2007-11-07 08:49:41 · 3 answers · asked by JEROME B 1 in Home & Garden ➔ Maintenance & Repairs
with a vaccuum pump. Time is based on line length,size,and any non-condensables that may be present. They will not suck out water, dust or debris in the system or lines. They remove moisture to a point and air, but you use a filter drier for what you cannot evacuate out. A perfect vaccuum is 29.92 inches. Use a micron gauge and try to get it below 500 microns and install a filter drier and you will be fine. A good nitrogen purge first is always good as well.
2007-11-07 10:43:22 · answer #1 · answered by candyman 4 · 0⤊ 1⤋
Evacuating your heat pump system removes any non-condensables, i.e. water, dust, etc. etc.
The length of time that is has to be dome is not base on temperature but based on inches of vacuum, try to get the vacuum as close as you can to 29.9 in of vacuum.
2007-11-07 10:21:34 · answer #2 · answered by trailng 3 · 0⤊ 0⤋
A vacuum (sp) pump and pump any trapped contaminants out of the system. How long the vacuum is run depends on the temp.
As a clarifcation on temp - it does have a factor on how long you should pull the vacuum if you are trying to pull more than just moisture out of the system. In particular, if you have other solvents (sealants - particularly those with acetone) involved, you need to allow the VOCs to be wick out. You can pull a high vacuum (even if it is near ideal) for a short period, but you will have fewer contaminants if you pull the vacuum longer. At higher temps, you don't need to pull the vacuum as long due to the effect the higher temperature has accelerating the process of removing the solvents.
2007-11-07 09:26:10 · answer #3 · answered by David M 4 · 0⤊ 3⤋