5. Evacuate using either deep vacuum or triple evacuation method.
6. After evacuation is complete, fully close the low side of manifold gage and stop
operation of vacuum pump.
7. The factory charge contained in the outdoor unit is good for up to 25 ft. (8 m) of line length.
NOTE:
For refrigerant lines longer than 25 ft (8 m), add add’l refrigerant per foot of extra
piping up to the maximum allowable length. See System Requirement section on page 4
for more info
8. Disconnect charge hose from charge connection of the low side service valve.
9. Fully open service valves B and A.
10. Securely tighten caps of service valves.
20
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns
and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum
method is the most positive way of assuring a system is free of air and liquid water.
VACUUM TESTING
Deep Vacuum Graph
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
Leak in
System
Vacuum Tight
too Wet
Tight Dry
System
