Electrical Controls and Wiring, A91249

PILOT HEAD V–NOTCH FALLS

DIRECTLY BELOW FRONT EDGE

OF BURNER CARRYOVER.

1/8″

A91249

Fig. 7ÐPosition of Pilot to Burner

(6.) Insert brush end of cable in lower opening of cell, and proceed to clean 2 lower passes of cell in same manner as 2 upper passes.

(7.) Repeat foregoing procedures until each cell in furnace has been cleaned.

(8.) Remove residue from each cell using vacuum cleaner.

(9.) Clean burner assembly using vacuum cleaner with soft brush attachment.

(10.) Reinstall cell inlet plates and burner assembly. Care must be exercised to center the burners in the cell openings.

9.After cleaning flue openings, check sealant on flue collector to ensure that it has not been damaged. If new sealant is needed, contact your dealer or distributor.

10.Clean and replace flue collector assembly, making sure all 8 screws are secure.

11.Reinstall 2 screws in relief box.

12.Reconnect wires to the following components:

a.Draft safeguard switch

b.Inducer motor

c.Pressure switch

d.Limit overtemperature switch

e.Gas valve

f.Edge connector leading to control box

13.Reconnect vent pipe to relief box. Replace vent pipe enclosure (downflow furnace only).

14.Replace blower access door only and secure with 2 screws (downflow furnace only).

15.Turn on electrical power and gas.

16.Set thermostat and check furnace for proper operation.

Never use a match or other open flame to check for gas leaks. Use a soap-and-water solution. A failure to follow this warning could result in fire, personal injury, or death.

17. Check for gas leaks.

18. Replace control access door.

ELECTRICAL CONTROLS AND WIRING

NOTE: There may be more than 1 electrical supply to unit.

The electrical ground for 115-v wiring must be maintained properly. Refer to Fig. 8 for field wiring information and to Fig. 9 for unit wiring information.

With power disconnected to unit, check all electrical connections for tightness. Tighten all screws on electrical connections. If any smoky or burned connections are noticed, disassemble the connec- tion, clean all parts and stripped wire, and reassemble properly and securely. Electrical controls are difficult to check without proper instrumentation; therefore, reconnect electrical power to unit and observe unit through 1 complete operating cycle.

The 24-v circuit contains an automotive-type, 3-amp fuse located on the main control board. Any direct shorts during installation, service, or maintenance could cause this fuse to blow. If fuse replacement is required, use ONLY a 3-amp fuse of identical size.

PILOT Ð Check the pilot and clean if necessary at the beginning of each heating season. The pilot flame should be high enough for proper impingement of the flame-sensing element (or thermo- couple) and to light the burners. Remove the accumulation of soot and carbon from the flame-sensing element (or thermocouple). Refer to Fig. 7 for proper location of pilot on burner assembly.

TROUBLESHOOTING Ð Page 8 contains a troubleshooting chart. This chart can be a useful tool in isolating furnace operation problems. Beginning with the word ``Start,'' answer each question and follow the appropriate arrow to the next item.

The chart will help identify the problem or failed component. After replacing any component, verify correct operating sequence as indicated by bold arrows.