Danfoss Icon2 User Manual

44 | © Copyright Danfoss Climate Solutions | 2023.01
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 supply water temperature set for both heating and cooling is controlled by the
TWA-Q thermal actuator connected to the ‘Shunt 24V DC’ output.
The PT1000 temperature sensor on the supply line measures the supply temperature.
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 modes, 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).
• The reference thermostat did not have a heating demand during the time delay
(adjustable from 0–24 hours).
• If present, dew point monitoring must be inactive.
• The room thermostat must have cooling enabled (default = enabled).
Application 11
4-pipe heating/cooling system with 6-way ball valve with fixed
heating and cooling supply temperature control, 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 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

Danfoss Icon2 Specifications

General

Brand	Danfoss
Model	Icon2
Category	Controller
Language	English