Brazing Connections
Use the procedures outline in figures 9 and 10 for brazing line set connections to service valves.
WARNING
Polyol Ester (POE) oils used with HFC−410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.
WARNING
Danger of fire. Bleeding the refrigerant charge from only the high side may result in pressurization of the low side shell and suction tubing. Application of a brazing torch to a pressurized system may result in ignition of the refrigerant and oil mixture − Check the high and low pressures before applying heat.
CAUTION
Brazing alloys and flux contain materials which are hazardous to your health.
Avoid breathing vapors or fumes from brazing operations. Perform operations only in well−ventilated areas.
Wear gloves and protective goggles or face shield to protect against burns.
Wash hands with soap and water after handling brazing alloys and flux.
IMPORTANT
Allow braze joint to cool before removing the wet rag from the service valve. Temperatures above 250ºF can damage valve seals.
IMPORTANT
Use silver alloy brazing rods with 5% minimum silver alloy for copper−to−copper brazing. Use 45% minimum alloy for copper−to−brass and copper−to−steel brazing.
WARNING
Fire, Explosion and Personal Safety
Hazard.
Failure to follow this warning could result in damage, personal injury or death.
Never use oxygen to pressurize or purge refrigeration lines. Oxygen, when exposed to a spark or open flame, can cause fire and/or an ex- plosion, that could result in property damage, personal injury or death.
WARNING
When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).
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