Danfoss DEVIreg 850 Manuel utilisateur

www.DEVI.com

Installation and user manual

DEVIreg™ 850

ground and roof sensors

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

DEVIreg™ 850 ground and roof sensors

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:

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

DEVIreg™ 850 ground and roof sensors

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

DEVIreg™ 850 ground and roof sensors

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.

DEVIreg™ 850 ground and roof sensors

Installation and user manual 7

2.1.3 Example with ground sensors

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

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.

DEVIreg™ 850 ground and roof sensors

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.

DEVIreg™ 850 ground and roof sensors

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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