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size to have more than 1 heating zone). Room thermostats
need a free flow of air to sense the temperature, so they must
not be covered by curtains or blocked by furniture. Nearby
electric fires, televisions, wall or table lamps may prevent the
thermostat from working properly. Also keep out of direct
sunlight.
N.B.
This thermostat has the option of standard setting
or TPI.
What is Chronoproportional Control (TPI)?
A chronoproportional (or TPI) room thermostat makes boilers
operate more efficiently and provide close accurate control.
Chronoproportional control is a load compensator as it
ensures that the boiler ‘ON’ time is reduced to a minimum
and matches the boiler heat output with the heat loss. This
reduces the net temperature of the return water to the
boiler. This is due to the TPI (Time Proportional and Integral)
advanced energy saving feature.
Rather than just a simple ON/OFF control, like other domestic
room thermostats, room thermostats with TPI increases
boiler efficiency by firing the boiler at regular intervals,
adjusting firing duration with demand, to maintain set
room temperatures, giving them a great advantage over
other domestic room thermostats and achieving a constant
ambient environment for the user e.g. if a property only has
a simple mechanical thermostat installed, then the energy
saving benefits of a replacement high efficiency condensing
boiler will not be realised as the boiler will rarely be running in
condensing mode.
Heating and hot water can account for over 80% of
total household energy usage. Chronoproportional (TPI)
