Danfoss DEVIreg 850 User manual

www.DEVI.com
Installation and user manual
DEVIreg™ 850
ground and roof sensors
EN

DEVIreg™ 850 ground and roof sensors
Installation and user manual2
Table of content
1 Sensors and control zones................................................3
1.1 Sensor types and function .................................................3
1.2 Control zones..............................................................4
1.3 Assign sensors to control zones ............................................5
2 Placing and installation of sensors ........................................6
2.1 Placing ground sensors ....................................................6
2.1.1 Placing the rst ground sensor in a zone .............................6
2.1.2 Placing the following ground sensors in a zone ......................6
2.1.3 Example with ground sensors .......................................7
2.1.4 Extending the ground sensor cable ..................................7
2.2 Installing ground sensors ..................................................8
2.3 Placing roof sensors.......................................................10
2.3.1 Placing the rst roof sensor in a zone ...............................10
2.3.2 Placing the following roof sensors in a zone.........................10
2.3.3 Guiding plates .....................................................10
2.3.4 Example with roof sensors..........................................11
2.3.5 Extending the roof sensor cable ....................................11
2.4 Installing roof sensors.....................................................12
3 Technical specications .................................................13
4 Appendix А ............................................................14
4.1 Sensor cable extension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Connections..............................................................15
5 Warranty...............................................................16

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Installation and user manual 3
1 Sensors and control zones
This section guides you through a short introduction to the terms used in the manual:
• Area type
• Sensor type
• Controller
• Control Zones
Finally you will be able to assign a number of sensors to the chosen control zones.
1.1 Sensor types and function
Identify the type(s) of area prepared for the DEVI ice and snow melting system, by
looking at the g. below:
S
N
E
W
3
4
2
1
1. Walkways and parking areas
2. Steps and stairs
3. Roofs and roof edges
4. Gutters and down pipes
For ground areas like
1 and 2 you have one or
more ground sensors.
For roof areas like
3 and 4 you have one
or more roof sensors.
The ground and roof sensors both measure two things on the sensor surface:
• temperature
• moisture from ice, snow, hail or rain
These measurements are input to the DEVIreg™ 850, and it
decides how the ice and snow melting system should control
the heated areas.
Details about the setup of the controller can be found in the
DEVIreg™ 850 installation manual.

DEVIreg™ 850 ground and roof sensors
Installation and user manual4
1.2 Control zones
A DEVIreg™ 850 and up to 4 sensors are able to control an area as a single zone, but can
also control more areas as 2 separated control zones.
2 control zones consits of minimum 2 heating elements + 2-4 sensors and can be:
Combi zones = when you have both a roof and a ground area
Dual zones = e.g. if steps should have a better performance than a walkway
If the power supply is limited, both combi and dual zones gives you the possibility to
prioritize which zone to operate rst.
A DEVIreg™ 850 and up to 4 sensors give the following 5 control options:
Zone type
Single zone ground 1-4 in one zone
Maximum
4 sensors
in all
Single zone roof 1-4 in one zone
Combi zones 1-3 in one ground
zone 1-3 in one roof zone
Dual zones ground 2-4 split in two zones
Dual zones roof 2-4 split in two zones

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Installation and user manual 5
1.3 Assign sensors to control zones
There are some good reasons to have 2 or more sensors in one control zone.
• Higher degree of detection safety, which is relevant for larger, complex or busy
roof and ground areas.
• Approx. 1 hour faster ground system, as one sensor measures the ground
temperature and other sensors measure the moisture whereas a single sensor must
switch between temperature and moisture measurements.
Now decide how the ice and snow melting system should be operated and assign the
sensors to the control zones. In case of questions the system designer must be consulted.
Draw circles around
Zone type and 1-4
Sensors
Single zone ground x 1 2 3 4
Maximum
4 sensors
in all
Single zone roof x 1 2 3 4
Combi zones x 1 2 3 1 2 3
Dual zones ground x 2 3 4
Dual zones roof x 2 3 4

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Installation and user manual6
2 Placing and installation of sensors
At this point you must have identied and assigned sensors to the control zones as
prescribed in section 1.
In this section 2 you will be guided through a correct placing and installation of the sensors:
• For placing and installation of ground sensors see section 2.1.
• For placing and installation of roof sensors see section 2.2.
2.1 Placing ground sensors
Placing ground sensors in appropriate spots is very important for the performance of
the ice and snow melting system. The appropriate spot must fulll some characteristics,
where the below 2 are the most important:
The sensors must be placed minimum 1 m within the boundaries of the heated zone.
The sensors must not be covered or prevented from being exposed to snow or rain.
This includes dirt, leaves and pebbles.
2.1.1 Placing the rst ground sensor in a zone
Find one who knows the area and make him describe the area function and weather
conditions.
The rst ground sensor in a zone must now be placed where the rst snow appears. The
appropriate spot can be found by following below steps:
a) Where the heated area is in shade all day. Look e.g. for algae.
b) Where e.g. a wind shield make the snow drift
c) Where the most trac from shoes or car wheels happens
If you have a dual zone system, the rst sensor for the other zone must be placed by
following the same steps above.
2.1.2 Placing the following ground sensors in a zone
The following ground sensors in a zone must be placed where the surface dries up last.
The appropriate spot can be found by following below steps:
a) Where the heated area is in shade all day
b) Where the melting water accumulates e.g. due to hollows in the area
c) So the whole zone is covered, but min. 1 meter from other sensors
If there is doubt about the appropriate spot, prepare a second spot for later use.

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Installation and user manual 7
2.1.3 Example with ground sensors
1 2 3
1 2 3
1 2 3
In this example a lower step section (1), a
walkway platform (2) and an upper step
section (3) is heated. Depending on number of
zones and detection safety, 2-3 ground sensors
is installed.
Sensor no. 1 is the most important as this is
placed where snow is likely to appear rst due
to shade and snow drift also because the spot
is stepped on by pedestrians.
Sensor no. 2 is also important as the platform
is object to water puddles. Here the shaded
spot will dry up last. If the power supply is lim-
ited, the platform could be a low priority zone
in a dual zone system.
Sensor no. 3 is relevant if more detection
safety is required, as additional to sensor no. 1.
Can be prepared for later installation.
2.1.4 Extending the ground sensor cable
The ground sensor consists of two parts, a sensor part with a sensor cable and a sensor
tube.
A 15-meter cable is supplied with the sensor part. Approx.
0.5 m of this cable should be coiled inside the bottom of the
sensor tube, leaving 14.5 meter to be connected with the
DEVIreg™ 850 controller.
If the appropriate spot is located out of this range, a feeder
cable extension for the sensor may be needed. This sensor
cable extension must be a 4-wired cable with a diameter in accordance with the table in
Appendix A – Sensor cable extension.
Note each new colour of the 4 wire cable feeder extensions (white, white, red and
black). Dual zone sensors: Do NOT join feeder cable extensions from separate
zones.

DEVIreg™ 850 ground and roof sensors
Installation and user manual8
2.2 Installing ground sensors
At this point you must have located the appropriate spots for the ground sensors and
extended the feeder cable if necessary as prescribed in section 2.1.
The sensor part and the sensor tube may now be installed in connection with the actual
construction work and connected at a later date. The following applies for all types of
installations.
a) The base below the sensor tube must be hard, e.g. a concrete plate or similar,
in order to ensure that the sensor is not pushed into the ground if e.g. a lorry
runs over it. The tube is designed to be mounted on a plate using the two screw
holes inside the tube.
b) Place the sensor tube in between the heating cables with a minimum distance
of 1 cm.
illustration_a_b_c
min. 1 m
min. 1 m
Assembly
box Feeder cable
illustration 2
c) The sensor tube must be positioned so that it is ush with the
surrounding terrain and so that the sensor part must be placed
so that the upper brass surface is horizontal.
illustration 6.1.1.3
installation pipe
d) Lay a conduit for the sensor cable
between the sensor tube and the
DEVIreg™ 850 controller.

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Installation and user manual 9
Installation in asphalt:
The temperature around the sensor part and sensor tube must not exceed 80°C.
A wooden dummy or similar must replace the sensor while asphalt is poured
and cooled down. The conduit must be a metal tube that can withstand the high
temperatures.
Not OK! OK!
e) Ensure that the sensor tube is closed with the supplied
cap before the concrete is poured or the bricks are laid.
Make sure that air gaps are lled with cement.
f) Coil approx. 0.5 m of the sensor cable inside the tube. If
the sensor cable needs extension, see section 2.1.4.
illustration 6.1.1.3
installation pipe with sensor cable
g) Place the sensor part inside the
sensor tube until it is horizontally
ush with the edge of the sensor
tube and rests on the collar inside
the tube.
h) The sensor part may be inspected
using the two holes around the edge
of the sensor tube. The grooves on
the outside of the sensor part corre-
spond with the holes in the sensor tube.

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Installation and user manual10
2.3 Placing roof sensors
Placing roof sensors in appropriate spots is very important to the performance of the Ice
& Snow melting system. The appropriate spot must full some requirements, where the
below 2 are the most important:
The sensors must be placed minimum 1 m within the boundaries of the heated
zone. The sensors must not be covered and prevented from being exposed to
snow or rain. This includes dirt and especially leaves in the gutters.
2.3.1 Placing the rst roof sensor in a zone
Find one who knows the area and make him describe the area function and weather
conditions. The rst roof sensor in a zone must now be placed where ice and snow
cause most problems.
The appropriate spot can be found by following below steps:
a) Where the heated area is in shade or oriented to the north/west
b) In the main gutter close to the main down pipe
If you have a dual zone system, the rst sensor for the other zone must be placed by
following the same steps above.
2.3.2 Placing the following roof sensors in a zone
The following roof sensors in a zone must be placed where the surface dries up latest.
The appropriate spot can be found by following below steps:
c) Where the snow slides e.g. due to roof joints or gutter valleys
d) In other gutters, close to other down pipes
e) So the whole zone is covered, but min. 1 meter from other sensors
If there is doubt about the appropriate spot, prepare a second spot for later use.
2.3.3 Guiding plates
guiding
plate
If a roof area is oriented to the south and the roof slope is
steep it can be exposed to strong sun radiation.
In that case it can be necessary to install guiding plates
above the sensor, so the slowly dripping melting water
from the roof hit the roof sensor.
If there is doubt about the appropriate spot, prepare a
second spot for later use.

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Installation and user manual 11
2.3.4 Example with roof sensors
In this example a roof with several dormers is heated. Depending on the number of
zones and required safety it is relevant to install 2-3 roof sensors.
1
2 3
1 2
3
1
2
3
1 2
3
Sensor no. 1 is placed in shady side of the
front. It is the most important as all melting
water passes the sensor until the gutter is dry.
As snow is likely to slide down here, the spot
is one of the last to dry up.
Sensor no. 2 is also important as the shaded
dormer roof is more at, which might cause
sudden snow slides on a dry roof. The dor-
mers could be the lower prioritized zone in a
dual zone system.
Sensor no. 3 is relevant if a higher detection safety is required. It could both be placed
near another down pipe or in the gutter valley. Thus it can be an additional sensor to both
no. 1 and 2 and can be prepared for later installation.
2.3.5 Extending the roof sensor cable
The roof sensor is a sensor part with a sensor cable built
in one.
A 15-meter cable is supplied with the roof sensor to be
connected with the DEVIreg™ 850 controller.
If the appropriate spot is located out of this range, a
feeder cable extension for the sensor may be needed. This sensor cable extension must
be a 4-wired cable with a diameter in accordance with the table in Appendix A – Sensor
cable extension.
Note each new colour of the 4 wire cable feeder extensions (white, white, red and
black). Dual zone sensors: Do NOT join feeder cable extensions from separate
zones

DEVIreg™ 850 ground and roof sensors
Installation and user manual12
2.4 Installing roof sensors
At this point you must have selected the appropriate spots for the roof sensors and
extended the feeder cable if necessary as prescribed in section 2.3.
The roof sensor may now be installed in connection with the actual construction work
and connected at a later date. The following applies for all types of installations.
min. 1 cm
a) The sensor must be placed between or next to the heating
cables, with a distance of minimum 1 cm between sensor
and heating cable.
b) The sensor must be placed so that the upper brass surface
is horizontal. If the sensor is placed on an angled roof, the
sensor must be levelled until the surface is horizontal.
c) Fasten the sensor by using the attachments on the sensor
or glue it to the surface.

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Installation and user manual 13
3 Technical specications
Technical data
Type number:
• Ground
• Roof
D850 G1 Sensor
D850 R1 Sensor
Voltage: 24VDC +10%/-20% (18-26VDC)
Power consumption:
• Ground
• Roof
Max. 13W
Max. 8W
IP class: IP 67
Ambient temperature:
• Ground
• Roof
-30˚C to +70˚C
-50˚C to +70˚C
Sensor type: Devibus connected moisture sensor(s)
Sensor lead: 15 m of 4x1 mm (may be extended in accordance
with the table in appendix A)
Indication: 2 x 16-character illuminated display.
Measurements
• Ground sensor
• Sensor tube (ground)
• Roof sensor
Depth = 87 mm; Heigth = 74 mm
Depth = 93 mm; Height = 98 mm
Depth = 15 mm; Height = 23,5 mm; Width 216 mm

DEVIreg™ 850 ground and roof sensors
Installation and user manual14
4 Appendix А
4.1 Sensor cable extension
Ground system
Number of sensors: 1 or 2 3 4
Cable type
1 mm
1.5 mm
2.5 mm
4 mm
Max length (m)
300
450
750
1200
Max. length (m)
150
225
380
600
Max length (m)
80
120
200
310
Roof system
Number of sensors: 1 2 3 4
Cable type
1 mm
1.5 mm
2.5 mm
4 mm
Max length (m)
400
600
1000
1600
Max length (m)
100
150
250
400
Max length (m)
130
200
330
525
Max length (m)
75
110
190
300

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Installation and user manual 15
4.2 Connections
Dual zone sensors: Do not join sensor cable extensions from separate zones.
1
2
3
4
5
6
7
8
II
III
Zone A
sensor I
sensor II
Zone B
sensor III
Red
Black
White
White
Red
Black
White
White
“Red”
“Black”
“White”
“White”
Note each new colour of the 4
wire cable sensor extensions
(white, white, red and black).
Sensor cable extension
according to above table
is led to DEVIreg™ 850.

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Installation and user manual16
5 Warranty
A 2-year product warranty is valid for:
• DEVIreg™ 850 ground and roof sensors.
Should you, against all expectations, experience a
problem with your DEVI product, you will nd that
Danfoss oers DEVIwarranty valid from the date of
purchase on the following conditions: During the
warranty period Danfoss shall oer a new compa-
rable product or repair the product if the product
is found to be faulty by reason of defective design,
materials or workmanship. The repair or replacement.
The decision to either repair or replace will be solely
at the discretion of Danfoss. Danfoss shall not be
liable for any consequential or incidental damages
including, but not limited to, damages to property or
extra utility expenses. No extension of the warranty
period following repairs undertaken is granted.
The warranty shall be valid only if the WARRANTY
CERTIFICATE is completed correctly and in accord-
ance with the instructions, the fault is submitted to
the installer or the seller without undue delay and
proof of purchase is provided. Please note that the
WARRANTY CERTIFICATE must be lled in, stamped
and signed by the authorized installer performing
the installation (Installation date must be indicated).
After the installation is performed, store and keep the
WARRANTY CERTIFICATE and purchase documents
(invoice, receipt or similar) during the whole warranty
period.
DEVIwarranty shall not cover any damage caused by
incorrect conditions of use, incorrect installation or if
installation has been carried out by non-authorized
electricians. All work will be invoiced in full if Danfoss
is required to inspect or repair faults that have arisen
as a result of any of the above. The DEVIwarranty shall
not extend to products which have not been paid
in full. Danfoss will, at all times, provide a rapid and
eective response to all complaints and inquiries
from our customers.
The warranty explicitly excludes all claims exceeding
the above conditions.
For full warranty text visit www.devi.com.
devi.danfoss.com/en/warranty/
WARRANTY CERTIFICATE
The DEVIwarranty is granted to:
Address Stamp
Purchase date
Serial number of the product
Product Art. No.
*Connected output [W]
Installation Date
& Signature
Connection Date
& Signature
*Not mandatory

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Installation and user manual 17

DEVIreg™ 850 ground and roof sensors
Installation and user manual18

DEVIreg™ 850 ground and roof sensors
Installation and user manual 19

DEVIreg™ 850 ground and roof sensors
08095360 & AQ000086456385en-010202 Produced by Danfoss © 06/2023
Danfoss A/S
Nordborgvej 81
6430 Nordborg, Syddanmark
Denmark