r22 reach in freezer
TC
It was a r12 unit that someone else switched over to r22. It has a rebiult
semi-hermetic compressor on it. It is very noisy.
The problem is the cooling cycle. I got called out 3 days ago because it
wasn't working. I pulled the compressor out on the slide on the bottom and
it was out in internal overload. I tried the ice bag trick to coolit, but
after an hour, it stlii wouldn't restart. I shut it down and came back the
next day.
The next day it started fine, but the suction was in a vaccum after a few
minutes and the head wa about 150 or so. Low charge. I added r22 but never
could get the suction out of a vaccum. I valved off the condenser discharge
and watched the sight glass downstream for a couplo of minutes and put my
second set of guages on the fitting next to the glass. The pressure never
dropped and the glass did not clear. OK, bad ezp valve.
Ireplaced the valve and nitrogen pruged the lines. I weighed in 3 lbs, 8 oz
of r22, the nameplate said 4 lbs, 2 oz of r12. I added enough r22 to clear
the sight glass. Ran fine. I was going to wait until the box got closer to
the 10 degree set point bufore checking and setting superheat on the new
valve. after the temp in the box dropped to about 36 degrees, i started
taking the tools out to the truck. When I came back in, the suction was in a
vaccum and the discharge was about 150 again. What am I missing? The
evaporator fans came on like they were supposed to when the lines cooled
down enough. Please help.
Marc Morency
"TC" <no...@yahoo.com> wrote in message
news:9vcno4$api$1...@nntp9.atl.mindspring.net...
> I've got a Hussman reach-in freezer that is giving me trouble.
> It was a r12 unit that someone else switched over to r22. It has a rebiult
> semi-hermetic compressor on it. It is very noisy.
>
> The problem is the cooling cycle. I got called out 3 days ago because it
> vaccum and the discharge was about 150 again. What am I missing? The
> evaporator fans came on like they were supposed to when the lines cooled
> down enough. Please help.
>
Moisture? Is this an R22 compressor or an R12 compressor? Do you have a ZP
expansion valve or a CPR?
Rich
How long has this been running and was there problems before?
What is the compressor model?
What oil is in the system?
Is the compressor rated for r-22?
Is it a cap tube system?
If txv, is it an R-22 or an R-12 rated valve?
It surprises me that it was converted from 12 to 22. Unless the compressor
and metering device was changed I think you will always have major problems.
Even if they were changed out I would bet the condenser struggles to keep
up.
I would check the items above out and also call Hussman. Check with Copeland
and find out what the compressor is capable of.
Rich
"TC" <no...@yahoo.com> wrote in message
news:9vcno4$api$1...@nntp9.atl.mindspring.net...
TC
"Marc Morency" <hva...@mediaone.net> wrote in message
news:l6mS7.16579$5W5.6...@typhoon.ne.mediaone.net...
pulled a vacuum down to ???, purged with nitrogen, then evacuated it again.
I forget the numbers.
I don't know what refrigerant the compressor was designed for, but it does
have a r22 expansion valve on it and no crankcase pressure regulator near
the compressor. I'll have to check the back and top of the unit.
I really dislike bottom condenser reach-ins. The coils stay nasty and
dirty, no matter what you do to them. I won't even buy a new refrigerator
for my house because most all the new ones have the condenser coils on the
bottom...
TC
"Rich" <Now...@here.com> wrote in message
news:PDmS7.14927$_Y6.9...@news2.news.adelphia.net...
> How old is the compressor?
No idea. I have had this account for 2 years and never had to touch this
reach in except to clean the condenser coils.
>
> How long has this been running and was there problems before?
See above
>
> What is the compressor model?
It is a copeland rebuild, mobel (I think) KALB-0150-???
>
> What oil is in the system?
No idea, but good point. Since they replaced the TXV, and the origional
refrigerant was a mineral oil, I'd guess they stayed with mineral oil.
>
> Is the compressor rated for r-22?
No idea. I'll have to check that one out also.
>
> Is it a cap tube system?
TXV, as stated in the origonal post.
>
> If txv, is it an R-22 or an R-12 rated valve?
Old TXV was r22 as well as the one I put in. A Sporlan kit unit. R22 Power
element head, the body, and a 1.5 ton cartridge, all oiled and assembled as
per Sporlan's directions.
>
> It surprises me that it was converted from 12 to 22. Unless the compressor
> and metering device was changed I think you will always have major
problems.
> Even if they were changed out I would bet the condenser struggles to keep
> up.
I have to agree with you there about the condenser keeping up.
>
> I would check the items above out and also call Hussman. Check with
Copeland
> and find out what the compressor is capable of.
Is Hussman still in business for this kind of refrigerator?
> Rich
Thanks for the help.
ftwhd
>
>"Rich" <Now...@here.com> wrote in message
>news:PDmS7.14927$_Y6.9...@news2.news.adelphia.net...
>> How old is the compressor?
>
>No idea. I have had this account for 2 years and never had to touch this
>reach in except to clean the condenser coils.
>>
>> How long has this been running and was there problems before?
>
>See above
>>
>> What is the compressor model?
>
>It is a copeland rebuild, mobel (I think) KALB-0150-???
>
>>
Isnt a KALB a r 12 comp?
bill
<ftwhd@fuckoffspammerscom> wrote:
Yes or R-502 It's also crossed to a newer model for R-12
HvacTech2
Hi ftwhd, hope you are having a nice day
On 15-Dec-01 At About 03:00:04, ftwhd wrote to All
Subject: Re: r22 reach in freezer
f> From: ftwhd <ftwhd@fuckoffspammerscom>
f> On Sat, 15 Dec 2001 19:59:51 -0500, "TC" <NOS...@yahoo.com> wrote:
f> > > "Rich" <Now...@here.com> wrote in message
f> > news:PDmS7.14927$_Y6.9...@news2.news.adelphia.net...
>>> How old is the compressor? No idea. I have had this account for 2
f> > > years and never had to
f> touch this > reach in except to clean the condenser coils. >>
>>> How long has this been running and was there problems before?
>>> What is the compressor model? It is a copeland rebuild, mobel (I
f> > > think) KALB-0150-??? > >>
f> Isnt a KALB a r 12 comp?
I am not sure but a 1.5 compressor for a 1.5 txv?? I think not, not on a
freezer
-=> HvacTech2 <=-
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HVACMD
"ftwhd" <ftwhd@fuckoffspammerscom> wrote in message
news:2bco1uc3bkcfmvcb1...@4ax.com...
sure someone here could give you the specifics. I would have converted it to
408a or 507 and put a 502ZP valve back in it
Roger Sorrentino
conditions. The valve plate design will strongly influence the capacity for
this compressor that has a free-air cfh of 313. In checking similar
compressors (without regard to valve design) the capacity should be between
4000 and 6000 BTU/H -- similar to the original R-12 rating (at 0 degF
Suction and 110 Condensing.of 6000 BTU ) . The motor may have too low a
horsepower rating (it should be 2 hp), but it should be ok at freezer temps.
The problem with the sudden fall off in suction and discharge is
probably related to the expansion valve, not the compressor however. This
is not necessarily a bad valve (which is significantly oversized) and might
be sticking as it will be running nearly closed. It sounds like a moisture
problem, but could also be wax/parafin related, and this is the correct
temperature range for flocking with R-22 and mineral oil to be of concern.
Normally an R-22 freezer should use Zerol (synthetic) oil to avoid this
problem -- my recommendation is
A.) an evacuation with Micron gauge to 50 microns or so, change the oil to
Zerol and replace the drier. The expansion valve is pretty oversized, so it
should also be replaced, but it may be serviceable as is.
B.) convert back to an R-12 mineral oil compatible replacement blend that is
popular in your area or with your company, also with a good evacuation,
drier change and TXV change.
"HVACMD" <hva...@mediaone.net> wrote in message
news:YD9T7.20000$5W5.8...@typhoon.ne.mediaone.net...
HVACMD
"Roger Sorrentino" <roge...@hotmail.com> wrote in message
news:8ApT7.16523$MM5.1219825@rwcrnsc53...
Maybe I'm reading this response wrong, but this is a low temp 502
compressor. You suggest he change it to an R12 compatible blend?
Marc O'Brien
Typo!
Hope this helps,
Marc
Marc O'Brien
AUSTIN1880
I thought that compressor was medium 12 , low 502 ? If so, I would use 408 and
ditch that 22 valve for a 1/2 hp 502 valve.
Ed
TC
The compressor is rated for r22, per Copeland, BTU's are at 5150, opposed to
5900 when used with r12. The compressor is a high temp r12 or a low temp
r502 but will use r22 for low temp.
The reccomendations given to me were either leave it as a r22 unit, change
the oil to make sure it is mineral oil and install another r22 TXV that has
external equalization (HFE 1/2 HC) and recharge or change the oil and go
with a r502 TXV with external equalization (HFE 1/2 RZ) and recharge.
A new compressor is suggested also, but stay with the same size.
Since I'm not paying, it's up to the customer.
Thanks for all the help.
By the way, the refrigeration guy was amazed that the box had ran as long as
it has with r22 with the internal equalization TXV on it.
TC