Friedrich Chill Premiere Series Service Manual page 41

R-32 SEALED SYSTEM REPAIRS
Refrigerant Charging
BURN HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with a torch.
Failure to follow these procedures could
result in moderate or serious injury.
Warning:
• Ensure sufficient ventilation at the repair place.
Warning:
Ensure there are no open flame sources or hot surfaces that exceed 1200˚F in the work area.
1. Install a piercing valve to remove refrigerant from the sealed system. (Piercing valve must be removed from the system before
recharging.)
2. Recover Refrigerant in accordance with EPA regulations. (Refer to Refrigerant Removal, Recovery, and Evacuation Section)
3. Install a process tube to sealed system.
NOTE: Access valves must be removed after charging is complete to return this unit to a sealed system.
4. Evacuate the system to 1500 microns.
5. Repressurize to 50 PSI with nitrogen.
6. Evacuate the system to 1000 microns.
7. Repressurize to 50 PSI with nitrogen.
8. Evacuate the system to below 500 microns.
9. Turn off vacuum pump and confirm microns do not rise above 1000.
10. Weigh in the refrigerant charge with the property quantity of R-32 refrigerant per model nameplate.
11. Start unit, and verify performance.
12. Crimp the process tube and solder the end shut.
NOTE: EPA Section 608 regulations require that if a system is charge with flammable refrigerant it must have red markings on the
access ports.
41
WARNING
CAUTION
FREEZE HAZARD
Proper safety procedures must be followed,
and proper protective clothing must be worn
when working with liquid refrigerant.
Failure to follow these procedures could
result in minor to moderate injury.