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Rain Collector Heater

Installation Manual

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.

Note: 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.

Note: This heater is not compatible with AeroCone rain collectors. You will need

to replace the AeroCone on your sensor suite, if you have one, with a

classic cone.

Components

The rain collector heater includes the following components. Please make sure

you have all listed components before continuing.

• — Includes heater element, thermostat, and terminal Heater assembly

block for power cable.

• Wall transformer with power unit

• Insulation blanket

• 50' (15 meter) heater cableThe Installation Hardware Kit includes:

• Three cable ties

• Two #6-32 x 3/4” screws

• Two #6-32 hex nuts

• Two #6-32 split lock washers

• Two #4 x 3/8'' self-tapping screws

Components

Heater Assembly

Insulation Blanket

Heater Cable

50' (15 meter)

Cable Ties (3)

Wall Transformer

with Heater Power Unit

#6-32 x 3/4"

Screws (2)

with Lock Washers

and Hex Nuts

#4 x 3/8"

Self-tapping

Screws (2)

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.

• 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

• Wire cutter

• Wire stripper or knife

• Cable clips or weather-resistant cable ties

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 extend the length up to 250’ (80 m) from the power unit to the

AC adapter using 22AWG -16AWG cable with PVC jacket. We recommend

using a 3M Scotchpak or Duraseal heat shrink splice connector when

extending the sensor cables.

Note: If you are using the heater in extreme environmental conditons, the

recommended cable coating may differ .

Use the table below to determine the minimum wire size for the desired lenght

of cable run:

Lenght of Cable Run Minimum Wire Size

Up to 60 feet (18m) 22AWG (0.50mm2)

60 - 100 feet (18 -30 m) 20AWG(0.75mm2)

100 - 160 feet (30 -50 m) 18AWG(1.00mm2)

160 - 250 feet (50 -80 m) 16AWG(1.50mm2)

If the heater cable is routed with any (i.e. any cable running from signal cable

a sensor 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:

• Keep the heater cable and the signal cable separated by several inches over

most of the length of the cable run.

• Use shielded cable for the heater cable or signal cable (shield must be

grounded).

Produktspecifikationer

Varumärke:	Davis
Kategori:	Inte kategoriserad
Modell:	DAV-7720

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