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4 PVB-10, PVB-30, PVB-80 www.fothermo.com
EN – User Manual
GENERAL WARNINGS
Be sure to carefully read the instructions and warnings
in this manual before installing and operating the
water heater. The information contained in this manual
is intended to familiarize you with the water heater, the
rules of its correct and safe operation, and the
minimum requirements for its maintenance and
servicing. Furthermore, you are obliged to make this
manual available to the qualified persons who will
install and potentially repair the appliance. The
installation of the water heater and the verification of
its functionality is not within the distributor's warranty
obligation nor the manufacturer.
These instructions should always be kept near the
appliance for future reference. Compliance with the
rules here described is part of the measures for the safe
use of the product and is considered part of the
warranty conditions.
SAFETY INSTRUCTIONS
WARNING! There is a risk of burns or scalding when
using the appliance!
WARNING! Children must not play with the appliance.
Cleaning and maintenance must not be carried out by
children without supervision.
IMPORTANT! Only qualified persons may install the
water heater and connect it to the water pipe following
the specifications given in this manual and the relevant
local regulations. The protective devices provided or
recommended by the manufacturer, as well as all other
assemblies, are UNCONDITIONALLY to be installed!
IMPORTANT! Be sure to fill the water heater with water
before connecting it to the electrical supply! Failure to
comply with the electrical connection conditions
affects the safety of the appliance, whereby the water
heater must not be operated.
IMPORTANT! Observe the maximum permissible
pressure (see chapter: Technical data).
FURTHER IMPORTANT NOTES
• The appliance is under pressure. During heating,
expansion water may drip from the pressure relief
valve.
• Operate the pressure relief valve regularly to
prevent it from being stuck, e.g. due to limescale
deposits.
• Install a type-tested pressure relief valve in the
cold-water supply line. Note that depending on
the pressure of the supply, you may also need a
pressure reducing valve.
• Mount the pressure relief valve with the opening
facing down.
• Mount the pressure relief valve and the drainpipe
with a steady downward slope in a frost-free
room.
• Dimension the drainpipe to allow the water to
flow off unhindered when the pressure relief valve
is fully open.
• The pressure relief valve opening must remain
open to the atmosphere.
• This unit contains batteries which are not
replaceable. However, their defect does not limit
the basic functionality.
• This unit may be operated up to an altitude of
4000 m above sea level.
TECHNICAL DATA
This water heater can provide hot water from the public
water supply system for several consumers. The water
used for heating must comply with the requirements in
the normative documents for domestic water, in
particular: Chloride content up to 250 mg/l; electrical
conductivity more than 100 µS/cm, pH value 6,5-8 for
enamelled hot water tanks. The thermal insulation
consists of CFC-free polyurethane foam.
The maximum electrical power of the water heater is
550 W. The actual power consumption of the heating
element depends on the connected photovoltaic
power as well as on the radiation strength provided by
the sun. The water is heated to a maximum of 65°C to
ensure scalding protection. Detailed information can
be found in the data sheet or on the nameplate.
The water heaters are equipped with a combined check
and pressure relief valve (Table 1, No. 5) to prevent
overpressure during appliance operation. The water
tanks are made of steel with a high-strength enamel
coating and additional cathode protection provided by
a magnesium anode.
ASSEMBLY
The water heater must be installed vertically, in a frost-
free and dry room, close to the withdrawal point. The
unit is designed for fixed wall mounting only. Make sure
that the wall has sufficient load-bearing capacity. When
selecting a suitable installation location for the water
heater, the following must be considered:
• Wall type and material,
• dimensions of the unit,
• mounting type,
• arrangement of the fastening elements for wall
mounting,
• arrangement of the pipes and the
• degree of protection against water leakage.
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