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johnmac 02-18-2013 03:22 PM

ductless havc
 
I want to install a ductless havc unit myself. Can you purchase a unit that is precharged with, and if so from which company?

747 02-18-2013 04:49 PM

if your talking Mitsubishi heat and cool unit. They are precharged.

ratflinger 02-18-2013 05:33 PM

No warranty unless you are a certified HVAC person.

GarrettFiveZero 02-18-2013 05:49 PM

Quote:

Originally Posted by ratflinger (Post 1119951)
No warranty unless you are a certified HVAC person.

Not true, depending on brand, many HVAC systems are warrantied regardless of who installed them. To the OP, most of the ones I've seen are already precharged.

beenthere 02-18-2013 06:44 PM

Mini splits come precharged for X length of line set.

av-geek 02-18-2013 06:52 PM

They are pre-charged, but you will need to use a vacuum pump to vacuum the lines of air once everything is connected up. This also allows you to check for leaks, as the vacuum should hold for over an hour once it's pulled down (If you see gauge moving back up, it's time to go back and check your connections) Once the lines are vacuumed down and all air/moisture is removed, you can then open the valves on the outdoor unit and let the refrigerant into the lines and the indoor unit...the system will then be ready for use.

If you want to install the system yourself, you will need to borrow or rent a vacuum pump. You should not need to add any charge to the system. Most mini-splits have enough charge for a 25 foot lineset. A longer lineset will require more refrigerant than what's contained in the outdoor unit's compressor.

ratflinger 02-18-2013 10:43 PM

Quote:

Originally Posted by GarrettFiveZero (Post 1119966)
Not true, depending on brand, many HVAC systems are warrantied regardless of who installed them. To the OP, most of the ones I've seen are already precharged.


I should have qualified that more - I believe Mitsubishi and most of the others require a HVAC professional to make the final connections, perform any testing & start the unit.


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