Water Connection Of The Cylinder; Electrical Connection; Initial Start-Up; Inspection, Maintenance And Service - Dimplex FLH 25M Montage- Und Gebrauchsanweisung

5.5
5.5 Water connection of the
cylinder
The installation, connection and operating instructions for the hot
water cylinder (boiler), as well as the technical regulations for
drinking water installations (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.
The water connection must only be made using a type-tested
diaphragm safety valve or a diaphragm safety valve combination
- a connection fitting for pressure-resistant 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.

5.6 Electrical connection

CAUTION!
For warranty reasons, installation of the heating element and initial start-
up must only be performed by authorized and qualified personnel.
CAUTION!
The electrical connection must always be carried out according to the
type-related circuit diagram (connection diagram inside the casing
cover).
CAUTION!
Make 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 permissible as a disconnecting switch.
The connection cable must be fed through the pipe union
(included in the scope of supply) into the flange heater, and must
be secured using a strain relief device against being pulled out
and twisted.
NOTE
For touch protection with enamelled 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 conductor terminal.
E-4
Version with contactor control
Installation must be carried out by the customer using VDE-
tested contactors which are installed, for example, in a control
cabinet or a current distribution board. Separate contactors must
be used for the safety temperature limiter and the temperature
controller. The contactors must have a label identifying their
safety function for the water 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 functioning of the
contactors must be checked.

5.7 Initial start-up

CAUTION!
The cylinder must be filled with water prior to electrical start-up.
During the heating-up process, the water inside the cylinder must
flow out of the safety valve (with a pressure-resistant
connection), or else drip out of the overflow mixer tap or flow into
a connected expansion vessel (with a pressureless connection).
CAUTION!
Hot water outlet pipe and parts of the safety valve may become hot.
6 Inspection,
maintenance and
service
In the case of very hard water, limescale which has formed on
the inside of the cylinder and free-floating limescale deposits
must be removed by a qualified technician after one to two years
of operation.
Cleaning is performed through the flange opening - remove
flange heater, clean cylinder. We recommend using a new seal
when re-installing the heater.
 It is important not to damage or remove the protective
current bleed resistor during maintenance work.
NOTE
The enamelled inner tank of the DHW preparation device must not come
into contact with boiler cleansing compound. Do not use a decalcifying
pump.
Do not use abrasive cleaning agents or paint thinners (such as
nitro, trichloroethylene, etc.) for cleaning the device.
After cleaning, rinse the device thoroughly and monitor the
heating-up process.