Replacement of bad on off switch on 5z032A

by Bruce Taylor
(Jacksonville, FLorida)

I have a model 5z032A. I am looking for the on/off switch assembly.

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Jan 17, 2016
pressure switch?
by: Doug in s.d.ca

You mean the pressure switch?

Google CW301400AJ, which is the replacement kit.

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Regarding Wrong Pressure switch on Speedaire 2Z498

by Danny
(Wood-Ridge, NJ USA)

Tag on Tank Speedaire 2Z498

Tag on Tank Speedaire 2Z498

Tag on Tank Speedaire 2Z498
Tag on Motor Speedaire 2Z498
Tag on Compressor Speedaire 2Z498

Bill,

Thank you for your help on my original questions. I am enclosing pictures of the plates on the tank, compressor, and motor.

Although the tank is in excellent condition with no visible rust, I did not see any specified tank pressure rating. Maybe the numbers on the plates mean something to you regarding the pressure rating. Should I stay with the psi numbers you told me in your last post?

I plan on buying the pressure switch that you suggested in your last post. Can you also suggest a pressure relief valve to purchase so I can submit one order on amazon.

Regarding the plumbing for the unloader; should that be copper, aluminum, or plastic? Is that the type of thing that I can go to HomeDepot or Lowes to buy?

Thank you again for your help!

Danny

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Sep 08, 2014
Pressure switch on Speedaire 2Z498
by: Bill

Danny, I don't know which was the original post, as there are thousands.

The labels are useful in that they confirm that yours is a 1/2 HP motor on the compressor, and giving you some electrical specifications and guidance.

I don't recall what was the pressure switch settings on your original post, but an upper pressure in the 135 - 150 PSI should be OK, again, as long as the tank is sound. That I cannot tell you from a post or photo.

The air going to a compressor tank gets hot, and often the line to the tank does too, and if the unloader line is running adjacent to the motor or pump, it too can get quite hot. Unless it's high heat plastic you might get melting. It's easier to use soft copper tube in my opinion, as long as you can either get the compressor fittings or can use a flare tool. Copper is heat resistant and does not corrode.

Your PRV will typically have a cracking pressure higher than the cut out of your pressure switch, so the pressure switch reaches cut out before opening the PRV, and yet the PRV will open if the pressure switch fails and will dump the air before pressure becomes critical. Here's one. Look for others with the correct cracking pressure if this one does not suit.

Cheers,

Bill




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Broken speedaire pressure switch

by Chris mosloski
(Truman, Mn)

While hauling my compressor home it tipped over and broke the pressure switch off,i couldn't find the exact replacement

what i was wondering is what is the small line coming off of the cylinder head and where does it plumb into does it have anything to do with the pressure switch

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Nov 01, 2015
Broken speedaire pressure switch
by: Bill

Maybe yes, maybe no, Chris.

You don't provide the model number, so I cannot try to find a picture on line to help you determine the function.

I can say that typically the line from the pump head enters the tank through a check valve. Upstream from that check valve (may be part of the same fitting ) a line goes over to the unloader valve on the pressure switch.

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New pressure switch and not building pressure past 40 psi

by Chris
(Mn)

Speedaire not building pressure past 40 psi motor kicks out.

I have a 3z424 and the pressure switch got broke off i called Grainger but they couldn't find this model. So i got a switch from the local hardware store and it only builds to 40 psi. I need either the right switch or one that is compatible. What is the little 1/8 copper line for? Could this have something to do with that?

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Aug 09, 2015
Broken pressure switch
by: Bill

Chris, if you didn't get a pressure switch with an unloader valve the plumbs the way yours is supposed to, that could be the reason why your air compressor cannot pump up past 40 PSI. The air is escaping.

See the pages on this site about what the pressure switch does, what the unloader valve does, and how they work together.

If yours isn't plumbed properly - the 1/8" copper line I expect - your compressor won't work properly either.

Add a comment after you've see the pages and applied that info to your compressor rebuild if you wish.

Bill

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