16
Tubing
4.5.2.2 Outdoor Unit Below Indoor Coil (Long Line Set Applications)
For applications with the outdoor unit below the indoor coil, the following is required:
1. Inverted vapor-line trap (Reference Figure 9)
2. Insulated liquid line in unconditioned space only.
3. Insulated vapor line full length.
4. Follow the proper line sizing, maximum linear and equivalent length, maximum vertical separation,
charging requirements, and oil level adjustments spelled out in this document.
5. Measure pressure at the liquid line service valve and prior to expansion device. Verify that the pressure
drop is not greater than 50 PSI [345 kPa].
6. For elevations greater that 25’ [8 m] a lower subcooling can be expected.
7. Verify there is at least 5ºF [2.8ºC] of liquid subcooling at the indoor coil prior to the expansion device.
Figure 9: Long Line Liquid Line Routing
Item
Number
Descripton
1 Insulated Vapor Line Full Length
2 Inverted Trap Even With Top Of The Coil
3
Verify Liquid Subcooling Prior To Expansion Device
In The Cooling Mode
4
Insulate Liquid Line In Unconditioned Space For
Long Line Applications
5
Reference Table 6 For Maximum Length And.
Vertical Separation Limitations
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