25
THERM 90 KD.A
Example of gas collection
Coaxial system
(110/160)
Split system
(2 x 110)
!
3.11 Connection of the boiler to the electricity network
Boilers are fitted with a three-conductor supply cord with an unseparated fork according to ČSN 34 0350 ed.2: 2009. The
connection to the network is performed pursuant to the requirement of Article 25.1 ČSN EN 60335-1 ed.3: 2012. into the
network socket located at the boiler. The socket must fulfil the following requirements: must fulfil protection against the
hazardous contact of non-live parts in TN networks TN (formerly called zeroing) or in TT network (formerly called grounding)
and the connection must be made according to
ČSN 33 2180
so that the protective pin is on the top and the middle or zero
conductor is connected (front view) to the right hollows. The network voltage must be 230 V ± 10 %.
The installation of the socket, connection of the room thermostat and the service of the electrical part of the
boiler must only be carried out by person with the respective professional electro-technical qualification
according to the Regulation No. 50/1978 Coll..
3.11.1 Connection of the room thermostat
To control the boiler by the room thermostat, only such a thermostat that has voltage-free contact can be used, i.e. no other
voltage is supplied into the boiler.
It is necessary to connect the room thermostat to the boiler by a two-core conductor. The recommended cross-section for
connection of the room thermostat for a copper conductor (wire) is from 0,5 to 1,0 mm
2
.
The terminal board for connection of the room thermostat
is located inside the control panel of the boiler (see the electric
diagram of the connection of the boiler). It is equipped in production with an interconnecting unit. The interconnecting unit
is removed only when connecting the room thermostat! The terminal board is accessible after removing the outside cover,
tilting and consequent dismantling of the rear part of the control panel.
The output of the boiler to which the water storage tank is connected, should correspond to the nominal output
of the heating insert or heat exchange of the surface in the storage tank. In the case of over-sizing of the boiler
related to the heating insert, there is overheating of heating water in the stated circuit and consequent cycling
of the boiler. This phenomenon closely relates to the increased consumption of gas.
3.10 Connection of the boiler to the storage tank
THERM 90 KD.A boilers (after expansion by a three-way valve) can efficiently and reliably resolve heating water together with
the heating system. A detailed description of the water heating is in Chapter 2.3.6.
