User manual:
RDO3x3A
20
5.1 Terminal
designation
Terminal
number
Symbols
designation
Description
A:
230VAC: Inputs and outputs
1
N
Neutral
2, 5, 12, 13
L
Phase (230VAC)
3
Bh1
Counter of operating hours burner stage 1 (230VAC)
District heating with 1 HE:
Qmin limitation
4
Bh2
Counter of operating hours burner stage 2 (230VAC)
District heating with 2 HE:
Qmin limitation 2, DHW
6
2 on/1
Burner stage 2 ON / stage 1 modulation INCREASE
District heating:
Return temp. increasing
Solar:
Collector pump ON
7
2 off/1
Burner stage 2 OFF / stage 1 modulation DECREASE
District heating with 1 HE:
Return temp. decreasing
8
HK
Boiler circuit pump
9
MK1
Mix-circuit pump 1
10
MK1
Mixing valve 1 OPEN:
Command "warmer"
Boiler return temperature control:
Increase temperature
Boiler cascade:
Shut off valve "CLOSE"
11
MK1
Mixing valve 1 CLOSE:
Command "colder"
Boiler return temperature control:
Decrease temperature
Boiler cascade:
Shut off valve "OPEN"
14
1 on
Burner stage 1 ON
15
WW
DHW charging pump
C:
230VAC: Control heating circuit 2 (RDO383A)
43, 45
L
Phase (230VAC)
44
Q3 /
MK2
Mix-circuit pump 2
42
Q2 /
MK2
Mixing valve 2 OPEN:
Command "warmer"
District heating with HE for DHW:
Increase temperature
41
Q1 /
MK2
Mixing valve 2 CLOSE:
Command "colder"
District heating with HE for DHW:
Decrease temperature
B:
Low voltage: Inputs and outputs
21
D-Bus
Device bus (remote control units, auxiliary modules and additional devices)
22 D-Bus
Pole-reversible
connection
23
PWM2
Relay module or PWM output (PWM=pulse width modulation)
24
PWM1
Relay module or PWM output
Solar: Speed control for collector pump possible via el. relay
25 GND
Common
ground
26
Ba1
Outdoor temperature sensor
FT12A
27
Br
(Ba2)
Room temp. sensor or Ba2
RFT410A (or FT12A)
28
Bk
Boiler temperature sensor
RFT203B (FT1A, ...)
District heating with 1 HE:
Sec. flow temp. sensor
29
Bv1
Flow temperature sensor 1
FT1A (FT2A)
Boiler cascade: Common flow temperature sensor
30
Brü
Return temperature sensor
FT2A (FT1A)
Solar: Collector temperature sensor
RFT303A
31
Bres
(Bv2)
Reserve temperature sensor (Bv2)
FT1A (FT2A)
District heating with 2 HE:
DHW return temp. sensor
S5
(Ext.5) Aux. input 5 (digital, potential-free)
32
Bww
DHW temperature sensor
RFT203B
33
Bag
Flue gas temperature sensor
RFT303A
Buffer storage temperature sensor 1
RFT203B (FT2A)
S3
(Ext.3) Aux. input 3 (digital, potential-free)
34
S2
(Ext.2) Aux. input 2 (digital, potential-free)
Buffer storage temperature sensor 2
RFT203B (FT2A)
35
S1
(Ext.1) Aux. input 1 (digital, potential-free)