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Component Replacement/Brazing
Warning:
•
Ensure sufficient ventilation at the repair place.
Warning:
Presence of fire extinguisher. If any hot work is to be conducted on the refrigerating equipment or any associated
parts, have a ABC class fire extinguisher available to hand.
Warning:
No person carrying out work in relation to a REFRIGERATING SYSTEM which involves exposing any pipe work shall use any
sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including cigarette smoking, should
be kept sufficiently far away from the site of installation, repairing, removing and disposal, during which refrigerant can possibly be released
to the surrounding space. Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable
hazards or ignition risks.
Warning:
Ensure there are no open flame sources or hot surfaces that exceed 1200˚F in the work area.
NOTE: When brazing is required, the following procedures shall be carried out in the right order:
1. Install a piercing valve to remove refrigerant from the sealed system. (Piercing valve must be removed from the system before
recharging.)
2. Remove and recover refrigerant, and evacuate the system.
manual.
3. Purge circuit with inert gas such as nitrogen.
4. Remove parts to be replaced by cutting, not by flame.
5. Perform a check of the work area for the presence of flammable refrigerant prior to brazing or performing any hot work. Use a non-
Sparking (Not Halide )Electronic Leak Detector rated for detecting R-32 refrigerant.
Warning:
Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide
torch (or any other detector using a naked flame) shall not be used.
Ensure that the detector is not a potential source of ignition and is A2L certified leak detector.
6. Purge the braze point with nitrogen during the brazing procedure.
7. Pressurize nitrogen to 550 psi and leak test all connections with a leak detection fluid. Repair any leaks found.
8. Reassemble sealed enclosures accurately. If seals are worn, replace them.
9. Install a process tube to sealed system.
10. Charge the system with the amount of refrigerant specified on the model nameplate.
this manual for charging procedures.
11. Check safety equipment before putting into service.
65
R-32 SEALED SYSTEM REPAIR
Refer to the refrigerant removal, recovery, and evacuation
Refer to the refrigerant charging section of
section of this
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