Nortek C7BA, Manual

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3
• 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.
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 8)
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.
Horizontal Installations
C7 coils can be installed horizontally, but it is required that
the furnace and coil cabinets be securely mounted together
before setting in place. A horizontal drain pan kit must also
be installed under the coil. Refer to
Table 3
,
Table 4
, or
Table
5
for available part numbers.
Horizontal Left Installations
1. Disconnect all electrical power to the furnace.
2. Remove the coil access door.
3. Remove the plug and knockout from one of the threaded
holes in the horizontal drain pan.
CAUTION:
The knockout must be removed and discarded
to ensure proper condensate drainage. Improper
drainage may result in structural damage, premature
equipment failure, or possible personal injury.
4. Install plug (from horizontal drain pan) in the open drain
hole in the drain pan at the bottom of the unit. This will
block bypass air from entering the system.
5. Remove the drain line knockout from the coil access door.
This will allow access to the horizontal drain.
6. Install drain pan extension (if supplied with unit).
TXV KIT P/N SIZE OF A.C. OR H.P. (TONS)
R-22
REFRIGERANT
920662A 1.5 or 2
920663A 2.5
920664A 3
920665A 3.5
920666A 4
920667A 5
R-410A
REFRIGERANT
920668A 1.5 or 2
920669A 2.5
920670A 3
920671A 3.5
920672A 4
920673A 5
Table 1. TXV Kit Part Numbers
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 equipment.
• 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.
General Information
C7 Series indoor cased coils are designed for upflow,
downflow, or horizontal applications and are equipped with
braze type refrigerant connections for easy installation. If a
TXV is not installed but required for your application, see
Table 1
to determine the proper kit based on tonnage and
refrigerant type of the unit.
• 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 3
,
Table 4
, or
Table 5, (page 7)
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.
• Horizontal installations require a horizontal drain pan kit to
be installed. See
Table 3
,
Table 4
, or
Table 5
for available
part numbers.