User Manual

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Heating/cooling changeover 03.10.2011
27.7 Application examples
27.7.1 Ventilation with heating/cooling coil (2-pipe system)
Routing an H/C changeover signal to other consumer controllers in the same heat
and refrigeration zone.
Heat and refrigeration generation is not controlled directly with a Synco controller.
Merely the water for heating or cooling is provided.
Basic types A and P
M
N.X1
SIGNAL Y
x
Q
23
A
y1 y2
Y
y3
S1 S1 S1
S2 S2
x
S2
S3
Q
Y
d
N.Y1
Y
AI
AO


T
°C
S3 S2 S1 S4 S5
yp yp yp yp yp
a
d
x
Kältebedarf
QY
d
S4 S4 S4
S5

Controller 1
(Ventilation)
With supply air limitation
Cascade
Constant (supply air)
Cascade/const (alternating)
Seq. limit. Casc/Const
Operating mode
Mod output
ControllerSupervision
Heat demand Cooling demand
Supervision Controller
3150S07en
with:
X1: Flow temperature sensor
Y1: Valve
Heating ON 30 °C, cooling ON 19 °C
A variant e.g. is to use a digital input (DIG) rather than a flow temperature sensor.
Typical settings are:
Heating On/cooling Off = 1
Heating Off/cooling On = 0
27.7.2 Ventilation with heat/refrigeration demand relay
H/C changeover occurs by attenuated outside temperature.
Heat and refrigeration generation is not controlled directly with a Synco controller.
Heating and cooling release as well as changeover valve control are carried out via
an RMU7..B. Heat and refrigeration demand from other consumers in the same
zone is collected and sent to the heat or refrigeration demand relay. The H/C
changeover signal is routed to these consumer controllers.
Basic types A and P
H/C principle
Application
Diagram and
configuration
Typical settings
Configuration variant
H/C principle
Application
Diagram and
configuration