Quick Hot-Water Control - Honeywell SDC heating and district heating controller Service Manual

Hydraulic Components
7.2.7
New parameters
152
Legend:
= Actual temperature at flow sensor "hot-water pre-
HWPC
setpoin t
control"
= Hot-water setpoint temperature
HW
setpoin t
= Value of parameter 09 (hot-water loading temperature
P 09 HW ( )
offset)
= Switching difference hot water
SD
HW
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.

Quick 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).
a
MK
a Flow from closed loop
pipeline
• 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)
SF
VF
b Draw-off points
EN2H-0221GE51 R0808
SDC / DHC
b
SLP