Honeywell EN2H-0221GE51 R0808 service manual Quick hot-water control, New parameters

Hydraulic Components SDC / DHC

Legend:

HWPCsetpoint = Actual temperature at flow sensor "hot-water pre- control"

HWsetpoin t = Hot-water setpoint temperature

P09 (HW ) = Value of parameter 09 (hot-water loading temperature offset)

SDHW = Switching difference hot water

Both pumps (tank loading pump and hot-water pre-control) switch off after completion of a hot-water circuit loading, taking into account their extended running times. If they are to switch off simultaneously, identical extended running times must be selected for them.

7.2.7Quick hot-water control

For monetary reasons, hot-water tanks are not used in many district heating systems, especially in Eastern Europe. The hot- water setpoint temperature is held in a closed loop pipeline here (see hydraulic example).

SF

a

MK

SLP b

		VF
a	Flow from closed loop	b Draw-off points
	pipeline
New parameters •	Minimum spread between the tank sensor and the return
	sensor from which an offset at the valve is given (see "Mixed
	Heating Circuit 1"/"Mixed Heating Circuit 2" menu, parameter
	39)
• Additional value for offset in %/K deviation (valve staring point
	for controller) (see "Mixed Heating Circuit 1"/"Mixed Heating
	Circuit 2" menu, parameter 40)
152		EN2H-0221GE51 R0808