Zone Heating Control

It is normally advisable to divide the heating system intoseparate zones.
This will allow independent operation of theheating system in different parts of the house.
Typical circuitswould be the ground floor, the first floor and the domestic hotwater storage cylinder. Autonomous operation of the zones willbe achieved if individual motorised valves or pumps are fitted toeach zone.
Timer and thermostatic control will permit individualand economic functioning of the heating system in each part ofthe house.
Each zone will be switched on only at the timesrequired by the household and when there is a demand for heatindicated by the thermostat located in that area.
For all heating systems it is recommended that there be aseparate hot water circuit to allow for the heating of hot waterwithout needlessly heating the home.
This is a requirement ofall new buildings in accordance with the Building Regulationspublished in 1997. Additionally, these regulations suggestthat for homes over 100 sq. m the heating system should besplit into at least two zones in accordance with typical heatdemand differences – namely the bedrooms and living areas,the former of which typically requires lower temperatures.

A thermostatic radiator valve (TRV)

TRVmay beinstalled instead of thehand wheel valve.
The TRVcontains a bellows whichwill close the valve on a risein air temperature in theroom,
stoppingthe flow ofheating water to the heatemitter.
The TRV has anumber of settings, whichthe householder may use to set the desired air temperature foreach room.
In locations where a high level of heating isrequired,the TRV will be set at the top setting.
Conversely,if onlybackground heating is desired then the valve will be fixed at itslowest setting.