HAMWORTHY HEATING LTD. PUREWELL PERMANENT IGNITION 500001090/B20Figure No. 8 – Typical Boiler InstallationsExpansion pipevalveSafetyDrainFeedpipevalveFeed &expansiontank(alternative(valveDrainpositionCirculation pumpPgaugesPressure &TemperatureTValveMains waterFloat AutomaticAir VentHamworthy Modular Boilers1 2 3Circulation pumpHeating loadValve'Marshall HE’ Water FlowTemperature SensorTemperature Sensor'Marshall HE’ Outside AirTemperature Sensor'Marshall HE’ RoomCirculation pumpTemperature Sensor'Marshall HE’ Outside Air'Marshall HE’ RoomTemperature SensorTemperature Sensor'Marshall HE’ Water FlowCirculation pumpHamworthy Modular Boilers1 2 3TemperaturePressure &SafetyvalveDrainPgaugesT (alternative(positionValveHeating loadValveAir VentAutomaticvalvecheckDoublefill lineTemporaryAir VentAutomatic valveLockshieldMains waterLockshieldvalve PressurisationHamworthyUnitExpansionValve LockshieldLockshieldvalvevalveDrainvalveVENTED SYSTEM: Reverse return pipework, Hamworthy recommended system.Heating loadAir VentAutomaticValveCirculation pumpHamworthy Modular Boilers1 2 3DrainvalveSafetyTemperaturePgaugesPressure &valveDrainTemperature Sensor'Marshall HE’ Outside AirTemperature Sensor'Marshall HE’ Water FlowTemperature Sensor'Marshall HE’ RoompositionalternativeCirculation pump((ValveLockshieldvalveDrainvalvePressurisationHamworthyUnitfill lineTemporaryExpansionAir VentAutomaticValvevalvecheckDoublevalveLockshieldLockshieldvalvevalveLockshieldMains waterUNVENTED SYSTEM: Single pipe headerUNVENTED SYSTEM: Reverse return pipework, Hamworthy recommended system.TCirculation pumpTemperature SensorTemperature Sensor'Marshall HE’ Outside Air'Marshall HE’ RoomTemperature Sensor'Marshall HE’ Water FlowVENTED SYSTEM: Single pipe headerFeedpipeHamworthy Modular BoilersCirculation pump1 2 3Mains waterExpansion pipeFeed &expansiontankvalveFloatPressure &TemperatureSafetyvalveDrainPgaugesT((alternativepositionValveDrainvalveHeating loadValve Air VentAutomaticValveTT‘Marshall HE’ Boiler SequenceControl SystemControl System‘Marshall HE’ Boiler Sequence‘Marshall HE’ Boiler SequenceControl SystemControl System‘Marshall HE’ Boiler Sequence