Page 3
IMPORTANT
If this unit is being matched with an approved line set
or indoor unit coil that was previously charged with
mineral oil, or if it is being matched with a coil which
was manufactured before January of 1999, the coil
and line set must be ushed prior to installation. Take
care to empty all existing traps. Polyvinyl ether (PVE)
oils are used in Lennox variable-capacity units charged
with HFC-410A refrigerant. Residual mineral oil can
act as an insulator, preventing proper heat transfer. It
can also clog the expansion device and reduce system
performance and capacity. Failure to properly ush the
system per this instruction and the detailed Installation
and Service Procedures manual will void the warranty.
Flush the existing line set per the following instructions.
For more information, refer to the Installation and Ser-
vice Procedures manual available on LennoxPros.com.
CAUTION - DO NOT attempt to ush and re-use existing
line sets or indoor coil when the system contains contam-
inants (i.e., compressor burn out).
If a new line set is being installed, size the piping per table 2.
WARNING
When using a high pressure gas such as
nitrogen to pressurize a refrigeration or air
conditioning system, use a regulator that can
control the pressure down to 1 or 2 psig (6.9
to 13.8 kPa).
WARNING
Polyol ester (POE) oils used with HFC-410A refrigerant
absorb moisture very quickly. It is very important that the
refrigerant system be kept closed as much as possible.
DO NOT remove line set caps or service valve stub caps
until you are ready to make connections.
WARNING
Fire, Explosion and Personal Safety hazard.
Failure to follow this warning could result in
damage, personal injury or death.
Never use oxygen to pressurize or purge
refrigeration lines. Oxygen, when exposed
to a spark or open ame, can cause re and/
or an explosion, that could result in property
damage, personal injury or death.
LIQUID LINE FILTER DRIER INSTALLATION
The provided lter drier must be eld installed in the liq-
uid line between the outdoor unit’s liquid line service valve
and the indoor coil’s metering device (xed orice or TXV)
as illustrated in gure 5. This lter drier must be installed
to ensure a clean, moisture-free system. Failure to install
the lter drier will void the warranty. A replacement lter
drier is available from Lennox. See Brazing Connections
page 6 for special procedures on brazing lter drier con-
nections to the liquid line.
OUTDOOR
UNIT
LIQUID LINE
SERVICE VALVE
LIQUID LINE
FILTER DRIER
LINE
LIQUID
LINE
BRAZE CONNECTION POINTS
Typical Liquid Line Filter Drier Installation
FIGURE 5
TABLE 2
REFRIGERANT LINE SET – INCHES (MM)
Model Number
Valve Size Connections Recommended Line Sets
Liquid Line Suction Line
L15 Line Set
Model
Line Set Length Catalog Number
ML17XC1-018-230
ML17XC1-024-230
ML17XC1-030-230
3/8” (10 mm) 3/4” (19 mm)
L15-41-20 20 feet (6.1 m) 89J56
L15-41-30 30 feet (9.1 m) 89J57
L15-41-40 40 feet (12.2 m) 89J58
L15-41-50 50 feet (15.2 m) 89J59
ML17XC1-036-230
ML17XC1-041-230
ML17XC1-042-230
ML17XC1-047-230
ML17XC1-048-230
3/8” (10 mm) 7/8” (22 mm)
L15-65-30 30 feet (9.1 m) 89J60
L15-65-40 40 feet (12.2 m) 89J61
L15-65-50 50 feet (15.2 m) 89J62
ML17XC1-060-230 3/8” (10 mm) 1-1/8” (29 mm) * Field-fabricated N/A N/A
* Some applications may require a field-provided 1-1/8” to 7/8” adapter.
NOTE - When installing refrigerant lines longer than 50 feet, refer to the Refrigerant Piping Design and Fabrication Guidelines manual
available on LennoxPros.com (Corp. 9351-L9), or contact the Technical Support Department Product Application group for assistance.
NOTE - For new or replacement line set installation, refer to Service and Application Note - Corp. 9112-L4 (C-91-4).
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