[thirdcoast361]

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[thirdcoast361]

Doin some rtu changeouts and one of our guys just started yanking wires out, he says there was a couple wires attached to this but ive never seen one

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[Tedak]

It sure looks like a SPDT relay. For what purpose is anyone's guess.

 

[jeremyr325]

It is a old contractor / relay

 

[Maakas22]

Single Pole Double throw Relay, Sometimes Used in (VERY) Old BMS Systems for load shedding and/or Double duty as a shut down in Fire control systems, (When used as a fire control shut down it is usually identified by the fact it is controlled by a RED low voltage wire coming from the fire control panel

 

[thirdcoast361]

Yeah we figured it out its a 24v relay from 1966 they are using for energy managment

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[Maakas22]

fyi the two small silver terminals in the middle of the relay are the ones that energize the control coil and judging by what remains of the two low voltage wires attached it wasn't acting as a fire control relay

 

[Maakas22]

Also it looks like High voltage wiring was attached to the Normally CLOSED contacts meaning when ever it was energized it broke the circuit of what ever it was controlling, Which is how a fire control relay normally operates, Which contradicts my previous post, although Fire controls normally just break the "R" feed from control transformer

 

[thirdcoast361]

Thats all they are doing is breaking the red theres another rtu that was still wired up it gets a signal to energize from a seperate control panel

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[yaytech]

yup, just a confusing relay...used to see em up in the hood panels

 

[Maakas22]

Yeah we figured it out its a 24v relay from 1966 they are using for energy management

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Yeaaaupp, That woulda been my first guess, This must be the week for Historical A/C Parts, I just came across Sporlan TXV with a "RIVETED" ID Tag and a date code of 1962 feeding a 50ton Dx Coil with 6cyl Belt driven Worthington Compressor and oil driven unloaders, on what was at one time a Piggly Wiggly Grocery store if that gives you any idea of age, Still operating and nothing to indicate it's going to Quit anytime soon

 

[DeltaT]

It's an old - probably 70's - RBM or GE SPDT relay.

 

[roadking]

Looks like to me just an old style relay.