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11 - Mark and disconnect all combustion air pressure
tubing from cold end header collector box.
12 - Mark and remove wires from pressure switches.
Remove pressure switches. Keep tubing attached
to pressure switches.
13 - Disconnect the 4-pin plug from the combustion
air inducer. Remove two screws which secure
combustion air inducer to collector box. Remove
combustion air inducer assembly. Remove ground
wire from vest panel.
14 - Remove electrical junction box from the side of the
furnace.
15 - Remove cold end header box.
16 - Mark and disconnect any remaining wiring to
heating compartment components. Disengage
strain relief bushing and pull wiring and bushing
through the hole in the blower deck.
17 - Remove the primary limit from the vestibule panel.
18 - Remove two screws from the front cabinet ange
at the blower deck. Spread cabinet sides slightly to
allow clearance for removal of heat exchanger.
19 - Remove screws along vestibule sides and bottom
which secure vestibule panel and heat exchanger
assembly to cabinet. Remove two screws from
blower rail which secure bottom heat exchanger
ange. Remove heat exchanger from furnace
cabinet.
20 - Back wash heat exchanger with soapy water
solution or steam. If steam is used it must be below
275°F (135°C) .
21 - Thoroughly rinse and drain the heat exchanger.
Soap solutions can be corrosive. Take care to rinse
entire assembly
22 - Reinstall heat exchanger into cabinet making sure
that the clamshells of the heat exchanger assembly
are resting on the support located at the rear of the
cabinet. Remove the indoor blower to view this area
through the blower opening.
23 - Re-secure the supporting screws along the vestibule
sides and bottom to the cabinet.
24 - Reinstall cabinet screws on front ange at blower
deck.
25 - Reinstall the primary limit on the vestibule panel.
26 - Route heating component wiring through hole in
blower deck and reinsert strain relief bushing.
27 - Reinstall electrical junction box.
28 - Reinstall the cold end header box.
29 - Reinstall the combustion air inducer. Reconnect the
4-pin plug to the wire harness.
30 - Reinstall pressure switches and reconnect pressure
switch wiring
31 - Carefully connect combustion air pressure switch
hosing from pressure switches to proper stubs on
cold end header collector box.
32 - Reinstall condensate trap.
33 - Use securing screws to reinstall ue collar to the top
cap on the furnace. Reconnect exhaust piping and
exhaust drain tubing.
34 - Replace exible exhaust adapter tee on combustion
air inducer and ue collar. Secure using two existing
hose clamps.
35 - Reinstall burner box assembly in vestibule area.
36 - Reconnect ame roll-out switch wires.
37 - Reconnect sensor wire and reconnect 2-pin plug
from ignitor.
38 - Secure burner box assembly to vestibule panel
using four existing screws. Make sure burners line
up in center of burner ports.
39 - Reinstall gas valve manifold assembly. Reconnect
gas supply line to gas valve.
40 - Reinstall burner box cover.
41 - Reconnect 2-pin plug to gas valve.
42 - Replace the blower compartment access panel.
43 - Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
44 - Follow lighting instructions to light and operate
furnace for 5 minutes to ensure that heat exchanger
is clean and dry and that furnace is operating
properly.
45 - Replace heating compartment access panel.
Cleaning the Burner Assembly
1 - Turn o electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2 - Disconnect the 2-pin plug from the gas valve.
3 - Remove the burner box cover.
4 - Disconnect the gas supply line from the gas valve.
Remove gas valve/manifold assembly.
5 - Mark and disconnect sensor wire from the sensor.
Disconnect 2-pin plug from the ignitor at the burner
box.
6 - Remove four screws which secure burner box
assembly to vest panel. Remove burner box from
the unit.
7 - Use the soft brush attachment on a vacuum cleaner
to gently clean the face of the burners. Visually
inspect the inside of the burners and crossovers for
any blockage caused by foreign matter. Remove
any blockage.
8 - Reconnect the sensor wire and reconnect the 2-pin
plug to the ignitor wiring harness.
9 - Reinstall the burner box assembly using the existing
four screws. Make sure that the burners line up in
the center of the burner ports.
10 - Reinstall the gas valve manifold assembly.
Reconnect the gas supply line to the gas valve.
Reinstall the burner box cover.
11 - Reconnect 2-pin plug to gas valve.
12 - Replace the blower compartment access panel.
13 - Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
14 - Follow lighting instructions to light and operate
furnace for 5 minutes to ensure that heat exchanger
is clean and dry and that furnace is operating
properly.
15 - Replace heating compartment access panel.
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