To prevent damage to other parts of the unit, wrap the two solenoid
valves (L1 and L2) the expansion valve, and the quench valve with
wet rags to act as a heat sink.
If brazing or debrazing is necessary on any part of the system, a
constant purge of dry nitrogen must be fed through the system
being soldered to prevent scale formation or oxidation within the
Uniformly apply heat to the brazed joint until the liquid point of the brazing
alloy is reached. While still at the liquid point, separate the parts.
Tubing and fittings attached to the damaged part can be used on the replacement
e. INSULATION AND GASKETS.
Replace damaged insulation and gaskets.
Cement loose insulation using MMM-A-121 Adhesive.
3. Adequate heat shielding should be provided to avoid heat damage to insulation
Replace damaged screws, flat washers, lockwashers, and nuts.
Use screws of correct length to hold parts securely.
In some application, screws that are too long may bottom before the head is snug
causing damage to the threads or other parts.
g. REPAIRING DAMAGED THREADS.
Damaged threads should be repaired by use of a thread restorer.
Internal threads can be repaired with a tap of the correct size.
If threads cannot be satisfactorily repaired, replace the part.