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thermostat (disjunction of the controlling circuit relay and heating bars) and thus the boiler shut-down occur
when the temperature reaches 105°C. Shall the emergency thermostat become disconnected, the boiler can be
only put back into operation by an authorized service engineer. Another protection of the boiler is assured by a
pressure switch which disengages the control circuit when the heating system water pressure decreases (when
there is not enough water in the heating system). When the system becomes replenished with water, the boiler
automatically relaunches operation. Proper deaeration of the heating system must be assured prior to launching
and also during boiler operation. The heating system bleeding is partially ensured by the automatic vent valve
which is placed at the outlet of heating water from the boiler body.
Selected important characteristics and merits of THERM- EL electric boilers:
top microprocessor control
very quiet operation (switch power relay of the heating bodies)
state-of-the-art design
ergonomic, interactive control
smooth regulation 2.5 kW regulation step (5 kW with the higher performance series)
service-adjustable pump deceleration
protection of the pump against particulate build-up
PID regulation
anti-freeze protection
DHW heating option (terminals for an external three-way valve, NTC temperature sensor or a storage tank thermostat)
optional connection of an external NTC sensor (integrated equitherm regulation)
connection of an NTC temperature room sensor (automatic controlling system as a room regulator)
integrated safety switch contactor for all output phases
possibility of an intelligent cascade boiler connection format (up to 32 boilers with smooth output modulation)
optional external control by means of GSM (external modem necessary)
optional connection of an external regulator with OpenTherm communication
balanced loading of the heating bars and bodies
power relays do not form part of the processor board printed circuits (easy servicing and replacement). Special relays with
integrated fastons were used, i.e. high currents do not flow through printed circuits.
boiler start system functioning on the basis of a mass remote control (MRC)
external control of energy input (relief relay)
soft start
integrated Grundfos UPS 15/60 pump
integrated 7 l expansion vessel (with the lower performance series)
integrated safety valve
automatic bleeding
digital heating water pressure sensor (fitted with all types)
auto-diagnostics, unequivocal service notification of defects
optional boiler parameter adjustment (rich service menu)
three-digit display (displays selected temperatures, pressure, output, error messages etc.)
further 7 LEDs for unequivocal signalling of the operational conditions
option of a default setting (immediate change of operation into the factory settings mode)
4


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