A few weeks ago Alan came down to mine and we built a small single-stage. I don't actually know any specs about the unit apart from it has Danfoss NL11F, 3 row condenser and an acumulator lol
Anyway here are some pics;
Getting some parts together
Started brazing the DSH coil on and a few other things here and there
Condenser from the side
Electrics need doing at some point
Vacuumed the unit for about half an hour or so to make sure Bill's vac pump worked ok
General view of the unit. You can also see we soft-soldered the captube on to the acumulator
With case top on
This unit is still far from finished but we will be working on it again soon. We still need to do the electrics, bolt everything to the base, screw the fan into the condenser, vacuum it out properly, insulate and some other things. We will update the thread as it is progressed
UPDATE: From 29th May
We had some problems with the electrics yesterday, so today we went to our local refrigeration supplier and got a new relay for the NL11F. The motor in the compressor now fires up perfectly
Also we were both told that all new compressors come bone dry
with no oil in. So, Alan filled the compressor with some proper POE oil and was then notified that the compressors do infact come pre-charged with oil. So last night at about 12am I went and choped the compressor out and drained the oil overnight.
At the refrigeration supplier today we got a nice 4.5litre jug of oil which I have been told can be used with any compressor and gas and works great, and so it does
Also went to BOC today and got Alan an oxygen bottle on rent for his brazing kit
Unit was charged at first with just 2.5bar static, which wasn't enough. We kept adding small shots and then the temperature plumeted to -49°c
. We were going to use Alan's new refrigeration scales to tell you guys exactly how many grams the unit took but it needed a new battery so it wasn't possible.
Closer up picture of the units suctionline and evaporator frosting up.
Running pressures for Dave
Insulated with red cable sleeving, red heatshrink and enclosure on the lineset.
Something that we were both gobsmacked at was how quiet the compressor actually is
! When we fired it up the only thing we could hear was the fan... we thought the compressor motor wasn't even running at first. Ran quite cool too, after about 30mins running it was just warm.
Alan has a 300W cartridge heater which we will use to load test and tune the unit sometime soon. Stay tuned for more results