NL11F Single-Stage

Brettbeck

New member
Hi everyone, i'm Brett (aka Brettbeck), you might have seen me around on a few other forums here and there. I'm from Sheffield, UK and i'm 16 (just left school). Anyway I thought i'd post up this build on here so....

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

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Started brazing the DSH coil on and a few other things here and there

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Condenser from the side

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Electrics need doing at some point

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Vacuumed the unit for about half an hour or so to make sure Alan's vac pump worked ok :)

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General view of the unit. You can also see we soft-soldered the captube on to the acumulator

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With case top on

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Front end

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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.
 
UPDATE: From 29th May :cool:.

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 :D.

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.

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Closer up picture of the units suctionline and evaporator frosting up.

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Evap itself :D.

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Running pressures for Dave :D.

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Insulated with red cable sleeving, red heatshrink and enclosure on the lineset.

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Something that we were both gobsmacked at was how quiet the compressor actually is :eek: ! 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 :).
 
Nice to see you here Brett!! :D

As I have said many times before, very nice work mate! :) V. nice work for a fellow 16 year old! ;). :D.

Keep it up ;) :B
 
Cheers Joe :D!

It's such a shame we don't live closer :(, we could use my single-stages and cascades on your hardware :D hehe.
 
name='K404' said:
16? I feel like such an underachiever!

Welcome to EP!

hehe brett is like a steam roller when he wants to learn something

he has sucked all the phase builder dry of info on his quest for phase knowledge:D

great to see ya work posted here in the UK brett well done mate:)
 
Indeed - I see a lot of purpose built units using a condensor that is much larger than that found on vapo and mach units - would you say this is the major contributor to handling larger load capacities?
 
name='OV3RCLOCK3R' said:
Wow! Just noticed this. Awesome work dude, Only a year youger aswell ! :)

Thanks :) !

name='maverik-sg1' said:
Indeed - I see a lot of purpose built units using a condensor that is much larger than that found on vapo and mach units - would you say this is the major contributor to handling larger load capacities?

Hi maverik,

I do think the slightly bigger condenser (3 rows over the vapo's 1) will help with the larger heat load. I would say that having a decent fan on the condenser helps too. When this unit was running idle for a bit the pipework before the condenser was warm and the pipe exiting was really cold, so it was obviously working effectively. When the load tester is made the results will be posted.... we will probably try upto the full 300W to see how well the unit holds it, although I think it will be tuned for maybe 250W or somewhere thereabouts.

Andrea (Dimas) actually says these 3 row condensers are suitable for handling up to either 1/2hp or 3/4hp systems.

I remember Gray saying somewhere that these slightly bigger condensers help with the increasing load too :).
 
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