Service Manual

29
2. Brazing
DANGER
Risk of Fire or Explosion Flammable Refrigerant Used
• Servicing shall be done by factory authorized service personnel to minimize the risk
of possible ignition due to incorrect parts or improper service.
Risque De Feu Ou D'Explosion Le Frigorigène Est Inammable
• L’entretien doit être effectué par le personnel de service autorisé par le fabricant
an de minimiser les risques d’inammation attribuables à l’installation d’une pièce
inadéquate ou à la mauvaise exécution du service.
WARNING
• Wear appropriate personal protective equipment (PPE) when servicing the
appliance.
• You must have a combustible gas leak detector in the immediate work area at all
times.
• You must have a Class B chemical re extinguisher available at all times.
• Notify all persons in the immediate area that you are working with a ammable
refrigerant.
• Do not use silver alloy or copper alloy containing arsenic.
• Be sure the area is clear of refrigerant vapor before brazing.
1) Braze/repair/replace damaged component or tting.
2) Purge with nitrogen gas for 2 min. Then braze all ttings while purging with nitrogen gas
owing at a pressure of 3 to 5 PSIG.
NOTICE
• Always install a new drier every time the sealed refrigeration system is opened.
• Do not replace the drier until after all other repair or replacement has been made.
Install the new drier with the arrow on the drier in the direction of the refrigerant
ow.
• When brazing, protect the drier by using a wet cloth to prevent the drier from
overheating. Do not allow the drier to exceed 250°F (121°C).
3) Use soap bubbles to check for leaks. Raise the pressure using nitrogen gas (190 PSIG).
Do not use any refrigerant as a mixture with pressurized air for leak testing.
4) Once leak checking is complete, release the nitrogen gas from the system.