Converting R22 readings to R290 on manifolds

[Carlz0r]

I got my manifold today, and it has readings for R12, R22, and R502. How would I convert the readings from that for R290. Thanks.

[n00b 0f l337]

Doesnt it have PSI ratings?

[runmc]

You will need to find a PT (pressure-temperature) chart that gives you the temperature of r290 at a certain presurre.:D

[Carlz0r]

Doesnt it have PSI ratings?
Yea, but theyre different for each refrigerant, so I figured R290 would be different as well.

[n00b 0f l337]

Yea, but theyre different for each refrigerant, so I figured R290 would be different as well.

Oh shiznat. I didnt realize this. I geuss its not a huge deal though when you consider that we tune for lowest temps.

[Carlz0r]

Oh shiznat. I didnt realize this. I geuss its not a huge deal though when you consider that we tune for lowest temps.
Yea, but I dont want to pressure test with too little or too much refrigerant, thats the thing.

[n00b 0f l337]

Dont pressure test with refrigerant. Use a spare compressor's discharge to get to around 250-300PSI. Discharge through a filter though.

[Carlz0r]

Dont pressure test with refrigerant. Use a spare compressor's discharge to get to around 250-300PSI. Discharge through a filter though.
My compressor says not to use more than 125 psi or rupturing may occur :confused: Seems a bit low, doesn't it?

[kayl]

You will need to find a PT (pressure-temperature) chart that gives you the temperature of r290 at a certain presurre.:D


if anyone needs one drop me a pm and ill email it to them, its in excell form so cant upload here:mad:

[wdrzal]

Dont pressure test with refrigerant. Use a spare compressor's discharge to get to around 250-300PSI. Discharge through a filter though.

Nerver use compressed air you'll pump air into the oil, use a inert gas (nitrogen) if you don't have that use the refrigerant you are charging with.

He was correct.

[Carlz0r]

Nerver use compressed air you'll pump air into the oil, use a inert gas (nitrogen) if you don't have that use the refrigerant you are charging with.

He was correct.
Yea, thats what I thought. And it's propane, so venting isn't going to harm anything, so long as its slow vented and not near the house.

[[XC] MarioMaster]

or that guy with the cigarette :P