Honeywell DHC, Service Manual, Page: 152 / 262

Hydraulic Components SDC / DHC
152 EN2H-0221GE51 R0812
Legend:
t setpoin
HWPC
= Actual temperature at flow sensor "hot-water pre-
control"
t setpoin
HW
= Hot-water setpoint temperature
) ( 09 HW P
= Value of parameter 09 (hot-water loading temperature
offset)
HW
SD
= 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.
7.2.7 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 Flow from closed loop
pipeline
b Draw-off points
• 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)
New parameters