The purchase order lists the laser, the chiller, the cleaning head and the warranty. It rarely lists the three things that decide whether the machine is still producing in month twelve: the quality of the power feeding it, the stability of the cooling loop, and the condition of a lens that costs less than a dinner for two.

Power quality: the failure mode nobody budgets for

The manual is direct: power interruption is very harmful to the laser, and the machine needs a continuous, reliable supply. A 6 kW-class cleaner is not a hand tool that happens to be on a cart. It is a production machine with a laser source, a chiller, a control cabinet and a hand-held head, and all of them share the same supply.

A voltage sag, a lost phase or a breaker trip does more than stop the beam. It can trip the laser, leave the chiller pump restarting against a hot loop, and stress the laser module. Repeat that often enough and the failure shows up as an electronic fault weeks later, far from the event that caused it.

The practical minimum is a dedicated circuit sized to the nameplate, a breaker rated for the inrush, correct cable cross-section, and a reliable protective earth. Surge protection is cheap insurance; a voltage stabiliser is worth considering where the grid fluctuates or where a generator is the primary source. Do not share the circuit with welders, large compressors or other high-inrush loads. Avoid extension reels and adaptors.

The manual also warns against opening panels or connecting and disconnecting electrical lines while powered. Those are not only safety rules; they are the difference between a service call and a warranty discussion.

Cooling: 25°C is a process parameter

The chiller setpoint is 25°C, and the laser should not be started until the loop reaches it. That is not a comfort setting. It is the temperature at which the laser's thermal design is stable, and cleaning performance, lens life and alarm behaviour all depend on it.

The cooling loop has three common failure paths. A blocked exhaust or a cabinet pushed against a wall raises the chiller's condensing temperature until the high-temperature alarm trips. A kinked or flattened 6 mm hose drops flow until the flow alarm trips. Scale, biofilm or low water level reduces heat transfer slowly, without an alarm, until the laser derates or the lens runs hot.

The manual's water rules are worth repeating: distilled or pure water, not tap water; check the whole circuit for leaks at first start; replace the water every two to four months; use antifreeze and keep the chiller running 24 hours a day when the ambient temperature is between -10°C and 0°C; drain the system before long storage. The manual gives two months in one chapter and three to four months in another; on a clean, sealed loop, two to four months is a workable range, with water quality and duty cycle deciding where in that range you land.

Ambient conditions matter too. The specified operating range is 5–40°C and below 80% RH. Keep the cabinet's ventilation openings clear, leave space for the exhaust, and do not install the unit in a sealed container or a corner with no air movement. In a 35°C workshop, a chiller that is undersized or badly ventilated will run at its limit all shift. The laser may not fail, but the machine will alarm or derate.