User Manual
2/5 23.03.2005 CE1G2727en Building Technologies / HVAC Products
Connection diagrams
RRV856 terminals
B1 Signal input (ext. sensor NTC) L, N AC 230V supply
M Signal ground Q7..,Q84, Q94 Digital outputs, AC24...230V, 6(4) A
D1, D2 Digital inputs Q1.., Q6... Digital outputs, AC24…230V, (0.5) A
D_GND Digital ground Y... Digital outputs, AC24...230V, 3(1) A
HB+, HB- Communication bus
RRV856 - Typical connection
Y
1
1
Y
1
2
Y
1
4
Y
2
2
Y
2
4
D
1
D
-
G
N
D
D
2
B
1
M
H
B
+
H
B
-
T
X
+
T
X
-
4
8
5
g
n
d
L
N
N
Y
3
1
Y
3
4
Q
7
1
Q
7
4
Q
8
4
Q
9
4
Q
1
1
Q
1
2
Q
1
4
Q
2
2
Q
2
4
Q
3
2
Q
3
4
Q
4
2
Q
4
4
Q
5
2
Q
5
4
Q
6
2
Q
6
4
Y
2
1
1
2
H
B
+
H
B
-
H
B
+
H
B
-
H
B
+
H
B
-
H
B
+
H
B
-
H
B
+
H
B
-
H
B
+
H
B
-
Y
2
Y
1
M
Y
2
Y
1
M
Y
2
Y
1
M
Y
2
Y
1
M
Y
2
Y
1
M
Y
2
Y
1
M
L
M
H
AC 24/230 V
Q1 Q2 Q3 Q4 Q5 Q6
Y1 Y2 D1 D2 B1 N2 N3 N3 N3 N3 N3
L
A
C 230 V
W1
Y3 F1
F2
N1
RS485
N1 RRV856 controller Y3 Auxiliary heat, emergency heat or 2
nd
N2 QAX850 master room unit stage cooling
N3 QAW850 zone room unit W1 Optional window zone off input
B1 External zone 1 temp sensor (optional) or F1 Three speed fan
pipe changeover sensor, appl. A8 F2 Single speed fan
D1 Remote activation of comfort mode RV Reversing valve
D2 Fault or emergency heat CR1 Compressor relay stage 1
Y1 Cooling output CR2 Compressor relay stage 2
Y2 Heating output Y4 Valve actuator, AC24/ 230V
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
2-pipe FCU, 2-position control (appl. 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
Optional 3-position control (appl. A1, A2 & A8)
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
Heat pumps (appl. A5)
(For single compressor heat pumps, CR2 is not connected)
Note:
Contact your local Siemens Building Technologies representatives for ap-
plication specific wiring diagrams and information.