grandis principle

Multi-functional controller types:

 Temperature difference controller 

The Temperature difference controller is the most widely used function. There is a measurement point at both the source and the sink. If the difference between the temperatures of the two measurement points exceeds a predefined value, the switching output of the multi-function controller switches on.
In addition, a minimum temperature can be set at the source and a maximum temperature at the sink. If the maximum temperature is exceeded or the temperature falls below the minimum temperature, the switching output of the multi-function controller switches off.

Activate                          Settings

Reloading

Output: R3, Source: S5, Sink: S6

External heat exchanger

Output: R3, Source: S5, Sink: S2

Pool

Output: R2, Source: S3, Sink: S4

Pool with external heat exchanger

Output: R4, Source: S5, Sink: S6

 Heating 

Simple thermostat function. The switching output of the multi-function controller switches on as soon as the temperature falls below the preset switch-on temperature. If the temperature rises above the upper limit of the preset temperature range (hysteresis), the switching output of the multi-function controller switches off..

Re-heating

Output: R2, Source: S5

 Cooling 

Simple thermostat function. The switching output of the multi-function controller switches on as soon as the preset switch-on temperature is exceeded. If the temperature drops below the lower limit of the preset temperature range (hysteresis), the switching output of the multi-function controller switches off.

Cooling

Output: R3, Source: S5

Re-load

Output: R3, Source: S5

 Threshold value switch 

As a flexible option of the functions heating and cooling. the switching output of the multi- function controller switches on as soon as the temperature reaches the preset switch-on temperature. If the temperature drops below or rises above the preset temperature range (hysteresis), the switching output of the multi-function controller switches off. To use this function for heating, set the “Hysteresis” value to greater than 0. To use this function for cooling, set the “Hysteresis” value to less than 0..

 Wood-fired boiler 

This function allows you to re-heat the storage tank from a solid fuel boiler. The switching output of the multi-function controller will be activated if the boiler temperature (source sensor) plus the selected temperature range (hysteresis) exceeds the storage tank temperature (sink sensor).
In addition you can also define a switch-on temperature (setpoint temperature). In this case the pump will not start until the switch-on temperature has been reached. With this function the storage tank will be heated to a maximum temperature of 95 °C.

Tipical re-heating

Output: R3, Source: S5, Sink: S6

 Return line boost 

To save energy, energy is supplied to the heating return flow from the solar circuit or storage tank. The mode of operation and relevant parameters are similar to those of the “Temperature difference controller” function.

Return line boost

Output: R3, Source: S3, Sink: S4

 Temperature range 

With this function you can set the upper limit and the lower limit of a temperature range. The multi-function controller will switch only within this temperature range.

 Circulation – temperature-controlled 

The switching output of the multi-function controller switches on as soon as the temperature falls below the preset setpoint temperature. If the temperature rises above the upper limit of the preset temperature range (hysteresis), the switching output switches off.

Temperature-controlled Circulation

Output: R3, Sink: S6

 Circulation – time-controlled 

The circulation pump is switched on and off in alternation within a preset time window. You can configure the setting for the duration of the respective runtime and waiting time.

Time-controlled Circulation

Output: R3

 Timer 

In the case of this function, the switching output of the multi-function controller switches on within the preset time window. 3 time windows with runtime are possible.

 Alarm 

In the case of this function, the switching output of the multi-function controller switches on or off when there is a fault on the sensors used. 3 time windows with runtime are possible.

 HW reheating 

With this function, the MFR output will be switched on when the hot water request is active. The HW reheating can thus be implemented in layers using a three-way reversing valve.

Warm water re-heating

 Solar boost (only grandis 600 SR) 

With this function, the switching output of the multi-function controller is linked either to the solar control or to the “drain-back” function. If the solar control or drain-back function is active, the MFC will be switched on, and at the end of the adjustable runtime it will be switched off again. If the solar control is switched off during this time, the MFR will also be switched off. For the MFC to react again when switched on, the solar power system must be continuously off for at least a selected off period.

Solar control

Drain Back

 Solar redundancy (only grandis 600 SR) 

If a flow fault is reported during this function, the switching output of the MFC will be switched on and it will run in parallel with the solar power system. If the flow fault is rectified within the specified runtime, the link will be cancelled and the MFC will stop. If the flow fault still exists when the runtime has ended, the MFC will be permanently linked to the solar power system. This will be indicated by a fault message. You can use “Reset” to reset the permanent link to the solar power system. This will also reset the fault message.

Solar redundancy

 Mischer 

Mit dieser Funktion können Sie eine Rücklaufanhebung mittels Mischer auf die berechnete maximale Vorlaufsolltemperatur der Heizkreise realisieren. Der Multifunktionsregler benutzt als Referenz je nach Einstellung die Heizungsvorlauftemperatur, die Warmwassersolltemperatur oder eine einstellbare Soll-Temperatur.

Rücklaufanhebung mit Referenz die aktuell höchste Vorlaufsolltemperatur. Regeltemperatur „Heizen“ und Regelmodus “Vorlauf mit Freigabetemperatur”.

Der Mischer wird abhängig vom Sensor Quelle (Sy) und Sensor Senke (Sx) geregelt. Überschreitet die Quelle die Vorlaufsolltemperatur + Hysterese, ist die Funktion aktiv und der Mischer regelt auf die Vorlaufsolltemperatur + Hysterese.

Eine einstellbare Zieltemperatur als Referenz. Regeltemperatur „Festwert“ und Regelmodus “Rücklauf mit Freigabetemperatur”.

Der Mischer wird abhängig vom Sensor Quelle auf eine feste Zieltemperatur geregelt. Unterhalb der Zieltemperatur wir der Mischer zugefahren.