Heat Request 2-Position; Heat Demand Transformers - Siemens Synco 700 Series Basic Documentation

Digital inputs
142/232
Building Technologies
HVAC Products
9.5.2

Heat request 2-position

Main menu > Commissioning > Settings > ... or
Main menu > Settings > Primary controller > Demand control
Operating line
[Curvepoint 1] outside temp
[Curvepoint 1] flow temp
[Curvepoint 2] outside temp
[Curvepoint 2] flow temp
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Primary controller > Heat request
Operating line
[2-pos] setpoint DHW
[2-pos] priority DHW
[2-pos] setpoint frost protection
A total of 3 types of digital input are available. They are distinguished in the way they
handle heat demand signals and in the different setting choices they offer.
• A signal received at input "Heating curve request 2-pos" is handled like a heat de-
mand signal from one of the heating circuits. The setpoint is dependent on the out-
side temperature and determined via the same heating curve as demand control. For
more detailed information about demand control, refer to section 8.3 "Heat demand
transformers".
• A signal received at input "DHW request 2-pos" is handled like a signal from DHW
heating. A constant setpoint can be preset. Also, the priority of the resulting DHW
request can be selected. For more detailed information about DHW priority, refer to
section 5.6.2 "Load control".
• A signal received at input "Frost prot request 2-pos" is handled like a heat request
resulting from risk of frost. A constant setpoint can be preset
A heating curve request can be ignored in the summer while consideration is given to
frost protection requests depending on the plant's state.
Whether the input shall be active with the contact open or closed can be parameterized
for each input.
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Inputs > RMK770... (or RMZ78...)
Operating line
Normal position
Normal position "Open" means that the input is active when the contact is closed.
9.5.3

Heat demand transformers

For a description of the heat demand transformers, refer to section 8.3 "Heat demand
transformers".
Boiler Sequence Controller RMK770
9 Precontrol
Range
–50...50 °C
0...140 °C
–50...50 °C
0...140 °C
Range
0...140 °C
None [DHW request] /
Shifting [DHW request] /
Absolute [DHW request] /
None [max selection] /
Shifting [max selection]
0...140 °C
Range
Open / Closed
Factory setting
–10 °C
70 °C
20 °C
70 °C
Factory setting
70 °C
Shifting [DHW
request]
70 °C
Factory setting
Open
CE1P3132en
23.04.2009