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J-BOX
LOCATIONS
J−BOX
MOUNTING
SCREWS
J−BOX
MOUNTING
BRACKET
GROUND
SCREW
J−BOX COVER
Fig. 3 - - J- -Box Removal / Installation
7. Clean relief port on Condensate Trap with a thin wire or
paper clip, rinse with warm water and set aside.
8. Flush condensate lines with warm water.
9. Shake trap dry.
Remove J- -box and Main Harness
1. Remove the screw that secures the J- -box cover to the J- -box
bracket. See Fig. 3.
2. Disconnect the field wiring from the factory wiring and re-
move the ground wire from the green ground screw on the
J- -box bracket.
3. Remove factory wiring from the J- -box.
4. Disconnect the factory wires from the main limit switch.
5. Remove the screw that secures the door switch to the
blower shelf and the blower shelf door bracket. Remove
the screws from the blower shelf door bracket, and set the
bracket aside.
6. Remove main harness from the slot in the blower shelf.
Collector Box Removal
1. Remove the screws that secure the collector box to the heat
exchanger cell panel and set aside. See Fig 4.
2. Remove collector box gasket and discard.
3. Flush out the collector box with warm water including the
tube ports. Clean tube ports on collector box with a thin
wire or paper clip, rinse with warm water and set aside.
Collector Box Assembly
Fig. 4 - - Collector Box Removal / Installation
Heat Exchanger Assembly Removal
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts and servicing furnaces.
1. Remove the screws that attach the filler plate to the bottom
edge of the condensing heat exchanger assembly and cas-
ing.
2. Remove screws that secure the heat exchanger assembly to
A11299
the heat exchanger mounting brackets.
3. Pull assembly out of casing until the back edge of the heat
exchanger assembly is resting on the front edge of the
blower shelf.
4. Lift the heat exchanger assembly out of the casing and set
aside.
Remove Coupling Box
1. Remove the screws that secure the finger baffle from the
Coupling Box Cover. See Fig. 5.
2. Remove the screws that secure the Coupling Box Cover to
the rear of the Heat Exchanger Assembly.
3. Starting at the upper beveled edge of the coupling box, use
a putty knife or gasket scraper to get between the coupling
box cover and the Primary Cell Outlet panel to break the
silicone seal between the parts.
4. Pry upwards with the putty knife as you move around the
Coupling Box cover.
5. Once the Coupling Box cover is sufficiently loosened, re-
move the coupling box cover from the rear of the Heat Ex-
changer Assembly. See Fig. 6.
Separate Primary and Condensing Heat Ex-
changers
1. Remove the screws that attach the condensing heat ex-
changer assembly to the primary cell outlet panel and re-
move the screws that attach the condensing heat exchanger
outlet panel to the primary inlet panel.
2. Gently use a putty knife or gasket scraper to get between the
primary cell inlet panel and condensing heat exchanger if it
is needed to break the seal between the parts.
3. Repeat the procedure at the primary cell outlet panel and
containment plate attached to the inlet of the secondary heat
exchanger.
4
Gasket (2)
Adhesive to Face
Plug, Drain (4)
Collector Box Assembly
CAUTION
A11412
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