Buderus Logalux, Installation And Maintenance Instructions Manual

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9
Maintenance
Logalux LT160/1 | LT200/1 | LT300/1 – 6 720 811 745 (2021/10) 15
9 Maintenance
▶ Allow the DHW tank to cool down sufficiently before performing any
maintenance.
▶ Remedy all faults immediately.
▶ Use original spare parts only!
▶ The tank must be inspected annually and maintained as required.
▶ Check the T&P safety valve annually.
9.1 Preparing the DHW tank for cleaning
▶ Disconnect electrical power from the heating system.
▶ Remove front cover of tank (

Fig. 12 [1], page 12).
▶ To do so, loosen the 4 screws [3] on the sides of the front cover.
▶ Remove front cover of tank [1] and the thermal insulation element
[2].
▶ Drain the DHW tank.
▶ To do so, close the shut-off valve for cold water inlet and the open
drain valve.
▶ To vent the system, open the air vent valve or the highest faucet.
Fig. 16 Removing the cleanout cover
[1] Hex bolts
[2] Handhole cover
[3] Handhole cover gasket
[4] Magnesium anode
▶ Unscrew the hex bolts (

Fig. 16 [1]) from the handhole cover [2].
▶ Remove the handhole cover together with the handhole cover gasket
[3] and the magnesium anode [4] from the DHW tank.
9.2 Descaling/cleaning the tank
▶ Check the DHW tank interior for scale deposits (calcium).
If scale deposits have formed in the DHW tank:
▶ Hose down the interior of the tank with a "high-pressure"
(~ 58...72.5 psi (~ 4...5 bar)) jet of cold water (

Fig. 17).
▶ Use a wet/dry vacuum with a plastic suction pipe to remove any
residues.
If extremely encrusted scale deposits have formed in the DHW tank:
▶ Hire someone to perform the chemical cleaning.
Fig. 17 Hosing down the interior of the DHW tank
WARNING: Risk of scalding from hot water!
Hot water can cause scalding.
▶ Prior to cleaning, allow the DHW tank to cool down
sufficiently.
1
2 3 4
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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
You can increase the cleaning effect by heating up the
heat exchanger in the drained tank before spraying out.
The thermal shock effect releases scale deposits more
easily from the coil-type heat exchanger.
WARNING: Danger from improper use of the cleanser.
▶ Have a qualified contractor carry out the chemical
cleaning operation.
NOTICE: The enamel layer may be damaged if the acid
is too strong.
▶ Have a qualified contractor carry out the chemical
cleaning operation.
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