A chiller that’s slightly too small for the job doesn’t usually fail outright. It just runs harder than it should, all the time, and the cost of that gets absorbed quietly into cycle time, part quality, and your energy bill.
Here’s how an undersized chiller actually affects your process, and what to check if you suspect yours might be under-specified.
Why Chiller Sizing Gets Overlooked
Chillers are often specified early in a project, sometimes before the full tooling and production plan is finalised. A chiller sized for one job can end up serving several moulds over its lifetime, some far more demanding than the original spec accounted for.
Because a chiller rarely fails completely when it’s undersized, the problem tends to hide in plain sight. It just works harder, for longer, without ever throwing an obvious fault.
How It Actually Affects Your Process
1. Longer Cycle Times
If the chiller can’t remove heat from the mould fast enough, cooling time has to stretch to compensate. This adds seconds to every single cycle, which adds up to a significant amount of lost output over a full production run.
2. Inconsistent Mould Temperature
An undersized chiller struggles most under peak load, which means mould temperature can drift during long runs even if it looked fine when the process was first set up. This is a similar pattern to what we’ve covered in common causes of inconsistent moulded parts — a slow drift that’s easy to miss until it shows up in the finished product.
3. Warping and Dimensional Issues
Uneven or insufficient cooling changes how a part shrinks as it solidifies. This often shows up as warping, sink marks, or dimensions that fall outside tolerance, especially on parts with thicker sections that need more heat removed to cool evenly.
4. Higher Running Costs
A chiller working constantly at or near its limit draws more power than one sized correctly for the load. Over a year of continuous running, that difference in energy use adds up. It also puts extra wear on the compressor from running flat out.
5. Shortened Equipment Life
Compressors and pumps designed to cycle on and off wear differently to ones running continuously under strain. An undersized chiller often needs replacing sooner than one properly matched to the load it’s cooling.
How to Check If Yours Is Undersized
Start by comparing your chiller’s rated cooling capacity against the actual heat load of the tools it’s running. This means mould size, material type, wall thickness, and cycle rate, not just the tonnage of the moulding machine itself.
Watch for cycle times that have crept up over time without a clear cause. Also watch mould temperature readings that vary more than expected across a long run. Both are common signs the chiller is being asked to do more than it’s rated for.
Getting the Sizing Right
Chiller sizing depends on more than machine tonnage. It needs to account for the specific tools being run, ambient conditions, and how much headroom you want for future tooling. Our range of chillers is specified against your actual production requirements, not a generic match to machine size.
Get in Touch
If you suspect your chiller might be undersized, or cycle times have been creeping up without an obvious cause, we’re happy to take a look at the numbers with you.
Geiger Handling UK Ltd
Phone: 01782 630555
Email: sales@geigerhandling.co.uk
Web: geigerhandling.co.uk