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Old 11-06-2020, 05:17 PM
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platypus20 platypus20 is offline
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Default I Lost Another Air Compressor Pressure Switch

over the last 10-12 years, I‘ve lost about 6 air compressor pressure switches. They last roughly about 2 years, then one of the contacts burns off, then I have a dead air compressor. I lost one last night, and finally decided to correct the pressure switch issue. I finally assembled enough parts to install a contactor rated for 4 times the amp draw of the motor, I picked up 2 cabinets (customer was sending them to the scrap dumpster) and work graciously donated all of the pieces and parts necessary to finish up the installation.

The air compressor runs perfectly, the pressure switch now only carries the load of the contactor coil, and hopefully will last a little longer, I have a new pressure switch on order, the one being used now has one burnt contact and one functional one, the functional one will hopefully last until the new one gets here.
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  #2  
Old 11-06-2020, 06:24 PM
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Originally Posted by platypus20 View Post
over the last 10-12 years, I‘ve lost about 6 air compressor pressure switches. They last roughly about 2 years, then one of the contacts burns off, then I have a dead air compressor. I lost one last night, and finally decided to correct the pressure switch issue. I finally assembled enough parts to install a contactor rated for 4 times the amp draw of the motor, I picked up 2 cabinets (customer was sending them to the scrap dumpster) and work graciously donated all of the pieces and parts necessary to finish up the installation.

The air compressor runs perfectly, the pressure switch now only carries the load of the contactor coil, and hopefully will last a little longer, I have a new pressure switch on order, the one being used now has one burnt contact and one functional one, the functional one will hopefully last until the new one gets here.
That is the fix there, I don't care what manufactures say, those little contacts can't stand that much inrush current for very long. That IEC contactor will last a good while.
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Old 11-06-2020, 06:58 PM
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Originally Posted by 460 Delta View Post
That is the fix there, I don't care what manufactures say, those little contacts can't stand that much inrush current for very long. That IEC contactor will last a good while.
I did this to mine on the Quincy build, and put in a delay relay set for 10 seconds to keep the valves lifted till the motor is up to speed and oil is distributed.Then it starts pumping.

That has been a great idea for sub zero cold starts, no popped breakers, no slipping belts.
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Old 11-06-2020, 07:56 PM
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Originally Posted by Ironman View Post
I did this to mine on the Quincy build, and put in a delay relay set for 10 seconds to keep the valves lifted till the motor is up to speed and oil is distributed.Then it starts pumping.

That has been a great idea for sub zero cold starts, no popped breakers, no slipping belts.
Can you explain that in a little more detail?
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Old 11-06-2020, 07:59 PM
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Quote:
Originally Posted by Ironman View Post
I did this to mine on the Quincy build, and put in a delay relay set for 10 seconds to keep the valves lifted till the motor is up to speed and oil is distributed.Then it starts pumping.

That has been a great idea for sub zero cold starts, no popped breakers, no slipping belts.
I used to have to hold my hand over the inlet filter housing for cold starts in the winter
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Old 11-06-2020, 08:12 PM
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Can you explain that in a little more detail?
It should not be an issue for you in AZ. It's a "Great White North" thing with oil like molasses. I'm in crossover country climate wise unless it's mid -January. I run a full synthetic which has better flow at low temps. Basically it starts the compressor at no load and gets the oil flowing before any real load is applied .
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Old 11-07-2020, 07:57 AM
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Quote:
Originally Posted by Ironman View Post
I did this to mine on the Quincy build, and put in a delay relay set for 10 seconds to keep the valves lifted till the motor is up to speed and oil is distributed.Then it starts pumping.

That has been a great idea for sub zero cold starts, no popped breakers, no slipping belts.
I'm assuming you are using a TDR On Delay controlling a solenoid air valve to the unloaders?
I'm sure that heaters are used in pump gearcases in the oil patch up there, I wonder if one could be fitted to the crankcase of your compressor?
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Old 11-07-2020, 08:35 AM
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Just put a heat lamp on it 30 minutes before you want it . sure helps in my unheated garage .
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  #9  
Old 11-07-2020, 12:11 PM
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I had the same problem and resolved it the same way you did, no further problems.
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Old 11-07-2020, 08:44 PM
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Just put a heat lamp on it 30 minutes before you want it . sure helps in my unheated garage .
That's been my fix.
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