A.O. Smith SGS-28, Installation, User And Service Manual

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Fig. Cleaning opening
1
IMD-0080 R1
Remove the cover plate (1) on the outer jacket (see the figure).
Undo the bolts.
Remove the cover and the gasket.
Inspect the tank and remove the loose scale deposits and contamination.
If the scale cannot be removed by hand, descale the water heater with a descaling
agent. Contact the supplier/manufacturer for advice on what descaling agent to use.
Close the cleaning opening. To avoid damage to the tank, tighten the bolts that
fasten the lid with a torque no greater than 50 Nm. Use suitable tools for this.
10.2.2 Clean the condensate drain
To prevent blockages, it is essential to clean the condensation water discharge and
condensation trap regularly.
10.3 Gas-side maintenance
Do gas side maintenance when the water heater does not operate correctly, the air
pressure differential is not correct and/or the CO
2
value is not correct.
To do gas side maintenance:
Clean the burner (see section 10.3.1)
Clean the heat exchanger (see section 10.3.2)
10.3.1 Clean the burner
Detach the burner.
Remove all contamination present on the burner.
Fit the burner.
10.3.2 Clean the heat exchanger
Detach the burner.
Clean the combustion chamber of the heat exchanger using a vacuum cleaner and a
soft brush.
Detach the chimney flue.
Clean the end of the heat exchanger using tap water.
Fit the burner.
Fit the chimney flue.
Note
Check the pressure differential again after cleaning. If the pressure differential is too low
following cleaning, please contact the supplier of the water heater.
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