14 | © Copyright Danfoss Climate Solutions | 2023.01
AB432956914381en-010101
Service Manual Danfoss Icon2™
Application description
Floor heating system with electronically controlled supply temperature. An optimum
supply temperature is determined based on the rooms’ need for heat.
The system uses a PT1000 sensor to detect the supply temperature. This sensor also
ensures that the temperature does not exceed the maximum allowable temperature
set as the safety temperature. If this sensor is connected, the system will control the
circulation pump and heat demand signal for a boiler or heat pump, for example.
The pump and heat demand signal will activate whenever there is a heating demand
for at least one circuit. Both the pump (PWR1) and the heat demand signal (RELAY) are
set to have a switch-on delay of 3 minutes by default.
In this application, the Danfoss Icon2™ makes use of automatic balancing. During
periods with a greater need for heat, this decreases the time spent ‘on’ for shorter
pipes in small rooms and prioritizes longer pipes in large rooms within the system. The
process is automatic and continuous. It ensures more efficient energy consumption
and greater comfort.
Application 02
2-pipe heating system with demand-controlled supply
temperature
Installer App settings
Function Factory setting
Off On
PWM+ proportional control of actuator outputs*
Heat pump optimizer – maintenance of minimum flow
PWR1 switch-on delay of 3 minutes
RELAY switch-on delay of 3 minutes
Temperature range 25.0–40.0°C
Safety temperature 50.0°C
*Non-adjustable
Required accessories
1 Mixing shunt FHM-C1 with circulation pump UPM3 15-70 088U0094
2 Stainless steel floor heating manifold SSM-F, 2–12 groups
088U0752 to
088U0762
Set of 2 mounting brackets 088U0585
Set of 2 ball valves 1" 088U0822
3 Thermal actuator TWA-A 230V NC suitable for SSM-F manifold 088H3112
4 PT1000 temperature sensor ESM-11 087B1165
5
Thermal actuator TWA-A 24V NC suitable for mixing shunt
FHM-C1
088H3110
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