Wiring a Heat Exchanger and Modine and Pump.

 
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hotblast1357
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Post by hotblast1357 » Mon. Sep. 07, 2015 5:41 pm

Are those goin to replace the ones I already got? Which ones do I need?

I would still like to figure out why my fan and pump are coming on without tstats calling for heat. I don't know if I maybe have wires rubbed through somewhere or something, but I still don't think it will work correctly because once one thing calls for heat it's goin to back feed 24v to everything anyways.


 
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Post by hotblast1357 » Fri. Sep. 11, 2015 5:24 am

This is currently how I have it wired.

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Post by Scottscoaled » Fri. Sep. 11, 2015 7:38 am

You are really lucky you are not burning your card in the air handler.

 
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Post by hotblast1357 » Fri. Sep. 11, 2015 8:18 am

By jumping the terminals to power the fan?

 
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Post by Rob R. » Fri. Sep. 11, 2015 9:22 am

You have multiple 24v power sources connected together. Not good. One remedy would be to use a relay with a set of dry contacts for the fan, and the modine. You can use a relay-in-a-box like Scott mentioned a while back, or Honeywell R845 relays.

 
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Post by hotblast1357 » Fri. Sep. 11, 2015 10:14 am

ok so they don't make a relay that I can buy and wire in and it will work correctly? What I already have isn't a relay in a box?

 
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Post by hotblast1357 » Fri. Sep. 11, 2015 1:43 pm

McGiever wrote:You must use 2 relay boxes, 1 per zone. Each t'stats pull in the appropriate magnetic coil.

Each relay will start the same pump on 1st pole/set of contacts and at the same time start the the appropriate fan on the 2nd pole/set of contacts of that relay.

So , no backfeed, each fan (2) has a separate contol relay and only that one fan will switch on for that one t'stat/relay/zone.

As Scottscoaled is saying...in order to use the modine as a dump you only need the dump zone a'stat to wire parallel (24v) with the modines 24v t'stat wires at the modine's relay box magnetic coil...no addition wire needs ran to the garage...it is done with extra/parallel 24v control at the relay box and the relay will use the same existing 120v wire for power out to the fan.
Can anyone do up a simple sketch to show how this is wired?


 
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Post by McGiever » Fri. Sep. 11, 2015 3:01 pm

Remove the 2 -24v wires, for starters.
HB_Wiring.jpg
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The Dump A'stat needs wired to the modine's t'stat...not to the fan/coil t'stat.
Then add another 24 volt relay with contacts (@120V) to pull the pump in with the modine t'stat.

You must use the same exact 120v circuit for the pump in either zone...bad things will happen if you try to use 2 different circuits. :taz:

This is why it was suggested from the start to get double pole-single throw relays...to do 2 function off one t'stat you must use double pole relay.
You were able to get away with only one pole at the fan coil because the fan controls were already at 24volt, whereas the modine's fan and pump are both at 120 volts.
Last edited by McGiever on Fri. Sep. 11, 2015 4:28 pm, edited 2 times in total.

 
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Post by Scottscoaled » Fri. Sep. 11, 2015 3:37 pm

Scottscoaled wrote:Two of those will work just fine :) Set both next to pump/boiler. A 14-2 and a thermostat wire will handle the Modine. The air handler,,, will take care of itself with a pair.


Read this. After you do it, you need to get two RIB's. Go to eBay and look for Relay in a Box. They are $10 a piece. You will need two. If you don't want to buy them, send me your mailing address and I will send you two. I must have a hundred of them. After the controllers are where they need to be, the wires are ran where they need to be, we can talk.

The rest you can do with a call.

 
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Post by hotblast1357 » Thu. Sep. 24, 2015 7:05 am

McGiever wrote:Remove the 2 -24v wires, for starters.
HB_Wiring.jpg
The Dump A'stat needs wired to the modine's t'stat...not to the fan/coil t'stat.
Then add another 24 volt relay with contacts (@120V) to pull the pump in with the modine t'stat.

You must use the same exact 120v circuit for the pump in either zone...bad things will happen if you try to use 2 different circuits. :taz:

This is why it was suggested from the start to get double pole-single throw relays...to do 2 function off one t'stat you must use double pole relay.
You were able to get away with only one pole at the fan coil because the fan controls were already at 24volt, whereas the modine's fan and pump are both at 120 volts.
Mcgiever, all I need to correct my mistakes with your correction is one additional R89A relay correct?

 
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Post by McGiever » Thu. Sep. 24, 2015 12:57 pm

Yes :)

 
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Post by hotblast1357 » Thu. Sep. 24, 2015 1:42 pm

And just make sure I get my 120v for the pump from the same place.

 
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Post by McGiever » Thu. Sep. 24, 2015 3:06 pm

Yes

 
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Post by hotblast1357 » Fri. Sep. 25, 2015 7:47 pm

New problem

so this is where I have the t'stat wires going to my furnace to turn on just the fan while also turning on the pump. If I unhook the t'stat wires from the fan, then the pump works correctly with the relay, and if I unhook the t'stat wires from the pump relay the fan comes on correctly, but if I have them both hooked up things start humming. Obviously something is back feeding on the 24 volt side, is there some other place I can run my TT wires in this diagram that will allow only my fan to come on?

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Post by waldo lemieux » Fri. Sep. 25, 2015 11:18 pm

hotblast1357 wrote:but if I have them both hooked up things start humming. Obviously something is back feeding on the 24 volt side,
Re: Wiring a heat exchanger and modine and pump.

PostBy: waldo lemieux On: Tue Aug 25, 2015 7:41 am
Are you using a strap-on aquastat to turn the modine fan on and off? I think that your going to have a problem using the same t-stat to turn on the circ thru the aquastat and the fan in the furnace at the same time as there are two different transformers and my limited understanding of low voltage is that you cant mix different power supplies.

Re: Wiring a heat exchanger and modine and pump.

PostBy: Rob R. On: Fri Sep 11, 2015 9:22 am
You have multiple 24v power sources connected together. Not good. One remedy would be to use a relay with a set of dry contacts for the fan, and the modine

PM and CALL SCOTT


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