20
4.5.3 Tubing Connections
Indoor coils have only a holding charge of
dry nitrogen. Keep all tube ends sealed until
connections are to be made.
• Use type “L” copper refrigeration tubing. Braze
the connections with the following alloys:
– copper to copper, 5% silver minimum
– copper to steel or brass, 15% silver minimum
• Be certain both refrigerant shutoff valves at the
outdoor unit are closed.
• Remove the caps and Schrader cores from the
pressure ports to protect seals from heat damage.
Both the Schrader valves and the service valves
have seals that may be damaged by excessive
heat.
• Clean the inside of the ttings and outside of the
tubing with a clean, dry cloth before soldering.
Clean out debris, chips, dirt, etc., that enters tubing
or service valve connections.
• Wrap valves with a wet rag or thermal barrier
compound before applying heat.
• Braze the tubing between the outdoor unit and
indoor coil. Flow dry nitrogen into a pressure
port and through the tubing while brazing, but
DO NOT allow pressure inside tubing which can
result in leaks. Once the system is full of nitro-
gen, the nitrogen regulator should be turned off
to avoid pressuring the system.
• After brazing, use an appropriate heatsink material
to cool the joint.
• Reinstall the Schrader cores into both pressure
ports.
• DO NOT allow the bare suction line and liquid line
to be in contact with each other. This causes an
undesirable heat transfer resulting in capacity loss
and increased power consumption.
Tubing
4.0 INSTALLATION
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