Underfloor Overheat Protection; Heating Coil Preheat And Frost Protection; Frost Protectionfor Cooling; Frost Protectionfor Combinedheating And Cooling - Grundfos MIXIT Installation And Operating Instructions Manual

7.8 Underfloor overheat protection

Main menu > Settings > Application settings > Underfloor
overheat protection
This function is only available if the application setting is
set to Underfloor heating.
1. Activate the function by pressing the grey slide-button in the top
right corner of the screen.
2. Press Max. flow temperature to define a maximum forward-
flow temperature. The temperature in the system will never
exceed the given value.
The setpoint can be set to a maximum of 5 °C below the
set maximum forward-flow temperature.

7.9 Heating coil preheat and frost protection

Main menu > Settings > Application settings > Coil preheat and
frost protection
When choosing the application type Heating coil, you can activate
the coil preheat and frost protection functions.
Coil preheat
With MIXIT you can preheat the coil before allowing the fan to start.
Do as follows:
1. Activate the function by pressing the grey slide-button.
2. Press Coil preheat temperature to define a return temperature
threshold.
Frost protection
You can protect the coil from freezing by defining an air and return
flow temperature. If the temperature falls below one of the two
temperature limits, MIXIT will react by fully opening the valve in
order to circulate hot water in the system.
The return flow temperature is measured by the sensor in port B of
MIXIT. To measure the air temperature, you will need to install a
temperature sensor in the coil.
To set frost protection, do as follows:
1. Activate the function by pressing the grey slide-button.
2. Press Frost return temp. limit to define a return temperature
threshold. Press OK.
3. Press Frost air temp. limit to define an air temperature
threshold. Press OK.
4. Press Forced pump start to define a temperature threshold for
the antifreeze sensor. Press OK.
7.10 Frost protection for cooling
Main menu > Settings > Application settings > Frost protection
When choosing the application type Cooling, you can activate the
frost protection functions.
Frost protection
You can protect the coil from freezing by defining a return flow
temperature. If the temperature falls below temperature limit, MIXIT
will react by fully opening the valve in order to circulate water in the
system.
The return flow temperature is measured by the sensor in port B of
MIXIT.
To set frost protection, do as follows:
1. Activate the function by pressing the grey slide-button.
2. Press Frost return temp. limit to define a return temperature
threshold. Press OK.
7.11 Frost protection for combined heating and cooling
Main menu > Settings > Application settings > Frost protection
When choosing the application type Combined heating and cooling,
you can activate the frost protection functions.
32
Frost protection
Frost protection is available for both heating and cooling sytem
separately. You can protect the heating and cooling system from
freezing by defining a return flow temperature. If the temperature
falls below the temperature limit, MIXIT will react by fully opening
the valve in order to circulate water in the system.
The return flow temperature is measured by the sensor in port B of
MIXIT.
To set frost protection in heating and cooling application, do as
follows:
1. Activate the function by pressing the grey slide-button.
2. Press Frost return temp. limit to define a return temperature
threshold. Press OK.