how to calculate charge refrigerant / ft of pipe

[jcastillo401]

hello, here is the deal

I fixed a leak on evaporator the unit is split system heat pump, come from factory pre-charge with 290 oz (18.2 lb) of r-22 this charge is good for 25 ft, but the unit installation is about 60 ft apart (air handler-compressor), the pipe size is 3/4 low 3/8 high, how can I calculate how much more refrigerant is needed to complete the charge.

thanks

[Sandro Baptista]

Add more 0,6 kg (S.I. units) » 1,323 lb.

[james10]

follow this link
http://www.refrigeration-engineer.com/forums/showthread.php?t=27059