TM9-4120-400-14
FLUSHING THE REFRIGERANT SYSTEM.
5-13.
a. Flushing
b. Purging
This task covers:
INITIAL SETUP
Materials/Parts
Tools
Refrigerant R-114
Refrigeration Unit Service Tool Kit
Appendix E, item 5
Appendix B, item 1
Goggles
Equipment Condition
Appendix B, item 2
Gloves
Appendix B, item 2
Remove compressor (para 5-35).
Power Supply
Appendix B, item 6
Diaphragm Pump
Appendix B, item 8
FLUSHING
When a hermetic motor burns out, the stator winding decomposes forming carbon, water
and acid which contaminates refrigerant systems. These contaminates must be
thoroughly removed from the system to prevent repeated motor failures.
Flush the refrigerant system with refrigerant solvent R-114. Flushing should be done under a pressure of 8 to
12 psig (.56 to .84 kg/cm2). Procedures for flushing the system are as follows:
a.
Connect the discharge line of the pump to the tubing at point 1. Connect the recovery line to the tubing
at point 2. Leave the suction line service valve (point 3) and discharge line service valve (point 6) closed.
Cap the tubing at points 4 and 5.
b.
Start the pump and flush the line for approximately 10 minutes then turn the pump off.
Remove the recovery line from point 2 and cap the tubing at point 2.
c.
d.
Connect the recovery line to the valve at point 3 and open the suction line service valve.
e.
Start the pump and flush the line for approximately 10 minutes, then turn the pump off.
f.
Disconnect the bypass solenoid valve plug P8 from receptacle J8.
Energize the bypass solenoid valve by applying 28 volts dc across pins A and B of plug P8.
g.
h.
Start the pump and flush the line for approximately 10 minutes, then turn the pump off.
i.
Switch the pump lines so that the discharge line is connected to the suction line service valve at point 3
and the recovery line is connected to the tubing at point 1.
Start the pump and flush the line for approximately 10 minutes, then turn the pump off.
j.
5-33
