Boiler Hydraulics - Siemens Synco 700 Basic Documentation

Plant types H3-x
Pump function
Plant types H4-x
Maintained boiler return
temperature with 3-
position control
Main pump
Twin pump
Boiler pump B
Shutoff valve
Building Technologies
HVAC Products
6.2.2

Boiler hydraulics

TBo
BoPu
TRtBo
Boiler pump in the flow
For plant types with boiler (H3-x and H4-x), a boiler pump is always configured. This
boiler pump can also be operated parallel to the boiler, or it can be configured as a
boiler bypass pump.
When using the pump as a boiler bypass pump, the configuration must be made on the
"Extra configuration" menu.
TBo
TRtBo
BoPu
VlvRtMx
With plant types H4-x, the maintained boiler return temperature with 3-position mixing
valve is already configured.
Configuration of a terminal pair for a 3-position mixing valve is required. The terminals
available for selection are the free terminal pairs (Q1/Q2, Q3/Q4) for the on and the off
signal. For that purpose, the special terminal pairs with RC radio interference suppres-
sion must be used.
For more detailed information, refer to subsection 3.2.2 "Terminal assignment and
properties of outputs".
If, in addition, a main pump shall be configured, this must be done on the "Main control-
ler" block.
Optionally, a twin pump can be used in place of the boiler pump. In that case, in addi-
tion to boiler pump A, an output must also be assigned to boiler pump B via "Extra
configuration".
The single pump or twin pump can be monitored with a fault input and / or a flow
switch.
For more detailed information, refer to section 5.8 "Pump control and twin pumps".
Boiler pump B as a boiler twin pump
T
T
Modular Heating Controller RMH760B
6 Boiler temperature control
TBo
ByPu
TRtBo
Boiler pump in the bypass
MnPu
TBo
TRtBo
Y2
BoPu
MnPu
VlvRtMx Maintained return temperature mixing valve
Y2
T
TBo Boiler temperature sensor
TRtBo Return temperature sensor
(optional, for minimum limi-
tation)
BoPu Boiler pump
ByPu Bypass pump
Boiler temperature sensor
Boiler return temperature sensor
Boiler pump
Main pump
Balancing valve
T
T
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CE1P3133en
05.02.2007