1. Professional Member
Join Date
Jan 2005
Location
Veterans Home Yaphank, NY
Posts
2,311

## Hussman Puzzler ?

One of my students called me and said he is working on a two door upright Hussman Reach-in Freezer. Self Contained in a convince store
Customer said box will not keep ice cream. He checked it-out.
1.Box running at 20F
2.Condenser Clean
3.pressures high side 275# low side 17# R404A
Compressor KAB 0150 CAB
Model Number of freezer removed as unit bought at auction.
Everything sounds good to me, only thing I can think of is inefficient compressor.

2. Regular Guest
Join Date
Jul 2007
Location
Chino, CA
Posts
39
maybe liquid drier or txv is plugged? does the txv have the right charge or big enough? the high side seems a kind of high though, 275# = 111 degrees r404a on a self contained (indoors probobaly 75-80 degrees) condensing temp should be 90-95 degrees = 200-215# r404a?

3. Professional Member
Join Date
Jan 2005
Location
Veterans Home Yaphank, NY
Posts
2,311
Originally Posted by gban
maybe liquid drier or txv is plugged? does the txv have the right charge or big enough? the high side seems a kind of high though, 275# = 111 degrees r404a on a self contained (indoors probobaly 75-80 degrees) condensing temp should be 90-95 degrees = 200-215# r404a?
Old school rule of thumb. High side pressure= Ambient temperature+30
Ambient 75F + 30 = 105=250# 80 + 30 +110=266#
resriction (drier,TXV) suction = low#

4. Regular Guest
Join Date
Jul 2007
Location
Chino, CA
Posts
39
hmmm, i thought it was only ambient + 15

5. Originally Posted by icehouse
One of my students called me and said he is working on a two door upright Hussman Reach-in Freezer. Self Contained in a convince store
Customer said box will not keep ice cream. He checked it-out.
1.Box running at 20F
2.Condenser Clean
3.pressures high side 275# low side 17# R404A
Compressor KAB 0150 CAB
Model Number of freezer removed as unit bought at auction.
Everything sounds good to me, only thing I can think of is inefficient compressor.
Are you kidding me. Your a teacher?

What was the superheat? What was the delta T across condenser? What
kind of metering device? I mean give me a darn break here. This is a joke right?

6. Professional Member
Join Date
Jul 2005
Location
FLORIDA
Posts
1,162
have him get comp # and or condensing unit #

sounds over charged

pull and weigh in charge if he can find the # or call true
they can give him an idea on the charge amount

cap tube system or txv

7. Professional Member
Join Date
Jul 2005
Location
FLORIDA
Posts
1,162
down boy down

8. i have to admit I am surprised at the small amount of info given by a teacher.

I also think that 17# lowside is too low since you are at a 20 deg box.

sounds like a restriction to me or an improperly set txv. even if the valve is a C charge it will pull down to a 0 temp

9. Regular Guest
Join Date
Mar 2007
Location
Las Vegas, NV
Posts
48
Originally Posted by icehouse
One of my students called me and said he is working on a two door upright Hussman Reach-in Freezer. Self Contained in a convince store
Customer said box will not keep ice cream. He checked it-out.
1.Box running at 20F
2.Condenser Clean
3.pressures high side 275# low side 17# R404A
Compressor KAB 0150 CAB
Model Number of freezer removed as unit bought at auction.
Everything sounds good to me, only thing I can think of is inefficient compressor.

Inefficient compressor wouldn't give you those pressures....you need to know superheat and subcooling....if you have low pressure and low superheat it means one thing, low pressure high superheat means something else. Without SH and SC, you are just guessing. I cannot believe how many "techs" have been the trade for 5+ years and don't know what SH and SC are. Make sure you are teaching your students that when they hook up their gauges they also clamp on their pipe temperature probes. For me, it's second nature now.

10. How's the airflow inside the case?
Evap fans OK?
not iced up?

11. Regular Guest
Join Date
Feb 2007
Posts
13
ummm, what are the heater amps while freezing?
Just a thought

12. Professional Member
Join Date
Jan 2005
Location
Veterans Home Yaphank, NY
Posts
2,311
Are you kidding me. Your a teacher?

What was the superheat? What was the delta T across condenser? What
kind of metering device? I mean give me a darn break here. This is a joke right?
You are too smart. I asked here to show what type of "Mechanics" are out there. This student is in a journeyman's class, Been in the field fifteen years. These are the types of questions that are presented, and when asked about "Superheat and Subcooling", Amperage Draw, they look at me like I am nuts.

13. Professional Member
Join Date
Jan 2005
Location
Veterans Home Yaphank, NY
Posts
2,311
Originally Posted by dirtyboy103us
have him get comp # and or condensing unit #

sounds over charged

pull and weigh in charge if he can find the # or call true
they can give him an idea on the charge amount

cap tube system or txv
Reread the post. Compressor model was given. And why call True it's a Hussman.
The assumption given was that of the technician. When I asked for Superheat, Sub Cooling, Amperage Draw, there was dead silence on his part.
I told him to get ALL the proper information.

Page 1 of 2 12 Last

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•