22
For applications that are considered to have a long
line set with the outdoor unit below the indoor unit
the following is required:
• Non-bleed TXV or at the indoor coil or install
liquid line solenoid valve near indoor unit with
flow arrow pointing toward indoor unit.
• Refrigerant lines should be routed even with the
top of the indoor coil or an inverted trap is to be
applied (refer to above illustration).
• Insulated liquid line in unconditioned space only.
Insulated suction line full length.
• Follow the proper line sizing, maximum linear
and equivalent lengths, charging requirements,
and oil level adjustments spelled out in this
manual.
• Verify at least 5°F [2.8°C] liquid sub-cooling at
the indoor unit prior to expansion device.
• Vertical separations greater that 25’ [7.62 m] can
expect a lower sub-cooling level.
67$
OUTDOOR UNIT BELOW INDOOR SECTION LINE SET
4.5 Line Set Installation (cont.)
4.0 INSTALLATION
4.5.2.2 Outdoor Unit Below Indoor Unit
INSULATE
LIQUID LINE IN
UNCONDITIONED
SPACE FOR LONG
LINE APPLICATIONS
INSULATE SUCTION
LINE FULL LENGTH
FOR ALL APPLICATIONS
ROUTE
REFRIGERANT LINES
EVEN WITH TOP OF
COIL OR INSTALL
INVERTED TRAP.
REFERENCE TABLE 2 FOR
MAXIMUM LENGTH
LIMITATIONS
AND VERTICAL SEPARATION
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