Original message
| johnb
 |  "Thermostat hookup question"
, posted Mon 10 Nov 17:55  
I have a shop space 38x80x16h I rent with no internal walls other than a small office. I have three natural gas ceiling furnaces 2-80,000btu at each end and a 140,000 in the center. The 2 80's have a regular 24v thermostat for each and the 140 has a 120v thermostat. They are all modines. I have two questions: 1) can I hook up the 2-24v heaters to one centralized thermostat so they run at the same time? I can't see a reason to have 1-80,000btu unit running at one end of the building trying to heat the whole building while the other one thinks it is warm enough. 2) is there a way to convert the 120v to a 24v thermostat? the one thatis there is wacky I can turn it up to turn the furnace on and it will run for a long time. then I decide I need to turn it down and I have to turn it past the point it was when I turned it up. I would replace it but can't find one in local stores, which is why I would like to switch it to a normal thermostat.
Thanks for help in advance
john
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Replies:
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| Xenos
Webmaster 
| "Re(1):Thermostat hookup question" , posted Mon 10 Nov 18:36
John I best suggestion I have is to install a 24vac relay on each unit in place of the existing thermostat. Then using the power from one, power a thermostat and have the thermostat power the relays. Please note that if you use a thermostat that has a heat anticipator you will need to turn the anticipator up.
Xenos.
The best way to escape a problem is to solve it.
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| | johnb
| "Re(2):Thermostat hookup question" , posted Tue 25 Nov 18:14
on the line voltage thermostat furnace: can I convert that to a 24v supply by just adding a transformer or will I need to change the gas valve system also? Are there certain values I should be looking for?
I am not sure why 1 of three furnaces is a line voltage while the other 2 are 24v.
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| | Xenos
Webmaster
| "Re(3):Thermostat hookup question" , posted Tue 25 Nov 18:50
There may be a few parts that require replacement. The easiest solution is adding a transformer and relay and have the transformer power the really through a standard thermostat. Have the relay close the 120 at the furnace.
Xenos.
The best way to escape a problem is to solve it.
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