Davis 7745 Installation Manual

Daytime Fan-Aspirated Radiation Shield Kit Installation Manual

for Vantage Pro & Vantage Pro Plus Stations

Introduction

These instructions describe how to upgrade a non-aspirated Vantage Pro radiation shield to a Daytime Fan-Aspirated Radiation Shield. The upgrade kit can be installed on any Vantage Pro® or Vantage Pro Plus Integrated Sensor Suite (ISS) equipped with a round-plate non-aspirated, radiation shield. The round-plate non-aspirated radiation shield replaced the previous square-plate shield at the beginning of 2003.

Note: The Daytime Fan-Aspirated Radiation Shield Kit can only be installed on round-plate non-aspirated

radiation shields.

Components

The upgrade kit includes the items shown in “Figure 1” and “Figure 2”.

Closed Cap Plate

Open Cap Plate

Open Plate

Fan Unit

Solar Panel &

Mounting Bracket

Fan Plate

Figure 1. Daytime Fan Kit Components

Product # 7745

#8-32 x 1/2" Screws (3)

#8-32 x 3-1/4"

Screws (3)

Threaded Spacers (3)

#8 Split-Lock Washers (6)

Cable Tie Mount

#8 Flat Washers (6)

4" Cable Tie

12" Cable Ties (2)

Figure 2. Daytime Fan Kit Hardware

Power Cable

Assembly

#4 x 3/8" Screw

#4 Flat Washer

Cable Clamp

Tools Needed

You may need some or all of the following tools and other items to complete the upgrade:

• A medium Phillips-Head screwdriver

• A medium slot-tip screwdriver

Cabled ISS Only: Wire cutters

•

• Other tools as required to remove and re-mount the ISS

Wireless ISS Only: CR-123A 3-volt lithium battery (optional)

•

Note: If you are upgrading an ISS that has been in service for a year or more, you should consider

changing the ISS battery during the upgrade.

Installation Overview

Installing the Daytime Fan Kit is not very complicated and should take only 30 to 60 minutes to complete.

These are the steps to install the Daytime Fan components:

1. Put the console into Setup Mode.

2. Take the ISS down from its installed position.

3. Disassemble the standard radiation shield.

4. Remove the solar panel if you have a Wireless ISS.

5. Assemble the lower section of the fan-aspirated shield.

6. Install the fan unit.

7. Assemble the upper section of the fan-aspirated shield.

8. Re-Install the ISS.

9. Take the console out of Setup Mode.

Installing the Daytime Fan Kit

)

Put Console in Setup Mode

1. At your Vantage Pro console, press and hold the DONE key and then press the -

key to put the console in Setup Mode. This prevents the recepti on of erroneous data from the rain collector while you are removing the ISS.

Note: If the console acquires erroneous data during the upgrade, refer to “Take the Console Out of Setup

Mode” on page14 for instructions on clearing data. Additional information on clearing and setting console data can be found in the “Vantage Pro Console Manual.”

Take Down the ISS

CAUTION: Please work on your Vantage Pro ISS in a safe place. We strongly recommend tha t you take

down the ISS before beginning the upgrade.

If you are installing the Daytime Fan Kit on an ISS that has already been placed into service, you will need to take down the ISS and move it to a convenient and safe place to perform the installation.

1. At the ISS, open the Sensor Interface Module (SIM) housing cover and disconnect

the WIND (anemometer) cable.

Note: The SIM housing is located on the bottom of the radiation shield.

3-Volt Lithium Battery (Wireless ISS Only)

Solar Panel Power

(Wireless ISS Only)

AC Power (optional)

Console Cable

(Cabled ISS Only)

Optional

TEMP HUM

Cable Routing Channels

(press cables fully into channel)

SUN

RAIN

WIND

DIP Switches

(Wireless ISS Only

SIM Housing

Figure 3. SIM Connections

2. Cabled ISS Only:

3. You can now remove the ISS from its mounted position. Move it to a safe place to

install the kit components.

Disconnect the console cable from the SIM.

Disassemble the Standard Radiation Shield

Note: We recommend using a workbench or table to perform the following procedures.

Turn the ISS upside down with the rain collector cone

on the bottom.

2. Disconnect the RAIN cable and, if present, disconnect

the SUN and UV cables from the SIM.

3. Wireless ISS Only: Disconnect the solar power

cable.

4. Turn the ISS right-side up with the cone on top.

5. Remove the rain collector cone from the ISS base by

rotating the cone counter-clockwise. When the cone’s latches line up with openings in the base, you can lift the cone off. The cone fits in the base tightly and may require extra pressure to remove the first few times. See Figure 4.

Tip: Steady the ISS base between your knees when removing the cone.

Remove the three 8-32 x 4” screws holding the radiation shield plates together. Save these three screws for use in the next procedure, “Assembling the Lower Shield.”

#8-32 x 4" Screw

#8 Lock Washer

#8 Flat Washer

Twist to Open

Figure 4. Remove Rain

Collector Cone

Figure 5. Standard Radiation

Shield Assembly Diagram

ISS Base

Top Plate with

Insulating Disk

Radiation Shield

Open Plates

Temp/Hum

Sensor

Bottom Plate with

SIM Housing

Temp/Hum

Cable

7. Route the RAIN cable behind the drain and out the hole near the drain.

ISS Base

Rain Collector Tipping Bucket

Drain

RAIN Cable

Install Cable

Figure 6. Route RAIN

Cable Around Drain and

Tie Mount Here

Route Cable Here

through Hole

8. Place the adhesive-backed cable tie mount next to

the hole near the drain, and secure the cable with the small cable tie.

Figure 7. Secure the RAIN Cable

Cable Tie

Mount

Cable Tie

RAIN Cable

Route Cable

Through Hole

Wireless ISS Only: Remove the Solar Panel

Note: A new solar panel included with the kit replaces the original solar panel.

Insert a slot-tip screw-

driver between the solar panel retaining tabs and the solar panel. See Figure 8. .

2. Pry the retaining tabs out

just enough to free the solar panel.

3. Lift the solar panel

straight up to remove it from the ISS base.

Lift solar panel to remove.

Solar Panel

Solar Panel Retaining Tabs

Pry tab out to release solar panel.

Insert screwdriver between tab and solar panel.

Figure 8. Remove the Solar Panel

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