Refrigeration 101

[spoon man]

Sorry to but in. I work on chillers for industrial. Supplying cooled water for various machines. A sub cooling of 15oc should be acheavable with any system there or about and 5oc superheat give or take. If you are not acheiving this its the same route. Gas charge/condensor fault/evap fault/ tev fault/ and abnormal ambient range. Your gauges are your friend and a simple logical reason. Look for signs like liquid return to compressor(bottom iced up) or tev iced up, mass dt across evaporater, low diff across condenser etc

[spoon man]

In that case check pump curves - completely different game but very easy to grasp.

[chillerman2006]

Sorry to but in. I work on chillers for industrial. Supplying cooled water for various machines. A sub cooling of 15oc should be acheavable with any system there or about and 5oc superheat give or take. If you are not acheiving this its the same route. Gas charge/condensor fault/evap fault/ tev fault/ and abnormal ambient range. Your gauges are your friend and a simple logical reason. Look for signs like liquid return to compressor(bottom iced up) or tev iced up, mass dt across evaporater, low diff across condenser etc

Spoon Man

a condensor has 3 jobs to do when rejecting heat

de-superheating (specific heat rejection)
condensing (latent heat rejection)
subcooling (specific heat rejection)

the last subcooling depends if the coil has been sized accordingly to subcool the refrigerant and to what degree, industrial refrigeration will subcool the already de-superheated/condensed refrigerant but most package chillers dont subcool to 15*c, in fact many struggle to reach 6*c

Exactly what make/model are you referring to ??? @ 15*c many will be overcharged

R's chillerman