Water-Side Maintenance - A.O. Smith ADM - 115 Installation & Service Manual

12
12.3 Water-side
maintenance
12.3.1
12.3.2
12.3.3
62
Performing maintenance
Introduction
The following steps must be carried out on the water side:
1. Checking the anodes.
2. Descaling and cleaning the
Checking the anodes
Timely replacement of the anodes extends the service life of the appliance. The
appliance's anodes must be replaced as soon as they are 60% or more
consumed (take this into consideration when determining the maintenance
frequency).
Warning
The draught diverter and the cover may be hot.
1. Remove the protective cover from the control column by unscrewing the 4
screws in the cover.
2. Detach the wiring for the flue gas thermostat from the connector block and
remove the cable from the strain relief.
3. Remove the cable clamps holding the flue gas thermostat cable.
4. Disconnect the draught diverter from the flue gas discharge.
5. Undo the screws on the draught diverter.
6. Remove the draught diverter from the appliance.
7. Undo the screws of the lid in the top side of the appliance.
8. Remove the lid from the appliance.
9. Remove the sealing ring from the appliance.
10. Loosen the anodes using suitable tools.
11. Check the anodes, and replace them if necessary.
12. Now also check the flue baffles
necessary, replace them.
13. Place a new sealing ring on the rim of the tank and re-fit the lid.
14. Fit the draught diverter
15. Feed the cable of the flue gas thermostat through the strain relief and attach
the wiring to the connector block
16. Refit the cable clamps to the appliance and draught diverter.
17. Re-fit the protective cover.
Descaling and cleaning the tank
Scale and lime buildup prevent effective conduction of the heat to the water.
Periodic cleaning and descaling prevents buildup of these deposits. This
increases the service life of the appliance, and also improves the heating
process.
Take the rate of scale formation into account when deciding on maintenance
frequency. Scale formation depends on the local water composition, the water
consumption and the water temperature setting. A water temperature setting of
maximum 60°C is recommended for prevention of excessive scale buildup.
To ensure the perfectly watertight sealing of a cleaning opening, the gasket (6),
O-ring (7), sealing rings (4), bolts (3) and possibly the lid (5) should be replaced
with new components after opening (see the figure). A special set is obtainable
from the supplier/manufacturer.
tank.
(12.4.4 "Checking the flue
(3.9.2 "Fitting the draught diverter").
(14.2 "Electrical Diagrams
Instruction manual ADM
s
baffles"). If
ADM").