17
4.0 INSTALLATION
Tubing
4.5.2.2 Outdoor Unit Below Indoor Coil (Long Line Set Applications)
ST-A1219-02-01
REFERENCE TABLE 2 FOR
MAXIMUM LENGTH AND VERTICAL
SEPARATION LIMITATIONS
VERIFY LIQUID SUBCOOLING
PRIOR TO EXPANSION DEVICE
IN THE COOLING MODE.
INVERTED TRAP
EVEN WITH TOP
OF THE COIL
INSULATED SUCTION LINE FULL LENGTH
INSULATE LIQUID LINE
IN UNCONDITIONED
SPACE FOR LONG
LINE APPLICATIONS
Figure 4
For applications with the outdoor unit below the indoor
coil, the following is required:
•
Inverted suction-line trap (Reference Figure 4).
•
Insulated liquid line in unconditioned space only.
•
Follow the proper line sizing, maximum linear and
equivalent length, maximum vertical separation,
charging requirements, and oil level adjustments
spelled out in this document.
•
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].
•
For elevations greater that 25’ [8 m] a lower subcool
-
ing can be expected.
•
Verify there is at least 5ºF [2.8ºC] of liquid subcool
-
ing at the indoor coil prior to the expansion device.
