schenimann ;

The Information submitted so far by the other Members should be what you need.

I would like to add a few things to the list of data:

If the Cold Box is a "Freezer" - having a Target Nominal Design Temperature of 32ºF (0ºC) and lower, figure these following Design Specifications:

  1. Use XHHW type Insulation inside the Cold Box, for the Conductors,
  2. For any Low Voltage Cables (Temp. Sensors, Relative humidity Sensors, Freon Sensors), the Cable Jacket + Conductors should be suitable for Ambient Temps below 40ºF. Something equal to "FREP",
  3. If you use Fluorescent Strip Fixtures, GVA makes a nice sealed, gasketed surface mounted unit, designed for low temperature installations.
    For best performance, use 4' T5HO (F54T5HO) and Programmed-Start Ballasts,
  4. The Man Doors _SHOULD_ include Door Heat (Heat Trace Cable), which is pre-installed by the Manufacturer.
    Typically, Man Door Heaters are 400 VA @ 120VAC, and use Self regulating Heat Trace.
    This would be common Specs for a typical 3'-6" to 4'-0" Man Door.
    Heat Trace terminations will be made on the "Ambient" side of the Door, on the upper corner of the Door Trim, opposite side of the Door's Latching (Hinged Side).
    Typical connections are terminated in a Single Gang Bellbox,
  5. To Seal Off the Penetrations, fill at least 12" of whatever Conduit is entering the Box with dense foam sealant.
    Seal the Penetration through the Insulated Panels as well.
    (I have Seal-Off detail Drawings; let me know if you would like a copy for reference),
  6. I typically Specify NEMA 4X Enclosures in Coolers and Freezers, but NEMA 3R will work as well,
  7. The Evaporator(s) will require at least One Disconnect Switch mounted on or near the Evaporator Unit.
    These may be Non-Fusible EXOs.
    Need One Disconnect for the Evap. Fans, and One for any Electric Defrost Heater Arrays.
    Use NEMA 3R or 4/4X Rated Enclosures,
  8. Drop into each Disconnect with Sealtite (LFMC).
    We drop into the Cold Box at each Disconnect location, from a Seal-Off / Jbox Assembly mounted on the Ambient side of the Lid (Ceiling),
  9. For Defrost Terminations & Fan Delays, drop into the Evaporators as is done for the Fan / Defrost Heaters whips,
  10. If the Liquid Solenoids are external, these will be mounted above the Hard Lid. Connect a pair of #14s per LSV, and run back to the C.U.
  11. Drain Line Heaters: These are typically wrapped with 6 VA per Foot Heat Trace Cable, using a Ratio between 1.41 and 3 Wraps per Linear Foot.
    Typical Drain Line allotments would be 600VA per Evaporator, unless tighter wrap ratios are requested,
  12. Place the Lighting Switches outside of the Cold Box - at the Man Doors, unless Project Specifications require the Switches to be inside the Box.


Mostly the same will apply for Coolers. Drain Line Heat and Door Heat will likely not be used in Coolers; Defrost might likely be Air Defrost (no Electric Heaters or Hot Gas Defrost).

Conductor Insulation may be THHN if Design Temperature is >+36ºF

As for the Condensing Unit(s), the Evaporators will likely be driven from the C.U., so this is where you will pick up the Branch Circuitry for Evaporator Fans and Defrost Heaters.

Freon, Humidity and Temperature Sensors, along with the Defrost Terminations / Fan Delays, will Terminate to Control T-Blocks at the C.U. - unless separate Control Panels / Equipment is used with the Sensor Systems.
A typical example would be Temperature Sensors controlling LSVs via a Johnson A419 Controller.

There are a few other things to mention, but I will stop here.

*** IMPORTANT NOTE ***

Verify all Installation Data against the Project's Specifications - Electrical Plans, Cutsheets, Vendor Specific notes, Ref. Contractor's Specifications, Manufacturer's Data and Specifications, as well as the Project Manual.
Verify installation notes per each "Section" of the Plan Set - i.e.: "A" Sheets, "R" Sheets, "M" Sheets, "P" Sheets, "S" Sheets, as well as the Cutsheets from the Cold Box Manufacturer.

Best bet is to consult with the Refrigeration Contractor for specific stuff.

Try obtaining as much relevant information possible. If the specific details &/or Requirements are unclear, or you are unsure of what to do, feel free to post a reply.

Good Luck.

-- Scott

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!