User Manual
2/4 23.03.2005 CE1G2726en Building Technologies / HVAC Products
Connection diagrams
RRV852 - Terminals
B1 Signal input (ext. sensor NTC) D_GND Digital ground Q1.., Q2.. Digital outputs, AC24..230V, 2(0.5) A
M Signal ground HB+, HB- Communication bus Q7..,Q84, Q94 Digital outputs, AC24..230V, 6(4) A
D1,D2 Digital inputs L, N AC 230V supply Y... Digital outputs, AC24..230V, 3(1) A
RRV852 - Typical connection for a Duo-zone system
B
1
M
D
1
D
_
G
N
D
D1
D
2
D2
H
B
+
H
B
-
H
B
+
H
B
-
H
B
+
H
B
-
D
1
M
L
N
Q
7
4
Q
8
4
Q
9
4
Q
7
1
1
2
3
F1
1
Y
1
1
Y
1
2
Y
1
4
Y
2
1
Y
2
2
Y
2
4
Y
3
4
Y
3
1
Y1
N1 N2 N3
AC 230V
L
N
T
X
+
T
X
-
RS485
AC 24 /
230V
Y
2
Y
1
M
Q2
Y
2
Y
1
M
Q1
Q
1
2
Q
1
4
Q
2
2
Q
2
4
Q
1
1
Y2
B1
F2
Y3
4
8
5
g
n
d
`
N1 RRV852 controller D2 Faults or emergency heat Q1,Q2 Damper actuator, AC24/230V
N2 QAX850 master room unit Y1 Cooling output RV Reversing valve
N3 QAW850 night zone room unit Y2 Heating output CR1 Compressor relay stage 1
B1 External temperature sensor (optional) or Y3 Auxiliary heat, emergency heat or 2
nd
stage cooling CR2 Compressor relay stage 2
pipe changeover sensor, appl. A8 F1 Three speed fan Y4 Valve actuator, AC24/ 230V
D1 Remote activation of day zone F2 Single speed fan
Output connection for 2-p control, appl. A8 Output connection for optional 3-p control, appl. A1, A2 & A8
Y
1
1
Y
1
2
Y
1
4
Y
1
Y
2
Y4
Y
2
1
Y
2
2
Y
2
4
AC 24
/230V
N1
Y
1
1
Y
1
2
Y
1
4
Y
1
Y
2
Y4
Y
2
1
Y
2
2
Y
2
4
AC 24
/230V
N1
Output connection for heat pumps, appl. A5
(for single compressor heat pumps, CR2 is not connected)
Y
1
1
Y
1
2
Y
1
4
Y
2
1
Y
2
2
Y
2
4
N1
Y
3
4
Y
3
1
CR2
CR1
RV
AC 24
/230V
Note!
Contact your local Siemens Building Technologies representatives fo
r
application specific wiring diagrams and information
*When RRV852 is configured to duo-
switch, only QAX850 is connected.
Outputs Q1 and Q2 can be used for
general switching function
*RS485 connections are only suitable
for downloading manufacturer specific
param
e
ter sets