11
System Control and Economy Measures
Important
It is very important that since the boiler stores heat to avoid using peak rate power, all pipes in the vicinity
of the boiler and outside the heated areas in the house (i.e. under the floors and in the attic), should be
insulated with good quality insulation, minimum thickness of 25mm to prevent standing heat loss.
Failure to insulate
can lead to very high electricity bills
.
In addition care must be taken to avoid gravity feeding, hot water travelling upwards and heating radiators
upstairs with the pump off. This draws heat from the boiler when it is not required.
System Control
It is important for reasons of economy that there is proper control over the heating system. For this reason
it is recommended that the Danfoss TP5000, or similar programmer is used. This programmer is battery
operated and as such does not require a power supply, which means it will retain the set program in the
event of a power failure. It serves as a room thermostat and time clock combined, thus removing the need
to provide a by-pass radiator. This type of programmer also serves as a frost stat, which will bring the
heating on if the temperature in the house drops below 5deg C. Provided of course the boiler is switched
on.
It is recommended that the programmer is set up in the sitting room, in a position where it is not influenced
by heat from the radiators or sunlight. If the sitting room contains a solid fuel fire or any other form of
additional heating, then an alternative site must be considered such as the hall.
The radiators throughout the house should be fitted with thermostatic valves, except in the room where the
programmer is sited.
This would mean that the rooms would be controlled by the thermostatic valves and because they are
usually smaller, or require a lower temperature, the required heat will be achieved before the sitting room.
When the sitting room reaches temperature the pump is switched off, this removes the need for a by-pass
radiator wasting heat from a pump circulating heat round a house which has achieved temperature.
It should also be considered that the amount of water in the system is kept to a minimum by the use of low
capacity radiators. When the system is switched on all the cold water in the radiators and pipes has to be
reheated by the boiler and that has to be paid for!
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