Hey my question is how do I test a transformer relay a limit switch Aquastat on a hydronic boiler using a multimeter. I need to know what I measure for what readings should I expect etc

Do you have a part number and brand name?

The brand of boiler is burnham hydronics its gas fired boiler I have the part number for the transformer only honeywell r8222b this number was on the relay

This is as close as I can come with those numbers.

http://customer.honeywell.com/techli...0s/69-0598.pdf

How do I check if its good or bad with a multitester

I posted the diagram so you could test it. If you cannot read the diagram then I do not really know what else to tell you. The diagram shows open and closed circuits and that is what you check for on a relay. It also shows the trigger or coil contacts to check for a good coil or if voltage is applied to the control circuit.

It might be best if you took a class or figured out how to use the meter you have before you undertake testing for fear of coming to the wrong conclusion.

The below links may help you better understand.

Use a volt-ohm meter to test electrical circuits: 3/21/99


How to use Digital Multi Meters or DMMs Safely - Safety Procedures for Inspecting Residential Electric Panels, volt meters, VOMs, electrical test equipment