4
Downflow Installations
Downflow Electric Furnace:
1. Disconnect all electrical power to the furnace.
2. Select the appropriate coil conversion kit which includes
2 air filters, close-off plates (2 sets) and a coil hold down
bracket.
3. Remove the filter located at the top of the furnace
cabinet.
4. Remove the refrigerant line knockouts located at the
top and bottom of the furnace cabinet.
5. Install the coil and level it as needed to ensure proper
condensate drainage.
6. Secure the coil hold down bracket with screws.
7. Add air filters to the sides of the coil.
8. Cut the floor opening for the refrigerant lines and drain
line. See Figure 1 on page 3.
9. Connect the refrigerant lines as outlined in the
Refrigerant Line Connection section (page 4).
MOUNTING
HOLE
SMALL
PLATE
LARGE
PLATE
Figure 3. Bottom Close-Off Plates
SMALL
PLATE
TAB
LARGE
PLATE
TABS
OFFSET
MOUNTING
HOLES (2)
TABS
Figure 4. Close-Off Plates for Opening
at Top of Furnace
Figure 2. Close-Off Plate Assembly
SMALL
PLATE
LARGE
PLATE
TABS
MOUNTING
HOLE
OFFSET
Figure 5. Close-Off Plates
(Supplied w/ appropriate blower conversion package)
Downflow Furnace with Integral Coil Cabinet
or Optional Cabinet
1. Disconnect all electrical power to the furnace.
2. Remove the knockout in the left bottom corner of the
furnace and cut an appropriately sized hole in the floor.
See Figure 1.
NOTE:
For the optional cabinet, refer to
its installation instructions for assembly details.
3. Remove the interior coil panel. Install the coil and level
it as needed to ensure proper condensate drainage.
4. Remove the knockout for the refrigerant lines in the
secondary covers and replace in the furnace.
NOTE:
Modifications to the panel may be required.
5. Slide the close-off plates around the refrigerant lines
and install the provided dart clips. See Figure 2.
6. Snap the bushings around the lines and into the close-
off panels.
7. Connect the refrigerant lines as outlined in the refrigerant
lines section.
Refrigerant Line Connections
The total system operating charge of R-410A is in the
outdoor unit and is adequate for the matched listed system
including 15 feet of line set.
1. Remove the protective caps from the coil and refrigerant
line set couplings.
2. With a soft, dust-free cloth, carefully wipe clean all
coupling threads and seals to remove any dust or
material which could contaminate the refrigerant system.
3. Using refrigerant oil, lightly lubricate the diaphragm,
seal, and mating threads.
4. Connect the couplings as follows:
a.) Line up the refrigerant line with the coil coupling and
thread together by hand to ensure proper thread
mating. Hold the hex of the male coupling with a
wrench and slowly wrench tighten the union nut until
a definite resistance (bottoming out) is felt.
b.) Mark the position of the union nut (match lines on the
line coupling and the coil coupling), then tighten the
coupling an additional 1/4 turn to ensure a leakproof
connection. Use the Torque Values table (below) if
a torque wrench is used.
5. Check the system for leaks.
Summary of Contents for C84QA Series
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