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Reading a running system means stating its charge state and likely failure point without disassembling anything . A tech who can do that is a tech the owner trusts. This chapter builds the reflex: rea

Marine air conditioning is not car A/C with salt spray. The same thermodynamic cycle runs through four very different system families, and the family you are standing in front of determines the refrig

A marine AC control board and its display are a matched pair . The board drives the display, the display sends setpoints back, and the cable between them is the only physical connection. If the displa

This is where refrigeration becomes a trade: weigh in charging, evacuation, metering devices, and leak detection. These are the hands on skills that make or break a refrigeration tech. The discipline

:::video /img/t27/s5 hull water 1280x720.mp4 | A marine refrigeration circuit, on a working vessel Marine refrigeration is the same thermodynamic cycle as marine AC, applied to keeping a catch fresh o

Marine refrigeration reaches beyond the cabin: remote condensers, remote evaporators, ice makers, and walk ins. Each is the same cycle in a different package, and the failure modes shift with the pack

This is the full repair cycle on a live marine refrigeration system: diagnose the failure, identify the component, perform the repair, verify the charge, and document the work to ABYC specification. T

The compressor is the heart of the refrigeration cycle, and on a boat it is the most expensive component in the system. This chapter covers scroll vs rotary, the two failure patterns that look like "t

A water maker is its own closed system: pump → filters → membrane → UV. This chapter builds the architecture — how seawater becomes fresh water, the role of each stage, and the difference between the

This is the service path for a water maker: membrane replacement, pump service, control board diagnostics, system flushing, and the correct maintenance sequence. Note: we do not descale water makers —

The SpotZero field service bulletins define what is actually in the field — which components have been replaced, which procedures have changed, and which parts are no longer available. This chapter co

The core of the 608 exam is the ability to read a running refrigeration system and state its charge condition from the readings. This chapter covers superheat and subcooling interpretation, and the tw

Before you touch a refrigerant system in the US, you need EPA 608. This chapter covers the handling rules, recovery equipment, and the environmental regulations that govern R 134a, R 404A, and R 410A.

This chapter is the bridge between the course content and the real EPA 608 exam. Three full practice exams (Type I, Type II, Universal), timed to the actual exam duration, with weak area remediation a

This is the hands on vessel inspection: identify the system from the nameplate, verify the installation against the ABYC specification, document the findings, and issue a compliance report that insure

Insurance, resale, and charter compliance all hinge on ABYC documentation. This chapter maps ABYC E 11 (HVAC) and A 38 (plumbing) to the Dometic and SpotZero systems you will be working on. A system t