Siemens Synco 700 - Limitation of the Return Temperature

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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 10 DHW heating 05.02.2007
Main menu > Commissioning > Settings > …
or
Main menu > Settings > DHW > DHW
Operating line Range Factory setting
Discharge protection Yes / No Yes
During storage tank charging, discharging protection switches the respective charging
pump off if:
DHW plant type Condition for switching off Discharging pro-
tection with
DHW 1
DHW 2
Flow temperature
< [storage tank
temperature* + 1/8 setpoint
increase of DHW charging]
Primary pump
DHW 3
DHW 4
DHW 5
Primary flow temperature
< [stor-
age tank temperature** + 1/
8
setpoint increase of heat ex-
changer]
Secondary pump
During overrun, discharging protection switches the primary pump off if:
DHW plant type Condition for switching off
DHW 1
DHW 2
DHW 4
DHW 5
Flow temperature < storage tank temperature**
During overrun, discharging protection switches the secondary pump off if:
DHW plant type Condition for switching off
DHW 3 Flow temperature < storage tank temperature**
DHW 4
DHW 5
Flow temperature < storage tank temperature**
* 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 DHW 3, DHW 4 DHW 6
TFlPr
PrPu
VlvP
r
TRt
3133S82
VlvPr
TFlSec
Sec
Pu
TRt
3133S83
VlvPr
FlSwi
TFlSec
TRt
3133S84
FlSwi Flow switch (optional) TFlSec Secondary flow sensor
PrPu Primary pump TRt Return sensor
SecPu
Secondary pump
VlvPr
Primary mixing valve
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.
Settings
Storage tank charging
active
Overrun active
Maximum limitation of
the return temperature