ELECTRICAL SUPPLY AND CONNECTION2.11
The electrical installation and connection must be in accordance with the latest and current
I.E.E. and Local Authority regulations.
Connect the boiler to the electrical supply (230 V 50 Hz - 100 W max.) ascertaining that
polarity is correct (PH = phase into terminal L - N = neutral into terminal N) and earthed
properly.
The external controls should be connected between terminals marked 8 and 9, after having
removed the test link between them.
When the boiler runs with the two steps mode the connection of a climatic controller can be
made connecting the switch of the 1st step to terminals 48-49 and the switch of the 2nd step
to terminals 50-51.
The overrun relay fitted avoids boiler nuisance trip of the limit safety thermostat when the cir-
culating pump is stopped with a hot boiler block.
The overrun relay should be adjusted at a temperature of approx. 85°C, in any case 5°C over
the regulating temperature of the boiler thermostat. In this way the external controls can also
stop the circulating pump. The circulating pump runs in two situations:
- when requested by the external controls
- when boiler temperature is higher than temperature adjusted on overrun relay.
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