Sequence Of Operation - International comfort products N8MXL Installation Instructions Manual

Figure 45 − Igniter Position−Side View
Figure 46 − Igniter Position−Top View
NOTE: The materials needed in item 9 can usually be
purchased at local hardware stores.
(1.) Attach variable−speed, reversible drill to the end
of spring cable (end opposite brush).
(2.) Insert brush end of cable into the outlet opening
of cell and slowly rotate with drill. DO NOT force
cable. Gradually insert cable into upper pass of
cell. (See Figure 47 )
(3.) Work cable in and out of cell 3 or 4 times to obtain
sufficient cleaning. DO NOT pull cable with great
force. Reverse drill and gradually work cable out.
(4.) Insert brush end of cable in burner inlet opening
of cell, and proceed to clean 2 lower passes of cell
in same manner as upper pass.
(5.) Repeat foregoing procedures until each cell in fur-
nace has been cleaned.
(6.) Using vacuum cleaner, remove residue from
each cell.
(7.) Using vacuum cleaner with soft brush attach-
ment, clean burner assembly.
(8.) Clean flame sensor with fine steel wool.
(9.) Install NOx baffles (if removed).
(10.) Reinstall burner assembly. Center burners in cell
openings.
10. Remove old sealant from cell panel and collector box
flange.
11. Spray releasing agent on the heat exchanger cell panel
where collector box assembly contacts cell panel.
NOTE: A releasing agent such as a vegetable oil cooking
spray that does not contain corn oil, canola oil, halogenated
hydrocarbons or aromatic content, which may prevent an
inadequate seal from occuring, and RTV sealant such as
42
G.E. RTV 162, G.E. RTV 6702, or Dow−Corning RTV 738
sealant are required. DO NOT substitute any other type of
RTV sealant.
A05025
1−7/8"
47.6 mm
A05026
Step 6 —Sequence of Operation
NOTE:
operation or control will lock out. Control is grounded through
green/yellow wire routed to gas valve and manifold bracket
screw.
Specifications are subject to change without notice.
12. Apply new sealant to flange of collector box and attach
to cell panel using existing screws, making sure all
screws are secure.
13. Reconnect wires to the following components. (Use
connection diagram on wiring label, if wires were not
marked for reconnection locations.):
a. Draft safeguard switch.
b. Inducer motor.
c. Pressure switch(es).
d. Limit over−temperature switch.
e. Gas valve.
f. Hot surface igniter.
g. Flame−sensing electrode.
h. Flame rollout switches.
i. Install NOx baffles (if removed).
14. Reinstall internal vent pipe, if applicable.
15. Reinstall vent connector on furnace vent elbow. Se-
curely fasten vent connector to vent elbow with 2 field−
supplied, corrosion−resistant, sheet metal screws loc-
ated 180_ apart.
16. Replace blower access door only, if it was removed.
17. Set thermostat above room temperature and check
furnace for proper operation.
18. Verify blower airflow and speed changes between
heating and cooling.
19. Check for gas leaks.
20. Replace outer access door.
Figure 47 − Cleaning Heat Exchanger Cell
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Never purge a gas line into a combustion chamber.
Never test for gas leaks with an open flame. Use a
commercially available
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
Furnace control must be grounded for proper
A91252
soap solution made
441 01 1421 01