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504954M 08/06
Refrigerant Piping
If the HPXA16 unit is being installed with a new indoor coil
and line set, the refrigerant connections should be made
as outlined in this section. If an existing line set and/or in-
door coil is going to be used to complete the HPXA16 sys-
tem, refer to the following section which includes flushing
procedures.
Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit (sweat connections) to the indoor coil
(flare or sweat connections). Use Lennox L15 (sweat, non-
flare) series line sets as shown in table 2 or use field-fabri-
cated refrigerant lines. Valve sizes are also listed in table 2.
Refrigerant Connections − HPXA16 Matched
with New Indoor Coil and Line Set
If an existing indoor coil which was equipped with an RFCI
metering device is being replaced, the liquid line must also
be replaced prior to the installation of the HPXA16 unit.
Table 2
Refrigerant Line Sets
Field
Connections
Recommended Line Set
Mod-
el
Liquid
Line
Vapor
Line
Liquid
Line
Vapor
Line
L15
Line Sets
−024
−036
−048
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)
−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
NOTE − Units are designed for line sets of up to fifty feet
(15m).
Installing Refrigerant Line
Pay close attention to line set isolation during installation of
any heat pump or a/c system. When properly isolated from
building structures (walls, ceilings. floors), the refrigerant
lines will not create unnecessary vibration and subsequent
noises. Also, consider the following when placing and
installing a high−efficiency outdoor unit:
1.
Placement
Be aware some localities are adopting
sound ordinances based on how noisy the unit is at the
neighbors’ home, not at the original installation. Install
the unit as far as possible from the property line. When
possible, do not install the unit directly outside a bed-
room window. Glass has a very high level of sound
transmission. Figure 9 shows how to place the outdoor
unit and line set.
Install unit away
from windows
Two 90° elbows installed in line set
will reduce line set vibration.
Figure 9
Outside Unit Placement and Installation
2.
Line Set Isolation
The following illustrations dem-
onstrate procedures which ensure proper refrigerant
line set isolation. Figure 10 shows how to make a tran-
sition from horizontal to vertical. Figure 11 shows how
to install line sets on vertical runs. Figure 12 shows
how to install line sets on horizontal runs.
Refrigerant Line Sets: Transition From Vertical To Horizontal
Strap Liquid Line
To Vapor Line
METAL
SLEEVE
ANCHORED
HEAVY NYLON
WIRE TIE
AUTOMOTIVE
MUFFLER-TYPE
HANGER
WALL
STUD
Figure 10
VAPOR LINE − WRAPPED
IN ARMAFLEX
Strap Liquid
Line To Va-
por Line
WALL
STUD
LIQUID LINE
METAL
SLEEVE
VAPOR LINE − WRAPPED
IN ARMAFLEX
LIQUID LINE
