Electrical Connection, 3-phase models
Basic. This is the mode that would be used for a simple connection to central heating without domestic hot water.
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With external control. Used if you should require remote switching of the boiler controls (rare).
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With tank. With the addition of a small interconnection kit, the boiler will control a 3-way valve to heat either domestic hot water or radiators as demand changes.
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In cascade. (24kW only, except last boiler in cascade) Cascade operations is when you have multiple boilers, connected in a row, or cascade. They are all controlled by the first boiler.
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Photos. 3-phase connections displayed in photo.
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