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Interconnecting Tubing (cont.)
• If tubing is to be run underground, it must be run
in a sealed watertight chase.
• Use care in routing tubing and do not kink or
twist. Use a good tubing bender on the vapor line
to prevent kinking.
TEMPORARY
HANGER
• Route the tubing using temporary hangers;
then straighten the tubing and install permanent
hangers. Line must be adequately supported.
• If the vapor line comes in contact with inside
walls, ceiling, or flooring, the vibration of the
vapor line in the heating mode will result in noise
inside the structure.
• Blow out the liquid and vapor lines with dry
nitrogen before connecting to the outdoor unit
and indoor coil. Any debris in the line set will end
up plugging the expansion device.
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
PERMANENT
HANGER
• 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.
ST-A1226-05-00
• Clean the inside of the fittings 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.
INSTALLATION
21
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