[BaldLoonie]

Got one of those fine units. Had 475 head, 105 suction on 75° morning. Washed the condenser with foaming cleaner, it's clean. Took a smidge of R22 out. Ended with 325/78 superheat 26 subcool 35, return 80 supply 66.

There's little air coming out the top of this heap. At the top of the condenser there's a little air coming out the wrong way. See this sometimes with Bryant cube residential units. Rotation of motor is right, blade on right. I'm guessing too far down in the orifice but looks like factory and can't be raised.

Are these units known for this condenser air issues like this? Could there be something besides R22 in the thing? It's a bar, the bartender said "someone" was working on it before they called us.

 

[whec720]

Here is chart to figure your temp. split. Sounds like you are on the right track with the poor condenser airflow. Keep us posted.

http://www.wifocusonenergy.com/data/common/dmsFiles/R_HC_GUID_Airflow and Refrigerant Tables.pdf

 

[BaldLoonie]

Went up and played some more. Another rinse of the coil which helped some but big diff was raising the blade closer to the venturi ring/orifice. Really moving some hot air now. BUT, still 350 head, 60 suction, high subcool, high superheat. Cold freezone coming through the orifices into the evap but boils away rather quickly. Probably 12° drop. Now that we have condenser air, we are changing our tune. Being a dump of a bar, we wonder if someone might have though they were helping and dumped somethiing besides 22 in the beast. The stuff smells a little funky too

 

[makinmoney]

Is this a 2 coil set up? You may have to remove the top and split the coils...........

 

[whec720]

Wow, thats nearly a 5:1 compression ratio. Looks like you're not out of the woods yet. Is that funky smell the beginnings of a burn out? Whats the compressor amping?

 

[makinmoney]

High SH and SC, gives me the indication that your still having condensor issues. The longer you run with high head the more the oil begins to breakdown (gum up).

 

[BaldLoonie]

Not the condenser, can see through it, it is so clean. Water just pours through from the hose. Now we can take the door off and condenser air outlet doesn't change.

When 1st got there this AM, head was 475, suction 105. So that oil has been HOT. Comp was noisy with those pressures, removing a couple of pounds, washing the coil and repositioning the fan getting head down in the 300s, the comp is whisper quiet.

 

[whec720]

That compression ratio I gave you was with your improved head pressure. I was taught for AC, you shouldn't be over 4:1. Your oil is still too hot. At its present condition, the compressor will fail.

P.S. 475 psi!! Does this unit have a working HP switch?

 

[makinmoney]

When 1st got there this AM, head was 475, suction 105. So that oil has been HOT. Comp was noisy with those pressures, removing a couple of pounds, washing the coil and repositioning the fan getting head down in the 300s, the comp is whisper quiet.

Did you amp the comp before removing the refrig? What is the model number of the system?

Shoot me an e-mail it's in my profile.

 

[chadtech]

Sounds like possibly an overcharge and a restriction at the orfice, or liquid drier. Is it a TXV or cap. tubes? I would remove refrigerant and weigh how much is removed and then pull vacuum and weigh in the proper factory spec. refrigerant charge with new refrigerant.

 

[cobitech]

Orifice tubes are plugged up... seen this recently with the Precedent series.

disconnect evaporator blower and watch U-Bends. They should frost evenly.

You may have to change the evaporator coil if that is the case.

 

[Mstrav]

Got one of those fine units. Had 475 head, 105 suction on 75° morning. Washed the condenser with foaming cleaner, it's clean. Took a smidge of R22 out. Ended with 325/78 superheat 26 subcool 35, return 80 supply 66.

There's little air coming out the top of this heap.

I have installed many with few problems, they are well built. the problems are lack of maintenance and people who have no clue what they are doing changing parts and not installing them correctly, and as a bonus topping of the charge on every repair without having clean coils and filters.

matt

 

[gasnowman]

You may want to pull the charge.Verify the recovered charge amount verse factory weight. Remove the liquid drier and try to blow thru that under sized problematic drier . If it's not restricted .Try back flowing thru the evaportor with nitrogen and a clean rag on the inlet (liqiud feed) to catch any debree. Note that the liquid/suction line should be isolated so your checking the "low side and the individual orfices.This may require a good bit of pressure so you know gloves and glasses are a must. A properly sized drier should be installed. If you get time let us know what you find.

 

[daveydoo14]

any heat rejection from cond coil

if not and the cond is flooded i'd start pulling some refrigerant out take oil sample and evacuate the piss out of it

 

[BaldLoonie]

We've been replaced on the job. She called in someone else who said the only problem was a dirty evap (a bit but with 40° superheat, that wasn't the problem, we had great airflow) and open manual air damper. We saw that, probably letting in 5% outside air and being a smoky bar we thought it best to be open. I think why she is cooling the place is our work cleaning the condenser and raising the fan AND the fact that we've been out of the 90s with lower humidity. Not sure if we'll get any money out of her or not.

We did have the blower door off. Didn't frost but line out of each orifice was cold & wet.

 

[daveydoo14]

dont ya hate that

you didn't get to see the end result and you look like the a-hole