Lennox 5625717, Информация об устройстве

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Page 51
Cleaning Heat Exchanger
If cleaning the heat exchanger becomes necessary, follow
the below procedures and refer to figure 1 when disas -
sembling unit. Use papers or protective covering in front of
furnace while removing heat exchanger assembly.
1 - Turn off electrical and gas supplies to the furnace.
2 - Remove the furnace access panels.
3 - Disconnect the wires from the gas valve.
4 - Remove gas supply line connected to gas valve.
Remove the burner box cover (if equipped) and
remove gas valve/manifold assembly.
5 - Remove sensor wire from sensor. Disconnect 2-pin
plug from the ignitor.
6 - Disconnect wires from flame roll-out switches.
7 - Disconnect combustion air intake pipe. It may be
necessary to cut the existing pipe to remove burner
box assembly.
8 - Remove four burner box screws at the vestibule
panel and remove burner box. Set burner box
assembly aside.
NOTE - If necessary, clean burners at this time.
Follow procedures outlined in Burner Cleaning
section on the next page.
9 - Loosen the clamps to the flexible exhaust coupling.
10 - 10 - Disconnect condensate drain line from the cold
end header box.
11 - Disconnect condensate drain tubing from flue
collar. Remove screws that secures the flue collar
into place. Remove flue collar. It may be necessary
to cut the exiting exhaust pipe for removal of the
fitting.
12 - Mark and disconnect all combustion air pressure
tubing from cold end header collector box.
13 - Mark and remove wires from pressure switch
assembly. Remove the assembly. Keep tubing
attached to pressure switches.
14 - Disconnect the 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.
15 - Disconnect the condensate drain line.
16 - Remove cold end header box
17 - . Remove electrical junction box from the side of the
furnace.
18 - 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.
19 - Remove the primary limit from the vestibule panel.
20 - Remove two screws from the front cabinet flange
at the blower deck. Spread cabinet sides slightly to
allow clearance for removal of heat exchanger.
21 - 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
flange. Remove heat exchanger from furnace
cabinet.
22 - Back wash heat exchanger with soapy water
solution or steam. If steam is used it must be
below 275°F (135°C) .
23 - Thoroughly rinse and drain the heat exchanger.
Soap solutions can be corrosive. Take care to rinse
entire assembly.
24 - Reinstall heat exchanger into cabinet making sure
that the clamshells of the heat exchanger assembly
is engaged properly into the support bracket on the
blower deck. Remove the indoor blower to view this
area through the blower opening.
25 - Re-secure the supporting screws along the vestibule
sides and bottom to the cabinet.
26 - Reinstall cabinet screws on front flange at blower
deck.
27 - Reinstall the primary limit on the vestibule panel.
28 - Route heating component wiring through hole in
blower deck and reinsert strain relief bushing.
29 - Reinstall electrical junction box.
30 - Reinstall the cold end header box.
31 - Reinstall the combustion air inducer. Reconnect the
plug to the wire harness.
32 - Reinstall pressure switches and reconnect pressure
switch wiring.
33 - Carefully connect combustion air pressure switch
tubing from pressure switches to proper ports on
cold end header collector box.
34 - Reconnect condensate drain line to the cold end
header box.
35 - Use securing screws to reinstall flue collar to the top
cap on the furnace. Reconnect exhaust piping and
exhaust drain tubing.
36 - Replace flexible exhaust adapter on combustion air
inducer and flue collar. Secure using two existing
hose clamps.
37 - Reinstall burner box assembly in vestibule area.
Secure burner box assembly to vestibule panel
using four existing screws. Make sure burners line
up in center of burner ports
38 - Reconnect flame roll-out switch wires.
39 - Reconnect sensor wire and reconnect 2-pin plug
from ignitor.
40 - Reinstall gas valve manifold assembly. Reconnect
gas supply line to gas valve.
41 - Reconnect the combustion air intake pipe.
42 - Reinstall burner box cover.
43 - Reconnect wires to gas valve.
44 - Replace the blower compartment access panel.