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Old Radiant Heating

I have a older Radiant Heating System powered by an AO Smith hydronic boiler. It was probably manufactured in the mid 60's. It has a White Rodgers aquastat 842A-26 with a high limit control, transformer, and circulator relay. The mechanical circulator relay appears to be bad. I want to replace just the relay but the parts are nearly impossible to find. Can I rig in a regular power relay that is 120Vac? or is there something special about a "circular relay" that I need to know? Could I use a solid state relay? or should I use a mechanic.

Here are a couple of stats I could find in some really old documentation:

Relay is 120VAC, 60 Cycles

Transformer is 120VAC 60 Cycles

Aquastat uses a 24v thermostat, and has a 24v pilot...

I would think something like this may work but Im no electrician so Im not sure:

<a href="http://www.automationdirect.com/adc/Shopping/Catalog/Relays_-z-_Timers/Electro-Mechanical_Relays/Power_Relays,_Open-Style,_40A_(AD-PR40_Series)/AD-PR40-2A-120A">Power Relay Link</a>

If anyone has any ideas on where to start I would be very appreciative.



PS: In case anyone asks... I want to keep the original boiler, and aquastat because It is a historical midcentury home that is in mostly original condition. I would prefer no replacing the original appliances if I can help it...
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