"Geoff" wrote in message
ups.com...
I am installing a split system airconditioner, is it normal for the
inside unit to have pressure in the pipes? When i went to remove the
end caps from these pipes inorder to connect the pipework from the
outside unit they are under pressure and 'gas' leaks out as soon as i
crack the nut, what is this 'gas'? is it just in there to keep the
system at a positive presure and thus prevent any moisture etc entering
the system? If not what do i do? these caps have to be removed inorder
to connect the pipes between inside and ouside units?
Thanks for any help
Geoff


it will either be protective gas or it will be vacuum (less likely)