TM9-4120-400-14
FLUSHING THE REFRIGERANT SYSTEM. - continued
5-13.
Purge the system with nitrogen at approximately 30 psig (2.11 kg/cm2) as follows:
Make sure all caps are off the tubing ends and that the suction and discharge line service valves are open.
a.
b.
Connect the nitrogen line to the tubing at point 1 and release nitrogen into the system for approximately 5
minutes or until moisture ceases to be discharged from the system.
Energize the bypass solenoid valve by applying 28 volts dc across pins A and B of plug P8.
c.
Release nitrogen into the system for approximately 5 minutes or until moisture ceases to be discharged
d.
from the system.
Remove the nitrogen line from the tubing at point 1 and connect it to the tubing at point 2. Release
e.
nitrogen into the system for approximately 5 minutes or until no moisture is discharged from the system.
f.
De-energize the bypass solenoid valve and release nitrogen into the system for approximately 5 minutes
or until moisture ceases to be discharged from the system.
Energize the pressure equalizer solenoid valve by applying 28 volts dc across pins A and B of plug P9.
g.
h.
Release nitrogen into the system for approximately 5 minutes or until moisture ceases to be discharged
from the system.
i.
Remove the nitrogen line from the tubing at point 2 and connect it to the tubing at point 5. Release
nitrogen into the system for approximately 5 minutes or until no moisture is discharged from the system.
De-energize the pressure equalizer solenoid valve and release nitrogen into the system for approximately
j.
--
5 minutes or until moisture ceases to be discharged from the system.
Remove the nitrogen line from the tubing at point 5 and connect it to the tubing at point 4. Release
k.
nitrogen into the system for approximately 5 minutes or until no moisture is discharged from the system.
l.
Remove the nitrogen line from the tubing at point 4 and connect it to the valve at point 6. Release
nitrogen into the system for approximately 5 minutes or until no moisture is discharged from the system.
m. Remove the nitrogen line from the valve at point 6 and connect it to the valve at point 3. Release nitrogen
into the system for approximately 5 minutes or until moisture ceases to be discharged from the system.
n.
Remove the nitrogen line from the valve at point 3.
o.
Close the suction line and discharge line service valves.
Cap all open tubing until installation of new components.
p.
Reconnect plugs P8 and P9 to receptacles J8 and J9 respectively.
q.
NOTE
FOLLOW-ON MAINTENANCE:
5-36