6. TYPES OF OPERATING MODES / PROGRAM MENU
NORMAL mode of operation
Unlimited operation in NORMAL mode .
The system runs in constant heating mode. The Heating Controller adjusts the flow temperature depending
on the outdoor temperature and the selected heating curve. No temperature setback.
The display Pos. 5 shows the current flow temperature and the outside temperature at 13 (damped value).
By pressing the button (OK) the preset value of flow temperature appears for about 3 seconds at 5. At the
same time the manually selectable deviation is displayed at 13 (factory setup: 00.0 = no deviation). Using
the buttons (+) or (-) you can adjust the preset value of the flow temperature. If changed, the symbol
appears on the display.
In heating mode of operation the circulation pump is running continuously. The pump switches off if the
preset value of the flow temperature is exceeded for 30 minutes. That is the case when the room heating is
sufficient and the room thermostat closes all heating circuits by means of actuators. The same happens
when the value of flow temperature calculated by the Controller becomes lower than the actual tempera-
ture value because of rising outdoor temperatures. If the actual value of the flow temperature falls below
the preset value, the pump starts.
To ensure energy saving operating mode of the pump it could be switched by a “pump logic” of a elec-
tric connecting box. The connecting box is normally used together with room thermostats and electrother-
mic actuators. The “pump logic” is a potential free switching relay, the contact of which is closed whenever
higher temperature is demanded in any of the rooms. If all rooms are warm enough, the contact opens and
the pump turns off.
If the heat generator / boiler (WE) is in temperature setback and the temperature supplied by the WE is
below the preset temperature calculated by the Controller, heating mode is not available. However if the
circulation pump is actually running and the 2/3-way valve may also be opened by the 3-point actuator
because of room heating demand, the preset value of flow temperature may be exceeded for a short pe-
riod of time when the WE switches to heating mode. In this case, if a temperature limiter is available, the
pump might switch off and then pump operation will be possible only after the temperature drops below the
preset maximum temperature of the TB.
Trouble-shooting: The TB should be installed at a greater distance from the control unit. If necessary you
can set the TB to a higher temperature until the pump starts. After a few minutes of pump operation the
maximum allowable temperature set on the TB should be restored. Alternatively you can remove the TB
from the pipe for a while and leave the pump running for a few minutes. Then refit the TB again to the pipe.
AUTOMATIC mode of operation
Automatic mode of operation using the built-in or user programs.
The heating system is controlled according to the selected built-in or user program ( 6.2.).
If the system is in heating mode, the flow temperature is controlled depending on the outdoor temperature
and the heating curve.
For the operation of the circulation pump please refer to the section of NORMAL mode of operation.
REDUCED TEMPERATURE mode of operation
Unlimited operation in REDUCED TEMPERATURE mode .
This is a constant mode of operation of the system. The heating Controller adjusts the flow temperature
continuously on the basis of outdoor temperature and the selected heating curve and deducting the value
of temperature setback (factory setting -10.0 К).
The display indicates the current flow temperature at 5 and the outside temperature at 13. By pressing the
button (OK) the preset value for the supply flow temperature reduced by the setback in temperature is
displayed at 5 for 3 seconds. Simultaneously the reducing difference appears in 13 (without deviation =
-10.0). It can be changed by the buttons (+) or (-).
For the operation of the circulation pump please refer to the section of NORMAL mode of operation.
