17. Choice and connection method of control and heating ele-
ments
Boilers are provided to the user with the basic boiler performance control elements compliant with
requirements for convenient heating and its safety. The regulation ensures that the required temperature
of the water exiting the boiler (80 - 90 °C) is adhered to. The control of mixing valves and pumps is
not solved. With the exception of DC75SE, which is equipped with two thermostats 70 °C (pump con
-
nection temperature during normal operation), 95 °C (pump connection temperature during emergency
state) for switching the pump in the boiler circle and with the exception of DC15E, which is equipped
with thermostat place in the panel and an outlet for the pump in the boiler circle. Connection of these
elements is illustrated in the wiring diagram. Each pump in the system must always be controlled by an
individual thermostat to avoid a temperature drop of water returning to the boiler under 65 °C. When
connecting the boiler without an accumulation tank or equalizing tank, the pump placed in the heated
building circuit must be switched on and off by an individual thermostat or electronic regulation so
that it only operates when the pump in boiler circuit operates. If two thermostats are used – each for
switching one pump – set the thermostat that switches the heated building circuit pump, to 80 °C, and
the thermostat that switches the boiler circuit pump, to 75 °C. Both pumps may only be switched by
one thermostat. We recommend to switch the pump in the boiler circle by the means of waste gas ther
-
mostat built in the boiler (during fire-up), if the boiler is connected with the accumulation tanks and
Laddomat 22 and the if the gravity water circulation which prolongs the required temperature build
up functions well in the boiler circle. When switching the pump in the boiler circle by using the waste
gas thermostat built in the boiler panel, we recommend to install safety thermostat on the 95 °C pump
(see electric wiring diagrams). Thermostat in the boiler can be alternatively replaced with an attaching
thermostat on the boiler outlet which connects the pump in the boiler circle when the temperature rises
to 95 °C (parallel connection with the waste gas thermostat).
Setting the required water temperature for the building is always achieved by means of a three-way
mixing valve. The mixing valve can be regulated manually or by electronic regulation, which contrib
-
utes to a more convenient and economical operation of the heating system. The connection of all the
elements is designed to suit specific conditions of the heating system. Electric installations related to the
additional equipping the boilers with the above mentioned elements must be carried out by an expert in
compliance with valid ČSN EN standards.
When installing the boiler, we recommend using a closed expansion tank. However, an
open tank may also be used if permitted in the standards of the specific country. The
boiler must always be installed in a way which prevents overheating (and subsequent
damage) even during a power cut. It is because the boiler has certain momentum.
There are several ways of protecting the boiler from overheating. Connecting an over-
heat prevention cooling loop with a TS 131 3/4 ZA (95 °C) or WATTS STS 20 (97 °C)
valve to the public water system. In cases of personal wells, the boiler can be addi-
tionally protected by using a back-up power supply (battery with an exchanger) for
operation back up of at least one pump. Another option is connecting the boiler to an
after-cooling tank and reversal zone valve.
When installing the boiler, position the rear section 10 mm higher in order to facilitate
circulating and air-bleeding.
For the heating system regulation we recommend regulation elements provided by the following
companies:
a) ATMOS ACD 01 - Eqvithermal controller set for solid fuel boilers
b) KOMEXTHERM, Praha tel.: +420 235 313 284
c) KTR, Uherský Brod tel.: +420 572 633 985
d) Landis & Staefa tel.: +420 261 342 382
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