Adjust cut in pressure for MD 75/150

I have a md75/150 and need to increase the cut in pressure from 3 bar to 4. 5 - is this possible?

Comments for Adjust cut in pressure for MD 75/150

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Jun 17, 2015
duty cycle
by: Doug in

In addition to what I said earlier:

The 50% duty cycle means no more than 30 mins run time per hour, in any combination - 10/10, 20/20, 30/30, but NOT 40/40 - 40 run is a no-no.

That's according to Bambi manual.

Jun 17, 2015
cut-in adjustment
by: Doug in

From the manual:
The compressor will start running and automatically switch off at the preset pressure.
As air is used the pressure drops and the motor will restart at the preset pressure.
Approx 2 Bar differential.


Never tamper with the pressure switch settings, these are factory set."

Having pointed that out, what pressure is it cutting out at now?

If it's going to near 8 bar, then it should cut-in around 6 bar, near as I can tell.
I gather the switch is adjustable, so rather than spend ₤70 or $110 (+VAT), I'd try.

Just be sure the cut-out doesn't change, and that when you do whatever you do, that you don't exceed the 50% duty cycle.

Of course, if it's in warranty, check with Bambi to see if they can do anything for you.

Jun 17, 2015
Pressure for md75/150
by: Bill

In theory, yes. If the existing pressure switch is not adjustable, you can replace it with one that is.

The real question is, why do you want to do this?

The Bambi compressor is designed to run with the factory settings of cut in and cut out.

Increasing the cut in pressure setting will mean that the compressor will cycle more often, perhaps to its detriment.

Is your application not getting enough air? That being the case, increasing the cut in pressure is not the solution.

Increasing the capacity of the compressor may be, and that means either a larger compressor or another one in parallel with the original so that you can get air from two if the demand requires it.

If I'm way off the mark, sorry about that. I really don't have enough information to provide a single, specific response.


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