Central Heating Programmers
A programmer is the most common main heating control. This consists of a time clock which enables, over a period of 24 hours, a choice of heating and hot water. Most programmers provide some five ‘programmes’ related to the clock setting.
These are: central heating off and hot water on twice a day; central heating and hot water twice; central heating twice with hot water all day; central heating and hot water all day; and constant central heating and hot water.
Some programmers have an over-ride switch to enable hot water to be switched in outside programme times, without having to reset the tappings on the dial. An off position enables the system to be shut down.
With gravity-feed hot-water systems, the programmer switches on the supply of fuel and ignition, allowing the hot-water circuit to operate by gravity action; with central heating, it also switches on the pump.
The arrangements are slightly more complicated on miniaturized and sealed pumped-primary circuits, since a relay box may be needed to permit the operation of motorized control valves. These open and close, in order to control the appropriate heating and hot-water circuits.
There are more sophisticated types of programmer, enabling control of independent twin-circuit systems, providing up to as many as 16 separate programmes on a multi-function separator with a motorized valve. Without a valve controlling the pumped-primary circuit, there is a choice of ten programmes, achieved by, in effect, combining two time switches operated by the same dial.
10. November 2011 by admin
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