charging calculation formula

[panaboro]

what is the charging calculation formula used when 25 feet pre-charged line set R-22 is extended to 50 feet ?

how much more refrigerant needed to the additional 25 feet line set without refrigerant in it ?

[jpsmith1cm]

What type of metering device?

What are the indoor conditions, outdoor conditions?

Type of refrigerant doesn't matter.

[jimj]

What type of metering device?

What are the indoor conditions, outdoor conditions?

Type of refrigerant doesn't matter.

Not to mention what is the line set size!

[darctangent]

Sorry, panaboro.

No DIY help to non pro members.

Read site rules and apply for pro status if you qualify.

[panaboro]

what is the charging calculation formula used when 25 feet pre-charged line set R-22 is extended to 50 feet ?

how much more refrigerant needed to the additional 25 feet line set without refrigerant in it ?
3/8 liquid and 7/8 suction with TXV. there is no mention indoor/outdoor condition. but i guest will be standard design temperature 95*outdoor and 75* indoor 50% RH


I had a test question a month ago that i can't find the answer in my book.


thanks

[panaboro]

I want to find the answer for a test question i had a months ago.
i can do subcooling or superheat but its a test.
thanks

[jpsmith1cm]

I'm sorry, I misread the question.

This is actually a queston regarding the volume added to the lineset and the density of the refrigerant.

The BEST way to correctly charge a unit is to use superheat or subcooling depending on the metering device.