Download Heating Controller SDC District Heating Controller DHC 43

Hydraulic Components and their Functions
SDC / DHC 43
7.1.17 Heat generator forced dissipation
Function
Possible settings
When the temperature in the heat generator exceeds the set maximum temperature
limit, any excess energy is dissipated into circuits downstream. This function applies
to all controllers on the bus system.
OFF
No heat dissipation
Dissipation into DHW tank
Only for independent DHW tanks
CAUTION
Thermal mixer valve at water heater outlet obligatory because of scalding hazard.
Dissipation into heating circuits
Any excess heat is dissipated into existing heating circuits, without exceeding the set
maximum temperature. The intended room temperature may be exceeded for short
periods. If the respective circuits are equipped with room stations, the thermostat
function should be activated.
CAUTION
For floor heating a contact thermostat must be installed to control forced switch-off of
the pumps.
Dissipation into buffer tank
7.1.18 Flue gas temperature monitoring
NOTE
Only if Parameter 8 VI-1 = 13 – Flue gas sensor set in the “Hydraulics” menu.
NOTE
A flue gas sensor can only be connected to the variable sensor input VI 1. Due to the
high temperatures a PT 1000 sensor is used for this purpose. The control device
automatically evaluates the sensor data, which are different from the data supplied
by the standard sensors.
NOTE
When a sensor fault is detected with the fuel gas sensor active, and if flue gas
monitoring was set for temporary disable or permanent inhibit (safety functions),
there will be a heat generator switch-off in addition to the malfunction message.
Function
This function controls the necessary measures in case the fuel gas temperature
exceeds the allowable limit.
Only display of fuel gas temperature
No follow-up function; the actual fuel gas temperature is displayed in the Information
display.
Heat generator disable for set time when limit is exceeded
When the temperature limit is exceeded the heat generator is disabled for the set
time and a malfunction message is triggered.
Heat generator disable when limit is exceeded
When the temperature limit is exceeded the heat generator is disabled and inhibited
permanently. It can only be unlocked by a reset in the “Malfunction messages”
menu.
EN2H-0221GE51 R1105
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