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priorm
New Member
Username: Priorm
Post Number: 8
Registered: 01-2006
Posted From: 162.44.245.51
| | Posted on Monday, April 09, 2007 - 12:39 pm: | 
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I'm looking for some advice regarding adding a switch to my Johnson Controls A419 remote thermostat.
I use the control for a variety of heating and cooling jobs around my home brewery and it works great. Unfortunately, to switch from heating to cooling, I need to remove the exterior case and either open or close a jumper pin.
I would like to install a small switch on the exterior that would allow me to open and close the jumper pin more conveniently without having to remove the casing and fumble with the small jumper pin.
Has anyone done this? If so, which switch did you use?
I measured about 5 VDC across the pin and very low amps rate (< 500 micro amps).
Does anyone have suggestions for an appropriate switch? |
Bill Pierce
Moderator
Username: Billpierce
Post Number: 6893
Registered: 01-2002
Posted From: 24.57.224.220
| | Posted on Monday, April 09, 2007 - 01:58 pm: |
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I suspect any small SPDT switch bought at Radio Shack and wired in place of the jumper would do the job. I would be sure to unplug the controller before changing from heating to cooling or the other way around. |
priorm
New Member
Username: Priorm
Post Number: 9
Registered: 01-2006
Posted From: 162.44.245.51
| | Posted on Monday, April 09, 2007 - 02:37 pm: |
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The switches that Radio Shack sells are identified as 12 VDC. Is this an issue since I was only reading around 5 VDC? |
dhacker
Advanced Member
Username: Dhacker
Post Number: 851
Registered: 11-2002
Posted From: 72.4.22.214
| | Posted on Monday, April 09, 2007 - 02:44 pm: |
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No . . they will work just fine. |
Dave Coppes
Junior Member
Username: Pale_dave
Post Number: 77
Registered: 07-2006
Posted From: 24.62.107.4
| | Posted on Tuesday, April 10, 2007 - 12:43 am: |
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Priorm - Let us know how this works out and/or post a picture of the finished product.
I too find the jumper in the A419 to be a pain. A switch is a great idea. |
priorm
New Member
Username: Priorm
Post Number: 10
Registered: 01-2006
Posted From: 162.44.245.51
| | Posted on Tuesday, April 10, 2007 - 02:14 am: |
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Will do. Thanks for the advice everyone. |
priorm
New Member
Username: Priorm
Post Number: 11
Registered: 01-2006
Posted From: 69.142.68.242
| | Posted on Sunday, April 15, 2007 - 04:04 am: |
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Well the deed on done. I added the switch and everything seems to be working fine. And yes, switching between heating and cooling modes is SO MUCH EASIER! I've been running the switch on a refrigerator for a few days. I have not tried to control a heating process for any extended period yet.
I used the a Radio Shack SPST Sub-Mini toggle switch on the JUMP1 posts of the Johnson Control A419.
Here are a few links:
Link to the switch:
http://www.radioshack.com/product/index.jsp?productId=2062509&cp=&sr=1&origkw=pc+toggle+switch&kw=pc+toggle+switch&parentPage=search
Link to the Johnson Control A419 spec:
http://www.blueridgecompany.com/documents/johnsoncontrol_a419bulletin.pdf
And finally, I've attached a few pictures to document the process. I realize that the pictures may leave some questions, so go ahead and post any questions.
Prost!
 |
priorm
New Member
Username: Priorm
Post Number: 12
Registered: 01-2006
Posted From: 69.142.68.242
| | Posted on Sunday, April 15, 2007 - 04:11 am: |
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And on final image of the assembled unit. |
dhacker
Advanced Member
Username: Dhacker
Post Number: 857
Registered: 11-2002
Posted From: 208.63.188.83
| | Posted on Sunday, April 15, 2007 - 12:40 pm: |
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Pretty pixelated on my screen . . I think you need to resize the image smaller so we can see the detail. |
priorm
New Member
Username: Priorm
Post Number: 14
Registered: 01-2006
Posted From: 69.142.68.242
| | Posted on Sunday, April 15, 2007 - 02:13 pm: |
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Yes, they definitely are grainy! I'm not sure if I can do anything about it, but here are the resized images.  |
Bill Pierce
Moderator
Username: Billpierce
Post Number: 6928
Registered: 01-2002
Posted From: 24.57.224.220
| | Posted on Sunday, April 15, 2007 - 04:02 pm: |
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They're about the quality of the photos I can take with my cell phone, but the resized images are certainly identifiable. |
dhacker
Advanced Member
Username: Dhacker
Post Number: 859
Registered: 11-2002
Posted From: 68.221.133.7
| | Posted on Sunday, April 15, 2007 - 05:48 pm: |
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Best I can tell, looks like a good build job . . even heat shrink on the wires! |
priorm
New Member
Username: Priorm
Post Number: 15
Registered: 01-2006
Posted From: 69.142.68.242
| | Posted on Sunday, April 15, 2007 - 06:41 pm: |
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100K limit for attachments.... |
Bill Pierce
Moderator
Username: Billpierce
Post Number: 6931
Registered: 01-2002
Posted From: 24.57.224.220
| | Posted on Sunday, April 15, 2007 - 09:43 pm: |
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Priorm, you have two options to reduce the file size: reduce the color depth and definition as you have done, or reduce the image dimensions. The latter is usually preferable; it preserves more detail and is more readable. Sometime you have to do both to get an image under the 100 Kbyte attachment limit.
(Message edited by BillPierce on April 15, 2007) |
Brews and Views Archive 2007 
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