Rain Collector Heater Installation Manual
Contents
1. Length of Cable Run Minimum Wire Size Up to 60 feet 18 m 22AWG 0 50 mm 60 100 feet 18 30 m 20AWG 0 75 mm 100 160 feet 30 50 m 18AWG 1 0 mm 160 250 feet 50 80 m 16AWG 1 50 mm If the heater cable is routed with any signal cable i e any cable running from a sensor junction box or SIM be aware that for cable runs over 50 feet 15 m the heater cable s voltage may interfere with sensor voltages in the signal To prevent this interference do at least one of the following e Use twisted pair for the heater cable or the signal cable e Use shielded cable for the heater cable or signal cable shield must be grounded e Keep the heater cable and the signal cable separated by several inches over most of the length of the cable run Installing the Rain Collector Heater The instructions below will take you step by step through the procedure required to install the rain collector heater Make sure the wall transformer is unplugged until you are instructed to plug it in Attaching the Heater to the Rain Collector 1 Remove the rain collector s cone from the base and if necessary remove the mounting screws from the base of the rain collector 2 If screw holes for the rain collector heater are not already present in the base position the heater as shown on the next page with the terminal block facing away from the bucket and mark the location of the screw holes on the heater assembly Installing the Rain Colle2. Rain Collector Heater Installation Manual Note The Rain Collector Heater may be used to protect the Rain Collector s internal components from freezing and or to measure the moisture content of snowfall When the heater is on it is capable of melting snow at a rate of 1 4 6 mm of liquid precipitation per hour It may not be able to keep up with larger rates of snowfall The rain collector heater warms only the inside of the rain collector and the cone itself Please note that we have made every attempt to design and manufacture a safe product but Davis Instruments assumes no liability for any injury or damage caused directly or indirectly by the installation or use of this product Although the nominal heater voltage is not hazardous a short in the wall transformer could cause hazardous voltage to appear on the heater wires For safety you should always turn the heater s power unit to the OFF position before removing the rain collector s cone We also recommend that you unplug the wall transformer before removing the rain collector s cone This instruction manual is designed to take you step by step through the process required to install and use your rain collector heater Please take the time to read through this manual before beginning the process Components The rain collector heater includes the following components Please make sure you have all listed components before continuing e Heater A
3. ctor Heater Earlier versions of the rain collector did not come with built in holes for the rain collector heater If your rain collector does not have built in holes you need to drill them yourself following the instructions below Otherwise skip to step 5 Marking screw holes 3 Using a drill with a 5 32 4mm or a 3 16 4 8 mm drill bit drill holes in the marked locations 4 Using a drill bit with a large enough diameter to allow your power cable to pass through drill a cable hole in approximately the position shown below For the provided 50 15 m cable use a 9 32 7 2 mm or a 5 16 8 mm drill bit The precise location of the power cable hole is not critical Power cable hole Installing the Rain Collector Heater 5 Loosen the screw heads on the terminal block You will eventually secure the heater cable wires underneath these screw heads Terminal Block Terminal Block Screw Heads Rain collector heater terminal block Installing the Rain Collector Heater 6 Secure the heater assembly to the rain collector For stand alone rain collectors 7852 secure the heater assembly to the rain collector base using the 6 32 x 3 4 19 mm screws a lock washer and a hex nut as shown below p AN Hex Nut Lock Washer 6 32 x34 Screw m Securing the heater in a stand alone rain collector Stand alone rain collectors are used with all Weath
4. er Wizard Ill Weather Monitor II stations Vantage Pro2 rain collectors are included with all Vantage Pro2 Weather stations Note Installing the Rain Collector Heater For Vantage Pro2 rain collectors secure the heater assembly to the rain collector base using two 4 x 3 8 self tapping screws as shown below 4 x 3 8 Self tapping Screws Heater Assembly Knock out Hole for Heater Cable Securing the heater in an Vantage Pro2 rain collector 7 Using wire strippers or a knife strip 3 8 10 mm of insulation from the heater cable wires 8 If you have a Vantage Pro2 rain collector use a medium size Phillips head screwdriver to knock out the hole for the heater s power cable 9 Pass the heater cable wires up through the cable hole you just drilled stand alone rain collector or knocked out Vantage Pro2 rain collector Installing the Rain Collector Heater 10 Bend each bare wire into a U shape and secure each one under a screw head on the terminal block as shown below It does not matter which wire goes to each screw as long as only one wire goes to each screw Attaching cables to the terminal block of stand alone rain collector heater Terminal Block A SS z 2 TA CD Cable Tie for strain relief Heater Cable Attaching cables to terminal block of Vantage Pro2 rain collector heater Installing the Rain Collector Heater 11 Secure the cable to the heater assembly by runn
5. ing a cable tie over the cable and through the hole as shown You can cut off excess cable tie Cable Tie Securing cable to heater 12 To provide strain relief for Wote Cable howntier the cable place a cable tie inot attached th around the cable just above heater to make cable the hole through which this tie location more visible cable is running as shown below You may want to cut off the excess cable tie 13 Re attach or attach the rain Providing Strain Relief collector to the mounting surface Installing the Insulation Blanket 1 Fit the insulation blanket against the side of the rain collector cone pushing it as far inside the cone as it will go If fully inserted correctly the blanket should extend all the way to the top of the cone leaving a space of approximately 5 16 8 mm at the bottom to accommodate the base 2 Re attach the rain collector cone with insulation blanket to the base Inserting the insulation Powering the Heater Powering the Heater Note Running the Cables Run the heater cable from the rain collector to the location at which you plan to plug in the wall transformer power unit To prevent fraying or cutting of the cable secure it so that it does not whip about in the wind Use cable clips or weather resistant cable ties to secure the cable underneath the eaves of your house building or in a location similarly shielded from rain Make sure the cable is secure b
6. l 8 20 10 This product complies with the essential protection requirements of the EC EMC Directive 2004 108 EC Davis Instruments Quality Management System is ISO 9001 certified Davis Instruments Corp 2010 All rights reserved DAVIS E aailll Davis Instruments 3465 Diablo Avenue Hayward CA 94545 2778 U S A 510 732 9229 Fax 510 732 9188 E mail info davisnet com www davisnet com
7. nsure that the heater is Providing strain relief working you may want to set the power unit to the ON setting and then go to the rain collector to insure that the heater element is hot DO NOT TOUCH THE HEATER ELEMENT OR ANY METALLIC PORTION OF THE HEATER You should be able to feel the heat at a short distance from the heater element Using the Rain Collector Heater You may switch the rain collector heater on and off from the power unit OFF When the rain collector heater is off the indicator light on the power unit is also off ON When the rain collector heater is on it is capable of melting snow at arate of 1 4 6 mm of liquid precipitation per hour It may not be able to keep up with larger rates of snowfall When the rain collector heater is set to ON the indicator light on the power unit is also on The heater assembly includes a thermostat switch If the temperature at the thermostat reaches 110 F 43 C the thermostat will interrupt power to the heater element 11 When the temperature at the thermostat drops to about 85 F 30 C power flow to the heater element will be resumed Location of thermostat You can turn the heater on when you expect the temperature to drop below freezing and turn it off again when you are no longer worried about freezing conditions Product Number 7720 Davis Instruments Part Number 7395 096 Rain Collector Heater Installation Manual Rey F Manua
8. ssembly Includes heater element thermostat and terminal block for power cable e Wall Transformer with Power Unit e Insulation Blanket e 50 15 meter Heater Cable Components The Installation Hardware Kit includes e Three Cable Ties e Two 6 32 x 3 4 Screws e Two 6 32 Hex Nuts Two 6 32 Split Lock Washers e Two 4 x 3 8 Self tapping Screws Heater Cable 50 15 meter Cable Ties 3 S 4 x 3 8 Ss Self tapping Screws 2 6 32 x 3 4 Screws 2 Wall Transformer with Lock Washers with Heater Power Unit and Hex Nuts Components Tools and Materials Needed for Installation In addition to the components listed above you will need some of the following tools and materials Please be sure you have everything you need before beginning the installation e Medium Phillips head and Slot tip Screwdrivers Drill with 5 32 4 mm or 3 16 4 8 mm and 9 32 7 2 mm or 5 16 8 mm Drill Bits e Wire Cutter e Wire Stripper or Knife e Cable Clips or Weather Resistant Cable Ties Installing the Rain Collector Heater Choosing Cable for the Rain Collector Heater The rain collector heater comes with a 50 foot 15 m length of 22 gauge cable You may use 22 gauge two twisted pair wire for cable lengths up to 120 feet 36 m If you want to use single pair cable use the following table to determine the minimum wire size for the desired length of cable run
9. y placing clips or ties approximately every 3 5 feet 1 1 6 m Do not use metal staples or a staple gun Metal staples especially when installed with a staple gun have a tendency to cut the cables If your cable run extends more than 50 feet 15 m keep the heater cable and the rain collector cable separated by at least a few inches as discussed in Choosing Cable for the Rain Collector Heater on page 3 Attaching Cable to Power Unit 1 2 Bend each bare wire into a U Remove the base of the power unit by removing the four screws in the base Loosen the screw heads on the power unit terminal block You will eventually secure the heater cable wires underneath these screw heads Using wire strippers or a knife strip 3 8 10 mm of insulation from the heater cable wires Feed the cable through the hole in the power unit shape and secure under a screw head on the terminal block as shown below It does not matter which wire goes to each screw as long as only one wire goes to each screw Power unit terminal block Note To provide strain relief for the Replace the base of the power You may now plug the wall Using the Rain Collector Heater cable place a cable tie around the cable just inside the hole through which this cable is running as shown below You may need to cut off the excess cable tie in order to close the power unit unit transformer into an outlet To i
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