Terminology

Terminology

· Air Bleed Device to let air out from a radiator or another high point

· Air separator Connects to the cold feed and expansion on open systems

· Air Vent Lets air into a cupboard or room

Bypass A link between the flow and the return to allow a continuous flow of water through the boiler

· Balanced Flue A natural draft room sealed appliance

· Boiler An appliance to heat water (heat generator)

· Combustion The burning of a fuel using air

· Changeover valve Used on combination boilers to swap between heating and

hot water

· CH System all the piping, controles & radiator configuration

· Check Valve A Non-return valve that water can only pass in one direction

· Cold feed To let cold water from the header tank into the system

· Cylinder Place for hot water storage (usually made from Copper)

· Emersion Heater An electric back up heater for water

· Expansion Pipe To let air from the system (must be one size bigger than cold feed)

· Expansion Vessel Used on sealed systems instead of an expansion tank

· Fan Flue Can be use with room sealed or open flue boilers

· Filling loop Used to fill sealed systems with water

· Flow Pipe Hot water flow from the boiler to rads or cylinder

· Flue Where the fumes from the gas goes after burning

· Heat Exchanger Where heat is transferred from the source to the destination

· Motorised valve Device to alter or stop the flow of water

· Open system A system that has an expansion tank open to atmosphere

· Open Flue An appliance that takes in air for combustion from within the room it is fitted

· Open vent An expansion pipe

· Primary Flow the flow pipe from boiler to pump before any Motorised valve

· Pump For circulating the water

· Pump over run Device to cool boiler down after call for heat has finished

· Programmer A timer that will operate more than one channel

· Return Water Returning to boiler for re-heating

· Room Sealed The boiler will take air for combustion from outside

· Sealed system Water sealed from the atmosphere (needs expansion vessel)

· Secondary Circulation an hot water circuit used with cylinders which gives instant hot water at all taps (needs a bronze pump"

· Stat Abbreviation for “Thermostat” a device for regulating temperature

· Tank A store for cold water, usually at the highest point (allow expansion of water)

· Thermostat Device for controlling temperature

· TRV Thermostatic Radiator Valve

· Unvented Cylinder Like a standard indirect cylinder but will give true mains mater pressure at all taps

· Vent pipe The same as an Expansion pipe

· Ventilation Air vent, either for cooling or supplying air for combustion

· Zone Valve Device to alter or stop the flow of water (also see Motorised valve)