User Manual

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Heating/cooling changeover 03.10.2011
M
x
Q
23
A
y1 y2
Y
y3
Q
N.Q2
Q
N.Q3
Q
N.Q1
N.Y1
Y
DO
AO

S1 S1 S1
S2 S2
x
S2
S3
Q
Y
d

T
N.X1
SIGNAL Y
TA
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
3150S08en
with:
X1: Outside sensor
Y1: Valve
Q1: Changeover valve relay
Q2: Heat demand relay
Q3: Refrigeration demand relay
Heating ON 16 °C, cooling ON 24 °C, attenuation 24 h, locking time 4 h (locking of
relays Q2 and Q3 after changeover).
27.7.3 Precontroller for 2-pipe system heating / cooling
H/C changeover occurs by (e.g.) calendar.
Precontrol, routing of H/C demand signals (demand relay, continuous demand or
demand signal KNX) as well as changeover valve control are carried out via the
RMU7..B. The plant controls to the heat and refrigeration demand signals from the
connected consumer controllers. The H/C changeover signal is routed to these
consumer controllers.
Basic type C
Typical settings
H/C principle
Application
Diagram and
configuration