I have a Carrier 19 DH that is going to be mine. My centrifugal is limited to turbo core compressors. I'm going to be firing up a 19DH after it has not run for a year or so due to operator knowledge (my customers).
We are cleaning the condenser (punching the tubes) then going to restart the machine. There is a concern that it may be low on charge (R-11). My PT chart tells me it will run in a vacuum on the suction side and low pressure on the discharge side. In my 12 years as a tech I have mostly worked with 22 ranged pressures. So never having had to check for leaks on a system like this (low pressure) will the normal methods I use for R22 be OK?
I have the IOM for this chiller, What other material I can read to get me better prepared for this style machine?
If there is more info needed, or you would rather not post it here, I can PM you my cell or I could call you. Up to you.
If the machine is sitting positive now, leak check it using standard leak detectors good for CFC, if not, you have two options. Run hot water through the evaporator to elevate the refrigerant pressure or remove the charge and pressurize with nitrogen and trace R-22 no more that 10psig. At 15psig, you will blow the rupture disc.
Originally Posted by rbcsj
"I'm from Texas, what country are you from?"
If you have specific questions I am sure someone will be happy to answer them for you.
But first off let me say that you are going to:
A. Be prepare to violate a few EPA regulations or
B. Buy some pretty expensive equipment to do low pres. work
You have to decide if it is worth it for just one machine.
Not trying to discourage you but if you have the building uder contract you may want to sub out the chiller work. We sub to quite a few contractor in our area that have the building. You just have to find a company that will not try to take the building.
We have a good relationship with our contractors and can say that as far as I know we have never tried to step in on their air side work in these buildings.
With all that said what would you like to know?
We do have chillers in our contracts listing, mostly recips and screws around 300 tons & below. I've been working on those off and on for a few years So I am familiar with them. I know centrifugal chillers are different and for tear down work, that will get subbed out, not that handy with a micrometer....yet. I want to push forward into this area & am willing to read what I need to, buy what I need (or get the company to get it).
For now, this chiller is being given to me to get running, so that's what I plan to do.
send me your email address and I will send you some stuff.
trigs will set you up. iffen you have more qwestions, just post