I have ordered a wall mounted 'Easyfit' AC system and will be installing it
my self :-)
I've not seen the installation instructions yet, but I gather that the
general idea with this sort of system is that you purge the air and moisture
from the indoor unit by venting some of the R410a from the pre-charged
outdoor condenser unit.
Now, being a bit of a perfectionist at times, I have started to research the
Pros /Cons and moral issues involved here. I might install a second one of
these units at some point and I am concerned about the longevity/
and effectiveness of my AC systems !
As I understand it so far, I would just need to get a vacuum pump and a
manifold gauge set, Then connect the pump to the suction side on the
condenser unit via the low side gauge and let the pressure fall to 0 psi
over 15 mins or so. Doing this means that any water in the lines or wall
unit will boil off.
So then you close the valve on the gauge and check that the vacuum holds.
Next you can crack the high ( liquid ?) valve on the compressor and close it
again when the gauge reads 100 psi. or so. This means I will be able to
check for leaks under a vacuum and also after I've released the
Assuming no leaks ( soapy water to boot ) then what ? I fully open both
valves on the compressor ?
Do I need to do any thing else before removing the hose from the Gas side
service port ?
I don't mind forking out for the gear to do the job properly, can always try
to sell it on ebay !
The system is charged with a pre-determined wieght of liquid refrigerant.
The exact weight will depend on whether or no there is a reservoir and if so
how big it is.. (Having one is a good idea.)
The sytem is usually marked with the type of gas and the weight of gas when
There is a chart comes with the maintenance manifold gives the operating
pressures for various refrigerant gases running at different temperatures
for adding your own gas.
Some sytems have a sight glass to see the refrigerant level.
The sytems contains a dryer that removes moisture from the system. Moisture
reacts with the refrigerant and produces an acid which attacks motor
The dryer is the little bulb between the condenser and the capilliary
tube/expansion valve. You are supposed tochange it if the system is broken
Get a pre charged sytem. Not only do you have to buy the manifold, you have
to buy gas, brazing equipment, leak detector etc etc. for a disparate
Or get a "through-the-wall " system, no plumbing needed, less likelyhood of