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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
C74 Series indoor cased coils are designed for upflow,
downflow, or horizontal applications and are equipped with
braze type refrigerant connections for easy installation.
• Check the coils and confirm that it's suitable for
application with the intended outdoor unit.
• 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 or Table 2,
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 1
• 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.
and allowances
for available part numbers.
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 2 (page 6)
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
C74BA 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
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).
NOTE: The holes in the drain pan extension should be
pressed over the nibs molded into the drain pan. Which
pair of holes to use will depend on whether the unit is
installed horizontal left or horizontal right. Verify proper
positioning for clearance thru the top of the coil cabinet
before affixing. The drain pan extension can be installed
and removed after the ductwork has been attached to the
cased coil.
7. Connect the refrigerant lines as outlined in the Refrigerant
Lines Connection section.
8. Seal the enclosure as required to minimize air leakage.
9. Reinstall the coil access door.
10. Restore electrical power to the furnace.
Horizontal Right 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.
for coil dimensions.
Table 1
for
3
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