Heat Demand And Heat Requisition - Siemens Synco700 RMK770 Documentation Handbook

Sensor supervision in
general
Error messages
Building Technologies
HVAC Products
The other sensors which also belong to function block "Boiler sequence manager", such
as the return sensor for the common maintained boiler return temperature, or the return
sensor for the consumers, are monitored for short-circuit and open-circuit.
Number Text
332 [Boiler seq] MBRT sensor
error
333 Consumer return sensor
error
6.5

Heat demand and heat requisition

MAX
Function block "Boiler sequence manager" collects the heat demand from all consum-
ers (heating circuit, DHW heating and primary controller), the external inputs and the
manual setpoint preselection. These setpoints are used to generate the maximum
value.
Main menu > Boiler sequence manager > Boiler sequence optg mode
or
Operating line
Setp preselection manual
If there is no heat requisition, sustained mode can become active, if parameterized.
On the controller, 1 analog and a maximum of 3 digital inputs can be configured as heat
demand inputs.
Main menu > Commissioning > Extra configuration > Boiler sequence manager > Inputs
Operating line
Heat requis modulating
Heat requisition 2-position
DHW requisition 2-pos
Frost prot requisition 2-pos
The three 2-position heat requisitions differ in the type of heat requisition.
Depending on the selection of the boiler sequence operating mode (... > Main menu >
Boiler sequence manager > Boiler sequence optg mode > Preselection) either all 3 types are
evaluated or only individual ones.
Boiler sequence optg mode
Off
Release DHW
Auto
Boiler Sequence Controller RMK770
6 Boiler sequence management
Effect
Nonurgent message, must be acknowl-
edged, no plant stop
Nonurgent message, must be acknowl-
edged, no plant stop
Heat requisition heating circuits
Heat requisition DHW heating
Heat requisition precontrol
(heating, ventilation, individual room control)
Setpoint preselection manual
Heat requisition continuous (DC 0...10 V)
Heat requisition 2-position
Heat requisition DHW
Heat requisition frost
Setpoint sustained mode
Range
---- / 8...140 °C
Adjustable values / remarks
Only the frost input is considered
Generation of maximum value from the DHW and frost
inputs
Generation of maximum value from all 3 inputs
Factory setting
---- °C
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CE1P3132en
01.03.2005