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10.2.3 Descale the tank
To descale and clean the tank:
1. Decommision the water heater (see 8.8).
2. Loosen the two screws to remove the cover
plate on side of the tank.
3. Push the isolating material aside to see the
cleaning opening.
4. Loosen the 6 bolts (4).
5. Remove the cleaning opening cover (3).
6. Remove the gasket (2).
7. Inspect the tank and remove the loose scale
deposits and contamination:
a) Remove the scale and contamination by
hand.
b) If necessary use a descaling agent to
remove the scale and contamination from
the tank. Contact A.O. Smith for advice
on what descaling agent to use.
8. Replace the gasket.
9. Close the cleaning opening.
10. Use a torque wrench to tighten the bolts with
a maximal torque of 50 Nm to prevent
damage to the tank
11. Put the isolating material in place.
12. Put the cover plate in place and tighten the
two screws.
13. Fill the water heater.
Fig. Cleaning opening
10.3 Gas-side maintenance
Do gas side maintenance when the water heater
does not operate correctly.
To do gas side maintenance:
•
Clean the burners (see 10.3.1)
•
Clean the combustion chamber (see 10.3.2)
0313126_BTL_UKUK_V1.1, 30-11-2018
10.3.1 Clean the burners
To clean the burners:
1. Remove the outer door.
2. Close the main gas supply and/or the manual
gas valve, refer to Installation diagram (see
8.3).
3. Disconnect the cable from the piezo igniter.
4. Disconnect the two slide contacts of the
T.R.S.
5. Disconnect the pilot pipe from the gas control
valve.
6. Disconnect the thermocouple from the gas
control valve.
7. Disconnect the burner tube from the gas
control valve.
Fig. Disconnect the burners
8. Loosen the two bolts to disconnect the
burners from the combustion chamber.
Fig. Loosen the bolts
19
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