Page 9
13HPX SERIES
Line Set Requirements
This section provides information on: installation of new or
replacement line set.
Adding Polyol ester oil requirements
New or replacement line set installation
Using existing line set.
ADDING POLYOL ESTER OIL REQUIREMENTS
IMPORTANT
Mineral oils are not compatible with HFC−410A
.
If oil
must be added, it must be a Polyol Ester oil.
The compressor is charged with sufficient Polyol Ester oil
(POE) for line set lengths up to 50 feet. Recommend
adding oil to system based on the amount of refrigerant
charge in the system. Systems with 20 pounds or less of
refrigerant required no oil to be added.
For systems over 20 pounds − add one ounce for every five
(5) pounds of HFC−410A refrigerant.
Recommended topping−off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATE
RL32CF.
NEW OR REPLACEMENT LINE SET INSTALLATION
Field refrigerant piping consists of both liquid and vapor
lines from the outdoor unit to the indoor coil. Use Lennox
L15 (sweat, non−flare) series line set, or field−fabricated
refrigerant line sizes as specified in table 2.
If refrigerant lines are routed through a wall, then seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds. See figure 7 for recommended
installation practices.
NOTE When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351−L9, or contact
Lennox Technical Support Product Applications for
assistance. To obtain the correct information from Lennox,
be sure to communicate the following information:
Model (13HPX) and size of unit (e.g. −036).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
Number of elbows vertical rise or drop in the piping.
USING EXISTING LINE SET
Things to consider:
Liquid line that meter the refrigerant, such as RFC1
liquid line,
must not
be used in this application.
Existing line set of proper size as listed in table 2 may
be reused.
If system was previously charged with HCFC−22
refrigerant, then existing line set must be flushed (see
Flushing Line Set and Indoor Coil
on page 14).
If existing line set is being used, then proceed to
Brazing
Connections
on page 11.
IMPORTANT
Lennox highly recommends changing line set when
converting the existing system from HCFC−22 to
HFC−410A
.
If that is not possible and the line set is the
proper size as reference in table 2, use the procedure
outlined under
Flushing Line Set and Indoor Coil
on page
13.
IMPORTANT
If this unit is being matched with an approved line set
or indoor unit coil which 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 flushed prior to installation. Take
care to empty all existing traps. Polyol ester (POE) oils
are used in Lennox 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 the system
performance and capacity.
Failure to properly flush the system per the
instructions below will void the warranty.
Table 2. Refrigerant Line Set Inches (mm)
Model
Field Connections
Recommended Line Set
Liquid Line
Vapor Line
Liquid Line
Vapor Line
L15 Line Sets
13HPX−018−230
3/8 in. (10 mm)
3/4 in. (19 mm)
3/8 in. (10 mm)
3/4 in. (19 mm)
L15−41 15 ft. − 50 ft. (4.6 m − 15 m)
13HPX−024−230
13HPX−030−230
13HPX−036−230
13HPX−042−230
3/8 in. (10 mm)
7/8 in. (22 mm)
3/8 in. (10 mm)
7/8 in. (22 mm)
L15−65 15 ft. − 50 ft. (4.6 m − 15 m)
13HPX−048−230
13HPX−060−230
3/8 in. (10 mm)
1−1/8 in. (29 mm)
3/8 in. (10 mm)
1−1/8 in. (29 mm)
Field Fabricated
NOTE Some applications may required a field provided 7/8" to 1−1/8" adapter
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