INDUSTRIAL COOLING
TCUs don’t fail – water kills them
Dave Roberts, Service Manager at ICS Cool Energy UK, explains why water treatment is the most overlooked service in plastics moulding, cooling and temperature control, and what it costs when it’s ignored.
"The tools to address it are practical and available: side-stream fi ltration, regular water analysis, appropriate inhibitor
programmes, and a more proactive maintenance culture."
H
ere’s how it typically unfolds. A temperature control unit (TCU) starts causing problems. Parts come off the mould inconsistently. Cycle times creep up. The issues persist for weeks, sometimes months. Eventually, a service engineer is called in.
By that point, the damage is almost always beyond economical repair. Recommendations are made: fi lter installation, draining the system and refi lling with treated water, but by then all the damage has already happened. A new TCU may be ordered. It arrives, gets installed, and is immediately introduced into the same environment, with the same untreated water system that caused the original problems. The cycle begins again. This pattern is well recognised by service engineers. When
a TCU fails, the customer blames the unit. The engineer knows the water is at fault. That is a hard conversation to have at the best of times, but it is especially diffi cult when you are eff ectively telling the customer the problem is their own, in the middle of a production crisis.
What makes this particularly damaging is that many TCUs are not especially expensive to replace. So rather than investigating the root cause, some operations simply buy another unit when one fails, put it on the same system, and wait for it to
degrade in turn. It is not treating the problem at the source, and is costing potentially thousands more in new equipment, repeatedly, without ever resolving the underlying issue. The cost of this pattern is diffi cult to quantify precisely. It depends on the number of machines, the number of moulds, the cycle time, and the value of what is being produced. It could be a small component or a large, high-value part. But in every case, poor water quality means a higher cost per hour, per day, and per year of lost or degraded production. Service engineers are typically only on site once or twice a year for scheduled servicing. For the rest of the year, the water system is entirely in the customer’s hands. Proactive advice can be given at the commissioning of the system or at the start of a service contract, such as what to monitor and what treatment routine to follow, but very few customers act on it until they see a problem. And by then, the advice arrives too late.
What water actually does to your systems In plastics manufacturing, three things are non-negotiable: tight temperature control, fast heat transfer, and consistent uptime. TCUs exist to deliver all three by circulating heated or chilled water through micro-channels within the mould tool to maintain precise process temperatures. Water quality is the critical variable that determines whether they succeed or fail. Poor water quality leads directly to longer cycle times, inconsistent parts, higher scrap rates, and unplanned downtime on moulding machines. The micro-channels within mould tools are extremely fi ne and block very easily. Any sediment, scale, or corrosion debris in the water circuit will restrict fl ow, disrupt temperature control, and compromise part quality.
Why TCUs are particularly vulnerable TCUs operate at higher temperatures than standard cooling circuits, and this is what makes water quality especially critical within them. Elevated temperatures accelerate corrosion. They also destroy inhibitors in the system faster. Even a water treatment programme that would survive in a standard cooling circuit will fail more quickly inside a TCU running at high temperature. Poor water that might last elsewhere will fail sooner in a TCU.
The consequences are wide-ranging. Sediment accumulates at the bottom of the tank and blocks internal components. Heater elements burn out. Pump failure, sticking valves, and
26 April 2026 •
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