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Building Technologies
Boiler Sequence Controller RMK770
CE1P3132en
HVAC Products
6 Boiler sequence management
23.04.2009
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Minimum limitation of the
return temperature with
separate mixing valve per
boiler
Minimum limitation of the return temperature
with common mixing valve
Main menu > Commissioning > Settings > …
or
Main menu > Settings >
Boiler sequence manager > Limitations
Operating line
Range
Factory setting
MBRT Return temp minimum
---- / 8…140 °C
---- °C
Main menu > Commissioning > Settings > …
or
Main menu > Settings >
Boiler sequence manager > Return control
Operating line
Range
Factory setting
Actuator running time
1.0…600.0 s
150 s
P-band Xp
1.0…100.0 K
50 K
Integral action time Tn
0.0…600.0 s
60 s
If only a return temperature sensor without mixing valve has been configured, the
system tries to limit the return temperature by influencing the consumers. If the return
temperature is too low, load control restricts the amount of heat drawn by the consum-
ers.
For more detailed information, refer to subsection 5.6.2 “Load control”.
The type of locking signals can be selected on submenu
Limitations
.
Main menu > Commissioning > Settings > …
or
Main menu > Settings > Boiler sequence manager > Limitations
Operating line
Range
Factory setting
Lock sig maintained boil ret temp
None / Uncritical / Critical Critical
The main pump, like the boiler pump, never responds to locking signals.
Whether or not the system pump shall respond to locking signals can be selected on
function block “Primary controller”.
Main menu > Commissioning > Settings > …
or
Main menu > Settings >
Primary controller > Limitations
Operating line
Range
Factory setting
System pump locking signal
On / Off
Off
6.6.2
Maximum limitation of the flow temperature setpoint
Main menu > Commissioning > Settings > …
or
Main menu > Settings >
Boiler sequence manager > Limitations
Operating line
Range
Factory setting
Main flow setpoint max
25…140 °C
95 °C
Using this setting, the flow temperature setpoint, which is calculated by the function
block through generation of the maximum value, can be limited at a maximum.
With effect on the
consumers
