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Sounds like yours is working fine based on the temp and micron reading on that 1 1/8 set. I have the little brother (the Robinair 15400) and I know the noise you are describing. Bought it used btw....

Thanks for all the replies. I've decided to blow it out with nitro today and re-evac. During the blow out I'll be able to see how much oil/mist comes out anyway. If there's any problem I'll post a...

Since I posted earlier today I've been doing some research on this. Apparently the only potential issue is oil breakdown if the oils are incompatible. Seems like it might not be a problem since it is...

Yeah, it sounds strange to me too. There is supposed to be a valve in the pump (Robinair 15400) to prevent exactly this, but it must not be working.

I just checked the oil level now. There is...

Hi all,
I was working on a system last week and got vacuum pump oil sucked back into the system during evacuation. After pressure testing I had vacuumed down to 500 microns and blocked off the...

I assumed that guy meant to just wet the inside of the tube, not fill it with water. So the comment was not motivated by a general desire to see others suffer;-)

Interesting. Then we need to boil. Tell me more. What results would you expect.

Sorry, I don't understand. What calculation are you referring to? Do you know of some formula?

How fast should a vacuum pump pull down when connected directly to a micron gauge with copper line? I have a Robinair 15400. It pulls to 500 microns instantly (1-2 secs), but then takes up to two...

Moved to pro tools forum.

Tough call. I also live in N NJ and have a 4 ton serving a 2600 sqft two story and it is perfect. I am so glad I didn't go with a 5 as some recommended. My AC is both cool AND dry. The humidity...

Can anyone recommend a good place to order custom air filters?

I need 19.75 x 21 and 16.25 x 21,

Both in 1 inch pleated.

Thanks very much for this link.
This is definitely helpful, and the animation is excellent!

I've been googling all day. found nothing technical.

Can you suggest a search phrase?

I checked robinair.com, but the just had high level marketing type descriptions.

Hi all,
I am looking for information on how a vacuum pump works. Specifically, the rotary vane, oil filled type such as Robinair or YJ. Does anyone know of a link describing the operation principles...

Christopher,
You can PM me anytime. I'll help if I can. The hobby work started with heating and plumbing first. I really like hwbb systems. Hate forced hot air. The AC interest started with fixing...

Thanks. I feel a little better after hearing your explanation. But honestly, the existence of hobbyists in a field does not in any way degrade the value of the true masters of the craft. You guys are...

Man that hurts. From what I read in the rules it seemed like politeness was important in this forum, so I just thought I'd politely ask for permission to post. I don't see why you have to get so...

Hi all. This is my first post.

By profession I am an electrical engineer. HVAC is a hobby of mine. I just like it. I have studied technical books on the subject, and 7 years ago I installed two...