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3. Coils that under- -hang (narrower than furnace) must have a
2 1/4" (57 mm) long (minimum) field- -fabricated transition
between furnace and N- -coil casing.
4. Coils that overhang (wider than furnace) do not require a
transition in downflow application. However, a field- -sup-
plied furnace shelf should be constructed to fit furnace to
coil opening.
5. Place furnace on top of N- -coil casing, or field- -supplied fur-
nace shelf.
NOTE: When removing a coil from its casing in the downflow
position, support the front of the furnace with field supplied
bracing. See Fig. 6.
Fig. 6 - - Field Supplied Bracing
Upflow Uncased Coil Installation
Only the coils marked with an asterisk (*) on Table 1 can be used
as an uncased application. In these models the coil can be removed
from the casing and installed as an uncased coil without need to
field- -fabricate a coil enclosure to prevent air bypass.
1. Field fabricate coil support shelf using dimensions given in
Fig. 3. The coil support shelf is required to complete the un-
cased installation.
2. Locate and install the coil support shelf above furnace duct
flanges, the coil support shelf is designed to accommodate
upflow furnace opening flanges.
3. Set coil in place.
4. Place plenum enclosure on furnace.
5. Insulate plenum enclosure.
6. Affix caution label to the right side of plenum enclosure.
See Fig. 7. The caution label is included with the Installa-
tion Instructions.
Fig. 7 - - Plenum Caution Label
Furnace
A05413
A08349
7. Continue with normal installation practices. See Connect
Refrigerant Piping.
Connect Refrigerant Piping
Use accessory tubing package or field- -supplied tubing of
refrigerant grade. Suction tube must be insulated. Do not use
damaged, dirty, or contaminated tubing because it may plug
refrigerant flow- -control device. ALWAYS evacuate the coil and
field- -supplied tubing before opening outdoor unit service valves.
Connect Refrigerant Liquid and Suction Lines
For matched and mismatched systems, use line sizes recommended
in outdoor unit Installation Instructions.
The coil can be connected to outdoor units using accessory tubing
packages or field- -supplied tubing of refrigerant grade. Always
evacuate tubing and reclaim refrigerant when making connections
or flaring tubing. Leak check connections before insulating entire
suction line.
SUCTION LINE
Suction line is designed for field sweat connection. Line is plugged
to keep out moisture and dirt. Remove these plugs only when
ready to make connection.
See Table 1 for coil connection tube size.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
To avoid valve damage to the refrigerant control device while
brazing, valves must be wrapped with a heat- -sinking material
such as a wet cloth.
1. Remove cabinet access door.
2. Remove rubber plugs from coil stubs using a pulling and
twisting motion. Hold coil stubs steady to avoid bending or
distorting.
3. Wrap TXV and nearby tubing with a heat sinking material
such as a wet cloth.
4. Use 1/2 psig Nitrogen purge in the suction and out the li-
quid line.
5. Braze using a Sil- -Fos or Phos- -copper alloy. Do not use soft
solder.
6. After brazing, allow joints to cool. Slide rubber grommets
over joints. Position tubing at center of each grommet to en-
sure an air seal around the tube.
7. Always evacuate lines and reclaim refrigerant when making
connections or flaring refrigerant lines. Leak check connec-
tions before insulating entire suction line.
8. If outdoor equipment will not be installed until a later date,
braze liquid and suction lines closed outside. Add a
Schraeder port test fitting to the suction line outside.
REFRIGERANT METERING DEVICE
CNPVP Models:
These coils have a factory- -installed hard shut- -off TXV designed
only for use with R- -410A refrigerant. Use only with outdoor units
designed for R- -410A.
CNRVP Models:
These coils have a factory- -installed hard shut- -off TXV designed
only for use with R- -22 refrigerant. Use only with outdoor units
designed for R- -22.
NOTE: ALL TXV'S HAVE PRESET SUPERHEAT SETTINGS
AND ARE NOT FIELD- -ADJUSTABLE.
Condensate Drain Line Connection
The coil is designed to dispose of accumulated water through
built- -in condensate drain fittings. It is recommended that PVC
5
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