Old 2 Wire Wiring Issue on an American Standard G25 system


  #1  
Old 10-14-06, 08:50 PM
K
Member
Thread Starter
Join Date: Oct 2006
Posts: 3
Upvotes: 0
Received 0 Upvotes on 0 Posts
Question Old 2 Wire Wiring Issue on an American Standard G25 system

I currently have an old natural gas American Standard G25 system (without circulating pump) that the well went bad along with the gas valve. Upon installing a new L4006A-1678 and V800A-1070, I had marked all the wiring connections so I could quickly wire all three wire sets back up in series (I believe) but now I am missing the original immersion control with the wires still attached to complete this installation. So I am in need of a little help of how the two parts should be wired so I don't ruin the new parts. I currently have two wires coming in from the thermostat/transformer and I already have the wires attached to the TH and TR (V800A) but I don't know how I should wire in the aquastat. This is where I am confused and the wiring diagrams are pretty vague on this setup. If I need to rewire to replace the old original 2 wire, especially since a new A/C unit was installed prior to me purchasing the home and they installed a seperate White Rodgers 1F86-244 Thermostat and I think it makes sense to just combine the two thermostats.

Any help would be appreciated. Thanks.
 
  #2  
Old 10-15-06, 09:31 AM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,682
Received 41 Upvotes on 39 Posts
Wiring

I presume this aquastat to be a normally closed, high limit, control. If that is the case, it needs to be in series with the thermostat & gas valve. Power should come from the transformer, thru the aquastat, & then to the thermostat & on to the gas valve.

I see no reason you could not use the same thermostat for heating & cooling. Connect the cooling power wire (Red?) to terminal RC, remove the jumper between RH & RC and connect the power for heating to RH. The other heat wire goes to W. Just make sure you do not have a line voltage thermostat for heating.
 
  #3  
Old 10-15-06, 10:11 AM
K
Member
Thread Starter
Join Date: Oct 2006
Posts: 3
Upvotes: 0
Received 0 Upvotes on 0 Posts
Electrical Flow Diagram

The aquastat controller can either be a low or high limit controller. I am actually looking for the electrical flow diagram on this 24 volt system on connecting the transformer, thermostat, aquastat controller, and gas valve. This system does not have a hot water heater or recirculation pump attached.
 
  #4  
Old 10-15-06, 11:56 AM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,682
Received 41 Upvotes on 39 Posts
Wiring

I'm not sure I completely understand your question but I think you are asking how you wire in the aquastat. If so, take one wire coming from the transformer & run it to the aquastat's common terminal. From the N/C terminal of the aquastat, a wire should go to the thermostat RH terminal. From the other thermostat terminal (W), the wire should go to the gas valve. The remaining wire from the transformer should go to the remaining terminal of the gas valve.
 
  #5  
Old 10-20-06, 07:20 PM
K
Member
Thread Starter
Join Date: Oct 2006
Posts: 3
Upvotes: 0
Received 0 Upvotes on 0 Posts
Thumbs up Thanks

Grady,

Forgot to thank you for your help. Got the system rewired, tested and everything is working perfectly.
 
  #6  
Old 10-21-06, 05:11 AM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,682
Received 41 Upvotes on 39 Posts
Glad to help

Now that you have the system up & running, I strongly urge you to call in a local pro just to make sure it is running safely, particularly from a carbon monoxide standpoint. It will cost you the price of a service call and the price of testing if they charge for that. This expense is worth every penny you pay.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: