Section 6. Refrigerant Line Routing - Trane 4TTM3018 Installer's Manual

5.4 Reuse Existing Refrigerant Lines
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If using existing refrigerant lines make certain that
all joints are brazed, not soldered.
For retrofit applications, where the existing refrigerant
lines will be used, the following precautions should
be taken:
• Ensure that the refrigerant lines are the correct
size. Refer to Section 2.2 listed and Table 5.1.
• Ensure that the refrigerant lines are free of leaks,
acid, and oil.
Important: For more information see the Retrofit
Guidelines Application Guide, publication number
APP-APG011-EN or APP-APG012-EN.
Note: The manufacturer recommends installing only
approved matched indoor and outdoor systems. All
of the manufacturer's split systems are A.H.R.I. rated
only with TXV indoor systems. Some of the benefits
of installing approved matched indoor and outdoor
split systems are maximum efficiency, optimum per-
formance and the best overall system reliability.

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
18-AC78D1-6
CAUTION
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 appro-
priate 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
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