Basic Documentation

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Siemens Modular Heating Controller RMH760B CE1P3133en
Building Technologies 8 Main controller and primary controller 2017-09-29
8.5.2 Heat request 2-position
Main menu > Commissioning > Settings > … or
Main menu > Settings > Main controller > Heat request
Main menu > Settings > Primary controller > Heat request
Operating line
Range
Factory setting
[2-pos] setpoint DHW
5…140 °C
70 °C
[2-pos] priority DHW None [DHW request] /
Shifting [DHW request] /
Absolute [DHW request] /
None [max selection] /
Shifting [max selection]
Shifting [DHW
request]
[2-pos] setpoint frost prot
5…140 °C
70 °C
Main menu > Commissioning > Settings > … or
Main menu > Settings > Main controller > Demand control
Main menu > Settings > Primary controller > Demand control
Operating line
Range
Factory setting
[Curvepoint 1] outside temp
–50…50 °C
–10 °C
[Curvepoint 1] flow temp
0…140 °C
70 °C
[Curvepoint 2] outside temp
–50…50 °C
20 °C
[Curvepoint 2] flow temp
0…140 °C
70 °C
3 types of digital inputs are available. They are distinguished by different handling of
the heat demand signals and by offering different setting choices.
• A signal received at input "Heating curve request 2-pos" is handled like a heat
demand signal from a heating circuit. The setpoint is dependent on the outside
temperature and is determined with the same heating curve as that used for demand
control. For more detailed information about demand control, refer to section 7.3
"Heat demand transformer"
• A signal received at input "DHW request 2-pos" is handled like a heat demand signal
from DHW heating. A constant setpoint can be preselected. In addition, priority of the
resulting DHW request can be set.
For more detailed information about DHW priority, refer to section 10.10 " DHW
priority"
• A signal received at input "Frost prot request 2-pos" is handled like a heat request
due to risk of frost. A constant setpoint can be preselected
Depending on the plant’s operating state, a heating curve request in the summer can
be ignored, for example, while consideration is given to a request for frost protection.
Whether the input shall be active when the contact is open or closed can be
parameterized for each individual input.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Inputs > RMH760.X… (or RMZ78…)
Operating line
Range
Factory setting
Normal position
Open / Closed
Open
Normal position "Open" means that the input is active when the contact is closed.
Settings
Digital inputs