Honeywell EN2H-0221GE51 R0808 ユーザーズマニュアル

Hydraulic Components 

SDC / DHC  

150 EN2H-0221GE51 

R0808 

The hot-water pre-control function is necessary for the controlled 
filling of hot water storage tanks with layered loading from the 
district heating network. Generally, such loading is carried out 
through a separate heat exchanger. 

The function is activated via a new setting in the "Hydraulics" 
menu, parameters 03 and 04. 

Function number: 30 

In the parameter tree for the heating circuits, parameters 14, 15, 
18, 19, 20, 21 and 22 are available. With the return flow limit 
activated, parameter 17 is displayed, too. 

 

With the FLOW display, the symbol WW for hot-water pre-mixing 
is displayed to the lower left. 

When the pump status is displayed, the string DEMAND is 
displayed instead of the control mode. 

 

When the hot-water pre-control is active, the respective mixed 
heating circuit cannot be used as a heating circuit anymore. 

When the hot-water pre-control is active, the request for hot-water 
loading is not sent directly to the energy management unit (and 
further to the district heating valve), but instead to the hot-water 
pre-control. 

The hot-water pre-control forwards the setpoint, taking into 
account the parameter-defined offset, to energy management and 
adjusts to the nominal value, which was received from hot-water 
loading, at the mixed heating circuit actuator. 

Any parameter-defined return flow limiter sensor (setting 7/8 at 
the variable input) acts according to its set function on the 
actuator of the hot-water pre-control. 

The switching behaviour of the tank loading pump is described in 
a separate demand. 

The hot-water pre-control must be activated in the same control 
device as the associated hot-water loading. 

The mixed heating circuit minimum and maximum limits are not 
adjustable and have no effect. 

The run-down time of the mixed heating circuit pump runs parallel 
with the tank loading pump extended running time.