Rotex Controller Series, Product Documentation, Page: 143 / 192

EbV Product documentation THETA NORM/UNIT
8-59
8.16 External switching modem
NOTE: This function is available if a variable input (VI1...VI3) was defined as the switching
modem in the
HYDRAULIC menu.
Function: In this configuration, an external modem can be used in order to switch different
operation modes (by telephone) remotely.
Assignment A switching modem can be assigned to every one of the three variable inputs
(VI1...VI3).
If a variable input is defined as an external modem, the corresponding parameter for
the assignment of 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: Multi-controller function for data bus systems with several standard units!
Contact function: Depending on the value of the input the following modes for the controller are
possible:
• Variable input open:
Control according to current operating mode (AUTO, RED. HEATING, HEATING,
STANDBY)
• Variable input shorted:
Controller in STANDBY mode, heating and DHW frostprotected.
• Variable input with resistance of 2.2 kOhm
Control according to continuous heating
• Variable input with resistance of 3.0 kOhm
Control according to continuous reduced heating(in RED or ECO mode according
to settings)
Switching the operating mode affects all heating circuits simultaneously. Only one
modem can be connected to a controller.
CAUTION Only close contact or resistor against GND!
Operation:
Note on operation Key / parameter tree Parameter
Activation modem function
HYDRAULIC PARAMETER 08
or
PARAMETER 09
or
PARAMETER 10
Assignment to heating circuits
SYSTEM PARAMETER 06
or
PARAMETER 07
or
PARAMETER 08