Technical data

Maintenance

SU54/5, SU80/5, SU100/5 – 6 720 808 532 (2013/08)14

▶ Remove the cleanout cover [3], magnesium anode [5] and cleanout

cover gasket [4].

Fig. 17 Removing the cleanout cover SU54/5

[1] PS top cover

[2] Hex bolts

[3] Cleanout cover

[4] Cleanout 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] Cleanout cover

[4] Magnesium anode

[5] Cleanout cover gasket

[6] Inspection port

9.2 Descaling/cleaning the DHW tank

▶ Check the DHW tank interior for scale deposits (calcium).

Should scale deposits 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.

Extremely tough scale deposits inside the DHW tank can be removed by

chemical means. 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

6 720 801 769-07.1ITL

6 720 805 397-09.1ITL

CAUTION: Risk of tank damage due to damaged enamel.

▶ Never use hard objects or tools with sharp edges to

clean the interior of the tank