Electrical Connections - Hamworthy Purewell VariHeat 65he Installation, Comissioning And Servicing Instructions

Open Vented Systems
Boilers must not be capable of isolation from the vent pipe. Valves between boiler and vent pipe to be three way
type such that when boiler is isolated from vent pipe it is open to atmosphere. Safety valves should either be
mounted on the boiler by using the connection provided, or it should not be possible to isolate a safety valve
common to more than one boiler from each boiler. BS6644 provides details.
Sealed Systems
A boiler must not be capable of isolation from the individual or common safety valve. Valves between boiler and
common safety valve to be three way type such that when boiler is isolated from safety valve it is open to
atmosphere. The boiler is provided with a connection on the boiler for the safety valve .
Where using Hamworthy Heating Ltd pipework kits, assembly of these is detailed in the Instruction manual
supplied with kit.

5.3 Electrical Connections:

The following electrical connections are provided on each module on a rail at the base of the front of the boiler.
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Supply: Live, Neutral and Earth. See Section 4.6 for details.
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Live and Neutral connections for Shunt pump or Primary Pump
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Boiler Overheat Fault Alarm Signal Output
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Common Fault Alarm Signal Output
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Boiler Normal Run Signal Output
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Remote On/Off
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0-10v Analogue Control Signal Input
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External sensors
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Cascade Management of Multiple Boiler Installations
HAMWORTHY HEATING LTD
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PUREWELL VariHeat he 500001170/K