SDC / DHC

Hydraulic Components

 

 

7.2.1On/Off operation of the district heating valve

To always ensure a minimum flow so that the heat meter can work precisely, pure on/off switching is provided in low load mode. Code 03 is suitable for this function as shown in the following diagram.

 

100%

 

 

 

x

 

 

 

0%a

 

100%y

a

Minimum travel

y

Controller output

x

Valve travel

 

 

Para-

Designation

Range

Presetti

Step

Unit

meter

 

 

ng

 

 

03

Minimum

0 ... 50

10

1

%

 

travel

 

 

 

 

 

 

 

 

 

 

Should the secondary flow temperature controller output fall below the settable minimum travel in % (code 03), two-step operation begins and the valve is closed. The valve remains closed until the internal controller output reaches 10% again. If a 10% controller output is reached, the valve opens again to the minimum travel. If the controller output drops below 10% again, the valve closes again and the cycle starts from the beginning.

This means that whenever there are demands of up to 10% on the heat generator the valve is operated in On/Off mode and the secondary flow temperature is controlled this way.

7.2.2Continuous heat exchanger valve control

If the output of the secondary flow temperature controller rises above 10%, the PI controller controls the secondary flow

EN2H-0221GE51 R0808

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Image 145
Honeywell EN2H-0221GE51 R0808 1 On/Off operation of the district heating valve, Continuous heat exchanger valve control
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EN2H-0221GE51 R0808 specifications

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