50
9/32˝
5/16˝
A05025
Fig. 51 --- Igniter Position--Side View
1-7/8”
A05026
Fig. 52 --- Igniter Position--Top View
A01050
Fig. 53 --- Cleaning Heat Exchanger Cell
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 Fig. 60.)
(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 furnace has
been cleaned.
(6.) Using vacuum cleaner, remove residue from each cell.
(7.) Using vacuum cleaner with soft brush attachment, 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 cooking spray or equivalent
(must not contain corn or canola oil, aromatic or halogenated
hydrocarbons or inadequate seal may occur) and RTV sealant
(G.E. 162, 6702, or Dow --Corning 738) are needed before
starting installation. DO NOT substitute any other type of RTV
sealant. G.E. 162 (P771-- 9003) is available through RCD in 3 --oz
tubes.
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. Securely
fasten vent connector to vent elbow with 2 field--supplied,
corrosion--resistant, sheet metal screws located 180¡ã
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.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never use a match or other open flame to check for gas
leaks. Use a soap-- and--water solution.
!
WARNING
19. Check for gas leaks.
20. Replace outer access door.
Step 3 —Sequence of Operation
NOTE: Furnace control must be grounded for proper operation
or control will lock out. Control is grounded through
green/yellow wire routed to gas valve and manifold bracket
screw .
Using the schematic diagram in Fig. 46, follow the sequence of
operation through the different modes. Read and follow the
wiring diagram very carefully .
NOTE: If a power interruption occurs during a call for heat (W),
the control will start a 90--sec blower--only ON period two
seconds after power is restored, if the thermostat is still calling for
gas heating. The red LED light will flash code 12 during the
58ST
To Next Page
Loading...
