SERVICE - CLEAN THE HEAT EXCHANGER
3. Vacuum large cone deposits from bottom of heat exchanger.
4. Use a long, thin brush to brush the inside surfaces of the heat exchanger.
5. Vacuum carbon brushed from heat exchanger surfaces that will fall to the bottom of the heat
7. Install burner back plate as described in WP 0050 00.
After cleaning heat exchanger it is not unusual to see a small amount of light smoke
when unit is started. The smoke should clear within 30 minutes. If smoke is heavy and
black after cleaning heat exchanger, shut unit off and troubleshoot for excessive fuel or