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TM5-4120-376-14
5-19. REFRIGERANT VALVES AND RELATED TUBING/Test, Repair, Replace (Cont)
LOCATION/ITEM
Removal:
3. Remove fourteen screws (7) and front cover (8) from housing.
4. Remove seven screws (9) and center cover (6) from housing.
WARNING
Purge system with dry nitrogen prior to soldering. Refrigerant heated to
1200°F (649°C) creates phosegene gas.
WARNING
Avoid contact with refrigerant acid. Burns could result from contact with
refrigerant.
WARNING
Refrigerant R-22 is contained in the refrigerant system under high pressure.
Extreme care must be exercised to prevent refrigerant from coming in contact
with exposed skin and eyes. Provide adequate ventilation when discharging the
system in a confined area. All refrigerant gas must be discharged from system
before performing any removal procedures of refrigerant components.
CAUTION
Maintain a 1-2 cpm (0.1-0.2 M3/Min) flow of dry nitrogen through the
refrigeration system to prevent oxidation and scaling when brazing or debrazing
components.
NOTE
Always perform inspections and test before removing refrigerant components.
The Expansion Valve and Quench Valve are hermetically sealed and cannot be
repaired. Pressure Relief Valve is factory set and is not field adjustable.
5-33
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