Repair Parts List - Lennox MERIT Series Installation Instructions Manual

Downflow air discharge

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Installation instructions manual (55 pages)

Care and operation instructions manual (30 pages)

User's information manual (11 pages)

Table of Contents

3 - Clock gas meter to ensure that the unit is operating at

the specified firing rate for each stage of operation.

Check the supply pressure and the manifold pressure

on both low fire and high fire. If manifold pressure

adjustment is necessary, consult the Service

Literature for unit specific information on adjusting

gas pressure. Not all gas valves are adjustable.

Verify correct temperature rise..

Winterizing and Condensate Trap Care

1 - Turn off power to the furnace.

2 - Have a shallow pan ready to empty condensate

water.

3 - Remove the clean out cap from the condensate trap

and empty water. Inspect the trap then reinstall the

drain plug.

Cleaning the Burner Assembly (if needed)

1 - Turn off electrical and gas power supplies to furnace.

Remove upper and lower furnace access panels.

2- Disconnect the 2-pin plug from the gas valve. Remove

the burner box cover (if equipped).

3- Disconnect the gas supply line from the gas valve.

Remove gas valve/manifold assembly.

4- Loosen clamps and remove combustion air intake

flexible connector (if equipped).

5- Mark and disconnect sensor wire from the sensor.

Disconnect plug from the ignitor at the burner box.

Remove four screws which secure burner box

assembly to vest panel. Remove burner box from the

unit.

6- Use the soft brush attachment on a vacuum cleaner

to gently clean the face of the burners. Visually

inspect the inside of the burners and crossovers for

any blockage caused by foreign matter. Remove any

blockage.

7- Reinstall the burner box assembly using the existing

four screws. Make sure that the burners line up in the

center of the burner ports.

8- Reconnect the sensor wire and reconnect the 2-pin

plug to the ignitor wiring harness.

9- Reinstall combustion air intake flexible connector (if

equipped), secure using existing clamps.

10- Reinstall

the

gas

Reconnect the gas supply line to the gas valve.

Reinstall the burner box cover.

valve

manifold

assembly.

11 - Reconnect plug to gas valve.

12 - Replace the blower compartment access panel.

13 - Refer to instruction on verifying gas and electrical

connections when re-establishing supplies.

14 - Follow lighting instructions to light and operate

furnace for 5 minutes to ensure that heat exchanger

is clean and dry and that furnace is operating

properly.

15 - Replace access panel.