Heat Demand And Heat Request - Siemens Synco 700 Basic Documentation

Preselection (plant opera-
tion selector)
Setpoint preselection
manual
State
Cause
100/238
Building Technologies
HVAC Products
Operating line
* Frost protection functions ensured
** Only with main controller
The primary controller can be switched off for service purposes. The valve will close
and the pump will be deactivated, or valve and pump start their overrun.
When in the "Off" position, the heat demand signal will not be passed on!
⇒
When "Off" is preselected, the internal frost protection function will remain active and
frost protection-related heat requests (frost protection for the flow) from externally will
be accepted and handled.
When service work is completed, the selector must be set back to "Auto".
Using this setting, a minimum request for the main controller can be preselected, which
means that maximum selection with the requests from the consumers will be main-
tained.
The primary controller's state is indicated ( On / Off ).
It is indicated why the current state is active.
8.5

Heat demand and heat request

MAX
Function blocks "Main controller" and "Primary controller" collect the heat demand from
all consumers. These are:
• Heating circuits
• DHW heating
• Other primary controllers
• Heat demand signals from individual room controllers for radiators
• Heat demand signals from individual room controllers for air heating coils
• Heat demand signals from primary air handling plant
Modular Heating Controller RMH760B
8 Main controller and primary controller
Range
Frost protection for the
plant /
Overtemp protec-
tion/overrun /
Plant operation selector /
No request
Heat request heating circuits
KNX
Heat request DHW
Heat request primary controller
Heat request DC 0...10 V
Heat request heating curve
Heat request contact DHW
Heat request contact frost protection
Heat demand
transformers
Factory setting
Heat request air handling
KNX
Heat request individual
room, air heating coil
Heat request individual
room, radiator
CE1P3133en
05.02.2007