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  1. #14
    Join Date
    Oct 2011
    Location
    Chicagoland Area
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    4,853
    We have had numerous issues with the relays on the grasslins welding shut or stuck open ONLY on True freezers. From what I understand, it happens during the inrush of current on startup. The older True design had a Paragon timer. This is from memory, so forgive me if I'm wrong. When True first changed over to Grasslin, they were wired the same way. After having problems, I believe the factory installed a relay in the electrical compartment. The grasslin timer energizes a relay, and not the compressor directly. If you have a unit without a relay, I'd recommend the Paragon
    Officially, Down for the count

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  2. #15
    Join Date
    Sep 2007
    Posts
    75
    If it gets down to _20f .. you probably don't have a refrigeration problem , but rather a control probelem. Thermostat sticking, defrtost timer sticking, defrost termination sticking,loose wire, burnig (going bad ) overload on compressor, burning (going bad ) contact on timer. Afew things to check. You may have to baby sit it to catch it. I also do not like the Graslin. The Paragon ued to be "bulletproof" but I think that all of thagt stuff is foreign made now and the foreigners do not have "high quality " in their vocabulary.

  3. #16
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,071
    Quote Originally Posted by 2sac View Post
    We have had numerous issues with the relays on the grasslins welding shut or stuck open ONLY on True freezers. From what I understand, it happens during the inrush of current on startup. The older True design had a Paragon timer. This is from memory, so forgive me if I'm wrong. When True first changed over to Grasslin, they were wired the same way. After having problems, I believe the factory installed a relay in the electrical compartment. The grasslin timer energizes a relay, and not the compressor directly. If you have a unit without a relay, I'd recommend the Paragon
    Now I got ya, makes scene.

    I do the same to MR4 controllers. (install external relays)

    Good ole mechanical time clocks had nice contacts...these electronic time clocks have crappy relays.

  4. #17
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,335
    Im going with defrost termination switch , or t stat

  5. #18
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    683
    Make sure the self closing door hinges are working. Because something I've often seen is the customer gets in a hurry and the doors don't get shut all the way, this causes the evaporator fans to turn off, and they don't really notice until the box is already at 35*f, although this still doesn't really explain 80*F box temp.

    I agree like everybody else says, probably defrost termination switch is not terminating (or it is, and the timer solenoid or release relay has failed) causing it to stay in defrost for much longer than necessary until box gets so warm.

  6. #19
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,401
    Just a follow up. I did go and babysit the unit for a few hours and definatly air recirculation problem. Air into condenser getting up to 106 degrees after about two hours of operation and 74 degree ambient. Put a box fan near condenser and it works fine all day. I wonder whats going to happen when its 100+ this summer.

  7. #20
    Join Date
    Mar 2010
    Location
    Lindenhurst, NY
    Posts
    26

    Exclamation

    Is your compressor hot upon arrival? What happens when your unit goes into defrost?

  8. #21
    Join Date
    Sep 2011
    Location
    Augusta, ME
    Posts
    76
    Ya 106 degrees that could have somethingto to do with the compressor tripping on thermal haha

  9. #22
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,853
    I have mounted 115v coaxial fans on units to redirect discharge air, and have also wired condenser fans to run 24/7 to help cool the pump during the off cycle.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  10. #23
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,401
    Thanks for everybodys input.

  11. #24
    Join Date
    Oct 2009
    Location
    new jersey
    Posts
    256
    I see defrost termination problems usually snap in refrigeration before ice melts causing more ice. Chech pot relay maybe sometimes its not energizing start winding causing off on overload.

  12. #25
    Join Date
    Feb 2007
    Location
    Fremont, Indiana
    Posts
    1,755
    Quote Originally Posted by Snapperhead View Post
    Im going with defrost termination switch , or t stat

    Been changing enough t-stats on True's to ditto that.
    Last one I caught as I was packing up!
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  13. #26
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    683
    Quote Originally Posted by 2sac View Post
    We have had numerous issues with the relays on the grasslins welding shut or stuck open ONLY on True freezers. From what I understand, it happens during the inrush of current on startup. The older True design had a Paragon timer. This is from memory, so forgive me if I'm wrong. When True first changed over to Grasslin, they were wired the same way. After having problems, I believe the factory installed a relay in the electrical compartment. The grasslin timer energizes a relay, and not the compressor directly. If you have a unit without a relay, I'd recommend the Paragon
    Just wanted to say "Thanks!" for posting this! I saw it happen today. I knew exactly what it was because of your post.

    Here's how True freezers are wired when you retrofit a Grasslin clock where it used to have an 8141 Paragon: the thermostat / condensing unit is powered through the "F" Fan relay, which is a much smaller relay than the "4" relay (even though it says its a 30amp relay). The evap fans power comes from the door switch circuit, down to the clock, then through the "4" relay, which is the 40 amp relay. I watched the thing roll into defrost, heaters came on, but condensing unit ("F" relay) failed to open. So compressor was running through the entire defrost.

    Our solution was to install a cube relay so that the thermostat and defrost clock only energize the relay (just like how True does to address same issue), and after that it didn't hang up any more. Hopefully the relay isn't damaged, we just installed that Grasslin timer a couple of months ago...! We will find out.

    Makes me wonder whatever happened to the other freezers we've put Grasslin timers on without an external relay...

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