11
7.1 Water
Circuit
The inspection of the water circuit is limited to any filters that may have been field-installed, and the performance of
leak tests. Dirty water filters have to be cleaned and replaced, if necessary.
7.2 Air Circuit
The maintenance activities are limited to cleaning the fin-type heat exchanger (only) as required.
Caution!
Hazard of injury from sharp-edged fins. Fins must not be distorted or damaged !
If air filters are used, these must be regularly checked for contamination and to be cleaned or replaced, if
necessary.
7.3 Sacrificial
Anode
The sacrificial anode installed in the domestic water tank for corrosion protection purposes, must be checked
electrically on a regular basis, at least every two years after commissioning, and be replaced, if necessary. The
electrical check is to be conducted by means of a suitable ammeter without draining the water in the tank.
Procedure:
n
Withdraw PE wire from tab of sacrificial anode.
o
Connect ammeter (0...50 mA) between PE conductor and tab.
p
Evaluation of wear of sacrificial anode:
Measured value > 1 mA
➪
sacrificial anode is okay.
Measured value < 1 mA
➪
sacrificial anode must be checked or replaced.
If an unambiguous electrical check is not possible, it is recommended that a visual inspection by an expert be
performed.
(For a replacement of the sacrificial anode that may be necessary [to be performed by an expert], the water must
be drained from the tank via the drain valve (to be provided upon installation – see appendix).
Caution: Protective anodes that are impaired in their function will reduce the life of the unit!
The sacrificial anode is screwed into the storage tank below
the immersion heater
(covered with a plastic cap)
Fig. 6:
sacrificial anode
