IR Ss5l5 pressure switch.

[Chadwilliam1]

I recently started a wiring project and before I started it I filled up my compressor one more time before disconnecting it.

I had it on a 30 amp breaker with 10 ga copper wire. I am finally getting around to wiring it back in and I noticed this on the pressure switch one of the legs for 220 seems to be melting.

I looked and found a new pressure switch for 70 dollars. If I am not mistaken is this the reason for a magnetic starter to prevent this?


Thanks Chad

Sent from my HTC 10

 

[redmondjp]

You had a loose connection there - yes, the magnetic starter will do the high-current switching, with the pressure switch just controlling the starter contactor. If you have a 3HP or smaller compressor, usually those pressure switches are rated to switch the motor directly. So it's up to you - there are plenty of starter wiring threads on this site which will help you know how to do it should you decide to add one.

 

[Chadwilliam1]

Connection was not loose I don't think . It is a 5 hp the compressor is 7 years old and this just started. I will do some reading and see if I can make a decision on a magnetic starter, but either way I should replace the pressure switch. Correct?

Sent from my HTC 10

 

[redmondjp]

Yes, you should definitely replace the switch. The high-resistance may have been at the contact itself inside the unit.

If your motor has built-in overload protection, you can also use a two-pole contactor (available online for $15-20) which is switched by your pressure switch. This would be simpler and less expensive than using a full-blown motor starter, which is nothing more than a contactor plus motor overload protection.

 

[Chadwilliam1]

Can you help me with some info on finding a contractor or motor starter?

 

[redmondjp]

Can you help me with some info on finding a contractor or motor starter?

Yes, but you need to first provide some information about your motor, either post a picture of the nameplate or post the FLA (full-load amps).

 

[Chadwilliam1]

FLA is 21.5 I it is a Ingersoll rand ss5l5
I will get a picture of the name plate when I get home from work tonight.

 

[Chadwilliam1]

would this work? I want to send low voltage through the pressure switch if possible. it says for 24 amps-40

https://www.factoryaircompressorpar...r-starter-5hp-230v-1-ph-air-compressor-parts/

Or i found this one.
https://www.amazon.com/dp/B00ATCCYXK/?tag=atomicindus08-20