Viessmann GC1 Installation And Service Instructions

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Installation
External hook−up in single boiler systems (cont.)
Starting burner stage 1
Contact closed:
Burner stage 1 is started. Burner
stage 2 will only be started for
maintaining the minimum temperature.
The boiler water temperature is
limited by the electronic maximum
temperature limiter, if it is set below
that of mechanical control
thermostat"R".
Contact opened:
Burner stage 1 is shut down.
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 2K
sooner.
Contact opened:
Burner stages 1 and 2 are switched
OFF.
External changeover of
stepped/modulating burners
Contact open: mod. operation
Contact closed: two−stage operation
Code"02:2" (modulating burner)
must be selected.
Note
Even if the contact is closed,
scanning the type of burner will
continue to display "modulating".
External start−up depending on load
Upon closing the zero volt contact,
the burner will be regulated to a
required set boiler water
temperature, subject to load. The set
boiler water temperature is adjusted
via code "9b".
The boiler water temperature is
limited via the selected maximum
boiler water temperature or the
mechanical thermostat"R".
5862730GB

Viessmann GC1 Specifications

General

Brand	Viessmann
Model	GC1
Category	Control Unit
Language	English