Limitation Of The Return Temperature - Siemens Synco 700 Basic Documentation

Settings
Storage tank charging
active
Overrun active
Maximum limitation of
the return temperature
Building Technologies
HVAC Products
Main menu > Commissioning > Settings > ... or
Main menu > Settings > DHW > DHW
Operating line
Discharge protection
During storage tank charging, discharging protection switches the respective charging
pump off if:
DHW plant type
DHW 1
DHW 2
DHW 3
DHW 4
DHW 5
During overrun, discharging protection switches the primary pump off if:
DHW plant type
DHW 1
DHW 2
DHW 4
DHW 5
During overrun, discharging protection switches the secondary pump off if:
DHW plant type
DHW 3
DHW 4
DHW 5
* If 2 storage tank sensors are used, the lower value will be considered
** If 2 storage tank sensors are used, the higher value will be considered

10.8.2 Limitation of the return temperature

With DHW plant types using a primary mixing valve, return temperature limitation can
be configured. This applies to plant types DHW 2, DHW 3, DHW 4 and DHW 6.
DHW 2
TFlPr
PrPu
VlvPr
TRt
FlSwi Flow switch (optional)
PrPu Primary pump
SecPu Secondary pump
TFlPr
Primary flow sensor
If the return temperature exceeds the limit value, the flow temperature setpoint of the
DHW circuit will be lowered. If the return temperature drops below the limit value, the
reduction of the flow temperature setpoint will be negated again. Limitation operates as
an I-controller whose integral action time can be adjusted.
Modular Heating Controller RMH760B
10 DHW heating
Range
Yes / No
Condition for switching off
Flow temperature < [storage tank
temperature* + 1/8 setpoint
increase of DHW charging]
Primary flow temperature < [stor-
age tank temperature** + 1/
setpoint increase of heat ex-
changer]
Condition for switching off
Flow temperature < storage tank temperature**
Condition for switching off
Flow temperature < storage tank temperature**
Flow temperature < storage tank temperature**
DHW 3, DHW 4
TFlSec
Sec
TRt
Pu
VlvPr
TFlSec Secondary flow sensor
TRt Return sensor
VlvPr
Primary mixing valve
Factory setting
Yes
Discharging pro-
tection with
Primary pump
Secondary pump
8
DHW 6
TFlSec
FlSwi
TRt
VlvPr
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CE1P3133en
05.02.2007