Nordyne C8DA Series, Руководство по установке, Страница: 3 / 8

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GENERAL INFORMATION
C8DA series coils are designed for upflow or downflow
applications and are equipped with down turned refrigerant
connections and are ready for brazing.
• Check the coils orifice size and confirm that it’s suitable
for application with the intended outdoor unit. Depending
on application, additional installer supplied orifice or
TXV may be required.
• Optional cooling/heating equipment must be
properly sized and installed in accordance with the
furnace manufacturer’s specifications and approved
recommendations.
• Heating only furnace air circulators may have to be
replaced with multi-speed Heating/Cooling blowers to
upgrade the air delivery (CFM) when an add-on coil is
installed. Refer to Table 1 (page 6) for coil specifications,
recommended CFM, and allowances for pressure drop
across the coil and filters.
• Verify that the air delivery of the furnace/air handler is
adequate to handle the static pressure drop of the coil,
filter, and duct work.
• If precise forming of refrigerant lines is required, a copper
tubing bender is recommended. Avoid sharp bends and
contact of the refrigerant lines with metal surfaces.
• Refrigerant lines should be wrapped with pressure
sensitive neoprene or other suitable material where
they pass against sharply edged sheet metal.
• The coil enclosure (if provided) and suction line must
be insulated as needed to prevent condensate from
forming and causing property damage.
• Do not remove seals from the coil until the tubing
connections are ready to be made.
• Close-off plates are available in some air filter kits.
Refer to the Replacement Parts List for available part
numbers. Install the necessary close-off plates around
the refrigerant lines and drain line where required.
Reinstall all inner and outer panels of the furnace/air
handler that were previously removed when installing
the indoor coil.
COIL INSTALLATION
WARNING:
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical power
to the furnace and outdoor condensing unit.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
CAUTION:
The coil must be level to ensure proper
condensate drainage. An unlevel installation
may result in structural damage, premature
equipment failure, or possible personal injury.
Upflow Installations
1. Disconnect all electrical power to the furnace.
2. Install the coil case on the furnace air discharge opening
and level it as needed to ensure proper condensate
drainage. If needed, make a plate to adapt the coil to
the air discharge opening. See Figure 5 (page 6) for
coil dimensions.
3. Make and install the plenum over the coil. Insulate
as
required.
4. Seal the enclosure as required to minimize air leakage.
5. Connect the refrigerant lines as outlined in the
Refrigerant Line Connection section.
Downflow Installations
These coils may be installed in downflow applications. It
is required that the furnace and coil cabinets are securely
mounted together before setting in place. Fossil fuel
applications require the coil to be placed in the supply
air stream only.
Refrigerant Line Connections
System Depressurization
1. Remove the cap (Figure 1) from the end of the
liquid line.
2. Verify pressurization by depressing the Schrader valve
on the end of the liquid line. Listen for any escaping gas.
If there is no pressure, test the coil for leakage.
• If leakage is found, clearly mark the location of
the leak
and return the coil to the distributor for processing.
• If no leaks are found, the coil may be installed.
3. Depress the valve to relieve all pressure from the coil.
Suction
Line
Liquid
Line
Cap
Schrader
Valve
Figure 1. Suction & Liquid Line Locations