Compressor failed after a couple hours.....*gulp*

[pecmsg]

Possible

[TechmanTerry]

I believe that is a low side connection, The hi press port in at 12:00 as viewed from the oil pump end of the comp. That is where the other flexible line on the oil press control connects to the comp head. I wondered the same thing. I also thought about the Schrader fitting at the oil return line into the comp crankcase, is there an insert in there?

[WT70]

Looks like a tee at the crankcase where the oil feeds back in.


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[TechmanTerry]

Looks like a tee at the crankcase where the oil feeds back in.


Sent from my KB2007 using Tapatalk

I'm thinking maybe an insert in the "run" connection, not the bull fitting.

[Out in the cold]

Thats a low pressure access point for an MR compressor. It listed in copeland AE bulletin AE4-1094 R7. I'd post a pic but either I can't figure out how or am not able to.

[WT70]

Ok. I am going to stick, for the moment, with my idea of floodback washing out the oil.

Copeland states:

"What is the recommended super heat of Copeland compressors?

To insure proper compressor cooling and lubrication the minimum operating compressor superheat is 20 ˚F"


MINIMUM superheat.

You have 20deg superheat with a 30' lineset run. When coming out of defrost there is a possibility of flooding on pull down.

30-40deg superheat on a freezer at the compressor is still a 30deg suction line, plenty cool for the compressor.



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[primmers]

It’s a low side...

[primmers]

I’m at a loss....ILl finish another job tomorrow and I will take the bottom
Of the oil separator off and see it the oil is in there.. either way I have a failed
System, and I need to find out why the oil didn’t return..and the oil safety didn’t do its job.

[rkious]

Most first warranties are a given. The only first time fails I have seen a first time warranty rejected by Emerson was a three phase compressor that had been single phased. A second time fail will be put under a microscope and good luck getting a third time one under warranty.

[primmers]

My supplier told me not to replace the compressor, he suggested I install a whole new walk-in and
Condensing unit..told me the owner got his money’s worth out of this system..
So when I went and bought the compressor, he didn’t like it..and I’m sure I’ll hear about it...again.

I don’t want to put another compressor in...not until and unless I know what the frick happend
To this one..If the oil is in the separator, I will remove it and install a warranty compressor..if they will give me one..

[primmers]

Update...today Source showed up to evaluate the system because the compressor wouldn’t start
They couldn’t do a complete evaluation, but said the separator is the likely cause..it’s not a factory install.
I have to figure out how to tell my supplier, if the separator failed why would they replace the c0mpressor?/
But the safety didn’t do its job as well...

[pecmsg]

Double failure is rare but can happen.

Check and recheck.

[primmers]

If the separator doesn’t have the oil, what would cause the oil to be in the evap or c0ndensor?..I’ll be taking
It apart tomorrow..just trying to get my ducks in a row for my supplier..he did n
t want me to do a c0mpressor..

[pecmsg]

If the separator doesn’t have the oil, what would cause the oil to be in the evap or c0ndensor?..I’ll be taking
It apart tomorrow..just trying to get my ducks in a row for my supplier..he did n
t want me to do a c0mpressor..

Oil pressure safety is easy
Hook N2 to the control. Set for 9# ‘s drop to 8 and wait.

[primmers]

There’s no oil in the sight glass..pretty sure it’s gone

[primmers]

Www I just noted something...the new oil switch is a PENN N45NCB..I asked for
A JOHNSON P45NCA...I’m thinking the alarm is the only difference......

Didn’t use the brown wire

[VTP99]

Wouldn't it be a P45 ?

[primmers]

My bad, it’s a
P

[primmers]

I hate to keep bringing new things to this conversation, but someone mentioned the service valve on the separator
Needing to be “cracked”..this valve was 99.98% back seated..
I noticed this today

[primmers]

Looking at the photo the oil separator appears to be a Temprite 500 series accessible impingement type, probably a model 504 (1⅛") or 505 (1⅜") depending on the connection size. The 500 separator has impingement screens which collect the oil mist, allowing the droplets of oil to fall to the bottom of the separator where it's fed back to the compressor through a float valve.

https://temprite.com/products/conven...rs/500-series/





















Attachment 823467

It appears to be a replacement by the 1⅛" x 5/8" reducing fitting and at first look it appears to be way oversized as it was customary to select a separator according to the discharge line size, however Hussmann as the OEM would tend to specify an oversized separator with custom connections corresponding to the discharge line size.

The missing oil from the compressor sump has to be either in the oil separator or the evaporator. My suspicion is that it's in the separator as a result of a stuck float or blocked line. The OP did say he blew out the return line but there may well be debris (crap) lodged in the float valve.

Of course it possible that it's in the evaporator even though it's located above the compressor the original suction line sized for low temp R12 could be too big for proper oil return with R404A. We would need to have the suction line size at the evaporator to the estimate proper line size for R404A.

Here’s the instructions, no mention of the service valve, which was back seated, and I didn’t add any oil..

https://temprite.com/downloads/500_Install.pdf