506859-01
Issue 1236
Page 7 of 32
Installing Refrigerant Line
During the installation of an air conditioning system, it is
important to properly isolate the refrigerant line to prevent
unnecessary vibration. Line set contact with the structure
(wall, ceiling, or floor) may cause objectionable noise when
vibration is translated into sound. As a result, more energy
or vibration can be expected. Close attention to line set
isolation must be observed.
If this unit is being matched with an approved line set
or indoor coil which was previously charged with R-22
refrigerant, the line set and coil must be flushed prior to
installation. If the unit is being used with and existing indoor
coil which was equipped with a liquid line which served as
a metering device (RFCI), the liquid line must be replaced
prior to the installation of the 4SCU16/18LS unit.
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections).
Select line set diameters from Table 2 to ensure that oil
returns to the compressor. Size vertical suction riser
to maintain minimum velocity at minimum capacity.
Recommended line length is 50’ or less. If more than 50’ line
set is required, contact Technical Services. Table 2 shows
the diameters for line sets up to 100’ although vertical lift
applications and trapping requirements need to be reviewed
with Technical Services for line sets over 50’.
Figure 8
When flushing existing line set and/or indoor coil, be sure
to empty all existing traps. Residual mineral oil can act
as an insulator, preventing proper heat transfer. It
can also clog the thermal expansion valve, reducing
system performance and capacity. Failure to properly
flush system as explained in these instructions will void
warranty.
CAUTION
To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
Strapping Material
(around vapor line only)
8
’
8
’
Tape or Wire Tie
Strap the vapor line to the joist or rafter
at 8 intervals then strap the liquid line
to the vapor line.
’
Floor Joist or
Roof Rafter
Metal Sleeve
Floor Joist or Roof Rafter
Tape or Wire Tie
Wire Tie
(around vapor line only)
Refrigerant Line Sets : Installing Horizontal Runs
Summary of Contents for 4SCU 16LS Series
Page 8: ...506859 01 Issue 1236 Page 8 of 32 Figure 9 Figure 10 ...
Page 19: ...506859 01 Issue 1236 Page 19 of 32 Figure 14 CONTROL BOARD ...
Page 25: ...506859 01 Issue 1236 Page 25 of 32 ...
Page 29: ...506859 01 Issue 1236 Page 29 of 32 4SCU16LS124 160 Wire Diagram ...
Page 30: ...506859 01 Issue 1236 Page 30 of 32 4SCU18LS124 160 Wiring Diagram ...