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

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).