The differential bypass valve is designed to prevent the pump from working against a closed circuit when all the 2 port control valves or thermostatic radiators have closed.
Please always refer to the manufacturer’s instructions for the correct application. All parts should be fitted by a qualified gas-safe certificate plumber.
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This product fits the following appliances:
• Vaillant ecoTEC exclusive 832 (2007-2010)
• Vaillant ecoTEC exclusive 838 (2007-2010)
• Vaillant VUW 326/4-E (2007-2010)
• Vaillant VUW 386/4-E (2007-2010)