Coltri MCH 6 Owners, get in here, this thread is for you!!

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BigVitamin said:
I agree, all the information about the units is accurate, although I think 110 is a bad choice if in USA unless you absolutely can not get a 220 socket installed. The 110 15 amp is pretty standard in the USA. If your contractor was the over engineering type, they might be 20 amp. not only does the high amperage of the 110v model strain your electrical system it is not quite enough juice to run the motor efficiently and more importantly effectively. If you call Nuvair and talk to one of their reps, they can explain it better than I can. I already had a 220v socket in my garage, but if I didn’t I would have installed one. It wouldn’t cost a fortune to have an electrician come and install a 220 outlet, and I think it would be all around better in every aspect. Again, I urge you to talk to Nuvair, they aren’t going to try to up-sell you if you call. In fact, Mitch talked me out of a few things I thought would be useful and steered me in a better, more wallet-friendly direction.
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I know from personal experience with owning a Daystate LC-110 that everthing Big Vitamin says in this post is spot on. The LC-110 lasted four years with only 20 hours run time when it stopped building pressure beyond 2000 psi. The cost to ship back and forth was going to be $300 plus a $600 minimum quote for repairs from AoA. $900 repair bill for a $2K compressor after 20 hours runtime. In 20/20 hindsight an MCH6 is the better choice. 220V, more powerful 4 stage compression, 3HP motor vs. 1.1HP, double the fill speed, and less strain on the compressor. Spend the extra money and get an MCH6 or whatever Coltri calls it now. But if you can afford an even better built compressor, get an Alkin.
 
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rodm1 said:
Anyone have a photo of the filter setup? I need to get a filter and thinking of buying maybe using one from Coltri.
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Ther is a double filter bracket, steel line that goes from the water separator tower to the final drier filter. Very easy to install,and the air is wicked dry. Nuvair has the kits. 250.00 price but I think it’s worth it.

IMG_1944.jpeg


IMG_1943.jpeg
 
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Phasor00 said:
For those that purchased their compressors from Nuvair how was payment made. Were you able to use a credit card or did you have to do a bank wire? I'm in the preliminary stages of shopping for a new compressor and this one the Icon 220 v model looks like it might fill the bill.

Thanks!
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I recently purchased mine and I used my credit card. -Tony
 
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Well, I just got off the phone with Nuvair and ordered an Icon 220v with auto shut off and DRV 300 DIN valve for the fill hose. I also ordered extra filters and oil so should be good to go for awhile. This thread and reviews by the members here convinced me that this would be the right choice for me. So, for that I thank you.
 
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I did not shoot much this summer, so my MCH-6 compressor sat without running for about 4 months. I turned it on today and gave it a 20 minute warm-up, with no load. Then I placed the compressor under load, and filled two tanks, followed by a 20 minute cool down with no load. I had no issues.

My question- what is the longest period you have not run your MCH-6 for, and encountered no problems afterward? Alternatively, if you did encounter problems, what was that period of not running?

I am just trying to gauge this for future reference. Thank you.
 
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I have not been following the instructions, recommendations, suggestions etc.., concerning proper storage.

I store my Daystate/MCH6 inside with a dust cover. When I first got it I would run it periodically when not in regular use.
If I had a designated outlet and walked past the compressor all the time, then I would most likely push the button and allow it to run on a reg. bassis. I do not and it's been neglected in that regard for @6 months +/- with no ill effects.

That said, it's an expensive item, and I would follow whatever Coltri/Nuvair recommends.
 
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MCH6 pressure gauge took a dump. The liquid went out of the gauge into the condensation canister. That clogged the filter and caused the relief valve to open at 4200 P.S.I. I don't want to spend $80.00+shipping to have it happen again in 9 hours. I have seen that a couple of others have had the same problem. If you have had this happen, how many hours did yours have on it and if you haven't, how many hours does your mch6 have on it.
 
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my coltri mch6, the condensation tower shook so much the liquid had bubbles in the gauge on top of it,,, NOT good, had trouble reading it
so I attached a no bounce hammer to counter the vibration, worked good,,, no more bubbles, shaking greatly reduced
here is a photo of another compressor that I first had, but the principal is the same,,, the hammer head vibrates , but the tower and gauge are more steady

20200818_111937.jpeg
 
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jarmstrong said:
my coltri mch6, the condensation tower shook so much the liquid had bubbles in the gauge on top of it,,, NOT good, had trouble reading it
so I attached a no bounce hammer to counter the vibration, worked good,,, no more bubbles, shaking greatly reduced
here is a photo of another compressor that I first had, but the principal is the same,,, the hammer head vibrates , but the tower and gauge are more steady

View attachment 497533
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You need to patent that with a smiley face on the mallet.
 
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Here's some long term info about my Coltri MCH6 that some may find useful. @jarmstrong may find it particularly interesting.

My Coltri has always vibrated badly from day one. I tried all kinds of rubber shims and things to settle it down. I was told by Nuvair to NOT worry about it.

90 hours later my compressor stops pumping past about 2800.

Nuvair recommends the 100 hour service kit which is basically new valves. Nuvair sends me the wrong kit despite me giving them the serial number of the unit. Send back part of the kit while I wait for the proper parts. Get the right stuff and install it....nothing was any better. Then I'm told it may be the 4th stage...but Nuvair can't give me any advice on how to diagnose the actual problem. I dig around on some diving forums and find some valuable advice. Run the compressor and start checking temp on the output cooling lines between each stage. When you find one that isn't hot....that stage is your problem. In my case...it was, indeed, the 4th stage. Ok...order a new 4th stage cylinder kit. In the meantime while waiting for it to arrive I tear down the compressor again and remove the 4th stage cylinder and piston. What I find is a chewed up section of the rod where the piston skirt has been rubbing against it due to an off axis bore for the wrist pin. The off axis bore put the whole thing in a bind every rotation and ultimately wore out the piston and cylinder long before its time.

I get the new 4th stage kit and go to work installing it only to find it has a worse bind than the original. Same problem as the original...but way worse. I'll post a pic so you can see what I'm talking about. More phone time with nuvair trying to convince them that the sent me a bad part. I ordered the first 4th stage kit overnighted because I was already down for a week and just wanted to get the thing buttoned back up and done. After reluctantly agreeing to send me a replacement piston they would not overnight it. Ok...whatever. I just want to get this back working. 3 days later I get the new piston with a perpendicular wrist pin bore and get the compressor put back together.

Fire it up and it's smooth as silk. No vibration at all. The original vibrations were obviously due to the faulty 4th stage piston. The bonus is the compressor fills up an 88cuft tank at 7 1/2 minutes from 3000 to 4500. I think when it was brand new it was about 9 minutes or a little more and slowly deteriorated to 15 minutes before it quit at 90 hours.

After the fun I had on the phone with Nuvair during the repair period.... I didn't even bother to call and complain about getting a brand new compressor with a crooked 4th stage piston that would wear itself out prematurely.

Anyway...the takeaway is that the compressor shouldn't shake like a concrete vibrator....and if it does you surely have a problem that will rear its head eventually,

Mike
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I can confirm that my unit (quite new, only 5 hours) does not vibrate. I was rather (positively) surprised by this when I first fired up the unit. My previous shoebox compressor vibrated a lot and that was probably the reason why it broke down early.
The MCH6 only makes a lot of noise, but that's the nature of this high power beast.
 
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The other thing that's worth mentioning is that the representative who finally agreed to replace the part told me to be super careful wrapping it up when I sent it back to them because if there was a scratch on it, I was going to be charged. I take this to mean that they are going to put that bad part right back onto their stock shelf and hope the next guy that they send it to doesn't know the difference.

Mike
 
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