Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual page 127

Ca3 series gas condensing boiler with cylinder burners
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Function Description
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Cascade Control Unit
(continued)
Conventional boiler strategy 1 (coding "3c:1" in the "Cascade" group)
Starting
Shutdown
Conventional boiler strategy 2 (coding "3c:2" in the "Cascade" group)
Starting
Shutdown
127

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