Add Ditigal T-Stat - Dayton G73

beartoothweb · Feb 8, 2010

I read some threads on remote poteniometer type remote t-stats with these utility heaters. I have one, and love it, and really just use a long piece of PVC with a rubber end to turn the knob up and down.

However, I'd love to be able to wire in a ditigal t-stat so that i can set it more exactly. Most of the time, I'm only in the shop on saturdays, so I have to remember friday night to put the heat up.

Is this possible? Is there a way to wire the digital t-stat in either as a secondary with the knob, or to bypass it?

rickairmedic · Feb 8, 2010

Bear let me dig into this for you . I know it can be done with a contactor,transformer and a few other parts . I have a list here somewhere give me a little bit and I will give you a list of what you need to control the unit with a regular digital T-stat.

Rick

tstang90 · Feb 9, 2010

id love to have this info as well and is it hard to wire up??

rickairmedic · Feb 9, 2010

Ok guys here is the general idea to wire your units up so a thermostat controls them . You will need the following items

.

1. A 240 volt /24 volt coil contactor .

2. A 24 volt transformer I would get one that has a 240 volt power requirement .

3. A box to put these items into .

The general idea is you run the 240 volt circuit for the heater through the contactor and use the 24 volt transformer to switch the contactor on and off . I will try to get you guys some pictures of these items and part numbers to look for . The contactor is a standard household AC unit part and the transformer would also be a standard household AC part. 24 volts is what controls your houses HVAC system now through the thermostat.

Rick

rickairmedic · Feb 9, 2010

Ok heres your parts list

.

1. Box to put parts in . I am sure you could find one cheaper at a home store.

http://www.ddbunlimited.com/OSBP-14127-wall-pole-nema-enclosures.html

2. The contactor. This part could be found at any local HVAC supplier ( Grainger , Marcone appliance parts , Johnstone supply ) .

http://cgi.ebay.com/ws/eBayISAPI.dl...fe35ad3&itemid=390005235727&ff4=263602_263622

3. The transformer again available from any local HVAC supply house.

http://www.amazon.com/dp/B000H5XZKK/?tag=atomicindus08-20

Rick

rickairmedic · Feb 9, 2010

Ok now to put this system together you will run your 240 volt line for your heater into this box from the feed in your electrical panel ( this is the hot line ) . Hook it up to one end of the contactor . Hook the 240 volt leads from the transformer to the same end of the contactor you just hooked those wires to . Run 240 volt lines from the other end of the contactor to your heater . Take the 24 volt leads from the transformer and run them to your thermostat . You can buy 2 wire 18 guage thermostat wire at Homie desperate or Lowes . Hook the 24 volt wires from the transformer to the R and C positions on your thermostat . Also hook a wire from the 24 volt side of the transformer to one of the 24 volt side of the contactor ( these are on the sides of the transformer not top or bottom ) . Last run a wire from the W terminal on the thermostat to the other 24 Volt connector on the other side of the transformer . This will allow the Thermostat to control the 240 volts going to the heater at a set temperature by opening and closing the contacts on the transformer . I can esplain a little better if this explanation still causes you to go HUUUUUUUUUH

.

Rick

royalton10 · Feb 10, 2010

Re: G73 Electric Heater-Adding a Remote Thermostat?

--------------------------------------------------------------------------------

I wanted to use an external thermostat on my G73 but I didn't want to have to buy 100ft of #10 wire ($$) to put the thermostat on the other side of the barn. Here's what I did.

I used a 30amp, 2-pole contactor with a 24VAC coil. I had an old 24VAC blister pack lying around from a door bell system and a free battery powered thermostat that my parents gave me.

Here's a diagram:

Some notes...

Wire sizes: #18 for transformer to thermostat
#10 for 240V from panel to contactor and contactor to heater
#12 (or #14) for 24VAC transformer

Most thermostats have a two wire heat system wiring option. Use that diagram to connect the two wires to the thermostat.

Here's the contactor I used: http://cgi.ebay.com/ws/eBayISAPI.dll...m=350134046129

Here's the transformer I used:http://cgi.ebay.com/ws/eBayISAPI.dll...m=170301156295

Standard Disclaimer:
I'm not an electrician. I didn't even stay at a Holiday Inn Express last night. If you do this and burn down your house, I'm not responsible. Do this at your own risk.

With that said, this set up has worked perfectly for me for the last two months. That's not quite enough of a track record to say that it is a foolproof solution but I'm very happy with the results.

royalton10 · Feb 10, 2010

In post above I tried to copy and paste, did not succeed.

If you do a search by thread name of, "g73 electric heater adding a remote thermostat," and look at post by "squatch" of 2-16-09, you will see a diagram of 24v transformer with a remote thermostat.

Perhaps someone who can work the quote thread aspect of this forum, etc can actually post that reply into this thread.

Hope this helps!

Doug

royalton10

Falcon67 · Feb 10, 2010

rickairmedic said:
Ok now to put this system together you will run your 240 volt line for your heater into this box from the feed in your electrical panel ....

Rick

The only problem with your initial set up is that it kills the G73's internal workings - the heater uses a small t-stat to run the fan until the heating element cools. The better way might be to mount the contactor in the base of the heater and move the internal t-stat wires to the contactor. There's probably room in the base to mount a transformer too, saving the need for some $$$ NEMA box. Set it up in the base then just run your wires to the remote t-stat.

Link to other thread: http://www.garagejournal.com/forum/showthread.php?t=29958

Contactor - http://www.amazon.com/dp/B000979EVU/?tag=atomicindus08-20
Another transformer - http://www.amazon.com/dp/B00096SJ1W/?tag=atomicindus08-20

Tie the contactor poles across the internal t-stat, then use the remote t-stat and transformer to switch the contactor coil.

rickairmedic · Feb 10, 2010

Falcom good call . I dont have a G 73 I have a 3VU36 so I dont have the need for a remote T-stat myself 3VU36 is sitting on the workbench in easy reach. I may try to get ahold of a G73 wiring diagram and redo this although my setup would still work as the coils will still cool just more slowly than they would with the fan blowing across them for a minute after they shut down.

Rick

Falcon67 · Feb 10, 2010

I put a copy of the G73 manual on my web space - got tired of hunting one all the time LOL

http://raceabilene.com/machine/docs/G73_Heater.pdf

cthomas4 · Mar 9, 2015

Yes, I know this is a four year old thread forgive me for resurrecting it. I just wanted to share my experience as this thread and others on this board come up a lot when googling. Thanks to all the people who posted here previously. Using the instructions in this thread was able to successfully wire up the heater in my garage with a remote thermostat. I couple of things that I discovered

The Dayton G73 is the same as several other brands including the Fahrenheat 54C available at Amazon or Home Depot for half the price. However the NewAir G73 appears to be a lower quality product made by a different company.

The 240V contactor and 240V/24V transformer will both fit inside the the bottom of the heater as shown in the picture below. I just drilled a few extra holes and used some sheet metal screws to secure to the bottom of the fan. I could find niether of these at my local Home Depot or even my local electric supply company and ended up ordering them both from Amazon.

It is hard to find a thermostat that will go down below 45F, I ended up using a RiteTemp 6020 which I had lying around, which surprisingly went down to 35F. Just double check the specs on any thermostat you decide to use. You only need two conductor thermostat wire to get it to work but I used three conductor so that I could grab 24V from the transformer to power it as well.

Good Luck!

- C. Thomas

BmoreHunter · Nov 10, 2018

I just recently bought a G73 and am going to be doing the same thing as you did. My question, did you follow the same guidelines as the posts above?Want to make sure I am doing this properly on my end. Thank you

cthomas4 said:
Yes, I know this is a four year old thread forgive me for resurrecting it. I just wanted to share my experience as this thread and others on this board come up a lot when googling. Thanks to all the people who posted here previously. Using the instructions in this thread was able to successfully wire up the heater in my garage with a remote thermostat. I couple of things that I discovered

The Dayton G73 is the same as several other brands including the Fahrenheat 54C available at Amazon or Home Depot for half the price. However the NewAir G73 appears to be a lower quality product made by a different company.

The 240V contactor and 240V/24V transformer will both fit inside the the bottom of the heater as shown in the picture below. I just drilled a few extra holes and used some sheet metal screws to secure to the bottom of the fan. I could find niether of these at my local Home Depot or even my local electric supply company and ended up ordering them both from Amazon.

It is hard to find a thermostat that will go down below 45F, I ended up using a RiteTemp 6020 which I had lying around, which surprisingly went down to 35F. Just double check the specs on any thermostat you decide to use. You only need two conductor thermostat wire to get it to work but I used three conductor so that I could grab 24V from the transformer to power it as well.

Good Luck!

- C. Thomas

3rdgendslmech · Nov 11, 2018

BmoreHunter said:
I just recently bought a G73 and am going to be doing the same thing as you did. My question, did you follow the same guidelines as the posts above?Want to make sure I am doing this properly on my end. Thank you

I just got a comfort zone from tractor supply and mounted in my barn yesterday. I've only got 10' walls so its not ridiculous to climb up and change the temps or watt settings, but here's my plan....
I was just going to remove the potentometer switch and splice longer wires and lower it down and mount that part on the wall.

Add Ditigal T-Stat - Dayton G73

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