On Jun 24, 9:23*pm, "John Gilmer" wrote:

Well, a good quality outside unit (compressor, coil, fan) usually has built
in isolaton valves and MOST of the "gas" is already in the unit. * Most of
the weight of the gas is in liquid form. * *A small about of gas would be
added after the tube set and the inside coil are installed, connected, and
pumped down.
In some cases, both the tube set and the inside coil are shipped precharged.
All the tech does is connect things and then does some temperature/pressure
checks to see whether any more "gas" needs to be added or taken out.



I wondered how they did that. I assume they connect the inside-to-
outside lines, pull a vacuum on them, then open the isolation valves?


*But maybe a case can be made for 2 workers (with one being a goffer).
*Only one guy needs to be a HVAC tech.


Mine was installed with a crew of 3; 2 experienced workers and the
HVAC tech. One did the inside work, one did the outside work, and the
HVAC tech floating between the two keeping an eye on things and
helping where needed. That's why they got the job done in less than 5
hours and moved on to the next job.

The extra time needed to pick up the new stuff and dump the old might be 2
hours depending upon local circumstances.


When mine was put in, the installer had the supplier deliver the unit
to the site. When the old unit was removed, he called a scavanger who
came in a old pickup with his kids and hauled everything off. Saved
the installer time & labor.

Red