A 5-Step Checklist for Choosing the Right Bohn Refrigeration Condensing Unit (From Someone Who's Made Every Mistake)

When I first started handling refrigeration orders back in 2017, I thought picking a Bohn condensing unit was simple—just match the tonnage and check the price. Three rejected shipments, one $890 redo, and a lot of embarrassment later, I realized I was missing the real checklist. This isn't theory. It's the list I now give every new engineer in our team, especially the ones dealing with small orders that big suppliers tend to ignore.

Who This Checklist Is For

If you're a small contractor, a first-time buyer, or a distributor handling a customer who just needs a single Bohn unit for a walk-in cooler, this is for you. The steps work whether you're ordering one or fifty units, and they're built to catch the mistakes that cost you money and credibility.

Step 1: Match the Unit to the Actual Operating Environment (Not Just the Box Size)

Most buyers focus on refrigeration tonnage (BTU/hr) and forget everything else. I once ordered a standard Bohn condensing unit for an outdoor installation because it was cheaper. Didn't think about ambient temperature. The unit failed in a heat wave, and the compressor burned out. $3,200 lost.

Here's what to check:

• Ambient temperature range: If the unit sits outside in direct sun, you need a model rated for high ambient (often with a fan cycling control). If it's indoors but hot (like near a bakery), same thing.
• Voltage and phase: 208-230V single-phase vs. three-phase. I've seen people order a three-phase unit for a single-phase site (didn't catch it until delivery).
• Refrigerant type: R404A vs. R448A/R449A. Don't assume the old standard still works—check current regulations. (As of 2025, many new installations are switching to low-GWP refrigerants.)

Bohn's model numbering system actually tells you most of this (bothersome to decode at first, but worth learning). Find the wiring diagram and spec sheet before you order.

Step 2: Verify the Distributor's Stock and Lead Times (Before You Promise Anything to Your Customer)

I once told a client I could deliver a Bohn condensing unit in three days—only to find out my usual Bohn refrigeration distributor had a six-week lead time on that model. Smaller distributors might have better availability for niche models, but they also might not stock them. Call ahead. Ask about current lead times in writing.

And if you're a small buyer placing a low-volume order—don't be shy. A good distributor won't ghost you. I've seen small dealers treated like they're not worth the paperwork. But I've also seen the opposite: distributors who know that today's $200 order is tomorrow's $20,000 repeat business. (That's the kind you want to work with.)

Step 3: Confirm the Accessories You Actually Need (AC Fan Motor, Outdoor Heater, Etc.)

This is where I made my most embarrassing mistake. I ordered five Bohn units without specifying that they needed the low-ambient kit (outdoor heater for the crankcase). The units arrived with no head pressure control, which meant they'd freeze up in winter. I had to retrofit them later—$450 wasted plus a week delay.

Common add-ons to consider:

• Crankcase heater (needed for outdoor units in cold climates)
• Head pressure control valve (for low-ambient operation)
• Fan cycling kit (to maintain head pressure in winter)
• AC fan motor replacement type (if you're retrofitting an existing system, match the OEM motor specs; a universal ac fan motor might need a different bracket)
• Outdoor heater for the accumulator (prevents liquid flood-back in cold weather)

Bohn's spec sheets usually list recommended accessories. Don't skip that section.

Step 4: Double-Check the Connection Types (Sweat vs. Flare vs. O-Ring)

This one is a classic rookie mistake. I once ordered a condensing unit with sweat connections (i.e., brazed joints) but the evaporator coil had O-ring seal connections. The mismatch meant I needed additional adapter fittings, which weren't in stock. Another $150 and a lost weekend.

Check whether your Bohn unit comes with:

• Sweat (copper stub-out): requires brazing on-site
• Flare: screw-tighten, common on smaller units
• O-ring (pre-brazed): push-to-connect or flange style

Make sure the mating part (evaporator, line set) matches. If not, order the correct fitting kit before installation day.

Step 5: Plan for the Unexpected (Including the "Can You Put Glass in the Freezer?" Question)

This sounds ridiculous, but it's a real question we get. People want to know if they can store glass jars in a walk-in freezer with Bohn evaporators running. The short answer: yes, as long as the glass is freezer-safe (borosilicate or tempered). Regular glass can shatter from thermal shock when the defrost cycle kicks in and the temperature swings. So—don't use standard Mason jars for leftover soup in a Bohn freezer. (Surprise, surprise, the internet is full of conflicting answers on this.)

My rule: if a customer asks this question, I include a note in the installation manual about safe container materials. It shows you know your stuff, and it prevents a phone call later when a jar explodes.

Final Thoughts (and the Mistakes You Want to Avoid)

The three biggest errors I've seen in five years:

1. Ordering the wrong voltage. Always confirm on-site power before placing the order. One guy ordered 460V units for a 208V building—all six had to go back.
2. Ignoring ambient temperature. A Bohn unit that's perfect for a 70°F machine room will trip on high-pressure cutoff at 100°F+ outdoor temps in summer.
3. Assuming the distributor will catch your mistake. They won't. It's your job to verify the model number, accessories, and lead time. (I learned this the hard way in September 2022—the $890 redo I mentioned earlier.)

I'm glad I created this checklist after my first disaster. It's saved us from at least a dozen similar incidents since. If you're a small buyer just starting out—don't let the size of your order make you skip these steps. Good equipment deserves good planning, no matter the quantity.

Prices and specifications as of March 2025; verify current details with your Bohn distributor.