Part number 550-100-305/0916
87
AquaBalance
TM
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
— C
OMBI
Boiler Manual
33
Maintenance
(continued)
Figure 114
)NSPECTINGANDCLEANINGHEATEXCHANGER
Inspect and clean the heat exchanger
Wait until heat exchanger/boiler is cooled down
before proceeding. Failure to do so can cause
severe injury.
1. See Figures 115 and 119.
2. Use a 10mm wrench or socket to remove the five (5) nuts that
secure the burner cover plate to the heat exchanger.
3. Remove the heat exchanger cover plate, gasket, burner and
its gasket.
4. Inspect the refractory for any damage, replace if necessary.
5. Remove
ignitor.
6. Before using water to clean the heat exchanger, remove the
control module. Label wires if they are not labeled. Set aside.
Remove all connectors and wire harnesses from the control
module and then remove the screw securing it to the bracket.
7. Use a vacuum cleaner to remove any accumulation on the
heating surfaces. This includes removing any pieces of refrac-
tory that may have dropped into the heat exchanger.
Figure 115
#LEANINGTHEHEATEXCHANGER
Figure 116
#LEANINGTHEHEATEXCHANGER
Figure 117
#LEANINGTHEHEATEXCHANGER
11. Dry with a clean rag.
12. Reinstall the spring.
13. Reinstall the burner, the burner gasket and ignitor.
14. Reinstall heat exchanger cover plate and gasket to heat
exchanger.
15. Tighten the heat exchanger cover plate’s five (5) 10mm
nuts using a torque wrench. The nuts must be secure, to a
torque of 20 inch-pounds.
Perform a complete start-up procedure when
putting the boiler back into service. See page 57
and all instructions for start-up and verification.
Include a soap suds leak test on all interior and
exterior gas piping after starting the boiler.
8. Lightly spray clean water on all of the boiler coils and
clean any residue off with (plastic only) brush. (Be careful
not to damage back refractory wall).
9. Wipe any residue off coils with a clean rag.
10. Spray clean water, to finish flushing combustion chamber.
