Quote:
Originally Posted by Rawknees'Turbo
^^^
There is a good chance that they either did not get all of the air and moisture out of the system after all (possibly due to an unfound leak, as indicated by one of your vacuum charts), or did not add the proper amount of refrigerant (too much or too little), given the strange rise in evaporator temps even when the compressor is running.
Mini-splits come with the compressor pre-loaded with refrigerant that is sufficient for whatever length of piping the install manual specifies (more must be added if that length is exceeded); with your complex system (multiple evaporators/head units), I'm betting the installers did not correctly calculate how much additional refrigerant to add.
When set up correctly, those Mitsubishi's are capable of bone chilling cooling, way beyond what a normal person (me being abnormal!  ) would ever want. |
Good thinking.
1 - They/we did many evacuation runs with the last couple under 500 (~420) microns. From all my reading under 500 is good. However 420 is certainly nothing to write home about. I think the system is dry enough to operate to spec.
2 - They were aware that a calculated amount of R410A needed to be added - two people checked the calculation. Of course they could have still put in not enough.
3- Your last point is the best - When properly installed and setup I should get "beer" cold air.
He now admits something is off.