AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 115)

GF-135 Esteem 399 Low NOx Boiler
Chapter 17
OMM-0089_0A Installation, Operation & Maintenance Manual Maint. Procedures
17.20 HEAT EXCHANGER CLEANING
Cleaning the Heat Exchanger
1. Shut down the boiler:
• Follow the instructions in Section 12.4, "To Turn Off Gas to Appliance"
• Do not drain the boiler unless the boiler will be subject to freezing conditions.
• Do not drain the boiler if freeze protection fluid is used in the system.
2. Allow the boiler to cool down to room temperature before servicing.
3. Disconnect the gas piping and gas valve wire harness connector.
4. Disconnect the wiring harness connectors from the blower and remove the blower retaining
screws or nuts. Remove the blower from the unit.
5. Remove the mounting nuts securing the burner mounting plate to the heat exchanger and set
aside.
6. Carefully remove the burner mounting plate assembly from the heat exchanger. Ensure
combustion chamber insulation is not damaged during removal of burner mounting plate
assembly. See warning in Section 17.22.
7. Carefully remove the combustion chamber insulation from the heat exchanger and set aside.
See warning in Section 17.22.
8. Use a vacuum cleaner, compressed air or water to remove any accumulation from the heat
exchanger flue ways. Do not use any solvent.
9. Re-install the combustion chamber insulation onto the heat exchanger.
10. Re-assemble the burner mounting plate assembly onto the heat exchanger. Ensure the
burner plate gasket and combustion chamber insulation is in place and not damaged, replace
gasket and insulation if necessary. See warning in Section 17.22.
11. Re-assemble the blower onto the burner mounting plate and reconnect the wiring harness
connectors.
12. Reconnect the gas piping and wire harness to gas valve. Check for leaks, repair if necessary.
13. Close isolation valves on the boiler water piping to isolate the boiler from the heating system.
14. Attach a hose to the boiler drain valve and flush the boiler thoroughly with freshwater by
using the purge valves to allow water to enter through the make-up waterline to the boiler.
15. Once the boiler has been completely flushed, return the boiler and system piping back to
operation.
16. Perform the required startup and checkout procedures as outlined in Chapters 11, 12, 13,
and 14.
17.21 REVIEWING MAINTENANCE REQUIREMENTS WITH OWNER
Ensure the owner understands the importance to perform the maintenance schedule specified in
this manual.
Remind the owner of the importance to call a licensed contractor should the unit or system
exhibit any unusual behavior.
Page 115 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288