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CAUTION:
The knockout must be removed and discarded
to ensure proper condensate drainage. Failure to
do so may result in structural damage, premature
equipment failure, or possible personal injury.
4. Place the horizontal drain pan on the opposite side of the
coil. NOTE: If unit has 2 sets of knockouts, remove the
other set of knockouts in the coil spacing plates and insert
support rod.
5. 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.
6. Slide the coil and the horizontal drain pan assembly back
into the unit.
7. Remove the drain line knockout from the coil access door.
This will allow access to the horizontal drain.
8. 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.
9. Connect the refrigerant lines as outlined in the Refrigerant
Lines Connection section.
10. Seal the enclosure as required to minimize air leakage.
11. Reinstall the coil access door.
12. Restore electrical power to the furnace.
Downflow Installations
C74 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
IMPORTANT NOTE TO INSTALLER
C74 Coils are not factory charged with refrigerant. It will
be necessary to evacuate the indoor coil and lineset
prior to charging. Refer to the outdoor unit installation
manual for detailed charging instructions.
Figure 1. Suction & Liquid Line Locations
4
System Depressurization
1. Remove the cap
(Figure
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.
4. Remove and discard the valve core and valve core holder
on the liquid line.
5. Remove the rubber plug from the suction line.
Connecting the Linesets - Cased Coils
1. Remove the grommet from the suction line, making note
of its orientation and fit.
2. Remove the coil access door.
3. Remove the rubber plug from the suction line.
4. Route and cut both lineset tubes to proper length in
accordance with the outdoor unit specifications. Verify the
ends are round, clean, and free of any burrs.
5. Place the grommet on the suction line of the lineset.
NOTE: DO NOT install the grommet in the door cutout at
this point. Allow sufficient distance to braze joint.
6. Connect the suction and liquid lineset tubes.
CAUTION:
It is recommended that a wet rag be wrapped around
the suction line in front of the close off plate before
applying heat. Failure to keep components cool
during brazing may result in structural damage,
premature equipment failure, or possible personal
injury.
7. Braze the individual connections with dry nitrogen flowing
through the joints.
IMPORTANT NOTE:
To prevent internal oxidation and scaling from occuring,
braze all connections with dry nitrogen flowing through
the joints.
8. Install the grommet in the door cutout. Verify the grommet
is evenly aligned around the tube and securely positioned
in the door cutout.
1) from the end of the liquid line.
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