Lennox International Inc G61MP specifications Blower Speed Taps, Vi−Maintenance

D−Blower Speed Taps

Blower speed tap changes are made on the SureLight con- trol board. See figure 4. The unused tap must be secured on dummy terminals "PARK " on the SureLight board. The high heating tap is connected to the "HI HEAT " terminal and the low heating / continuous blower tap is connected to the "LO HEAT" terminal. The cooling tap is connected to the ap.

To change existing heat tap, turn off power then switch out speed tap on "HI HEAT" or T" with tap connected

to "PARK ". See table 20 for blower motor tap colors for each speed.

TABLE 20

VI−MAINTENANCE

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage.

Improper servicing could result in dangerous opera- tion, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace.

When servicing controls, label all wires prior to dis- connecting. Take care to reconnect wires correctly. Verify proper operation after servicing.

At the beginning of each heating season, system should be checked as follows by a qualified service technician:

Blower

Check the blower wheel for debris and clean if necessary. The blower motors are prelubricated for extended bearing life. No further lubrication is needed.

WARNING

The blower access panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal inju- ry or death.

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Filters

Filters should be inspected monthly. Clean or replace the filters when necessary to ensure proper furnace opera- tion. Replacement filters must be rated for high velocity airflow. Table 21 lists recommended filter sizes.

TABLE 21

Furnace	Filter Size
Cabinet Size	Side Return	Bottom Return
17−1/2"	16 X 25 X 1 (1)	16 X 25 X 1 (1)
21"	16 X 25 X 1 (1)	20 X 25 X 1 (1)
24−1/2"	16 X 25 X 1 (2)	24 X 25 X 1 (1)

Exhaust and air intake pipes

Check the exhaust and air intake pipes and all connections for tightness and to make sure there is no blockage. Electrical

1 − Check all wiring for loose connections.

2 − Check for the correct voltage at the furnace (furnace operating).

3 − Check amp−draw on the blower motor.

Motor Nameplate__________Actual__________

Winterizing and Condensate Trap Care 1 − Turn off power to the unit.

2 − Have a shallow pan ready to empty condensate water. 3 − Remove the drain plug from the condensate trap and empty water. Inspect the trap then reinstall the drain

plug.

Cleaning Heat Exchanger

If cleaning the heat exchanger becomes necessary, follow the below procedures and refer to figure 1 when disassem- bling unit. Use papers or protective covering in front of fur- nace while removing heat exchanger assembly.

IMPORTANT

Safety glasses and surgical mask should be worn when cleaning heat exchanger and or burner assembly.

1 − Turn off electrical and gas supplies to the furnace.

2 − Remove the upper and lower furnace access panels. 3 − Mark all gas valve wires and disconnect them from

valve.

4 − Remove gas supply line connected to gas valve. Re- move 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 − Remove burner box cover and remove four burner box screws at the vestibule panel and remove burner box. Set burner box assembly aside. G61MP−135 only − Remove and discard two additional shipping screws. See figure 41.

NOTE − If necessary, clean burners at this time. Follow procedures outlined in Burner Cleaning section.

8 − Loosen three clamps and remove flexible exhaust tee.