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Service Manual Danfoss Icon2™
Application 14
4-pipe heating/cooling system with 6-way ball valve with
demand-controlled heating supply temperature and fixed
cooling supply temperature, changeover to cooling based
on external (manual) potential-free NO contact
Application description
The RELAY activates when the system is in heating mode and is used to control the
230V 6-way ball valve. The 230V pump control PWR1 is active in both heating and
cooling mode.
The water temperature for heating and cooling is controlled by the TWA-Q thermal
actuator connected to output 'Shunt 24V DC' . The optimum supply temperature in
heating mode is calculated based on the heating demand for the home. The PT1000
sensor on the supply line measures the temperature of the water. If there is no
demand for heat or cooling in one or more rooms, the actuator will remain closed.
The AB-QM can also be used to set the desired maximum volumetric flow rate.
To prevent damage to the floor's construction and finish, add a dew point sensor.
A relay or potential-free contact is connected to input IN2 to control the changeover
between heating and cooling modes. When the external contact is closed, the system
will change over to cooling mode.
56 | © Copyright Danfoss Climate Solutions | 2023.01
Disabling cooling (Bathroom)
If there is a bathroom with underfloor heating and an Icon2™ room thermostat, you
may want to disable cooling for this room. Cooling a bathroom will cause condensation
to form on the floor.
There are two ways to disable cooling mode for a room:
1. Using the Installer App on a smartphone
2. Using the installer menu on the thermostat itself
To do so, set the ME.7 setting to OFF
AB432956914381en-010101
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