multisync
19-12-2008, 10:52 PM
We have inherited a site which has several VRV's installed in 2006 R410a.
Got a call about one blowing the trip. Checked it over found the 1st stage std gone bang.(It also looks like the inverter has been changed at some point too?)
We took the old one out and checked the oil. The first pic shows the amount of oil we got out of the comp with it upside dwon for 5 minutes. On speaking to DUK it possibly appears there has been carbonisation of the oil due to lack of nitrogen during installation. This has led to the oil return blocking and hence emptying out of the compressor.
Of course if this oil is bad then the rest of the oil in the system is bad.
The problem (or one of them) is that you cannot drain out the other two compressors as there is no drain point or equalisation line.
So we think we will have to remove the 3 x separators in a lump by unbrazing HG in/out + 1/4"oil return line. Then it can be lifted out and drain each pot out.Then we can return it and fill it with fresh oil.
We would like to uprate the silly little spun filter on each return line so we can filter what we can't remove to clean it up. Now I guess DUK won't warrenty any additional non std filter in the system but it's obvious the copper spun ones are no good for this job.
Throwing it out to the floor -what how why would you clean up a system like this
Multisync
London
Got a call about one blowing the trip. Checked it over found the 1st stage std gone bang.(It also looks like the inverter has been changed at some point too?)
We took the old one out and checked the oil. The first pic shows the amount of oil we got out of the comp with it upside dwon for 5 minutes. On speaking to DUK it possibly appears there has been carbonisation of the oil due to lack of nitrogen during installation. This has led to the oil return blocking and hence emptying out of the compressor.
Of course if this oil is bad then the rest of the oil in the system is bad.
The problem (or one of them) is that you cannot drain out the other two compressors as there is no drain point or equalisation line.
So we think we will have to remove the 3 x separators in a lump by unbrazing HG in/out + 1/4"oil return line. Then it can be lifted out and drain each pot out.Then we can return it and fill it with fresh oil.
We would like to uprate the silly little spun filter on each return line so we can filter what we can't remove to clean it up. Now I guess DUK won't warrenty any additional non std filter in the system but it's obvious the copper spun ones are no good for this job.
Throwing it out to the floor -what how why would you clean up a system like this
Multisync
London