2
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
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.
S
Place 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 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.
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
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
Support Rails
2
Collar
1
Header Plate
1
Grommets
2
Extension Air Baffles
2
Uncased N-coil
Support Rails
2 pcs.
Collar
1 pc.
Header Plate
1 pc.
Extension Air Baffles
2 pcs. (Attached to coil)
A06362
Fig. 1
−
Uncased N
−
Coil Components
