DEVIreg™ 850 IV

The DEVIreg™ 850 version IV is an advanced thermostat with LED display used for outdoor ground or roof applications. The sensors provide information about both moisture level and temperature, resulting in an optimal control of the heating system. The DEVIreg™ 850 IV can handle up to 2 independent areas, in any of the following combinations: • Single system for roof or ground (1 system, 1–4 sensors). Combination system: 1 ground system and 1 roof system (2 systems, 2–4 sensors total, min. 1 sensor per system). • Dual system: either 2 roof systems or 2 ground systems (2 systems, 2–4 sensors total, min. 1 sensor per system). In the dual / combination systems it is possible to prioritize between the zones, e.g. if only a limited power output is available.

DEVIflex™ 6T

Benefits

  • Single, combination or dual zones
  • Up to 4 sensors
  • Moisture and temperature sensing
  • Self diagnosing programme
  • Safety level adjustment
  • Alarm function

Specification

Operation voltage:
PSU 24 VDC
DEVIregTM 850 IV

180–250 VAC, 50–60 Hz / 24 VDC
24 VDC ±10%

Power consumption, max.:
DEVIregTM 850 IV
Roof sensor
Ground sensor

3 W
8 W (each heating element)
13 W (each heating element)

Relay resistive load, max.:
System A / B relay
Alarm relay
Inductive load each relay, max.

15 A (3450 W) @ 230 V
2 A @ 230 V
1 A @ 230 V, power factor 0,3

Sensing unit

DEVIbusTM connected moisture sensor(s)

Cable specification for terminals max.

1 x 4 mm2 or 2 x 2,5 mm2

Ball pressure test temperature

75 °C

Pollution degree

2 (domestic use)

Controller type

1 C

Storage temperature

-20 °C to +65 °C

IP class

IP 20

Protection class

Class II -

Dimensions (H/W/D):
PSU 24 VDC
DEVIregTM 850 IV

85 х 73 х 53 mm
85 x 105 x 53 mm

Mounting method

DIN rail

Weight

720 g

Versions (languages)

Latin:  GB, CZ, DE, DK, ES, EST, FI, FR, HR, HU, LT, LV, NL, NO, PL, SCG, SE, SI, SK, TR.
Cyrillic:  GB, BG, RO, RU.

Warranty scope

20 years

Compliance

Standard compliance: EN/IEC 60730-1 (general) • EN/IEC 60730-2-9 (thermostat)

Compliance

Product variants

Choose a product variant to go for product page on Danfoss Store, where you can find more details and documents

Table

You can drag the table horizontally with your cursor to access further columns.

Item no

Product name

Tyoe

Size, mm

Ambient temperature

140F1084

DEVIregTM 850 IV Cyrillic with PSU

Without sensors, Cyrillic languages

85 x 105 x 53

-10...+50 °С

140F1085

DEVIregTM 850 IV Latin with PSU

Without sensors, Latin languages

85 x 105 x 53

-10...+50 °С

140F1086

Roof sensor for DEVIregTM 850

For DEVIregTM 850, with sensor tube, cable - 15 m

15 х 24 х 216

-50...+70 °С

140F1087

Ground sensor for DEVIregTM 850, 2 pcs.

For DEVIregTM 850, with sensor tube, cable - 15 m

Ø 93 х 98

-30...+70 °С

140F1088

Ground sensor for DEVIregTM 850, 1 pc.

For DEVIregTM 850, cable - 15 m

Ø 93 х 98

-30...+70 °С

140F1089

Power Supply Unit

PSU CP-D 24/2.5 100-240VAC/
24VDC DINrail

54 x 90 x 55

-10...+70 °С

19119977

Sensor tube and cap

For Ground Sensor DEVIregTM 850

Ø 93 х 98

-30...+70 °С

Documents