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TM5-4120-376-14
5-22. COMPRESSOR, ACCUMULATOR AND RELATED PARTS/Replace (Cont)
LOCATION/ITEM
Test:
1. Remove the filter-drier (dehydrator) in accordance with paragraph 5-20, page 5-46 and
blow down each leg of the refrigeration system.
To do this, connect a cylinder of dry nitrogen
(Table E-1, Item 8) to each filter-drier connection, in turn, and open the cylinder shutoff valve
for at least 30 seconds at 50 psig (3.5 kg cm2) pressure.
2. Connect the two filter-drier fittings with a jumper locally manufactured from refrigerant
tubing and fittings, and install a pump, reservoir and filter in place of the compressor.
3. Disassemble expansion valve and quench valve and temporarily remove the valve cages.
Re-install shell of power assembly, using a gasket between power assembly and body to prevent
leakage. Tag and retain valve cages for use at reassembly.
4. Disassemble solenoid valve in accordance with paragraph 5-19, page 5-36.
5. Fill reservoir with fluorocarbon refrigerant, (Table E-1, Item 10) and start the pump.
Continue filling the reservoir with refrigerant, until it begins to pour out of the return line.
Continue flushing for at least 15 minutes.
6. Reverse the pump connections, replace the filter with a new filtering medium, and back-
flush the system for an additional 15 minutes.
7. Remove the pump, reservoir, filter and filter-drier jumper. Place an empty container
below the compressor connection, and connect a cylinder of dry nitrogen (Table E-1, Item 8) to
each filter-drier connection in turn. Blow down each leg of the system at 50 psig (3.5 kg/cm 2,
for at least 30 seconds.
8. Disassemble both expansion valves and re-install the valve cages. Install new gaskets, and
assemble the valves, making sure that projections in valve cages fit in notches in valve bodies.
9. Disconnect the dry nitrogen cylinder, and immediately install a new filter-drier, making
sure that the direction of flow arrow points up. Cap or plug compressor connections if com-
pressor is not to be installed immediately.
Installation:
WARNING
Purge system with dry nitrogen prior to soldering. Refrigerant heated to
1200°F (649°C) creates phosegene gas.
5-66
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