The Heat Is Here

— DAVE SR. ON MARINE AC

YOUR SEA STRAINER ISN’T THE ONLY ELEMENT THAT CAUSES A FLOW PROBLEM.

Scale and biofilm buildup inside the condenser cooling coil is one of the most common causes of poor cooling performance we see — and it presents exactly like a low refrigerant charge. Before anyone calls for a refrigerant diagnosis, it’s worth ruling out the condenser cooling coil first. A quick flow and condenser temperature test tells you everything.

A PARTIAL RAW WATER PUMP FAILURE IS WORSE THAN A FULL ONE.

A dead pump is obvious. A degraded one is the problem. If your system runs a bronze pump, the culprit is almost always the impeller — and a worn impeller doesn’t always look worn. Place it next to a new one and the difference is clear. On its own, it can pass a visual inspection and still be well past its service life. When flow drops, head pressure climbs, the compressor starts working harder than it should, and by the time something feels off, the damage is already done. There’s no warning light for “almost enough cooling water.” We replace bronze impellers annually on every South Florida vessel we manage, regardless of apparent condition. It’s not a repair. It’s a scheduled part swap that costs a fraction of what it protects.

DON’T OVERLOOK YOUR AIR HANDLERS.

The chiller gets all the attention, but the air handlers are where the cold air actually enters the cabin — and they have their own failure points. Evaporator coils accumulate dust and salt air buildup that acts as insulation and kills efficiency. Blower motors degrade gradually, moving air but not enough of it. And condensate drains clog quietly — in South Florida humidity, that moisture has to go somewhere, and when the drain is restricted, it ends up in your liner or behind your cabinetry. We inspect coil condition, blower function, and condensate drainage on every unit. If the rest of the system checks out and the cabin still isn’t cooling the way it should, the air handlers are usually where we find it.

And if you’re dealing with recurring buildup and fouling throughout your system, ask us about ElectroSea — an electrode-based treatment system that eliminates biological and mineral fouling before it becomes a problem. No chemicals, no acid, nothing corrosive — just clean flow all season.

CHILLED WATER SYSTEMS HAVE FAILURE MODES THAT DIRECT EXPANSION SYSTEMS DON’T.

The cooling loop requires antifreeze — not just for freeze protection, but because it’s also your primary corrosion inhibitor. If the concentration drops, you lose both. Most chilled water systems develop minor leaks over time. The crew manages it — there’s usually a valve to top off the loop and keep pressure normal. But every time you add water without adding antifreeze, you’re diluting the mixture. Eventually the concentration drops below the point where it protects the condensing unit, and if the system faults at the wrong moment, you’re looking at a frozen condenser and serious damage. If your crew is regularly topping off the cooling loop, that’s not routine maintenance — it’s a symptom worth chasing down. Every chilled water service call we do includes a glycol concentration test so you know exactly where your protection stands.

And if you’re running multiple chillers, the loop chemistry issue is only part of the conversation. Most multi-chiller setups default to the same lead unit running at full capacity all summer while the others barely turn. That lead unit ages out years ahead of schedule — and the backup units haven’t been adequately exercised. We can install a PLC-based Lead-Lag rotation controller that distributes runtime evenly, keeps peak electrical load down, and turns your theoretical redundancy into something you can actually rely on. If you haven’t addressed either of these, both are worth a conversation.

“FAILED” CONTROL BOARDS ARE USUALLY JUST CORROSION.

Before anything gets replaced, we check every electrical connection in the system. You’d be surprised how many board replacements we’ve avoided with a wire brush, dielectric grease, and fresh terminal connections.

We specialize in Aqua Air systems and have been servicing and repairing them throughout South Florida for decades — if you’re running Aqua Air, you’re in the right hands. Learn more about our marine AC services here.