1) Building Regulations part L a) These allow independent timed control of both the hot water and the central heating b) The vent and the cold feed are installed on the flow pipe, on the suction side of the circulator with a maximum of 150mm between them. c) Conservation of fuel and power​ d) This is a flexible temporary connection between the incoming mains and the central heating system. It is used on pressurised sealed systems including combination boilers 2) BS EN 12828 a) This is a flexible temporary connection between the incoming mains and the central heating system. It is used on pressurised sealed systems including combination boilers b) provide a safety outlet if the system overheats, It allows the system to operate at atmospheric pressure,  It allows the air to escape from the system (Whilst filling and during operation)​ c) soundness test, cold flush, cleanse system (BS7593), hot flush, fill system (Inhibitor) system check d) Design of water-based heating systems​ 3) BS EN 14336 a) Installation and commissioning of water-based heating systems​ b) If a component or appliance is approved and to current standards then so too are their guidance documents; always follow manufacturers’ literature and guidance​ c) These have a special head fitted to the valve, which reacts to ambient air temperature. Within the head there is a sensor containing a volatile liquid, which expands when heated. d) They over-ride the programmer and other thermostats and should be set to between 30C– 50C.​ 4) CHeSS a) This valve controls the flow of water to both the heating and hot water circuits. b) Central Heating Efficiency System Specification c) This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. d) This allows a build up of system pressure, due to thermostatic radiator valves closing, with the circulator still working, to be released through the system pipework 5) BS EN 442 a) Manufacture of radiators​ b) When the zone valves close, the boiler switches off and when the heat is dissipated from heat exchanger the circulator will switch off.​ c) This allows a build up of system pressure, due to thermostatic radiator valves closing, with the circulator still working, to be released through the system pipework d) Conservation of fuel and power​ 6) Manufacturers’ instructions a) A three port mid position valve controls the flow of water to the hot water cylinder and heating circuit. b) This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. c) These are used on a sealed system to take up the 4% expansion of the heated water, and are sized according to the system. d) If a component or appliance is approved and to current standards then so too are their guidance documents; always follow manufacturers’ literature and guidance​ 7) The main purpose of central heating a) A three port mid position valve controls the flow of water to the hot water cylinder and heating circuit. b) soundness test, cold flush, cleanse system (BS7593), hot flush, fill system (Inhibitor) system check c) Provide thermal comfort within a property d) When the zone valves close, the boiler switches off and when the heat is dissipated from heat exchanger the circulator will switch off.​ 8) Selective central heating a) These have a special head fitted to the valve, which reacts to ambient air temperature. Within the head there is a sensor containing a volatile liquid, which expands when heated. b) These are fed from a feed and expansion cistern located at high level. These can be fully pumped or gravity systems.​ c) This allows for some rooms in a property to be heated at the same time to a specific temperature set by the customer d) Installation and commissioning of water-based heating systems​ 9) ‘Y’ plan system​ a) Prior to working on any electrical component, including the boiler, ensure that no one can accidentally turn on the system by using the safe isolation procedure.​ b) These are used on a sealed system to take up the 4% expansion of the heated water, and are sized according to the system. c) A three port mid position valve controls the flow of water to the hot water cylinder and heating circuit. d) This allows for some rooms in a property to be heated at the same time to a specific temperature set by the customer 10) ‘S’ plan system a) This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. b) The vent and the cold feed are installed on the flow pipe, on the suction side of the circulator with a maximum of 150mm between them. c) soundness test, cold flush, cleanse system (BS7593), hot flush, fill system (Inhibitor) system check d) This allows both hot water and the heating​, circuits to be controlled separately.​ 11) Low pressure, open vented systems a) These are fed from a feed and expansion cistern located at high level. These can be fully pumped or gravity systems.​ b) When the zone valves close, the boiler switches off and when the heat is dissipated from heat exchanger the circulator will switch off.​ c) This allows a build up of system pressure, due to thermostatic radiator valves closing, with the circulator still working, to be released through the system pipework d) Situated 1.5m up a wall and approximately 3m away from a heat source and not on an outside wall. 12) Sealed, pressurised systems a) Fitted at high points in the system, commonly found fitted inside boilers. They allow air to be released from the system, closing automatically.​ b) These are fed directly from the mains cold water and incorporate an expansion vessel to take up the expansion of the heated water. This type of system is a more modern fully pumped or combination boiler system.​ c) A three port mid position valve controls the flow of water to the hot water cylinder and heating circuit. d) Provide thermal comfort within a property 13) feed and expansion a) Situated 1.5m up a wall and approximately 3m away from a heat source and not on an outside wall. b) This allows a build up of system pressure, due to thermostatic radiator valves closing, with the circulator still working, to be released through the system pipework c) The vent and the cold feed are installed on the flow pipe, on the suction side of the circulator with a maximum of 150mm between them. d) fill the system and allow the heated water in the system to expand.​ 14) open vent pipe a) This is a flexible temporary connection between the incoming mains and the central heating system. It is used on pressurised sealed systems including combination boilers b) Situated 1.5m up a wall and approximately 3m away from a heat source and not on an outside wall. c) If a component or appliance is approved and to current standards then so too are their guidance documents; always follow manufacturers’ literature and guidance​ d) provide a safety outlet if the system overheats, It allows the system to operate at atmospheric pressure,  It allows the air to escape from the system (Whilst filling and during operation)​ 15) expansion vessel a) In case the sealed system over-pressurises, a PRV is installed allowing the excess pressure to be discharged safely b) Central Heating Efficiency System Specification c) These are used on a sealed system to take up the 4% expansion of the heated water, and are sized according to the system. d) Installation and commissioning of water-based heating systems​ 16) filling loop a) These have a special head fitted to the valve, which reacts to ambient air temperature. Within the head there is a sensor containing a volatile liquid, which expands when heated. b) This is a flexible temporary connection between the incoming mains and the central heating system. It is used on pressurised sealed systems including combination boilers c) They over-ride the programmer and other thermostats and should be set to between 30C– 50C.​ d) Design of water-based heating systems​ 17) pressure relief valve a) In case the sealed system over-pressurises, a PRV is installed allowing the excess pressure to be discharged safely b) This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. c) fill the system and allow the heated water in the system to expand.​ d) A three port mid position valve controls the flow of water to the hot water cylinder and heating circuit. 18) Automatic by-pass valve a) This allows a build up of system pressure, due to thermostatic radiator valves closing, with the circulator still working, to be released through the system pipework b) This allows both hot water and the heating​, circuits to be controlled separately.​ c) Prior to working on any electrical component, including the boiler, ensure that no one can accidentally turn on the system by using the safe isolation procedure.​ d) These are fed directly from the mains cold water and incorporate an expansion vessel to take up the expansion of the heated water. This type of system is a more modern fully pumped or combination boiler system.​ 19) Cylinder thermostat a) This allows both hot water and the heating​, circuits to be controlled separately.​ b) Situated 1/3rd of the way up a hot water cylinder governing the temperature of the hot water c) In case the sealed system over-pressurises, a PRV is installed allowing the excess pressure to be discharged safely d) If a component or appliance is approved and to current standards then so too are their guidance documents; always follow manufacturers’ literature and guidance​ 20) Commissioning​ a) Prior to working on any electrical component, including the boiler, ensure that no one can accidentally turn on the system by using the safe isolation procedure.​ b) Situated 1/3rd of the way up a hot water cylinder governing the temperature of the hot water c) Provide thermal comfort within a property d) soundness test, cold flush, cleanse system (BS7593), hot flush, fill system (Inhibitor) system check 21) Thermostatic radiator valves (TRV’s)​ a) When the zone valves close, the boiler switches off and when the heat is dissipated from heat exchanger the circulator will switch off.​ b) provide a safety outlet if the system overheats, It allows the system to operate at atmospheric pressure,  It allows the air to escape from the system (Whilst filling and during operation)​ c) These have a special head fitted to the valve, which reacts to ambient air temperature. Within the head there is a sensor containing a volatile liquid, which expands when heated. d) Fitted at high points in the system, commonly found fitted inside boilers. They allow air to be released from the system, closing automatically.​ 22) "H" frame a) Situated 1/3rd of the way up a hot water cylinder governing the temperature of the hot water b) If a component or appliance is approved and to current standards then so too are their guidance documents; always follow manufacturers’ literature and guidance​ c) A three port mid position valve controls the flow of water to the hot water cylinder and heating circuit. d) The vent and the cold feed are installed on the flow pipe, on the suction side of the circulator with a maximum of 150mm between them. 23) Two port motorized valve​ a) This allows both hot water and the heating​, circuits to be controlled separately.​ b) This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. c) If a component or appliance is approved and to current standards then so too are their guidance documents; always follow manufacturers’ literature and guidance​ d) These are fed directly from the mains cold water and incorporate an expansion vessel to take up the expansion of the heated water. This type of system is a more modern fully pumped or combination boiler system.​ 24) Three port mid-position valve​ a) This allows both hot water and the heating​, circuits to be controlled separately.​ b) Prior to working on any electrical component, including the boiler, ensure that no one can accidentally turn on the system by using the safe isolation procedure.​ c) This valve controls the flow of water to both the heating and hot water circuits. d) This is a flexible temporary connection between the incoming mains and the central heating system. It is used on pressurised sealed systems including combination boilers 25) Boiler interlock​ a) This valve controls the flow of water to both the heating and hot water circuits. b) When the zone valves close, the boiler switches off and when the heat is dissipated from heat exchanger the circulator will switch off.​ c) This system uses one zone valve to control the hot water, which is activated by the cylinder thermostat; and a second zone valve which is activated by the room thermostat. d) If a component or appliance is approved and to current standards then so too are their guidance documents; always follow manufacturers’ literature and guidance​ 26) Frost/pipe thermostat a) Design of water-based heating systems​ b) This allows both hot water and the heating​, circuits to be controlled separately.​ c) They over-ride the programmer and other thermostats and should be set to between 30C– 50C.​ d) provide a safety outlet if the system overheats, It allows the system to operate at atmospheric pressure,  It allows the air to escape from the system (Whilst filling and during operation)​ 27) Programmer a) soundness test, cold flush, cleanse system (BS7593), hot flush, fill system (Inhibitor) system check b) These allow independent timed control of both the hot water and the central heating c) They over-ride the programmer and other thermostats and should be set to between 30C– 50C.​ d) This valve controls the flow of water to both the heating and hot water circuits. 28) Room thermostat a) These are fed from a feed and expansion cistern located at high level. These can be fully pumped or gravity systems.​ b) Design of water-based heating systems​ c) Situated 1.5m up a wall and approximately 3m away from a heat source and not on an outside wall. d) In case the sealed system over-pressurises, a PRV is installed allowing the excess pressure to be discharged safely 29) Automatic air release valve a) These are used on a sealed system to take up the 4% expansion of the heated water, and are sized according to the system. b) Conservation of fuel and power​ c) Fitted at high points in the system, commonly found fitted inside boilers. They allow air to be released from the system, closing automatically.​ d) fill the system and allow the heated water in the system to expand.​ 30) Electrical safely​ a) Fitted at high points in the system, commonly found fitted inside boilers. They allow air to be released from the system, closing automatically.​ b) Prior to working on any electrical component, including the boiler, ensure that no one can accidentally turn on the system by using the safe isolation procedure.​ c) They over-ride the programmer and other thermostats and should be set to between 30C– 50C.​ d) A three port mid position valve controls the flow of water to the hot water cylinder and heating circuit.

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