help please

[npp230v]

just returning to air con ive got to go to a couple of split units on 410 can any one give me a refresher on the test points and readings to check if is a system is over / under charged also any genral things to check on a service
cheers
nick
or is any one in stoke on trent to give advice

[hendry]

just returning to air con ive got to go to a couple of split units on 410 can any one give me a refresher on the test points and readings to check if is a system is over / under charged also any genral things to check on a service
cheers
nick
or is any one in stoke on trent to give advice
Hi, everything starts from basics.

many of my workers tends to skip steps...

you know what ... assumption/s made charred your troubleshooting process.

my advice to you ... starts from the refrigeration cycle & move on to control & instrumentation. you won't miss the problems.

cheers.

Hendry @ Malaysia