Section 6. Refrigerant Line Routing - Trane 4TWR7 Installer's Manual

5.5 Reuse Existing Refrigerant Lines
CAUTION
If using existing refrigerant lines make certain that
all joints are brazed, not soldered.
For retrofit applications, where the existing
indoor evaporator coil and/or refrigerant lines
will be used, the following precautions should
be taken:
• Ensure that the indoor evaporator coil and
refrigerant lines are the correct size.
• Ensure that the refrigerant lines are free of
leaks, acid, and oil.

Section 6. Refrigerant Line Routing

6.1 Precautions
Important: Take precautions to prevent noise
within the building structure due to vibration
transmission from the refrigerant lines.
For Example:
• When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type
hangers.
• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
• Isolate the lines from all ductwork.
• Minimize the number of 90º turns.
Side View
8
8 Feet Maximum
Secure Vapor line from joists using isolators every 8 ft. Secure Liquid
Line directly to Vapor line using tape, wire, or other appropriate method
every 8 ft.
Isolation From Joist/Rafter
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.
8 Feet Maximum
Joist/Rafter
Isolator
Line Set
18-BC90D1-4A-EN