tekmar 091 User Manual

090_D

Snow/Ice Sensor 090/094, Sensor Socket 091

Installation & Operation Manual

The tekmar Snow / Ice Sensor 090 / 094 and tekmar Sensor Socket 091 are used with all tekmar snow / ice melt controls. The 090 has a 65’ (20 m) cable while the 094 has a 208’ (63 m) cable.

The Snow / Ice Sensor is designed to sit flush with the slab surface after being

Snow/Ice Sensor 090/094

3–7/16"

(87 mm)

3/16"

(5 mm)

1–3/4"

(45 mm)

mounted into the Sensor Socket. The socket is installed directly into the snow melt slab halfway between the heating elements or pipes.

The sensor measures the slab temperature, sensor surface temperature and sensor surface moisture level.

01/14

Snow Melting

Snow/Ice Sensor Socket 091

3–1/2" (89 mm) 3–1/8" (80 mm)

Replaces: 07/09

3–13/16"

(97 mm)

090 Cable length 65' (20 m)

094 Cable length 208' (63 m)

Snow/Ice Sensor 090/094

Automatic snow/ice detection

• Slab temperature sensing

•

Long wire included so in field splicing is not necessary

•

Designed for long life in driveway and walkway installations

•

For use with tekmar Snow Melting Control type: 654, 661, 662, 664, 665 or 667.

A Watts Water Technologies Company

3/4"

(19 mm)

Ø 7/8" (22 mm)

Snow/Ice Sensor Socket 091 Features

Provides mounting solution for

• Snow/Ice Sensor 090/094

Includes mounting plate

•

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090_D - 01/14

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It is your responsibility to ensure that this sensor is safely installed according to all applicable codes and standards. tekmar is not responsible for damages resulting from improper installation and/or maintenance.

Read this Manual BEFORE using this equipment. Failure to read and follow all safety and use information can result in

personal injury, property damage, or damage to the equipment. Keep this Manual for future reference.

Step 1 - Check the Contents

Check the contents of this package. If any of the contents listed are missing or damaged, please refer to the Limited Warranty and Product Return Procedure on the back of this brochure and contact your wholesaler or tekmar sales representative for assistance.

Type 090/094 includes: • One Snow / Ice Sensor 090/094 with “O” ring • Four, #6-32 x 3/8" screws •

Type 091 includes: •• One Snow / Ice Sensor Socket 091 •• One protective plastic

plug

• One plastic mounting plate •• Eight, #6-32 x 3/8" screws •• One Installation &

Operation Manual

Four, #4-40 x 7/16" screws •• One Installation & Operation Manual

Step 2 - Sensor Installation

Location of the Sensor

The location of the snow / ice sensor determines how well the snow melt detector

• responds to conditions on the snow melting slab. The sensor measures the temperature of the slab surface, and would normally be installed in a location that is representative of the average surface temperature and moisture conditions. The only exception to this practice would be those applications where the sensor is placed in a specific problem area where ice or snow often forms first.

The installer should be careful to place the sensor in a location where it will not be

• affected by abnormal temperature conditions that may occur near buildings, hot air exhaust ducts or other heat sources, or sunny areas within a larger slab area.

•

As well as reading temperatures, the sensor also detects surface water. The installer should be careful not to place the sensor where standing water could accumulate on its surface. Standing water in the socket may cause the snow melt system to be held on far longer than necessary, as the control will be getting a signal that water is present even though the rest of the slab surface may be dry. In addition, the sensor should not be placed in areas where drainage is considerably better than the surrounding area.

•

The snow / ice sensor should not be installed in locations where vehicles park, near building overhangs or near trees since this may interfere with snow fall accumulation. If in doubt about the location of these obstacles, a second spare socket and conduit can be installed in order to provide a backup sensor location. Some tekmar Snow Melting Controls are capable of dual sensing. To determine if this feature is available, refer to the Installation & Operation Manual for the tekmar Snow Melting Control.

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Vehicle tire and pedestrian traffic can track water and contaminants onto the snow

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• melt area. If the snow / ice sensor is located in the traffic area, snow melting will be triggered by the passing traffic. This may be desirable in commercial areas where excessive traffic can cause the surface to become icy. In residential installations, the amount of traffic is usually limited, and it may be desirable to locate the snow / ice sensor away from the traffic area. This will reduce the number of snow melt events that occur and thereby reduce the annual fuel consumption.

•

Locate the sensor midway between the heating pipes or elements.

Conduit

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Place the sensor socket at the chosen location and run a conduit for the cable from the socket to the snow melting control. If more than the included length of cable is required to reach the control, run the conduit to a weatherproof junction box. The sensor cable should be run in its own conduit and not in combination with high voltage wiring.

The conduit length from the sensor to the junction box should be less than the length of cable supplied with the snow / ice sensor.

At the junction box, additional 18 AWG, 5 conductor cable can be spliced on to increase the total length to 500’ (150 m) from the sensor to control.

Avoid tying the conduit to the rebar within 6’ (2 m) of the socket. This allows the rebar grid to move without disturbing the position of the socket.

Sloped Surfaces

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The top of the snow / ice sensor should be flush and parallel to that of the snow melt surface.

When the sensor is installed on a sloped driveway, the sensor must be installed near the lowest elevation of the slope. This is required since the melting snow or ice runoff water will drain toward the lowest point on the driveway and keep this area wet for longer periods of time.

Installing the Socket

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A mounting plate has been included to simplify the installation of the sensor socket. When possible, the mounting plate should be located directly on top of gravel in order to provide good drainage. If the slab is more than 4" thick, a mound of crushed rock or a styrofoam or wooden block can be used to elevate the socket. A hole must be punched or drilled in the styrofoam or wooden block in order to provide drainage.

Failure to provide adequate drainage under the socket may reduce the life expectancy of the snow / ice sensor.

The mounting plate can be fastened to the ground by driving 1/2" (12.7 mm) rebar through the four holes located on each of the four corners and then tying the mounting plate to the rebar.

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Mounting Plate

1. Drainage hole

2. Socket screw holes

3. Rebar holes

4. Rebar tie holes

5. Conduit tie holes

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