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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 6 Boiler sequence management 23.04.2009
BSM *
Rel_ BS
TMnFl
TMnRt
Er2 (PMaxMon)
TrtMx
TRtCo
MnPuEr_A
MnPuEr_B
MnPuErFlow
Er3 (PMinMon)
Er1 (WLoLeDet)
MnPu_A
MnPu_B
MnVlvRtMxUP
MNVlvRtMxDN
MnVlvRtMx
DC 0…10 V
HD DC 0…10 V
HD gen.
HD DHW
HD Frost
BSS1
BSS2
BSS3
BSM
* = boiler sequence manager
Inputs: Outputs:
TMnFl Main flow sensor MnPu_A Main pump A
TMnRt Main return sensor MnPu_B Main pump B
TRtCo Consumer return sensor MnVlvRtMx MBRT 3-position /
MnPuEr_A [Main pump] overload A MBRT modulating
MnPuEr_B [Main pump B] overload Summer
MnPuErFlow Main pump flow signal
Summer operation relay
TRtMx MBRT return sensor
Er1 (WLoLeDet) Fault input 1 (water shortage switch)
Er2 (PMaxMon) Fault input 2 (maximum pressure sensor)
Er3 (PMinMon) Fault input 3 (minimum pressure sensor)
BSS1 Boiler sequence selection input 1
BSS2 Boiler sequence selection input 2
BSS3 Boiler sequence selection input 3
Release BS Release input
Summer Summer operation input
HD DC 0…10 V Heat request modulating
HD gen. Heating curve request 2-position
HD DHW DHW request 2-position
HD Frost Frost protection request 2-position
6.2 Configuration
Function block “Boiler sequence manager“ is activated by selecting a plant type in the
basic configuration. If several RMK770 controllers are used, the boiler sequence man-
ager function is always provided by the RMK770 that can acquire the main flow tem-
perature.
A plant type always requires the configuration of a main flow temperature sensor and a
main return temperature sensor. If more than 1 RMK770 is used for a boiler sequence,
these sensors may only be configured with the active “Boiler sequence manager”
function block.
For each boiler sequence, use of a main flow temperature sensor is highly recom-
mended.
Basic configuration
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