CONNECTING REFRIGERANT PIPING LINES
CONNECTING REFRIGERANT PIPING TO OUTDOOR UNIT TOP DISCHARGE
18.12.2 Steps of Refrigerant Piping Lines Preparation Before Connections
x Do not remove protective plugs from the outdoor
unit until refrigerant piping lines are ready for
connection to outdoor unit valves.
18.12.3 Precautions During Brazing of Piping Lines To Service Valves
Precautions should be taken to prevent heat damage to service valve by wrapping a wet rag around it
as shown in below fig. Also, protect all painted surfaces, insulation, during brazing.
After brazing cool joint with wet rag.
Valve can be opened by removing the plunger cap and fully inserting a hex wrench into the stem and
backing out counter-clockwise until valve stem just touches the chamfered retaining wall.
All outdoor unit connections are copper-to-copper and should be brazed with a phosphorous-copper
alloy material such as Silfos-5 or equivalent. DO NOT use soft solder.
The outdoor units have reusable service valves on both the suction and liquid connections.
and dry system.
CAUTION
Dry nitrogen should always be supplied through the tubing while it is being brazed, because the
temperature required is high enough to cause oxidation of the copper unless an inert atmosphere is
provide. The flow of dry nitrogen should continue until the joint has
cooled. Always use a pressure regulator and safety valve to insure that only low pressure dry nitrogen
is introduced into the tubing. Only a small flow is necessary to displace air and prevent oxidation.
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