Cold storage room evaporating coolers
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  1. #1
    Join Date
    Nov 2012
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    Cold storage room evaporating coolers

    I am in the process of *designing a cold storage room, where should I provide the disconnect switch for the evaporating coolers (2 nos) and lighting fixtures. Should it be inside the cold storage room or outside.*

  2. #2
    Join Date
    Jan 2004
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    Lancaster PA
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    Moved to Refrigeration and ice making forum.
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  3. #3
    Join Date
    Sep 2004
    Location
    Phoenix, Arizona
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    88
    It can be inside or outside box. Evap coils will need a means of disconnect in any case for code. So a tech can work on unit while the power is turned off.

  4. #4
    Join Date
    Nov 2012
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    15
    My concern was, that DS put inside should not get effected with the moist environment inside. So no issues I suppose, one should go for weather proof ones I guess. Thanks anyway.

  5. #5
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    Oct 2011
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    Chicagoland Area
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    Weatherproof are fine. Seperate disconnects for each coil and a seperate one for lighting.
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  6. #6
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    Nov 2012
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    Thanks 2sak

  7. #7
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    Jun 2009
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    DFW, TX
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    Actually, we have had a restaurant with this same setup and end up having an issue. Here's the scenario: Walk-in-cooler, two evaporators, each with a disconnect, but only one evaporator has the thermostat. So anytime they do inventory, they want to turn off the fans, but only on that side of the cooler. So when they turn off the slave evaporator, the refrigerant still flows through it since the solenoid is powered through the master evaporator. And naturally, they forget to turn the coil back on, until half a day later, and by then the thing is frozen solid. (Yes this has happened more than once.)

    One solution would be to use a dual pole switch on the slave evaporator, and run the thermostat wire all the way from the master to the slave evaporator, (in series) through the 2nd pole of the switch, then back to the master, so that no matter which switch gets turned off, it will kill the solenoid. I'm sure there is probably a prettier solution too but I can't think of what it is...

    (...well of course a single disconnect would solve this problem too, not sure if that is some electrical code or whatnot.)

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    Quote Originally Posted by trippintl0 View Post
    Actually, we have had a restaurant with this same setup and end up having an issue. Here's the scenario: Walk-in-cooler, two evaporators, each with a disconnect, but only one evaporator has the thermostat. So anytime they do inventory, they want to turn off the fans, but only on that side of the cooler. So when they turn off the slave evaporator, the refrigerant still flows through it since the solenoid is powered through the master evaporator. And naturally, they forget to turn the coil back on, until half a day later, and by then the thing is frozen solid. (Yes this has happened more than once.)

    One solution would be to use a dual pole switch on the slave evaporator, and run the thermostat wire all the way from the master to the slave evaporator, (in series) through the 2nd pole of the switch, then back to the master, so that no matter which switch gets turned off, it will kill the solenoid. I'm sure there is probably a prettier solution too but I can't think of what it is...

    (...well of course a single disconnect would solve this problem too, not sure if that is some electrical code or whatnot.)

    Or just add a contactor for the solenoid that the coil is powered from the same circuit as the fans. Run the stat wires through the contacts of the contactor. Then when they kill power to the fans, the solenoid closes.
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  9. #9
    Join Date
    Mar 2009
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    Mid-Mo
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    3,589
    Quote Originally Posted by trippintl0 View Post
    Actually, we have had a restaurant with this same setup and end up having an issue. Here's the scenario: Walk-in-cooler, two evaporators, each with a disconnect, but only one evaporator has the thermostat. So anytime they do inventory, they want to turn off the fans, but only on that side of the cooler. So when they turn off the slave evaporator, the refrigerant still flows through it since the solenoid is powered through the master evaporator. And naturally, they forget to turn the coil back on, until half a day later, and by then the thing is frozen solid. (Yes this has happened more than once.)

    One solution would be to use a dual pole switch on the slave evaporator, and run the thermostat wire all the way from the master to the slave evaporator, (in series) through the 2nd pole of the switch, then back to the master, so that no matter which switch gets turned off, it will kill the solenoid. I'm sure there is probably a prettier solution too but I can't think of what it is...

    (...well of course a single disconnect would solve this problem too, not sure if that is some electrical code or whatnot.)
    I think the answer is they need to man up and put a coat, hat, and gloves on like the rest of us do!

  10. #10
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    640
    That's exactly what they do now, since I bypassed both of the switches!! Either that or they turn off they single circuit breaker that shuts off both evaporators

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