Repair and Replacement of Central Heating Controls and Radiators
Central heating systems within a domestic property are often overlooked and taken for granted.
Understanding the components of a central heating system and how it all works will help occupants of a property, manage the maintenance requirements and seek help and advice when needed.
Central heating controls
Controls are the brain of the central heating system, with sensors and valves, the controls come together to make the system work.
A boiler will usually have a dial on it, marked in numbers or from Min to Max. This sets the temperature of the water that will be pumped from the boiler through the radiators to heat your home.
The programmer/timer controls the flow of hot water to the radiators or hot water cylinder (if fitted), and it also decides to turn the system on or off depending on the temperature in the rooms and the time of day.
Hot water circulates through a system of pipes that connect to the radiators throughout a house. At the centre of the system, a boiler burns a fuel and this heats the water that feeds the network of pipes. There are many types of radiator and they work by transferring heat to the air in the room by convections as it passes over the radiator panel. Warm air rises and pushes colder air back down and over the radiator surface again.
Individual room thermostats in your house measure the temperature of the air in the room, if it is cold it will tell the central heating to turn on, when it gets too warm it tells the central heating to turn off. Room thermostats need a free flow of air to sense the temperature, so they must not be blocked by curtains or furniture, or put near heat sources.
Thermostatic radiator valves (TRV)
These work in a similar way to the room thermostat, the TRV senses air temperature around them and turns the radiator on or off and regulates the flow of water through the radiator they are fitted to. They do not control the boiler directly