SDC / DHC

Hydraulic Components

 

 

Activation ► 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.

Opening offset 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).

EN2H-0221GE51 R0808

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Honeywell EN2H-0221GE51 R0808 service manual Sdc / Dhc
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EN2H-0221GE51 R0808 specifications

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