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SDC / DHC Hydraulic Components
EN2H-0221GE51 R0808 153
► Set "quick hot-water control" in the "Hydraulics" menu,
parameters 03 and 04 (MC-1/MC-2), set value 39.
The tank loading pump is operated via the tank loading pump
output on the controller. The mixed heating circuit pump output
switches together with the tank loading pump.
The OPEN and CLOSED outputs of the assigned mixed heating
circuit are provided fixed to actuator operation.
The mixed heating circuit 1 flow sensor is automatically assigned
as a return sensor.
The mixed heating circuit pump runs continuously except in the
STANDBY and HOLIDAY control modes.
With quick hot-water control, parallel operation is generally
dominant.
The control valve is operated via two relay outputs. The valve
continually adjusts the hot-water setpoint temperature at the
strap-on flow sensor (no hysteresis).
The cycle time of the control unit must be less than or equal to 3
sec. Normally, a mixed valve with a runtime of 30 to 60 sec. is
used.
Attach a return sensor so that the mixing valve responds to the
varying draw-off behaviour. A conclusion is made based on the
quantity drawn off via the temperature differential, and the valve is
charged proportionally accordingly.
If the temperature spread between the tank sensor and the return
sensor is greater than the set minimum spread, you can assume
that water is being drawn off. In this case, give the valve an offset
that anticipates down times and thus prevents heavy cycling of
the mixing valve.
The value to be added is dynamic and is yielded from the
temperature differential and the set parameter value (% based on
K deviation).
Activation
Opening offset