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Plumbing powerpoint

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  1. 1. Heating Components The following slide shows all the components of a fully pumped central heating and hot water system using two zone valves Click on any component to find out further information Click where you see this sign for additional commentary To return to the system slide click anywhere on the screen
  2. 2. Radiator Cylinder
  3. 3. Radiators Most manufacturers recommend that radiators are fitted beneath a window. Curtains should finish 100mm above the radiator Despite the name ‘radiator’, about 85 per cent of the heat is given off by convection. The heat output of a standard panel radiator can be further improved by the addition of fins welded onto the back.
  4. 4. •Dual diaphragm temperature sensing element ROOM THERMOSTAT •Suitable for surface or switch box mounting •Heat anticipator for close temperature control •10 to 30°C setpoint range •Change-over contact switching (cooling loads) •Double insulated The thermostat should be fitted 1.5 metres from the floor
  5. 5. Combination boilers Boilers This type of boiler is designed to heat up a cold-water supply instantaneously for domestic hot water SEDBUK rating – a measure of the seasonal efficiency of a boiler installed in the UK System boilers supply domestic hot water indirectly. The key controls are all built-in to the boiler Condensing boilers are unit, including the expansion approximately 94% efficient vessel, the pump, and the bypass.
  6. 6. •Large backlit display Timers and Programmers •Factory set clock and date •Extra hour facility •Fits on standard back plate •Up to 3 on/off times per day Heating and hot water programmes can be independently controlled to allow the system to be operated efficiently.
  7. 7. Pumps should be fitted in a position Pumps that ensures that most of the system is under a positive pressure the connection point of the cold feed in the system is the point at which the pressure in the system changes from positive to negative. This is called the neutral point.
  8. 8. Cylinders Cylinders are usually supplied factory insulated The amount of water stored should relate to the likely consumption and recovery rate To prevent one pipe circulation, the hot water distribution pipe should be run horizontally, by a minimum of 450mm, after leaving the cylinder.
  9. 9. Two port valve Two of these are included on a standard fully pumped system, one controlling heating and one hot water. These valves are really what brings the key circuits together to get the system to function fully. Rr Rr
  10. 10. Cylinder Thermostat With the Honeywell thermostat no earth or neutral connection is required. The thermostat should be fitted one third of the way up from the cylinder base There is a live in connection via the wiring centre from the ‘on’ switch connection for hot water to the 1 terminal in the cylinder thermostat. There is a live out connection from the C terminal which connects to the hot-water motorised valve.
  11. 11. Bypass These are mechanical devices used to make sure water can flow through the boiler to maintain a minimum water-flow rate should a system using zone valves or TRVs become closed. Once set, the valve opens automatically as the TRVs or zone valves close and the system pressure goes over the pre-set limit. Use of the bypass valve reduces system noise and increases pump life by preventing it working against a ‘dead head’.