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8 Hydraulic diagrams
8.1 Diagram 1
Fig. 14 Diagram with 4-way control valve for central heating circuit
3
, where: 1 – boiler, 2 –
ecoMAXX regulator – module A, 3 – ecoMAXX regulator – control panel, 4 – fan, 5 – feeder temperature
sensor, 6 - gear-motor, 7 – boiler temperature sensor, 8 – HUW temperature sensor, 9 - mixer temperature
sensor, 10 – temperature (weather) sensor 12 – HUW circuit pump, 13 – mixer circuit pump, 14 – electric
servo of valve, 15 – HUW container, 16 – room thermostat or ecoSTER200, 17 – HUW circulating pump, 27
– return temperature sensor (does not affect combustion process control), P – electric relay.
As there is not mechanically forced water flow in boiler return circuit - this method of
protection of boiler return circuit from cold water is not efficient. Use of other method is
recommended. To improve water flow in gravitational circuit of the boiler (the circuit is
indicated on the diagram with a bold line) it is necessary to: (i) use pipes and 4-way
valve of large DN value, (ii) avoid using excessive number of elbows and cross section
reductions, and (iii) apply other rules of gravitational circuit construction - e.g. keeping
of gradients, etc. In case the return temperature sensor is of contact type - provide the
sensor with heat insulation to isolate it from the environment and improve its thermal
contact with the pipe by application of thermal paste. Set the preset boiler temperature
at so high value that heat output required to the heating circuit and to heat-up return
water to the boiler is guaranteed.
OPERATION mode:
Return Protection
Service Settings Boiler Settings Return
Protection 4D
Min. preset boiler temperature
Service Settings Boiler Settings
Service Settings Mixer Settings 1
Max. preset temperature of mixer 1
Service Settings Mixer Settings 1
Service Settings Mixer Settings 1
3
The presented hydraulic diagram does not replace central heating engineering design and may be used for information
purposes only.
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