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5 Selecting the control strategy
5.1 Six control strategies
The controller can be used as a weather compensator or as a room
thermostat (Room control). Six control strategies are available for
this.
1 RTC: (Modulating control) Room control
The control measures the room temperature in the reference room
(the room where the thermostat is located). The required flow
temperature based on an intelligent control system is now
calculated. The boiler works by modulating. It controls the output on
the basis of the flow temperature and return temperature of the
water. This allows it to operate as efficiently as possible. With as
constant a water temperature as possible.
Room control can be used anywhere. Unless you do not
want a single reference room to determine the temperature
for all the other rooms.
2 OTC: Control as a function of the temperature
The control measures the outside temperature with an outside
temperature sensor. The controller has a programmed heating
curve. Based on the outside temperature, the flow temperature is
determined with the help of the heating curve.
The heating curve must be chosen so that the least favourable room
can be heated efficiently, even when the outside temperatures are
very low.
The measured inside temperature does not affect the control of the
boiler. The desired inside temperature is only achieved with a
correctly programmed heating curve and a correctly designed
system.
Normal outside conditions are also important. Direct sunlight or a
strong northerly wind mean lower or higher heating requirements
respectively. This has no influence on the supply of heat. This is why
weather-compensated control alone is insufficient. and adjustments
have to be made in each room, using thermostat valves.
3 OTC + RT: Weather-compensated with the effect of the room
temperature
The basis of this control strategy is the same as weather-
compensated control. The heating curve must therefore be correctly
entered. The heating curve is also shifted when the measured room
temperature deviates from the desired room temperature. The degree
of shift is influenced by the RT effect setting. ¼ "Specific settings
for weather-compensated control", page 24
The advantage of this control is that desired changes in room
temperature can be anticipated quickly. The boiler will remain off for
longer for desired downward changes in room temperature. This is
good for the energy consumption.
iSense
5. Selecting the control strategy
030211 - 120666-AG
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