
2
Extension Air Baffles
2 pcs. (Attached to coil)
Support Rails
2 pcs.
Collar
1 pe.
A06362
Fig. 1 - Uncased N- Coil Components
2
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