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Tubing
4.5 Line Set Installation (cont.)
4.0 INSTALLATION
4.5.2 Relative Location of Indoor and Outdoor Units
4.5.2.1 Outdoor Unit Level or Near Level to Indoor Coil Line Set
ST-A1219-01-01
REFERENCE TABLE 2 FOR
MAXIMUM LENGTH LIMITATIONS
IDEALLY, LINE SET SLOPES AWAY
FROM OUTDOOR UNIT. VERIFY
SUB-COOLING PRIOR TO EXPANSION
DEVICE, INSULATED LIQUID LINE IN
UNCONDITIONED SPACE.
INSULATED VAPOR LINE FULL LENGTH
Figure 3
For applications with the outdoor unit and indoor
unit on the same level the following is required:
• Insulated liquid line in unconditioned space only.
• Vapor line should slope toward the indoor unit.
(Reference Figure 3)
• Follow the proper line sizing, maximum linear
and equivalent length, charging requirements,
and oil level adjustments spelled out in this
document.
• Verify at least 5°F [2.8°C] sub-cooling at the
indoor unit prior to expansion device.
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