Danfoss Icon2 User Manual

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AB432956914381en-010101
Service Manual Danfoss Icon2™
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.
The changeover between heating and cooling is controlled based on a reference
thermostat. The living room is set as the reference.
To prevent excessive switching between heating and cooling mode, the following
conditions must be met for the system to change over to cooling mode:
• The room temperature measured by the reference thermostat must exceed the set
room temperature + dead band (adjustable 0–4K).
• There was no heating demand for the reference thermostat during the time delay
(adjustable 0–24 hours).
• If present, dew point monitoring must be inactive.
• The room thermostat must have cooling enabled (default = enabled).
Application 12
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 reference
thermostat
Setting one thermostat as the reference thermostat
In this application, one thermostat is set up as a reference thermostat.
The temperature in this room determines whether the system is in heating or cooling
mode.
There are two ways to set up a reference thermostat:
1. Using the Installer App on a smartphone
2. Using the installer menu on the thermostat itself
To do so, set the ME.6 setting to ON
Disabling cooling (Bathroom)
If the bathroom has underfloor heating and has an Icon2™ room thermostat, you can
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

Danfoss Icon2 Specifications

General

Brand	Danfoss
Model	Icon2
Category	Controller
Language	English