
Data Sheet
Danfoss Icon™ Programmable
Room Thermostats, 230 V
Description
Danfoss Icon™ Programmable 088U1020 Danfoss Icon™ Programmable 088U1025
Ordering
Danfoss Icon™ is a range of flush and surface
mounted room thermostats for hydronic floor
heating applications.
Danfoss Icon™ Programmable is mains powered
and can be used as a stand-alone thermostat or in
combination with Wiring Center.
The thermostat uses a triac output and can control
up to 5 thermal actuators.
The user can choose between 7 pre-defined heating schedules. A schedule can be temporarily
overrided by using the three mode keys.
The thermostat can also operature without scheduling (constant room temperature setpoint).
The thermostat uses forecast (adaptive learning).
The thermostat uses a “touch on glass” interface
with a shine through display. The display is “OFF”
in normal operation.
Product Version Size For junction box Code no.
Features:
• Accurate PWM-control;
• Compatible with 3’rd party wall frames;
• Shine through display with mode keys;
• 7 pre-defined schedules and forecast;
• Range limitation via user menu;
• Neutral design and simple user interface;
• Frost protection setting;
• Can be used with 230V NC or NO actuators;
• Can be optimized for different heatsources via
service menu;
• Valve exercise feature;
• Can be used in systems with cooling;
• Has input for global setback;
• Can be used with floor sensor (optional);
• Very high UV-resistance.
© Danfoss | FEC | 2021.06
Danfoss Icon™ Programmable In-wall 80 × 80 mm Euro, Ø 68 mm 088U1020
Danfoss Icon™ Programmable In-wall 86 × 86 mm Square, 70 × 70 mm 088U1021
Danfoss Icon™ Programmable In-wall 88 × 88 mm Swiss type 088U1022
Danfoss Icon™ Programmable On-wall 86 × 86 mm N.A. 088U1025
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Data Sheet Danfoss Icon™ Programmable Room Thermostats, 230 V
Accessories
Technical specifications
Product Code no.
Danfoss Icon™ 230V Wiring Center, 8 channels, up to 14 outputs 088U1040
Danfoss Icon™ 230V Wiring Center, 8 channels, up to 14 outputs, CH 088U1041
Danfoss Icon™ 230V Wiring Center, 8 channels, up to 14 outputs, NP 088U1042
Danfoss Icon™ Floor Sensor 47 kΩ, 3 m, IP 67 088U1110
Typ e Electronic thermostat with touch user interface
User interface Capacitive touch and shine through display
User interface features
Display type Hybrid: red single LED’s and custom segment
Display features Switches OFF after 10 sec. with no interaction
Real time clock
Automatic daylight saving time Standard, can be turned off
Heating schedules
Temperature setting range 5 °C to 35 °C (frost protection setting = 5 °C)
Heating icon, arrow up/down, confirm key, back
key, Home, Away, Night, Settings
Yes, std. Gregorian calendar.
8 hrs. running reserve (new product) down to
1,5 hrs. running reserve in year 10 after
installation.
7 × pre-defined schedules (P0-P6)
5/2 days (weekdays and weekends)
Ambient temperature, storage −20 °C to +60 °C
Ambient temperature, used in application 0 °C to 40 °C
Controller, type Adjustable Pulse Width Modulation
Change over, cooling Yes, via 230 V input terminal
Global setback/Away Yes, via 230 V input terminal
Max. continuous load (output) < 50 mA / 10 W (= 5 pcs. Danfoss TWA actuators)
Max. inrush current (actuator) 3 A ≤ 100 ms
Power consumption 0,2 W
Power supply (excl. actuators) 220-240 V, 50/60 Hz
Sensor, room NTC 47 kΩ
Sensor, floor (optional) NTC 47 kΩ, 3 m, IP 68
Shell material
IP and Protection class IP: 21 Protection class: II
ErP class
Approval CE, RoHS, WEEE
Colour White RAL9010 / Dark Grey RAL7024
Dimensions, in-wall versions
Dimensions, on-wall version 86 × 86 × 25 mm (088U1025)
White parts: PC ASA
Grey parts: PC, 10% glass
(2%)
80 × 80 × 11 mm (088U1020)
86 × 86 × 11 mm (088U1021)
88 × 88 × 13 mm (088U1022)
2 | © Danfoss | FEC | 2021.06
AI189586480138en-000301

Data Sheet Danfoss Icon™ Programmable Room Thermostats, 230 V
Application examples
Wiring without Wiring Center, neutral wire from main installation
Danfoss A/S
6430 Nordborg
Denmark
Icon™ Programmable
LN
Load
L
IP21
T30
Max. load: 10W/50mA
TC
088N3454 v000
Min. 3G1.5 cable to thermostat
(not counting Protective earth)
M
Max. 5 actuators, type NC or NO, 230V
Max. 10 W / Max. 50 mA continuous load
Max. 3 A inrush current ≤ 100 ms
L
50-60 Hz
Danfoss A/S
6430 Nordborg
Denmark
Icon™ Programmable
LN
Load
L
IP21
T30
Max. load: 10W/50mA
TC
088N3452 v000
50-60 Hz
Wiring with Wiring Center
Danfoss A/S
6430 Nordborg
Denmark
Icon™ Programmable
LNNNTC
Min. 3G1.5 cable to thermostat
(not counting Protective Earth)
1)
Note! Wiring Centers only support NC actuators, and do not support cooling change-over or global setback .
Min. 4G1.5 cable to thermostat
(not counting Protective earth)
M
Max. 5 actuators, type NC or NO, 230V
Max. 10 W / Max. 50 mA continuous load
Max. 3 A inrush current ≤ 100 ms
L
IP21
Max. load: 10W/50mA
Load
L
T30
088N3452 v000
LN
LOAD
Wiring Center
088U1040
088 U10 41
088U1042
1)
Max. 5 actuators, type NC, 230V
Max. 10 W / Max. 50 mA continuous load
Max. 3 A inrush current ≤ 100 ms
© Danfoss | FEC | 2021.06
AI189586480138en-000301 | 3

Data Sheet Danfoss Icon™ Programmable Room Thermostats, 230 V
Application examples
How to set thermostats to cooling mode from external device
Danfoss A/S
6430 Nordborg
Denmark
Icon™ Programmable
LNNNTC
Load
L
IP21
T30
Max. load: 10W/50mA
M
088N3452 v000
S
L
50-60 Hz
How to set thermostats to Away (global standby) from external device
Danfoss A/S
6430 Nordborg
Denmark
Icon™ Programmable
LNNNTC
Load
L
IP21
T30
Max. load: 10W/50mA
M
088N3452 v000
S
L
50-60 Hz
S: Can be mechanical switch
Summer / Winter or relay ac tivated by external device.
Use the same phase which
supplies the thermostat.
The thermostat/room re mains
in cooling mode as long as
the phase is live onto the
terminal.
Note! Switch not delivered by
Danfoss.
S: Can be mechanical switch
Home / Away or relay activated by external device.
Use the same phase which
supplies the thermostat.
The thermostat/room re mains
in Away mode as long as
the phase is live onto the
terminal.
Note! Switch not delivered by
Danfoss.
4 | © Danfoss | FEC | 2021.06
How to install a floor sensor
Danfoss A/S
6430 Nordborg
Denmark
Icon™ Programmable
LNNNTC
Load
L
IP21
T30
Max. load: 10W/50mA
M
L
50-60 Hz
Note!
Use Danfoss 47 KΩ NTC sensor, code no.: 088U1110
Always route e xternal sensors in a suitable electrical pipe!
088N3452 v000
1. 2. 3. 4.
AI189586480138en-000301

Dimensions
47
71
71
80
51
51
23
11
Danfoss Icon™ Programmable 088U1020
80 80
47
23
11
Danfoss Icon™ Programmable 088U1021
47
71
71
86
88
80
86
© Danfoss | FEC | 2021.06
23
51
Danfoss Icon™ Programmable 088U1022 (incl. Feller EDIZIOdue frame and adapter)
75
13
86
25
Danfoss Icon™ Programmable 088U1025
AI189586480138en-000301 | 5
88
86