Lennox International Inc SL280DFV, DAVE LENNOX SIGNATURE COLLECTION GAS FURNACE

12− To clean the combustion air inducer visually inspect and using a wire brush clean where necessary. Use com- pressed air to clean off debris and any rust.

13− Reinstall heat exchanger in vestibule. (Replace the five screws in the cabinet from step 10 if removed).

14− Reinstall collector box, combustion air assembly, inter- nal flue pipe and flue chase. Seal with high tempera- ture RTV. Reinstall all screws to the collector box and combustion air inducer. Failure to replace all screws may cause leaks. Inspect gaskets for any damage and replace if necessary.

15− Reinstall burner box, manifold assembly and burner box cover.

16− Reconnect all wires.

17− Reconnect top cap and vent pipe to combustion air in- ducer outlet.

18− Reconnect gas supply piping.

19− Turn on power and gas supply to unit.

20− Set thermostat and check for proper operation.

20− Check all piping connections, factory and field, for gas leaks. Use a leak detecting solution or other preferred means.

CAUTION

Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly af- ter leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks.

21− If a leak is detected, shut gas and electricity off and repair leak.

22− Repeat steps 21 and 23 until no leaks are detected.

23− Replace access panel.

Remove five screws if necessary

(either side of cabinet)

4

3

5

2

1

FIGURE 31

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