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Installation
External hook−up in multi−boiler systems without LON (cont.)
Starting burner stage 1 and 2
Contact closed:
Both burner stages are switched ON.
The boiler water temperature is
limited by the electronic maximum
temperature limiter, if it is set below
that of mechanical control
thermostat"R".
Burner stage 2 is shut down 2K
sooner.
Contact opened:
Burner stages 1 and 2 are shut down.
Enable boiler, butterfly valve
Contact closed:
H Vitocrossal300:
The butterfly valve opens.
H Low temperature boiler:
Initially, the pre−heat function for
lag boilers is activated. After the
pre−heat function has expired, the
minimum boiler water temperature
will be maintained, and the burner
stages can be controlled externally.
The butterfly valve opens.
Contact opened:
The butterfly valve is closed after
approx. 5min.
Burner stages cannot be switched
ON externally; a minimum
temperature will not be maintained.
5862730GB
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