Heating mixer

Configure your heating with Loxone Config

Functions

The heating mixer block provides mixer control for heating or cooling. It can be used with all common types of mixers (3-way valves and analogue 0-10V mixers etc). 

For a three-way valve, the current position of the actuator is stored in the software. Once the position has reached 0% or 100%, a synchronization signal (a continuous on or off pulse which lasts 1.5-times the operation time) is sent to the actuator to ensure that it is in the correct position.

If the mixer hasn’t been in the 0% or 100% position in the last 24 hours, then a synchronization signal (a continuous on pulse lasting 1.5-times the operation time) will be sent to the actuator. The actuator is then immediately brought back to its original position.

A synchronization signal is also sent after each restart of the Miniserver.

Basic setup

The desired target temperature can be set with the analogue input temperature T. The desired temperature can either be set with a virtual input connector or a timer switch.
An actual temperature reading from a temperature sensor in the respective room should be connected to the analogue input AI.
Activating the input stop St locks the outputs in their current states.

Overview

Inputs

Description

 
T

Analogue input target flow temperature

 
AI

Analogue input current flow temperature

 
St

STOP input

Activating also activates the parameter Sm
Dis

Disables the input T

Last value for T to be entered is used and any further changes to the set temperature

Outputs

Description

 
AQ

Analogue output

0-10V mixing valve
Q1

Digital output

Three-way mixer (open)
Q2

Digital output

Three-way mixer (close)
Qe

Digital error output

(For invalid values)

Parameter 

Description

 
R

Sets the mixer running time

[s]
S

Adjusts the sampling time

[s]
Kp

Gain

Determines the % gain of the controller
Ki

Integral component

Sets the % integral component of the controller
Sm Also activated by St Sets the mixing behaviour:
0 = Unchanged
1 = Open
2 = Close
M

Sets the mixing mode

0 = Normal
1 = Inverse (for cooling function: the mixer opens with rising temperature)
Min

Minimum output value

 
Max

Maximum output value

 

More info

The sampling time S, gain Kp, and integral component Ki parameters are set by default to be suitable for most controlled systems (typically flow temperature control with a three way mixer). In difficult controlled systems (e.g. a heating circuit with a heat exchanger) it is necessary to adjust these control parameters.