Author Topic: Vintage 1950's Hotpoint Relay/ overload  (Read 3135 times)

Offline PRM

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Vintage 1950's Hotpoint Relay/ overload
« on: February 14, 2012, 09:54:15 AM »

I am only able to cool my vintage Hotpoint Kegorator  about five degrees (see pic below I made this about a year ago).  After some research online I have pin pointed the problem to the relay.  The relay has a loose part in it that is noticed when shaking the relay.
So it looks like I am looking for a replacement relay for my 1950's (I do not know the model year that this piont) vintage hotpoint fridge


Specs on the frdige are:
Serial No. 0656521
Catalog No. 226EH12
1/5HP 3.3 AMP


The relay is made my Ranco with the following information stamped on it:
H-65-6516
LH2B4H1


See below for pics of the compressor and relay


At the recommendations of an antique repair shot I contacted the appliance repair clinic yesterday and they did not have the part but provided the following two part numbers from a microfiche
104983 and cross reference Part No. WR7X5005

Afters some online research I found that these numbers cross referance too the following parts:

Mars 21305
Supco R081
GEM IC15
Smart Relay SR015

Sorry for the long winded background....my questions are:

  • Am i on the correct track with these part numbers?
  • Will these replacements parts (have located a few for less them $30 a piece) be able to plug into the existing setup?
  • What caused these relays to go bad?  (i.e. is my compressor going bad)
Thanks in advance for your help....I love this fridge and it has been in the family since it was made in the 1950's and I hope to get it back in running shape ASAP!

Thanks again- Paul

Offline tgoods

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #1 on: February 14, 2012, 10:26:27 AM »
Does the compressor run?  It's normal for older relays to rattle when you shake them.  Test with an ohm meter.  The start and run terminals should have infinite ohms when right side up and 0 ohms when upside down.  Check your compressor terminals.  Top terminal is common, right is run, left is start.  Check from common to run, common to start and run to start.  Typically, the start winding has more resistance than the run winding.  The start to run winding measurement should equal both common measurements added together. Check all terminals to ground, should be infinite. Any of the generic relays should work.

Offline bigbuck

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #2 on: February 14, 2012, 10:29:32 AM »
 Man that's a nice refrigerator, anyone of those parts will work, you may have to wire it in though. Compressor terminals look good
 


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Offline PRM

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #3 on: February 18, 2012, 09:51:56 AM »
Ok i have done some more testing and here is an update:


I decided to use the existing relay and use my build in internal temp gauge to run a test.  Here is the results


Time (mins)    Internal Temp (degrees F)

Offline PRM

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #4 on: February 18, 2012, 09:55:22 AM »
Time (mins)    Internal Temp (degrees F)
0                         42.5           
20                        32.0
30                        29.7
40                         30.1
50                          33.3  and compressor no longer running


Any reason why after approx. 50 mins the compressor is no longer running.  I unplugged the fridge and after a few mins plugged it in and the compressor ran fine.


I also tested the resistance and it appears to be fine.  Again thanks for your help!

Online theoldstoveguy

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #5 on: February 18, 2012, 06:06:44 PM »
 Where are you reading the temperature? The fresh food @ 38 F is perfect. To check it put a thermometer in a glass of water. The old units ran 50/50 usually.

Offline PRM

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #6 on: February 19, 2012, 12:53:10 PM »
Yes i am reading the temperature using a probe that is inside the fridge.  I tested it again today and after about another hour the fridge temperature is no longer maintained (i.e. matches the outside temp).


What do you all think could cause the fridge to maintain cooling for about an hour at a time and then stop working?


Thanks!

Offline jumptrout51

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #7 on: February 19, 2012, 02:34:19 PM »
Check for 120 volts at the relay when it is off.
If no voltage check the cold control it may be sticking open.
Take a Kid fishing.

Offline PRM

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #8 on: February 20, 2012, 05:16:38 PM »
Been running the fridge for about a day now and only getting about 3 to 5 degrees cooling (around 45 degrees inside the fridge).  I have check the relay regularly and it always has 120 Volts.


What would be causing the compressor to run and not reach the full cooling power?


Again thanks everyone for your suggestions and time!

Offline jumptrout51

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #9 on: February 20, 2012, 06:35:38 PM »
Weak compressor and or low on refrigerant.
Take a Kid fishing.

Offline PRM

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #10 on: February 21, 2012, 08:33:53 AM »
How could I investigate if the compressor is weak or low on refrigerant?  I have a friend who owns his own HVAC business and I am planning on call him to see if he could help me. 


If I am low on refrigerant does that mean that I have a refrigerant leak?  Or does refrigerant run low over time (this unit has run for over 60+ years)?


Should I stick with  Freon-12 if a recharge is needed?


Thxs

Offline Tech2000

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #11 on: February 21, 2012, 02:16:36 PM »
Refrigerant never runs out or gets used up. It sounds to me that the compressor may be overheating and cutting out on internal overload until it cools down enough to start up again. To check pressures you would have to install a piercing valve on the suction line.

Offline PRM

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #12 on: February 21, 2012, 02:25:31 PM »
Tech2000
to make sure I follow.   I will be able to monitor the pressure by installing a piercing value on the suction line....what should an optimal pressure be?  If I do find the compressor is overheating....what can be done to fix the issue?


How hard and costly would it be to install an entirely new compressor?  Space might be somewhat of an issue...I will look into that tonight

Offline Tech2000

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #13 on: February 21, 2012, 03:03:59 PM »
Well if it doesn't have the pressure information on the rating plate, i would probably say the suction pressure should be around 10-15psig. If the compressor is overheating it could be the bearings inside of the motor or it could be due to low refrigerant. If it turns out you want to replace the compressor I would make sure you don't have a leak in the evap coil. I'm not really familiar with the design of this particular vintage unit, but these are things that we check on all refrigerators with a cooling problem.

Offline PRM

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Re: Vintage 1950's Hotpoint Relay/ overload
« Reply #14 on: February 21, 2012, 03:25:40 PM »
does checking for a leak in the coil just involve a close up visual inspection?  I believe the evaporator coil is within the fridge part unit behind the defrost plate (this unit was one of the first to have defrost I believe)....any ideas on how the cooling (or evaporator coil) would reach the freezer?

 

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