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Refrigerant Piping Overview
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Using the charts and illustrations found above, route the line set between the Evaporator Unit and Condensing Unit. Be sure
to reference the chart for correct line set sizing. All horizontal suction piping should be pitched toward the Condensing Unit
half an inch for every 10 feet of pipe. When installing and routing the line set, cap both ends of each tube to prevent debris
from entering the tubing.
•
Prior to connecting the piping to the Evaporator and Condensing Units, loosely connect a refrigerant manifold to the suction
and liquid line service valves.
•
Purge the hoses with dry nitrogen and tighten the hose connections.
•
Remove the service valve caps and turn the valve stem clockwise half a turn to unseat the valve and open the service
port. Keep the piping ports sealed until ready to braze.
•
Purge the fittings with dry nitrogen at a slow rate to prevent formation of highly abrasive copper oxide.
•
Perform all brazes.
•
Pressure test the system and check for leaks.
•
Insulate the suction line using wall cellular insulation or equivalent. Seal all seams with Armaflex 520 Foam Insulation
Adhesive or equivalent. Wrap each seam using line set tape.
Liquid Line Piping Procedure
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¼” OD copper tubing is required for the liquid line on all systems.
•
Braze a short piece of ¼” copper tubing to the liquid line service valve.
•
Connect the supplied refrigerant drier to the tubing.
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Downstream from the drier, connect the moisture-indicating sight glass in an easily visible location.
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Run the tubing to the Evaporator Unit (Fan Coil Unit) and attach to the liquid line connection on the Evaporator Unit (Fan Coil
Unit).
Suction Piping Procedure
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Install an access valve at the outlet of the Evaporator Unit (Fan Coil Unit).
•
Connect an appropriately sized suction line to the suction line service valve on the Condensing Unit.
•
Run the pre-insulated suction line to the Evaporator Unit (Fan Coil Unit) and attach to the suction line connection on the
Evaporator Unit (Fan Coil Unit).
INSTALLING THE CONDENSING UNIT