Section 6. Refrigerant Line Routing - Trane 4TTR3018–060 Installer's Manual

5.4 Refrigerant Line Insulation
Important: The Vapor Line must always be
insulated. DO NOT allow the Liquid Line and
Vapor Line to come in direct (metal to metal)
contact.
5.5 Reuse Existing Refrigerant Lines
CAUTION
!
L
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.
Important: For more information see publica-
tion number SS-APG006-EN.

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.
6
• Minimize the number of 90º turns.
Side View
Secure Vapor line from joists using isolators every 8 ft. Secure
Liquid Line directly to Vapor line using tape, wire, or other appro-
priate method every 8 ft.
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.
8 Feet Maximum
8 Feet Maximum
Isolation From Joist/Rafter
Vapor Line
Liquid Line
Insulation
Joist/Rafter
Isolator
Line Set
18-AC79D1-6-EN