5
Figure 10
CAUTION:
If using existing refrigerant lines make certain that all joints are
brazed, not soldered.
Take precautions to prevent noise within the building structure
due to vibration transmission from the refrigerant lines. For
example:
The manufacturer recommends installing only approved matched
indoor and outdoor systems. All of the manufacturer’s split
systems are AHRI certified. Some of the benefits of installing
approved matched indoor and outdoor split systems are maximum
efficiency, optimum performance and the best overall system
reliability.
Comply with National, State, and Local Codes when isolating line
sets from joists, rafters, walls or other structural elements.
Figure 11
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.
Use PVC piping as a conduit for all underground
installations as
shown
in Figure 15. Buried lines should be keep as short as
possible.
The lines should not obstruct service access to the coil, air
handling system or filter.
Care must also be taken to isolate the refrigerant lines to
minimize noise transmission from the equipment to the
structure.
Isolation From Joist/Rafter
Side View
8 Feet Maximum
Joist/Rafter
Isolator
Line Set
8 Feet Maximum
Secure Suction line from joists using isolators every 8 feet. Secure
Liquid Line directly to Suction line using tape, wire, or other
appropriate method every 8 feet.
Figure 12
6. Refrigerant line routing
6.1 Precautions
5.5 Reuse existing refrigerant lines
Ensure that the refrigerant lines are the correct size. Refer to
Section 5.1 listed and Table 3.
Ensure that the refrigerant lines are free of leaks, acid, and oil.
For retrofit applications, where the existing refrigerant lines will be used,
the following precautions should be taken:
