[clancyb424]

First off, I want to say that my AK900's have been a great addition to my service tool arsenal...

However, I seem to be having a problem with the temperature sensor/display. When i turn the manifold on and select R410A, the temperature displayed is -135 F (with or without temperature probes hooked up). I've tried replacing batteries, hitting the Zero button, etc, but the temperature stays the same. If I select a different refrigerant, the temperature changes, but does not zero out. Ive tried using the Search function here, and also the FAQ on Digi Cool website, but cannot find any answers. Any help would be appreciated, as cooling season is upon us, and i really dont want to buy another manifold. Thanks in advance...

-Brendan

 

[anthonyac1]

have you tried calling digicool ??
I've had an issue with mine where the low side pressure transducer went bad. They sent a replacement out right away. I would recommend calling them

 

[jpsmith1cm]

Do you want to measure PSIA? Or would you prefer to do as most of the rest of us do and measure PSIG?

Press the "UNITS" button until the label beside the pressure is PSIG and the label for the sat temps are degrees F.

 

[anthonyac1]

Do you want to measure PSIA? Or would you prefer to do as most of the rest of us do and measure PSIG?

Press the "UNITS" button until the label beside the pressure is PSIG and the label for the sat temps are degrees F.

Good eye! I couldn't zoom in on my phone to see. But now that you pointed that out when I looked back it does look like an "a" at the end. That is probably the solution!!

 

[itsiceman]

You accidentally hit the "zero" button while in PSIA and not PSIG

If you want you can connect to your vacuum pump and pull as low as possible on your high and low side while in PSIA then hit the "zero" button. This will offset your PSIG reading and run the most accurate saturation temps for SH and SC measurements if you are working at higher elevations.

 

[clancyb424]

You accidentally hit the "zero" button while in PSIA and not PSIG

If you want you can connect to your vacuum pump and pull as low as possible on your high and low side while in PSIA then hit the "zero" button. This will offset your PSIG reading and run the most accurate saturation temps for SH and SC measurements if you are working at higher elevations.

I don't make it common practice to pull vacuum thru my charging manifold, but I will give it a try.

Thanks

 

[itsiceman]

Not hooked to a system and preferably without hoses. It's a setting. Use a micron gauge and if you can get below 50 microns I wouldn't bother with it.

 

[clancyb424]

Do you want to measure PSIA? Or would you prefer to do as most of the rest of us do and measure PSIG?

Press the "UNITS" button until the label beside the pressure is PSIG and the label for the sat temps are degrees F.

Yes, I had cycled thru all the units of measurement. Accidentally left it on PSIA. It is on PSIG now. Same problem. I will call DigiCool tomorrow.

-Brendan

 

[itsiceman]

Got another pic of the same problem?

 

[itsiceman]

Just in case the first row of numbers from the top is a pressure measurement the next row under that which was -132°F/-133°F in your first pic is the saturated temperature of the refrigerant selected at the pressure shown in the top row. The second row would read zero if you were measuring around 48 psig and R410A selected.
Can you discribe better what you are trying to zero out?

 

[kamersoutdoor]

What's saturation temp for 410 at -14 psig?
My pt chart doesn't go that far down for 410a.
Is op confusing saturation for ambient temps?

 

[itsiceman]

Thats about right for -14 psig
0 psig would be about -60°F

 

[71CHOPS]

That is the refrigerant saturation temp.

Just checked mine. Gauges zeroed, 410a is -51.3*psia
-60.9* psig

 

[itsiceman]

That is the refrigerant saturation temp.

Just checked mine. Gauges zeroed, 410a is -51.3*psia
-60.9* psig

You must be reading °C with the PSIA and °F with PSIG
Otherwise the saturation temps would be the same since the pressure didn't change

 

[71CHOPS]

Oops, I prolly was. Was in a hurry.