EbV Product documentation THETA NORM/UNIT
8-57
8.12 Demand contact
NOTE: This function is available if a variable input is defined as demand contact and the
corresponding output is defined as heating circuit (mixed circuit, unmixed circuit,
constant temperature control and fixed value control) in the HYDRAULIC menu.
Function: One demand contact can be assigned to every one of the three variable inputs (VI1
- VI3).
If a variable contact (see note) has been defined as a demand contact, the
corresponding parameter for allocating the contact to the respective heating circuit
(i.e. the heating circuit to be addressed by the demand contact) is displayed in the
SYSTEM menu.
The setting range has been expanded in Version 2.1 to include the domestic hot
water circuit (DHW) as well as all circuits (ALL) in one controller. Important: No
multi-controller function for data bus systems with several standard units!
• Operating modes and switching time settings are not effective when the demand
contact is active. The heating circuit only reacts to requests from the demand
contact.
• The operating modes Manual, Emission measurement with Limiter Test and
Screed function are of higher priority.
• System information: An open demand contact is signaled by the string DISABLE,
in the status display; a closed contact is identified by the string DEMAND.
Contact function: A variable input that has been defined as a demand contact acts
on the heating circuit in the following way:
• Variable input open: no demand
The heating circuit is switched off completely (no frost protection, no standby
function). Attention! The respective control circuit requires protection against frost
etc.
• Variable input shorted: Demand
The heating circuit is in operating mode HEATING (continuous heating operation)
and works according to its parameter settings.
Operation:
Note on operation Key / parameter tree Parameter
Activation demand contact HYDRAULIC PARAMETER 08
or
PARAMETER 09
or
PARAMETER 10
Assignment to heating circuits SYSTEM PARAMETER 06
or
PARAMETER 07
or
PARAMETER 08
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