Bosch Thermotechnik FLH 25M Manual Del Usuario página 10

Electric flange heater FLH
5.5 Water connection of the cylinder
The installation, connection and operating instructions for the domestic hot water cylinder (boiler), as well as the technical regulations for drinking water in-
stallations (German: Regeln für Trinkwasser-Installationen / TRWI) according to DIN 1988, must be adhered to at all times.
Pressure-resistant connection
Using unsuitable or non-functional cylinder connection fittings will void any warranty claims. This also applies if the given operating pressure is exceeded.
Water connection must only be made via a type-tested diaphragm safety valve or a membrane safety valve combination (connection fitting for pressure-resist-
ant cylinders).
A safety valve combination consists of a shutoff, testing, return, drainage and safety valve with expansion water drainage. This component is installed between
the cold water supply and cold water inlet of the cylinder in the order shown below.
Drain valve
Functional fittings
5.6 Electrical connection
CAUTION!
Installation of the heating element and initial commissioning must only be performed by a qualified technician!
CAUTION!
The electrical connection must always be carried out according to the type-related circuit diagram (connection diagram in casing cover).
CAUTION!
Make sure that the connection voltage is correct! All metal parts of the cylinder which can be touched must be included in the protective measures.
A disconnecting switch (1 or 3-pole) with 3 mm contact clearance must be provided for in the electrical supply line. A (slow-acting) circuit breaker is also per-
missible as a disconnecting switch.
The connection cable must be fed through the included gland into the flange heater, and using a strain relief device must be secured against being pulled out
and twisted.
NOTE
For touch protection with enamelled domestic hot water cylinders, it is necessary for the heating elements to be installed only in water heaters
which have water inlets and outlets made of metal and which are connected to the protective earth conductor terminal (equipotential bonding).
Version with contactor control
VDE-tested contactors which are installed on site, for example in a control cabinet or electrical distribution system, are required for installation. Separate con-
tactors must be used for the safety temperature limiter and the thermo controller. The contactors must have a label identifying their safety function for the wa-
ter heater (flange heater). (TC and STL).
Power ratings for selecting the contactors can be seen in the table (technical data section) in the switching assembly column. The safety temperature limiter
contactor must be dimensioned for the total output of the switching assemblies. After installation is complete, the fault-free function of the contactors must be
checked.
FLH – 6721836796 05/2021 [EN]
4
452115.66.66 FD 9601
Safety valve
Return flow valve (return flow inhibitor)
Test valve
Optionally pressure reducing valve
Shutoff valve
Original Quality by Bosch Thermotechnik GmbH
Sophienstraße 30-32; D-35576 Wetzlar/Germany