Component Replacement/Brazing - Friedrich Kuhl KCS12B10A Service Manual

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. Remove and recover refrigerant, and evacuate the system. Refer to the
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.
2. 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 ) A2L certified Electronic Leak Detector rated for detecting R-32 refrigerant.
3. Re-pipe all repairs and install all components to sealed system.
NOTE: Sealed system repairs require the installation of a liquid line drier upstream of the condenser.
NOTE: Sealed system repairs to models with a heat pump require the installation liquid line drier on the cooling liquid line.
Refer to Figure 701 for installation location of liquid line drier on unit with heat pump.
4. Purge nitrogen through the unit. at approximately 2-3 psi through the duration of the brazing process. (Nitrogen must be purging through the unit while
any brazing is being performed.)
5. Pressure test unit to 550 psi minimum and hold pressure for 30 minutes minimum. Inspect for any leaks with a leak detection fluid and repair as
required. Repeat as required until system passes leak test.
6. Triple evacuate the unit to achieve a 500 micron level.
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. Charge the system with the amount of refrigerant specified on the model nameplate.
charging procedures.
82
R-32 SEALED SYSTEM REPAIR
refrigerant removal, recovery, and evacuation section
Refer to the refrigerant charging section of this manual for
of this manual.