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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
3 Commissioning
05.02.2007
3.2.2
Terminal assignment and properties of outputs
In principle, all input and output terminals can be freely used. The terminals preas-
signed when selecting the plant type can also be reconfigured. In that case, however,
the special properties of the individual extension modules, and their outputs, must be
taken into consideration.
For the control of a shutoff valve, an on / off signal is usually required. For that purpose,
a number of relays with changeover contacts are available.
In the case of the RMH760B and RMZ789, these are the outputs Q1 and Q4, in the
case of the RMZ783B, outputs Q1 and Q5, in the case of the RMZ782B, output Q1,
and in the case of the RMZ787, output Q5.
The relay outputs for the on / off signal of 3-position control are assigned as pairs.
Available for selection are terminals Q1/Q2 and Q3/Q4. For that purpose, special pairs
of terminals must be used.
Normally, for 3-position control of a mixing valve or modulating burner with on / off
signal, appropriate radio interference suppression measures must be taken. If the
mixing valve does not already incorporate such an RC unit, appropriate devices must
be provided, either on the controller side or externally.
Q12
Q11
Y1
N
Y2
A
C
2
4
...
23
0
V
31
33
A
04
N1
N2
Q14
Q23
Q24
Connection of suppression units
When terminals N1 and N2 or N3 and N4 are interconnected and wired to N, the RC
unit for outputs Q1/Q2 or Q3/Q4 is activated.
RMH760B
Q1 N1 N2 Q2 Q3 Q4 Q5
31
33
Z
04
RMZ782B
Q1 N1 N2 Q2 Q3
31
33
Z
05
RMZ783B
Q1 N1 N2 Q2 Q3
31
33
Z
06
Q4 Q5
On the RMH760B basic unit and the RMZ782B and RMZ783B extension modules,
terminal pair Q1/Q2 is used for activating an RC unit.
RMZ789
Q1 N1 N2 Q2 Q3
Q4
N3 N4
31
32
Z
04
With the RMZ789 extension module, there are 4 mixing valve outputs available (for 2
mixing valves), where an RC unit can be activated.
The outputs of the RMZ787 extension module cannot be used as a 3-position output.
Outputs with change-
over contacts
Terminals for 3-position
control
Outputs with RC units
Basic connection diagram
Controller RMH760B and
extension modules
RMZ782B and RMZ783B
Universal module RMZ789
Universal module RMZ787
