Page 9
XP15 SERIES
New or Replacement Line Set
This section provides information on installation or
replacement of existing line sets. If line sets are not being
installed or replace, then proceed to
Brazing Connections
on page 11.
If refrigerant lines are routed through a wall, 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.
REFRIGERANT LINE SET
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor unit
coil (flare or sweat connections). Use Lennox L15 (sweat,
non−flare) series line sets, or use field−fabricated
refrigerant lines as listed in table 3.
MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET
IMPORTANT
Matching XP15 with a New Indoor Coil and Line
SetIf installing a new indoor coil and reusing the
existing line set that included a RFCI liquid line
(small bore liquid line used as a metering device)
then you must change to a standard size liquid line.
When installing refrigerant lines longer than 50 feet, see
the
Lennox Refrigerant Piping Design and Fabrication
Guidelines
, or contact Lennox Technical Support Product
Applications for assistance. To obtain the correct
information from Lennox, be sure to communicate the
following points:
S
Model (XP15) and size (e.g. −060) of unit.
S
Line set diameters for the unit being installed (from
table 3)
S
Number of elbows and if there is a rise or drop of the
piping.
Line sets for heat pump applications can not be installed
underground. For more information see the
Lennox
Refrigerant Piping Design and Fabrication Guidelines
, or
contact Lennox Technical Support Product Applications
for assistance.
Table 3. Refrigerant Line Sets
Model
Valve Sizes
Recommended Line Set
Liquid
Line
Vapor
Line
Liquid
Line
Vapor
Line
L15
Line Sets
−024
3/8 in.
(10 mm)
3/4 in.
(19 mm)
3/8 in
(10 mm)
3/4 in.
(19 mm)
L15−41
15 − 50 ft.
(5 − 15 m)
−030
−036
−042
3/8 in.
(10 mm)
7/8 in
(22 mm)
3/8 in.
(10 mm)
7/8in
(22 mm)
L15−65
15 − 50 ft.
(5 − 15m)
−048
−060
3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
Field
Fabricated
INSTALLING LINE SET
Line Set Isolation
This reference illustrates
procedures, which ensure proper refrigerant line set
isolation:
S
Installation of
line sets on horizontal runs
is
illustrated in figure 16.
S
Installation of
line sets on vertical runs
is illustrated
in figure 17 on page 10 .
S
Installation of a
transition from horizontal to
vertica
l is illustrated in figure 18 on page 10.
METAL
SLEEVE
STRAPPING MATERIAL
(AROUND VAPOR LINE
ONLY)
TAPE OR
WIRE TIE
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
TO HANG LINE SET FROM JOIST OR RAFTER,
USE EITHER METAL STRAPPING MATERIAL OR
ANCHORED HEAVY NYLON WIRE TIES.
8 FEET
8 FEET
STRAP THE VAPOR LINE TO THE
JOIST OR RAFTER AT 8 FEET
INTERVALS THEN STRAP THE
LIQUID LINE TO THE VAPOR LINE.
FLOOR JOIST OR
ROOF RAFTER
WIRE TIE (AROUND
VAPOR LINE ONLY
Figure 16. Refrigerant Line Sets: Installing
Horizontal Runs
