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Thermona THERM EL 15 Manual

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control enables the boiler to operate in a low tariff rate and thus significantly reduce energy costs. Maximum boiler output
can be limited in the service menu if the operation must proceed also outside the so-called “low tariff”.
!!! Shall other ways of installing the MRC receiver be applied the output of which is one of the phases (MRC/L1
-L3), it is necessary to assure transmission to the R level (reset conductor) by means of e.g. installing an
auxiliary relay in the external distributor.
Soft start
The soft start function rests in a gradual heat-up of the heating system which is therefore protected against abrupt upward
temperature gradient. When the boiler is switched on or a new regulation period is initiated and the resulting quick change
in temperature caused by induction of heat into the system could also bring about noise due to the dilatation of pipes, the
boiler is actuated in the so-called “soft start” and limits the output after it is launched.
Auto-diagnostics, unambiguous signalling and service messages
THERM-EL electric boilers are equipped with a very useful system of auto-diagnostics chiefly with respect to service.
This function facilitates speedy and efficient removal of a potential boiler defect. Apart from the commonly displayed user
values – heating water temperature (the TOP circuit), DHW temperature, outdoor or room temperature sensor, TOP circuit
pressure – the display can show other service information if the service menu is set up correspondingly: E.g. disconnection
or short circuit of all sensors, boiler output, MRC condition and other error messages.
Wide choice of parameter settings
Service and user menus of THERM-EL boilers provide a wide range of boiler settings according to specific conditions of
operation or based on customer requirements:
- The option of setting various outputs for the heating water and heating of DHW undoubtedly offers positive financial
effects.
- The possibility of setting different outputs with the MRC signal switched on or off provides the user with a pleasant heat
comfort.
External energy input control
If there are several concurrently operating electrical apparatuses and the household has increased requirements for power
take-off, the THERM-EL boiler user will certainly appreciate the external energy input control function. A relief relay can
be connected to the distributor with a pre-set value of the electric current. If the current reaches e.g. 30 A, the boiler
disconnects a specified number of heating bars and relieves the whole system.
SLEEP standby mode
Another function the advantage of which will be namely appreciated by those users who stay outside home for longer
periods of time is the SLEEP mode. This mode is used in situations when the house will not be inhabited for an extended
period and the user wants to have the heating system reliably safeguarded against solidification or freeze-up. Boiler in the
SLEEP mode consumes minimum amount of power but the protective boiler functions – spinning, unblocking and anti-
freeze protections – are also active. If the boiler is connected to an equitherm sensor, the drop in outside temperature
activates an anti-freeze protection which can protect not only the actual boiler but the entire heating system.
If during the boiler's operation (i.e. not only in the SLEEP mode) none of the control panel buttons becomes
activated (when heating and DHW heating are switched off by the respective button), the display automatically
switches over to the saving mode (only the LED is turned on).
… 6 …


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  • I Have an EL15 and cannot see how to connect a 3 way motorised valve. Manual shows position on diagram but how is connection physically made? Please help Submitted on 28-9-2022 at 18:47

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