Application 18 - Danfoss Icon2 Service Manual

Service Manual Danfoss Icon2™

Application 18

3-pipe heating/cooling system with two ball valves with
actuators, changeover to cooling based on external potential-
free NO contact
Application description
In this application, two 230V two-way motorized ball valves are used to change over
between heating and cooling modes. The ball valve for cooling will open if one or
more rooms require cooling. The ball valve for heating will open if one or more rooms
require heating.
If it is not possible to prevent the supply temperature from dropping below the dew
point in cooling mode, it is strongly recommended that you add a dew point sensor.
Condensation can result in permanent damage to the floor's construction and finish.
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.
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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
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