Over the past 4 years managing equipment upgrades across three warehouse locations, I've learned that Bohn refrigeration components are everywhere—evaporators, condensers, condensing units. But getting the details right? That's where the time goes. This article answers the questions I've had (and seen others ask) about Bohn equipment, wiring, and how it fits into a broader facility picture.
1. What exactly is Bohn, and where do their products fit in a commercial refrigeration system?
Bohn is a brand within Heatcraft Worldwide Refrigeration, specializing in commercial refrigeration equipment. Their product lines include unit coolers (evaporators), air-cooled condensers, condensing units, and pre-assembled systems for walk-in coolers and freezers. Think of them as a manufacturer of the 'cold side' components—the parts that actually remove heat from your cooler or freezer space. You'll find Bohn units in restaurants, grocery stores, cold storage warehouses, and industrial kitchens. They're not typically a 'retail' brand you'd buy off the shelf; you spec them through a refrigeration contractor or parts distributor.
2. Where can I find a wiring diagram for a Bohn evaporator?
This is probably the single most common question I've heard. For specific wiring diagrams, your best starting point is the Bohn Nomenclature system. Every Bohn unit has a model number that encodes its specifications. That model number is crucial for finding the correct diagram. Here are the places to look:
- The unit itself: There's often a wiring diagram affixed inside the electrical panel cover or on the inside of the access door. This is the most reliable source for that specific unit.
- Heatcraft's online resources: Heatcraft's website (heatcraftrpd.com) has a 'Literature & Resources' section where you can search by model number. They've improved this significantly over the last few years. As of May 2024, this was where I found correct diagrams for a Bohn LCL series unit cooler retrofit we did in Q3.
- Your contractor or parts house: If you're working with a refrigeration contractor or buying from a distributor like Johnstone Supply (where we get most of our components), ask them. They have access to technical support lines and can often pull the exact diagram faster than I can find it myself.
3. Bohn condensers vs. Bohn evaporators: what's the difference in a simple system?
People ask this because the terms get thrown around interchangeably on the job site. Here's the simplest way I think about it:
- Bohn evaporators (unit coolers): These are inside your walk-in cooler or freezer. They absorb heat from the interior space. The fan blows air over the cold coils, cooling the room.
- Bohn condensers: These are outside (or on the roof, or in a mechanical room). They reject the heat that was absorbed inside. The refrigerant passes through the condenser, and the fan blows air over the coils to dump that heat into the atmosphere.
4. How do I properly spec a replacement Bohn evaporator or condenser?
If you're like me, you're not specifying these from scratch—you're replacing a failed unit or upgrading an old one. The key steps I've learned through trial and error (and a few costly mistakes):
- Get the model number off the old unit. Don't rely on memory or paperwork. Go look at the tag on the side of the evaporator or condenser. It's usually a metal foil sticker. Take a photo.
- Check the Bohn Nomenclature. Bohn model numbers (like 'LCL120A' or 'AD1-072A') tell you capacity, voltage, fin spacing, defrost type, and application. (Example: a number like 'LCL' indicates a low-profile unit cooler with specific dimensions).
- Match application, not just size. A medium-temperature cooler needs different evaporator specs than a -10°F freezer. Freezer units require electric defrost to clear frost from the coils; coolers often use off-cycle defrost. Installing a cooler-rated unit in a freezer will lead to ice buildup and eventual failure.
- Verify refrigerant compatibility. If your existing system uses R-404A and you're retrofitting to R-448A (a common change in 2024/2025), the evaporator and condenser need to be compatible with the new refrigerant's pressure and oil type.
5. Are Bohn condensing units compatible with other brands of evaporators?
Sometimes yes, but it's not ideal. In the refrigeration world, mixing brands of major components is common in retrofit situations, but it introduces risk. The system relies on proper refrigerant charge, correct expansion valve sizing, and adequate oil return. A mismatched pair can lead to poor performance, short compressor life, or inefficiency. I get why contractors do it—when the old evaporator is still in good shape but the condensing unit fails, swapping just one part is cheaper and faster. Just be aware:
- You lose the 'system-level' performance guarantee. Bohn certifies its matched systems (condensing unit + evaporator) for specific conditions. Mixing brands means that guarantee is null.
- You need a refrigeration engineer or experienced technician to calculate the proper charge and ensure compatibility.
- In my experience, sticking with a matched Bohn condensing unit and evaporator combination saves headaches down the line. It costs a bit more upfront but eliminates 'who's at fault?' if something goes wrong.
6. What about Lasko heaters? Are they related to Bohn refrigeration equipment?
No. This is a common point of confusion. Bohn is a refrigeration brand (now part of Heatcraft). Lasko is a separate company that makes portable electric heaters, fans, and air purifiers for consumer and light commercial use. They have no corporate or product relationship. If you're searching for 'Lasko heater' because you're trying to find a heater for your walk-in cooler (like an anti-sweat heater or electric defrost), you're looking in the wrong place. For refrigeration defrost heaters or enclosure heaters, stick with Bohn-specific parts or commercial HVAC supply houses. I mention this because I've seen facility administrators accidentally order the wrong heater type—a Lasko space heater won't work in a refrigeration system.
7. How important is the Bohn parts nomenclature for ordering replacements?
Extremely important—this is where I see the most ordering errors. Bohn uses a detailed parts numbering system for fans, fan guards, expansion valves, defrost heaters, and even simple things like motor brackets. If you need a replacement fan motor for a Bohn evaporator, the model number of the evaporator alone is often not enough. You need the specific part number from the manufacturer's parts list. Why this matters: in Q2 2024, a contractor quoted me a $300 fan motor assembly for a Bohn unit. Using the Bohn parts list from Heatcraft's website, I found the exact part number and cross-referenced it with a local distributor. The price was $175. Same part. The lesson: the nomenclature system isn't a marketing gimmick—it's a precise tool for getting the right part the first time. Take 15 minutes to understand it before ordering anything critical.
Prices and product availability are as of January 2025. Verify current pricing and specifications with your local Bohn distributor or Heatcraft. Regulatory information is for general guidance; consult official sources for current requirements.
