Freezer vs Me, freezer winning

[smurphy]

Long story short, Reach in freezer. Compressor noisy, vibrating and overheating. Ordered new compressor, under warranty. Compressor less than a year old. Installed new compressor. New compressor overheating, and over amping. Heres some info.

Masterbilt m# blg-74hd
Compressor M# Katb-015e-cav
R-404a
Box temp 11 degrees
Suction line temp 55 degrees
Suction pressure 18 psi
Head pressure 260 degrees
Liquid line temp 100.5 degrees
Condenser inlet air temp 81 degrees
condenser outlet temp 98 degrees
discharge line temp 225 degrees
Compressor amps 13 amps
Sight Glass bubbling
Expansion valve metering device
No receiver

Also installed new Filter Dryer, Also cleaned condenser coil. When I took these readings. Thats when I found the compressor overamping, nameplate 9.6 rla. Also I understand that a system like this is critical charged. I weighted in the refrigerant, which is 50 oz. I've also tried adding and removing refrigerant, with no difference. I've also adjusted the expansion valve open and close, condition gets worst. The txv has been replaced before. Sporlan valve, no model found. It's acting like the condenser is undersized, but if that was the case my suction would be high. I'm stumped, what do you think???????

[A1 Burt]

How is the condensor fan moter turning fast enough is fan blade on right
some thing is maken your amp's hi :confused:

[jpsmith1cm]

Long story short, Reach in freezer. Compressor noisy, vibrating and overheating. Ordered new compressor, under warranty. Compressor less than a year old. Installed new compressor. New compressor overheating, and over amping. Heres some info.

Masterbilt m# blg-74hd
Compressor M# Katb-015e-cav
R-404a
Box temp 11 degrees
Suction line temp 55 degrees
Suction pressure 18 psi
Head pressure 260 degrees
Liquid line temp 100.5 degrees
Condenser inlet air temp 81 degrees
condenser outlet temp 98 degrees
discharge line temp 225 degrees
Compressor amps 13 amps
Sight Glass bubbling
Expansion valve metering device
No receiver

Also installed new Filter Dryer, Also cleaned condenser coil. When I took these readings. Thats when I found the compressor overamping, nameplate 9.6 rla. Also I understand that a system like this is critical charged. I weighted in the refrigerant, which is 50 oz. I've also tried adding and removing refrigerant, with no difference. I've also adjusted the expansion valve open and close, condition gets worst. The txv has been replaced before. Sporlan valve, no model found. It's acting like the condenser is undersized, but if that was the case my suction would be high. I'm stumped, what do you think???????

Is there a CPR? Is it set right?

[smurphy]

OEM Motors and blades, seems to be running full speed.
No CPR valve, Suction pressure is not high.

[codgy]

install cpr and adjust to nameplate rla on compressor. or install oem txv which was pressure limiting.

[pecmsg]

Personally I don’t like x-valves without receivers. With that stated:
x-valve systems are not a critical charge system. Clear the sight glass.
Read this
http://www.hvac-talk.com/vbb/showthread.php?t=182736

[Freezeking2000]

Maybe the wrong txv valve, thats the only thing that could overload the thing. I would get the Mfg to spec a txv for you if possible. I would think an AA port on my kit would lower the amps. Also do not worry about amps on those semi-herms to much. It is normal for them to run up to 20% over during pull down. I would let it get to 0 and see how it is. The overloads click out at 140% of FLA.

You must clear the glass.

[Dchappa21]

You have a 72*F superheat :eek: Thats why your discharge temp is so high I would install the oem TXV or a MOP valve with a reciever I have never had much luck using a TXV with out a reciever:eek:. Or install a CPR with a rec, but it u don't know what size valve was installed I would rip it out and put the right one in...

Also this pump tops out at about 17 psi.

[mk#1in03]

Did you replace start components with new compressor? Bad or incorrect run cap. could cause amperage problems.

[wannafreeze]

Are you sure you got the correct pump?If I am not mistaken,
This freezer gets a 2 HP lt, Op.envelop (-30)-(+10)F.
yours is a 1.5 HP extra lt, Op.envelop (-40)-(-20)F.

Also;
http://www.hvac-talk.com/vbb/showthread.php?t=157737

[smurphy]

Contacted Master-bilt this morning. Confirmed that this is the correct compressor for this box. Site said 2 hp also. But tech support read off same model as mine. Box temp down to 5 degrees this morning. Probably wrong valve, still can't read m# of valve installed. But someone had to add some piping for the valve thats installed. I will order correct valve today and let you know.

[r404a]

Did you replace start components with new compressor? Bad or incorrect run cap. could cause amperage problems.

smurphy

this is what I want to know also. do you have the right start components as well?

r4o4a

[smurphy]

Yes correct start components, replaced with compressor.

[wannafreeze]

I am sure you checked the voltage on the compressor terminals while it's running right?
I would make sure of it so no loose connection somewhere or bad relay contacts is dropping the available voltage to the compressor.
But it has to be checked while it's running.(I hope I am not insulting your experience by reminding it.)

[fitter33]

Pretty risky installing a new pump w/o knowing if the TXV is the correct size. It would be a shame if the new comp. got taken out because a valve was incorrect and flooding back.

[sumdumguy]

Maybe the wrong txv valve, thats the only thing that could overload the thing. I would get the Mfg to spec a txv for you if possible. I would think an AA port on my kit would lower the amps. Also do not worry about amps on those semi-herms to much. It is normal for them to run up to 20% over during pull down. I would let it get to 0 and see how it is. The overloads click out at 140% of FLA.

You must clear the glass.

it does sound like that txv is over feeding hense the vibration(probable cause:ref slugging pos flooded @ start & broke a rod or punched a hole in the piston). I would definitely get the oem txv. i bet some ome r/r that valve.

[sarpanch2001]

it does sound like that txv is over feeding hense the vibration(probable cause:ref slugging pos flooded @ start & broke a rod or punched a hole in the piston). I would definitely get the oem txv. i bet some ome r/r that valve.

72* superheat Sounds lot to me .check txv and Defrost clock for heaters. due to heater on durring freeze mode can raise your superheat

[condenseddave]

I think one can safely stop referring to it as "superheat" at that particular reading. It's just plain heat, then.:p

[smurphy]

update: Sorry took so long, I installed the oem expansion valve, weighted in charge, everything is right where it needs to be be.

[beachtech]

R-404a
Box temp 11 degrees
Suction line temp 55 degrees
Suction pressure 18 psi
Head pressure 260 degrees
Liquid line temp 100.5 degrees
Condenser inlet air temp 81 degrees
condenser outlet temp 98 degrees
discharge line temp 225 degrees
Compressor amps 13 amps
Sight Glass bubbling
Expansion valve metering device
No receiver
???????

my PT chart says @ 18psig R-404a should be -18°F and you telling me that you suction line temp is 55°F ? so that's 73°F of SH... am i looking at this right :confused:

sight glass aside, wouldn't you charge a TXV by subcooling :confused:

[freeeze43]

adjust txv to 10 deg. superheat and measure sub-cooling,add refrigerant as neccesary,start with the 30 deg. over ambient,after txv is set, the head press. will drop and youll probably show that you need to add some refrigerant,, .......