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Article #15709

Hot Tub Controller

#15709
From: Dan Morera
Date: Thu, 17 Dec 1992 16:56
28 lines
1855 bytes
Greetings and Happy Holidays Netters,

I am developing a system to remotely control a hot tub, and I have not
previously worked with the large AC voltages needed to do so.

The hot tub is powered by both phases of the 120V power entering the house.  The switch
next to the tub does nothing more than connect / disconnect both of the powers from
continuing to the blower / heater / pump of the hot tub.  What I envision doing is
putting two solid state relays in series with the switches, and control the relays
with some simple 5V logic.

The lines are rated at 60 Amps each, so I have 75 Amp relays with sufficient heat
sinking capabilities.  The entire circuit will be placed in an environmentally sound
box.  Also, the wires connecting the relays to the switch are rated at 60 Amps.  The
logic controlling the relays have 20 mA sink current specifications.

What I want to know is if I left anything out.  I want this to be safe, but I don't
want to pay a contractor to do the work for me (which I may anyway).

Any comments or opinions would be appreciated.

---
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* "Could be worse -- could be raining."  * Daniel Morera            *
*********************************************************************
* "No walruses, please"                  * more_da@pts4.pts.mot.com *
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Technical Details
Message-ID: <1992Dec17.165633.9685@pts1.pts.mot.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!ftpbox!mothost!pts1!mcc44!more_da

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!ftpbox!mothost!pts1!mcc44!more_da
From: more_da@pts4.pts.mot.com (Dan Morera)
Subject: Hot Tub Controller
Message-ID: <1992Dec17.165633.9685@pts1.pts.mot.com>
Sender: usenet@pts1.pts.mot.com
Nntp-Posting-Host: 145.4.50.213
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Organization: Paging and Wireless Data Group
Date: Thu, 17 Dec 1992 16:56:33 GMT
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