Maintenance - fothermo PVB-30-AC Bedienungsanleitung

EN
ment and damage to the heating elements and
the water heater.
Formation of legionella
Due to the small volume of the hot water tanks, the
risk of the formation of legionella in the system is
almost excluded. Nevertheless, to take precautions,
the following measures are recommended:
• Supply of fresh water or regular water withdra-
wal.
• Heating the water frequently to at least 60 °C.
• It is recommended to change the water after
the appliance has not been used for more than
one month.

MAINTENANCE

IMPORTANT! Before maintenance and servicing,
disconnect the boiler from the mains and other
energy sources.
IMPORTANT! The cover may only be opened by qua-
lified personnel.
Repair instructions
All electronic repair work may only be carried out by
a qualified electronic technician. There is a risk of
injury. Modifying the cables and electronics voids the
warranty. The cables of the circuit (DC) of the solar
modules are marked red and black.
The color-coding of the cables of the AC post-heating
(230V) are as follows:
• Neutral conductor (N) - blue
• Protective conductor (PE) - green/ yellow
• 230V AC - phase/ load (L) - brown
Corrosion protection
Every water heater features an enamelled water tank
with additional corrosion protection. This corrosion
protection consists of a magnesium anode (sacrifi-
cial anode). The anode is a wearing part (i.e. it we-
ars out during normal operation of the unit). The
average life span is about 3 years, which depends
particularly on the operating mode of the appliance
as well as the characteristics of the water to be hea-
ted. The condition of the anode should be checked
at regular intervals and, if necessary, replaced by a
service specialist authorized by the manufacturer
or distributor.
Compliance with the deadline and the timely re-
newal of the anode are important conditions for
efficient corrosion protection of the water tank. The
exam-ination and the renewal of the anode are not
included in the warranty obligations of the manu-
facturer nor the dealer. To ensure the safe operation
of the water heater in regions with calcareous water,
it is recommended to clean the water tank regularly
from accumulated limestone. Such cleaning should
be carried out at least every two years, or more fre-
quently in regions with calcareous water. Deposits
on the enamel coating do not need to be scraped off,
just wiped off with a dry cotton cloth. The regular
cleaning and removal of the limescale is essential to
ensure the safe operation of the appliance. Whilst
cleaning the anode of the enamelled water tank
should also be checked. These services are not part
of the warranty scope and must be carried out by
qualified persons. The regulations for the inspection
of the anode protection and renewal of the anode, as
well as the removal of the collected limestone, must
be observed both during and after the expiration of
the warranty period for the appliance.
Combined check and pressure relief valve
To guarantee the proper and safe operation of the
water heater, regularly check the combined check
and pressure relief valve for reduced permeability.
For this purpose, lift the small lever and wait approx.
30-60 seconds until a strong stream of water flows
out of the valve opening on the side. This check
must be carried out after filling the tank with water,
at 2-week intervals and after failure and restoration
of the water supply. If no water or only a thin stre-
am flows out of the valve opening, this indicates a
malfunction. A possible contamination of the water
pipe might be present. The fault must be eliminated
before commissioning.
Cleaning
The outer casing and the plastic parts of the water
heater should only be cleaned with a lightly moiste-
ned cotton cloth, free of aggressive and/or scouring
agents. Do not clean the appliance with a steam
cleaner. The water heater may only be put back
into operation after the moisture has completely
vanished.
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