Danfoss NL11F inside pics !!

[Blaster]

Ok, to the ppl who never saw an hermetic compressor insides this will be an interesting thread, also to the NL11F users there will be usefull info.


Received a broken prommy some time ago to repair. Compressor was making strange noises.

So for looking at the picture below why is it broken?

Lets see who gets the correct answer heheheeh

(Walt, Detroit and ppl in trade are not allowed to play this game )

[star882]

Liquid refrigerant entered cylinder (due to underload), "hydrolocked" it, and snapped the connecting rod?
Lack of oil?
Excessive operating pressures?

[n00b 0f l337]

Becuase someone cut the top off it.

[Rockhammer]

heh, heh...I can see it now, the next big thing in modding...compressors with windows.

[MeltedDuron]

that would be awesome, but the extreme pressures, temperatures, and vibration in compressors would probably blow out most windows.

[trance565]

that would be awesome, but the extreme pressures, temperatures, and vibration in compressors would probably blow out most windows.

get teh right kina plexi glass, and your good xD

anyways, that silverish piping on top looks kina out of place?

[INJViper]

heh, heh...I can see it now, the next big thing in modding...compressors with windows.

Lol compressors with windows...

[aussie_guy00000]

Lol compressors with windows...

Nah, that'd never work, it'd constantly crash on you for no reason at all

[Brettbeck]

Is the problem visable on that picture? Or is it an internal problem?

Btw, is it that lump of metal that clunks against the sides when you move it around, or is it something inside that?

[Thrilla]

Pretty cool stuff lol, first time seeing a compressor's guts.

Does it have to do with that rectangular piece under the silver pipe, it doesn't look secured.

[Rockhammer]

heh, heh...I can see it now, the next big thing in modding...compressors with windows.

I was joking guys!

[Brettbeck]

Pretty cool stuff lol, first time seeing a compressor's guts.
look secured.

Me too . Must admit I didn't expect it to look anything like that...

[qdemn7]

Didn't even know what a compressor looked like inside. Can you even repair one?

[spastikman]

internal leak ?

[trance565]

Didn't even know what a compressor looked like inside. Can you even repair one?

i would assume so, but you need to know how to weld atleast in order to get the top back on.

[Blaster]

yes, of course it could be welded on if it was a minor repair, not the case here

---


Well congratz to Star882, he was right on the 1st answer.

Yes the connecting rod its snapped as you can see on the lowsy picture below. The connecting rod connects the piston to crankshaft just like in a car.
The piston and cylinder are also damaged.





This probably happened by liquid refrigerant entering the cylinder, this is what can happen when you see ice reaching the compressor and hearing "watter in hot fry pan" noises.

On the pic below, in white, you see the suction tube to the cylinder. It was the 1st time i saw a compressor with suction so close to port, this means this compressors are quite prone to damage if you let liquid refrigerant reach the compressor, if you use that suction port.




Also noticed that the cap tube on this mach2 ST was modded increasing it by 80cms, poor compressor really had a rough short life. Stock cap tube is 2,4mts, adding 80cms will make it 3,2mts
It must have had very high high side pressures for long periods of time which also lead to premature death. The cap increase might have lowered the no load temp but reduced dramatically the capacity and ppl trying to make it to hold load probably overcharged it so much that liquid refrigerant was reaching compressor ending on the compressor failure.

Some more pics

[|RickY|]

@ some time that cappilar mod are usualy, cpus now are to mutch hot.

[[XC] MarioMaster]

looks cool, thanks for sharing

[epion2985]

Nah, that'd never work, it'd constantly crash on you for no reason at all

ROFL

[johann]

I cant see how anyone could make a capillary tube 0.028 3.2m on a NL11f.

As blaster say, it will kill the compressor. Poor NL11F. I hope the poor owner did not pay to get his unit downgraded like that. He sure is paying now to get it repaired

[Unknown_road]

longer cap tube doesn't raise discharge pressure!

[DetroitAC]

longer cap tube doesn't raise discharge pressure!

Very good Unknown_road! Yup he's right, the system is a closed loop, if you restrict the low side by way of the expansion device, the mass flow will go down. Less mass flow = less capacity = lower discharge pressure

If it was then overcharged to try to compensate (increasing the subcooling), like Blaster guessed, then the discharge pressure could be just about anything, could be higher or lower depends on how much overcharge.

Excellent thread Blaster, very educational!

[|RickY|]

if that promy is portuguese, probably that mod was done by me or by an a/c tec @ some years.

my first mod on my mach1 was done by an a/c man on my city, making what the xtremesystems a/c "boss's" of that time have told-me, somthing like: add 0.8 or 1meter of cappilar and add r404a until it gets @ 1" off compressor

i'v gone with some friends and her promys to that guy, we test only r404a and the cappilar add, and it gets some degrees better with the extra cap, the cpu's load on that time aren't the same we use now.

that compressor must have some years of working

[ewitte]

Liquid refrigerant entered cylinder (due to underload), "hydrolocked" it, and snapped the connecting rod?
Lack of oil?
Excessive operating pressures?

YGPM

[johann]

longer cap tube doesn't raise discharge pressure!

LOL!