Ch Pump Control; Ch Boiler Control; Operation Algorithm; Standard - Tech Controllers EU-800 PID User Manual

6.5.1

CH PUMP CONTROL

This function enables the room regulator to influence the operation of the CH pump. When this function is active, the CH pump
will be disabled when the room regulator reports that the pre-set room temperature has been reached.
• Standard regulator – select this option if the valve will be controlled by a two-state room regulator (without RS
communication).
• TECH RS regulator – select this option if you connect a room regulator with RS communication. Such a regulator enables the
user to view current CH boiler parameters and change certain settings e.g. pre-set CH boiler temperature or pre-set DHW
temperature.
6.5.2

CH BOILER CONTROL

When the room regulator reports that the pre-set room temperature has been reached, it will decrease the pre-set CH boiler
temperature by the value of the Room reg. temp. lower parameter found in the Fitter's menu.
• Standard regulator – select this option if the valve will be controlled by a two-state room regulator (without RS
communication).
• TECH RS regulator – select this option if you connect a room regulator with RS communication. Such a regulator enables the
user to view current CH boiler parameters and change certain settings e.g. pre-set CH boiler temperature or pre-set DHW
temperature.
6.6 O
PERATION ALGORITHM
6.6.1

STANDARD

When Standard operation mode has been selected, the controller works as an ordinary two-state controller, and an additional
option will appear in the main menu - Operation settings.
A detailed description of the Operation settings parameters can be found in section 5.4.
The fan operation depends on the user's settings and the current temperature of the CH boiler. If the current temperature is
much lower than the pre-set temperature (e.g. after the fire-up phase is over), the fan operates according to user-defined
settings.
6.6.2

PID

The EU-800 PID is a controller with continuous output signal, using PID control algorithm. This type of controller calculates the
fan speed on the basis of CH boiler temperature and the flue gas temperature measured at the CH boiler outlet. The fan
operates continuously and the fan blow force depends on the CH boiler temperature, the flue gas temperature as well as the
difference between these parameters and their pre-set values. One of the greatest advantages of PID regulators is their ability to
maintain a stable pre-set temperature without unnecessary overregulation and oscillations.
Apart from PID control, the controller operation is adjusted on the basis of the the readings from the air flow sensor mounted
on the fan.
Using this type of regulator with a flue gas sensor helps to reduce fuel costs by up to several percent. Moreover, it ensures
stable temperature of output water thus prolonging the life of the heat exchanger (of the CH boiler). Flue gas temperature
control results in low emission of dust and environmentally harmful gases. Flue gas heat is not disposed of through the chimney,
but it is utilised for heating purposes.
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