Results 1 to 6 of 6

Thread: 1937 kelvinator ice cream cabinet charge pressure?

  1. #1
    Join Date
    Sep 2018
    Location
    Texas
    Posts
    3

    Default 1937 kelvinator ice cream cabinet charge pressure?

    I have a 1937 kelvinator ice cream dipping cabinet.
    It seems to be low on Freon. Does anyone know what pressure to charge it to?
    Attached Thumbnails Attached Thumbnails 4BF0060A-FCA7-4B47-BA28-3B25B4921EFD.jpg   446CAEF7-30A9-4237-9248-778168898889.jpg   D83EFD17-5C33-4A69-96C2-664A64D48995.jpg   D31B054E-AEB1-4FC3-BBAB-78609C120826.jpg  

  2. #2
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    30,569

    Default

    It depends on the temperature. Use a refrigerant temperature/pressure chart and charge it by head pressure. That system uses a pound of R-12. Don't use R134a refrigerant. Don’t cure the symptom and leave the cause. Recharging a refrigeration system may correct the condition of insufficient cooling, but it does not correct the original problem unless a cause is found. A properly working system does not lose refrigerant over time.
    Click image for larger version. 

Name:	temp pressure.jpg 
Views:	4 
Size:	179.3 KB 
ID:	39610
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  3. #3
    Join Date
    Sep 2018
    Location
    Texas
    Posts
    3

    Default

    Thanks for the reply. I realize that there should not be a leak.
    I really don't know anything about refrigeration and don't understand what temperature is referred to in the chart.
    I have a friend who works on car a/c systems but he is not sure what to charge the unit to.
    A home a/c guy put a gauge on the compressor the other day and read 35psi but he also wasn't sure what it should be.
    I guess that no refrigerant should leak down even after 81 years?

  4. #4
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    30,569

    Default

    Quote Originally Posted by Orvilsoft View Post
    A home a/c guy put a gauge on the compressor the other day and read 35psi
    Hmm....that's not good. If the compressor is running at 35 psi on the low side that would indicate the compressor is not pumping (bad). The head pressure is the high side pressure/temp relationship. The first column on the left side of the chart is the temperatures. All the columns to the right of the temps are the different types of refrigerant. Find the ambient temperature on the left side of the chart (or in the center of the high side gauge). Then move to the right until you get to the R12 column. Charge the high side to the correct pressure then you'll know what the low side should be. Probably somewhere around 2-5 psi. Here's the deal; Automotive AC and central AC units are different animals and very forgiving where 5-10 psi is no big deal. On domestic refrigeration 1-2 psi can be the difference between cooling and not cooling.


    Quote Originally Posted by Orvilsoft View Post
    I guess that no refrigerant should leak down even after 81 years?
    Refrigerant doesn't evaporate or break down and it's in a sealed system so the answer would be no.
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  5. #5
    Join Date
    Sep 2018
    Location
    Texas
    Posts
    3

    Default

    Well, thermostat is dead. Relay works but the overload constantly cycles.
    Static pressure at 40. Compressor won't run long enough to build high and low pressures.
    Needles start to move on gauges. Current rating on tag shows 3.3 amps. Compressor
    drawing 8 amps at startup. Guess that's what is tripping the overload. The overload is a flat
    piece of copper that bends and breaks a contact. I'll be checking where the wires go to
    the compressor for any short this weekend. Is an old compressor like this salvageable?

  6. #6
    Join Date
    Jul 2006
    Location
    Murray, Utah 84107, United States
    Posts
    30,569

    Default

    Quote Originally Posted by Orvilsoft View Post
    Is an old compressor like this salvageable?
    Not if it's bad.

    Quote Originally Posted by Orvilsoft View Post
    The overload is a flat piece of copper that bends and breaks a contact.
    That sounds like a hotwire relay
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 31 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

Similar Threads

  1. 632 Sub Zero refrigerator charge question. Did I overcharge?
    By ed_500 in forum Refrigerators & Freezers
    Replies: 1
    Last Post: June 13th, 2018, 09:00 PM
  2. Freon charge
    By tmol in forum KitchenAid
    Replies: 3
    Last Post: July 16th, 2016, 05:49 AM
  3. Simply charge SubZero 561 or search and repair?
    By BTF in forum Refrigerators & Freezers
    Replies: 5
    Last Post: November 22nd, 2008, 02:54 PM
  4. Glenwood 1937 gas range
    By MichaelNY in forum Antique and Retro Appliance Chat
    Replies: 1
    Last Post: April 3rd, 2007, 06:07 AM
  5. Freezer/Ice Cream
    By spreadb in forum Sears Kenmore
    Replies: 2
    Last Post: March 21st, 2007, 11:30 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
If you feel that you have benefited from this site, and would like to show your appreciation, you can throw a buck or two in the Appliance Blog Tip Jar - Thank you!