Want to use my Honeywell T87 on new Argo control


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Old 11-24-14, 11:44 AM
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Want to use my Honeywell T87 on new Argo control

Looking for a little help on using my old T87 mercury thermostat on a new controller. The T 87 won't function properly because most of the new controllers will not provide enough current for the heat anticipator to work.

Should I try to use a Honeywell RA89A which provides a .4A coil/relay for the anticipator. The load side of the relay will then trip the TT on the new controller.

Just like the way the old thermostat works.

Thanks Matt OLDT87
 
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Old 11-24-14, 05:44 PM
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I would replace the thermostat with a digital model that can run on batteries like the Honeywell TH5110D.

Is your old stat a T87 round or a T87 rectangular stat?
Do you have an amp meter to measure the current between T and T when jumpered?

 
 

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