240V Heating Element - 1 or 2 SSRs - Home Brew Forums
Register Now For Free!

Home Brew Forums > Home Brewing Beer > DIY Projects > Brew Stands > 240V Heating Element - 1 or 2 SSRs

Reply
 
Thread Tools
Old 01-28-2010, 10:51 PM   #1
Douglefish
Recipes 
 
Dec 2008
Posts: 244
Liked 1 Times on 1 Posts



When using a 240 V Heating Element, should you use 1 or 2 SSRs?

If you only use 1, will the element still be hot?

 
Reply With Quote
Old 01-28-2010, 11:03 PM   #2
The Pol
Recipes 
 
Feb 2007
Posts: 11,454
Liked 97 Times on 82 Posts


Quote:
Originally Posted by aarondrich View Post
When using a 240 V Heating Element, should you use 1 or 2 SSRs?

If you only use 1, will the element still be hot?
It will be HOT, but not hot...

It wont give off heat, but there is still a live wire there.

 
Reply With Quote
Old 01-28-2010, 11:06 PM   #3
Douglefish
Recipes 
 
Dec 2008
Posts: 244
Liked 1 Times on 1 Posts


So what is the advantage of using 2 SSRs?

 
Reply With Quote
Old 01-28-2010, 11:17 PM   #4
The Pol
Recipes 
 
Feb 2007
Posts: 11,454
Liked 97 Times on 82 Posts


Quote:
Originally Posted by aarondrich View Post
So what is the advantage of using 2 SSRs?
If you use (2) then when the element is commanded off, NONE of the legs are hot. If you use (1) then one leg is always hot... you may not want the element leads hot when it is "off"

 
Reply With Quote
Old 01-28-2010, 11:42 PM   #5
Brewmoor
HBT_LIFETIMESUPPORTER.png
 
Brewmoor's Avatar
Recipes 
 
Aug 2009
Colorado
Posts: 929
Liked 15 Times on 15 Posts


You can use a standard relay as well for the second leg if you want. Because you will not be cycling the second leg on/off very often. One of the reasons to use and SSR is lifespan of the relay. SSR has no moving parts. So a PID or another device can constantly turn the power on and off without much worry. With a mechanical relay, if you cycled it that often it would probably fail on you.

If you go with a mechanical relay make sure the relay is rated for the amperage you are using.

Also with a mechanical relay or SSR make sure the switch you are using is passing on the correct voltage for the relay. Mechanical relays have coils that are rated for the voltage you have at your switch. So make sure you get the right one.
__________________
"What the mind can conceive and believe, the mind can achieve."

My build thread. Compact Single Tier!

 
Reply With Quote
Old 01-29-2010, 01:55 AM   #6
CodeRage
Death by Magumba!
HBT_LIFETIMESUPPORTER.png
 
CodeRage's Avatar
Recipes 
 
Aug 2007
Melbourne, Fl
Posts: 2,222
Liked 50 Times on 21 Posts


You can do it with one, but it is best to use two.

Say you turn the element off, and pour in some more water for what ever reason. Some water runs down the back of the pot and hits the 1 live wire. The water conducts to the pot which conducts to the liquid inside of it, travels up the pouring liquid and into the metal pot your holding.

You wonder how much you trust that GFCI and ask yourself one question: do I feel lucky? Well, do ya, punk?

Kidding about the punk, couldn't help myself. But you can see how in one instant you'll wish you had splurged for the second SSR.
__________________
Brutus 20e build | Electrical Primer for Brewers | Auber SYL-2362A2 PID Install & Config
So as I am walking out the door this morning I think to my self:
"self, going to work on Monday is like knowing you're going to get kicked in the nuts. You just don't know when or by who"

Reason: brainfart

 
Reply With Quote
Old 01-29-2010, 01:59 AM   #7
The Pol
Recipes 
 
Feb 2007
Posts: 11,454
Liked 97 Times on 82 Posts


I went with (2) SSRs per element on my new system for that reason. I dont want (4) heating elements with live wires running to them when the system is "off". I want it off... off.

(10) SSRs total... 8 for elements and 2 for pumps

At $16 for an SSR+Heatsink... it was cheap to justify

 
Reply With Quote
Old 01-29-2010, 03:59 AM   #8
stevehaun
HBT_LIFETIMESUPPORTER.png
Recipes 
 
Dec 2006
Hudson, WI
Posts: 748
Liked 46 Times on 39 Posts


This is why I have a DPST switch for each of my elements. I don't use my PID to turn my elements on and off. I simply use the PID to control temp. Hence, I only have one SSR per element. If I used the PID to turn my elements on and off, I would have two SSRs per element.

 
Reply With Quote
Old 01-29-2010, 04:11 AM   #9
CodeRage
Death by Magumba!
HBT_LIFETIMESUPPORTER.png
 
CodeRage's Avatar
Recipes 
 
Aug 2007
Melbourne, Fl
Posts: 2,222
Liked 50 Times on 21 Posts


Quote:
Originally Posted by stevehaun View Post
This is why I have a DPST switch for each of my elements. I don't use my PID to turn my elements on and off. I simply use the PID to control temp. Hence, I only have one SSR per element. If I used the PID to turn my elements on and off, I would have two SSRs per element.
With an HOA switch and 2 SSRs you have the best of both worlds.
__________________
Brutus 20e build | Electrical Primer for Brewers | Auber SYL-2362A2 PID Install & Config
So as I am walking out the door this morning I think to my self:
"self, going to work on Monday is like knowing you're going to get kicked in the nuts. You just don't know when or by who"

 
Reply With Quote
Old 01-29-2010, 04:30 AM   #10
Bobby_M
Vendor and Brewer
HBT_SPONSOR.png
 
Bobby_M's Avatar
Recipes 
 
Aug 2006
Whitehouse Station, NJ
Posts: 23,381
Liked 1791 Times on 1139 Posts


It's already been said but I would think you want a DPDT mechanical kill switch for the "real" off off.
__________________
Welcome to BrewHardware.com. I love you.
New Stirplates are IN!
Chugger Pumps, Pump Kits, Camlocks, Sightglasses, Clear USA made Silicone Tubing, RIMS, Electric Install Parts, etc.

 
Reply With Quote
Reply
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
electric heating element Brewpastor Brew Stands 9 01-01-2012 10:20 PM
Will this do what I need for a heating element control? RedIrocZ-28 Brew Stands 9 12-28-2009 05:33 PM
Heating element Wade E Kettles, Mash Tuns & Hot Liquor Tanks 27 12-21-2009 03:43 AM
Need advice- Using 240V water heater element for 120V? MTEXX Brew Stands 7 10-29-2009 03:20 PM
No + / - on heating element RockfordWhite DIY Projects 11 10-04-2008 04:33 PM


Forum Jump