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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
6 Boiler temperature control
05.02.2007
6.2.2 Boiler
hydraulics
313
3S
71
BoPu
TBo
TRtBo
31
33
S
72
TBo
ByPu
TRtBo
TBo
Boiler temperature sensor
TRtBo Return temperature sensor
(optional, for minimum limi-
tation)
BoPu Boiler pump
ByPu Bypass
pump
Boiler pump in the flow
Boiler pump in the bypass
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.
313
3S
73
MnPu
TBo
TRtBo
BoPu
VlvRtMx
Y2
TBo
Boiler temperature sensor
TRtBo
Boiler return temperature sensor
BoPu
Boiler pump
MnPu
Main pump
VlvRtMx Maintained return temperature mixing valve
Y2
Balancing valve
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
31
3
2
S
66
T
T
31
3
2
S
67
T
31
3
2
S
68
T
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