9
Maintenance
SU54.5 | SU80.5 | SU100.5 – 6 720 819 292 (2017/11)
14
▶ Remove the handhole cover [3], magnesium anode [5] and handhole
cover seal [4].
Fig. 17 Removing the cleanout cover SU54/5
[1]
PS top cover
[2]
Hex bolts
[3]
Handhole cover
[4]
Handhole cover gasket
[5]
Magnesium anodes
[6]
Inspection port
Fig. 18 Removing the cleanout cover SU80/5, SU100/5
[1]
Cleanout cover shroud
[2]
Hex bolts
[3]
Handhole cover
[4]
Magnesium anode
[5]
Handhole cover gasket
[6]
Inspection port
9.2
Descaling/cleaning the tank
▶ Check the DHW tank interior for scale deposits (calcium).
Should limescale be discovered inside the DHW tank, proceed as
follows:
▶ Hose down the inside of the DHW tank with a “high-pressure” (approx.
58 – 72.5 psi (4 - 5 bar) gauge pressure) cold water jet.
You can increase the cleaning effect by heating up the heat exchanger
in the drained tank before cleaning. The thermal shock effect releases
scale deposits more easily from the coil-type heat exchanger.
▶ Use a wet & dry vacuum cleaner with plastic suction hose to remove
the residues.
Should thick limescale be discovered inside the DHW tank, it can be
removed chemically. We recommend that you have a qualified
contractor carry out the chemical cleaning operation.
Fig. 19 Hose down the inside of the tank as shown in the example
SU80/5, SU100/5
6 720
8
01 769-07.1ITL
1
2
3
4
5
6
6 720 805 397-09.1ITL
NOTICE:
Risk of tank damage due to damaged enamel.
▶ Never use hard objects or tools with sharp edges to
clean the interior of the tank
