Operation Manual

12
Regulation according to room of reference
Used in family houses. Only temperature of a selected room is monitored on the basis of which the
entire flat environment is regulated. Other rooms with diverse heat losses will be heated to different temperature
unless further thermoregulating knobs are not installed on the radiators. This method has the advantage of a
more flexible regulation. If an NTC temperature sensor located in the room of reference is connected to the
boiler automatic control system – without any other external regulator – the automatic control system can be
used as a simple room regulator (adjustable in the user menu – a Prt heating mode).
Cascade connection of boilers
The cascade connection format means connecting the boilers by means of technical elements into one
set the task of which is common heating of large spaces in a manner which complies with requirements for a
desired heat comfort. Boilers can be arranged in a cascade (see wiring diagrams) by way of a simple interface
which divides the actual electronics from the surrounding environment. Boiler electronics enable connecting up
to 32 boilers in one single intelligent cascade which will modulate the output ranging from the minimum
performance of the first boiler to the sum of maximum outputs of all boilers.
REKAS 1 interface (not included in the delivery package!) needs to be installed in both master and slave
boilers. The master boiler is in addition fitted with a master regulator (selection of the master and slave boiler is
done in the service menu).
♦ MRC – mass remote control
Mass remote control (MRC) enables transmission of electricity as well as various commands to the
users regarding tariff switching on the electrometer and operation of some appliances via standard distribution
network. Mass remote control is a set of technical means (e.g. emitters, receivers, central automatics,
transmission routes etc.) serving the emission of commands or signals for switching on or off electrical
appliances. The MRC system has replaced the switch clock used in the past. Each customer who makes use of
tariff switching must be equipped with a respective device which ensures this activity. This device is placed on
the electrometer panel and cooperates with the electric boiler. The MRC receiver is an apparatus which
performs the required switching operation (it for example blocks or unblocks an electrical appliance) as a result
of a processed MRC signal.
Depending on the service setting, the boiler can be operated either only if the cheaper tariff signal is activated
(the “HDO” LED is turned on) or if the user requires so (Ph¯ parameter, P4.4).
Heating water temperature [°C]
Outdoor temperature [°C]