Maintenance
58
Instruction manual DR-LA
9
s
9.3
Water-side mainte-
nance
9.3.1
Introduction
The following steps should be carried out on the water side:
1.
2.
Descaling and cleaning the heater
.
9.3.2
Checking the anodes
Timely replacement of the anodes extends the service life of the water heater.
The anodes that are present must be replaced as soon as they are 60% or more
used up (take this into consideration when determining the maintenance
frequency).
Take care
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 water heater.
7. Undo the screws of the cover on the top of the water heater.
8. Remove the cover from the water heater.
9. Remove the sealing ring from the hot water tank.
10. Loosen the anodes using suitable tools (27 mm A/F).
11. Check the anodes and if necessary, replace them.
12. Now also check the flue baffles. Replace them, if necessary. See paragraph
9.4.4 Checking the flue baffles
13. Fit a new sealing ring around the edge of the hot water tank and replace the
cover.
14. Fit the draught diverter. See paragraph
3.9.2 Fitting the draught diverter
15. Feed the cable of the flue gas thermostat through the strain relief and attach
the wiring to the connector block. See appendix
1.2.2 Electrical diagram DR-LA 110 (LP gas)
16. Refit the cable clamps to the water heater and draught diverter.
17. Refit the protective cover.
9.3.3
Descaling and cleaning the heater
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
O
c is recommended for prevention of excessive scale buildup.
To guarantee a good, watertight seal around the cleaning opening, the gasket ,
O-ring
g
, spring washers, bolts and if necessary, the lid
c
should be replaced
with new parts before reassembly. See
. A special set is obtainable
from Hamworthy for this purpose.
