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The Protected Junction Box may be used in place of the junction box supplied
with your Davis Weather Monitor II
Junction Box offers limited protection from radio frequency interference (RFI)
and limited surge protection. It may be placed out of doors, but only if placed
inside one of Davis's shelters or other weather-proof enclosure. The cable run
between the Protected Junction Box and the station console may be a maximum
of 200' (60 m).
This instruction manual takes you step-by-step through the process required to
connect and mount your Protected Junction Box. Please take the time to read
this manual before beginning the process.
C
OMPONENTS
The Protected Junction Box includes the following components. Please make
sure you have all listed components before continuing.
Protected Junction Box
Two 16.5-foot (5 m) Ground
Wires (12 AWG)
Three #6 x 1" (25 mm long)
Self-Threading Screws
Two Cable Ties
Four Adhesive Pads
P
R O T E C T E D
J
U N C T I O N
™
or Weather Wizard III
B
O X
™
. The Protected
Product #7740
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Summary of Contents for DAVIS Protected Junction Box
- Page 1 R O T E C T E D U N C T I O N The Protected Junction Box may be used in place of the junction box supplied ™ ™ with your Davis Weather Monitor II or Weather Wizard III .
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Page 2: Tools And Materials Needed
Note: Do not throw away your existing junction box. The surge absorbers in the Protected Junction Box may “blow” if they absorb a direct or near lightning strike. In this case, you may use your old junction box to keep the station operating while the Protected Junction Box is repaired (provided your sensors haven’t “blown”... - Page 3 You may mount the Protected Junction Box against a wall or other vertical sur- face or you may simply set it down on a horizontal surface. 1. Remove the cover from the Protected Junction Box by pushing down on the tabs at the top until you can remove the tabs from the slots.
- Page 4 2. If you plan to mount the Protected Junction Box against a wall or other vertical sur- face, attach the base to the mounting surface using the #6 x 1” screws. Otherwise, skip this step. Use two screws (as pictured below) when attaching to a stud. Use three screws (as pictured below) in any other case.
- Page 5 10. Secure the ground wire by re-tightening the screw in terminal JP1. 11. If you want to use the Protected Junction Box’s RFI protection, repeat steps 8-10 using the other ground wire and terminal JP2 (the lower right of the circuit board).
- Page 6 Note: Even if you are not using a ground wire at terminal JP2, secure the junction box cable to the cable tie lug for strain relief. 14. Reattach the Protected Junction Box cover to the base. Make sure the tabs on top of the cover snap back into their slots, locking the cover in place.
- Page 7 ROUNDING THE ROTECTED UNCTION Grounding the Protected Junction Box at terminals JP1 and JP2 provides both surge protection and filtering of radio frequency interference (RFI). Surge Protection The Protected Junction Box includes a microgap surge absorber on each sensor input wire that shunts current pulses to ground. The surge absorbers operate...
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Page 8: Maintenance Instructions
Davis or send the Protected Junction Box back for repairs. Call the service department before returning the Protected Junction Box. While your Protected Junction Box is being repaired, you may use your old junction box to keep the weather station operating.