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Q1 - main power supply switch; S1, S2 - switches I and II stage
SA1 – low pressure limit switch; HL1 - signal light – “POWER”;
SA2 - room thermostat;
HL2 - signal light – “ALARM”;
SA3 - emergency thermostat;
HL3 - signal light – “START”;
SA4 - operating thermostat;
P – circulating pump;
Figure 6.2.
Principal electrical scheme of the control board of the hot water
electric boiler of series „ELTHERM M” and „ELTHERM MM”;
NOTE : at any service and maintenance operations on the boilers components, it
is required to power off the boiler and to disconnect the mains power supply.
