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10- Back wash using steam. Begin from the burner open-
ing on each clam. Steam must not exceed 275°F.
11- To clean burners, run a vacuum cleaner with a soft
brush attachment over the face of burners. Visually in-
spect inside the burners and crossovers for any block-
age caused by foreign matter. Remove any blockage.
FIGURE 22 shows burner detail.
12- To clean the combustion air inducer visually inspect
and using a wire brush clean where necessary. Use
compressed 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
inducer outlet.
18- Reconnect gas supply piping.
19- Turn on power and gas supply to unit.
20- Set thermostat and check for proper operation.
21- 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
after leak test has been completed. Do not use
matches, candles, flame or other sources of ignition
to check for gas leaks.
22- If a leak is detected, shut gas and electricity off and
repair leak.
23- Repeat steps 21 and 23 until no leaks are detected.
24- Replace access panel.
Remove five screws if necessary
(either side of cabinet)
Page 28
4
3
5
2
1
FIGURE 23
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