Central Heating Room thermostats
A room or air thermostat enables master control of house temperatures to be achieved. This operates on the principle that, with a balanced whole-house heating system, if the temperature is correct in a given room, it should be correct in all the others.
A thermostat should be mounted clear of, or radiators and not in rooms of major occupation, and at about a height of l.52m above the floor for convenience. The thermostat should be in an accessible place, so that changes in setting can be made in comfort levels.
Why rooms of major occupation, such as lounges or kitchens, should be avoided as sites for an air thermostat, is because extra heat is generated by people, or by kitchen appliances, all of which raise the temperature artificially.
This means that other rooms would be cold, since the thermometer would react to the highest temperature.
Set the room thermostat for the desired optimum domestic temperature. When the chosen levels of comfort are reached, the heating will shut down, switching on again when the heat demands require topping up.
Thermostats can be either mains or low-voltage operated. The low-voltage models are claimed to be more accurate than those on mains voltage.
It is important to maintain even overall comfort levels, since the home should be regarded as a unit. It is a false economy to shut off heating in little-used rooms, since this will serve only to ‘raid’ heat from a warm to a cold zone.
The night cut-back type of control works on the basis that it is more economic to keep a reasonable level of temperature in the home throughout the heating season, rather than to shut down the circuit during any period.
This is a sound theory, for considerable energy may be needed to restore lost space and fabric temperatures.
The frost-sensing thermostat is a control which can be located outside the house. This works in conjunction with the internal room thermostat and enables fine control to be maintained over indoor temperatures. These are, however, among the more expensive of heating controls.
Control equipment is usually supplied with simplediagrams, enabling connections to be made without the need for specialised electrical knowledge.
With older, high-thermal (cast-iron) capacity boilers, a thermostatic mixing valve can be fitted. This filters back hot water into the heating pipework, bypassing the boiler and saves fuel when the heat demand is small.
10. November 2011 by admin
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