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Siemens OSC20
OSC20 Optimizer with ONLY a room sensor. Replacement RVL480 is a compensator / optimiser with additional functions, and the same dimensions. The existing room sensor can be re-used however a QAC22 outside sensor is required. If no control of the flow temperature is needed, the flow temperature sensor can be simulated by a fixed 1300 ohm resistor (63°C) across terminals B1 and M.
Replacement: RVL480
Please check the technical data of the replacement product exactly, a 1: 1 replacement is not always possible.
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OSC20
Optimizer
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