DEVIreg 850 Sensor Ground and Roof User Manual

DEVIreg 850 Sensor Ground and Roof

Product Information

Specifications

• Maximum 4 sensors in all zones
• Ground sensors for walkways, parking areas, steps, and stairs
• Roof sensors for roofs, roof edges, gutters, and downpipes
• Measure two parameters on the sensor surface

Product Usage Instructions

• Sensors and Control Zones
  The DEVIregTM 850 system allows for assigning sensors to control zones based on the area being monitored. Ground sensors are used for ground areas like walkways and parking lots, while roof sensors are for roof areas like roofs and gutters.

• Assigning Sensors to Control Zones
  Decide how the ice and snow melting system should operate and assign the sensors to the control zones accordingly. Consult the system designer for any questions.

• Placing and Installation of Sensors

• Placing Ground Sensors
  Ensure ground sensors are placed at least 1 meter within the boundaries of the heated zone and are not covered or obstructed from snow or rain exposure.

FAQ

• Q: How many sensors can be used in a single control zone?
  A: A maximum of 4 sensors can be used in any control zone.

• Q: What types of areas are suitable for ground sensors?
  A: Ground sensors are suitable for walkways, parking areas, steps, and stairs.

• Q: How do I decide the placement of sensors for roof areas?
  A: Ensure roof sensors are placed on roofs, roof edges, gutters, and downpipes to effectively monitor snow and ice accumulation.

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 several sensors to the chosen control zones.

Sensor types and function
Identify the type(s) of area prepared for the DEVI ice and snow melting system, by looking at the fig. 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.

Control zones
A DEVIreg™ 850 and up to 4 sensors can control an area as a single zone, but can also control more areas as 2 separated control zones.

2 control zones consist of a minimum of 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 give you the possibility to prioritize which zone to operate first.

A DEVIreg™ 850 and up to 4 sensors give the following 5 control options:

Assign sensors to control zones
There are some good reasons to have 2 or more sensors in one control zone.

• A 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.

Placing and installation of sensors

At this point, you must have identified and assigned sensors to the control zones as prescribed in Section 1.

In this section 2 you will be guided through the correct placement 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.

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 fulfil some characteristics, where the below 2 are the most important:

• The sensors must be placed a minimum of 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.

Placing the first ground sensor in a zone
Find one who knows the area and make him describe the area’s function and weather conditions.

The first ground sensor in a zone must now be placed where the first snow appears. The appropriate spot can be found by the below steps:

• Where the heated area is in the shade all day. Look e.g. for algae.
• Where e.g. a windshield makes the snow drift
• Where the most traffic from shoes or car wheels happens

If you have a dual zone system, the first sensor for the other zone must be placed by following the same steps above.

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 the below steps:

• Where the heated area is in the shade all day
• Where the melting water accumulates e.g. due to hollows in the area
• 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.

For example ground sensors

• In this example a lower step section (1), a walkway platform (2) and an upper step section (3) are heated. Depending on the number of zones and detection safety, 2-3 ground sensors are installed.
• Sensor no. 1 is the most important as this is placed where snow is likely to appear first due to shade and snow drift and 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 limited, the platform could be a low-priority zone in a dual-zone system.
• Sensor no. 3 is relevant if more detection safety is required, in addition to sensor no. 1. Can be prepared for later installation.

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 meters 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 by 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.

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 to all types of installations.

• The base below the sensor tube must be hard, e.g. a concrete plate or similar, 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.

• Place the sensor tube in between the heating cables with a minimum distance of 1 cm.

• The sensor tube must be positioned so that it is flush with the surrounding terrain and the sensor part must be placed so that the upper brass surface is horizontal.

• Lay a conduit for the sensor cable between the sensor tube and the DEVIreg™ 850 controller.
  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 high temperatures.

• 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 filled with cement.

• Coil approx. 0.5 m of the sensor cable inside the tube. If the sensor cable needs an extension, see section 2.1.4.

• Place the sensor part inside the sensor tube until it is horizontally flush with the edge of the sensor tube and rests on the collar inside the tube.

• 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 correspond with the holes in the sensor tube.

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 fulfil some requirements, where the below 2 are the most important:

• The sensors must be placed a minimum of 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.

Placing the first roof sensor in a zone
Find one who knows the area and make him describe the area’s function and weather conditions. The first roof sensor in a zone must now be placed where ice and snow cause most problems.

The appropriate spot can be found by the below steps:

• Where the heated area is in shade or oriented to the north/west
• In the main gutter close to the main downpipe

If you have a dual zone system, the first sensor for the other zone must be placed by following the same steps above.

Placing the following roof sensors in a zone
The following roof sensors in a zone must be placed where the surface dries up the latest.

The appropriate spot can be found by the below steps:

• Where the snow slides e.g. due to roof joints or gutter valleys
• In other gutters, close to other down pipes
• 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.

Guiding plates

• 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 hits the roof sensor.
• If there is doubt about the appropriate spot, prepare a second spot for later use.

For 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.

• Sensor no. 1 is placed on the 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 flat, which might cause sudden snow slides on a dry roof. The dormers could be the lower prioritized zone in a dual zone system.
• Sensor no. 3 is relevant if a higher detection safety is required. They could both be placed near another downpipe 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.

Extending the roof sensor cable

• The roof sensor is a sensor part with a sensor cable built into it.
• A 15-meter cable is supplied with the roof sensor to be connected to 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 by 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

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.

The roof sensor may now be installed in connection with the actual construction work and connected at a later date. The following applies to all types of installations.

• The sensor must be placed between or next to the heating cables, with a distance of a minimum of 1 cm between the sensor and the heating cable.
• 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.
• Fasten the sensor by using the attachments on the sensor or glue it to the surface.

Technical specifications

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 4×1 mm2 (may be extended by the table in Appendix A)
Indication:| 2 x 16-character illuminated display.
Measurements

•  Ground sensor

•  Sensor tube (ground)

•  Roof sensor

| ****

Depth = 87 mm; Height = 74 mm Depth = 93 mm; Height = 98 mm

Depth = 15 mm; Height = 23,5 mm; Width 216 mm

Sensor cable extension

Ground system

Roof system

Connections

Dual-zone sensors:
Do not join sensor cable extensions from separate zones.

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 find that Danfoss offers DEVIwarranty valid from the date of purchase on the following conditions: During the warranty period, Danfoss shall offer a new comparable product or repair the product if the product is found to be faulty because 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 by 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 filled in, stamped and signed by the authorized installer performing the installation (The 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 the 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 DEVI warranty shall not extend to products that have not been paid in full. Danfoss will, at all times, provide a rapid and effective 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

Danfoss A/S
DEVI • devi.com • +45 7488 2222 • EH@danfoss.com.

Any information, including, but not limited to information on the selection of product, its application or use, product design, weight, dimensions, capacity or any other technical data in product manuals, catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download, shall be considered informative and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfoss cannot accept any responsibility for possible errors in catalogues, brochures, videos and other material. Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to the form, fit or function of the product.

All trademarks in this material are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.

Produced by Danfoss © 04/2024.

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