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Frequently Asked Questions
Why is coolant treated as a consumable?
Its additive package is consumed in use.
Inhibitors deplete as they protect the metal.
Below an effective concentration, corrosion starts.
The fluid looks unchanged while that happens.
Only testing reveals it.
A fill-and-forget loop fails quietly.
What does the fluid have to do besides carry heat?
Protect every metal in the loop.
Resist biological growth.
Stay compatible with seals and hose materials.
Suit the electrical environment it sits in.
Heat transfer alone is a poor selection basis.
Compatibility usually decides before performance does.
Why do mixed metals matter?
A loop with aluminium and copper needs a matched fluid.
General inhibitors do not protect both equally.
Galvanic attack starts at the weaker metal.
Topping up with the wrong product spreads the problem.
List the wetted materials before choosing.
Later additions to the loop change the answer.
Can the loop be topped up with water?
No, and it is the commonest mistake.
Water dilutes the inhibitor, not just the concentration.
Protection falls across the whole system at once.
Freeze protection falls with it where glycol is used.
Top up with the specified premix.
Keep a stock of it on site.
How often should a loop be tested?
On a schedule, from commissioning onward.
Inhibitor level is the primary measurement.
Biological activity and conductivity follow.
Sample points should be designed in.
Retro-fitting a sample point means draining.
Suppliers usually offer a testing programme.
What makes a dielectric fluid different?
It is chosen for electrical behaviour first.
That matters where liquid may contact live parts.
Heat transfer is generally lower than water.
Cost per litre is considerably higher.
Volume matters in immersion applications.
Specify it for the contact risk, not for performance.
Does the IT vendor decide the fluid?
Effectively, yes.
Approved fluid lists are tied to warranty.
Using an unlisted product can void coverage.
Facility preference comes second to that list.
Confirm it before designing the loop.
Lists change between hardware generations.