Refrigerant Piping - Lennox HSXA19 SERIES Installation Instructions Manual

Refrigerant Piping

If the HSXA19 unit is being installed with a new indoor coil
and line set, the plumbing connections should be made as
outlined in this section. If an existing line set and/or indoor
coil is going to be used to complete the HSXA19 system,
refer to the following section which includes flushing proce-
dures.
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 1 or use field-fabri-
cated refrigerant lines. Valve sizes are listed in table 1.
Table 1
Refrigerant Line Sets
Valve Size
Connections
HSXA
19 19
Liquid Vapor
Line Line
3/8 in. 7/8 in.
−024
(10 mm) (22 mm)
−036
3/8 in. 7/8 in.
−038
(10 mm) (22 mm)
3/8 in. 7/8 in.
−048
(10 mm) (22 mm)
3/8 in. 1−1/8 in.
−060
(10 mm) (29 mm)
NOTE − Units are designed for line sets of up to fifty feet
(15 m).
Recommended Line Set
L15
Liquid Vapor
Line Sets
Line Line
L15−65
3/8 in. 7/8 in.
15 ft. − 50 ft.
(10 mm) (19 mm)
(4.6 m − 15 m)
L15−65
3/8 in. 7/8 in.
15 ft. − 50 ft.
(10 mm) (22 mm)
(4.6 m − 15 m)
L15−65
3/8 in. 7/8 in.
15 ft. − 50 ft.
(10 mm) (22 mm)
(4.6 m − 15 m)
3/8 in. 1−1/8 in. Field
(10 mm) (29 mm) Fabricated
Refrigerant Piping Connections
HSXA19 Matched with New Indoor Coil and Line Set
If an existing indoor coil that was equipped with an
RFCI metering device is being replaced, the liquid line
must also be replaced prior to the installation of the
HSXA19 unit.
If refrigerant lines are routed through a wall, seal and isolate
the opening so vibration is not transmitted to the building.
Installing Refrigerant Line
During the installation of any heat pump or a/c system, it is
important to properly isolate the refrigerant lines to prevent
unnecessary vibration. Line set contact with the structure
(wall, ceiling or floor) causes some objectionable noise
when vibration is translated into sound. As a result, more
energy or vibration can be expected. Closer attention to
line set isolation must be observed.
Following are some points to consider 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 trans-
mission.
2- Line Set Isolation − The following illustrations demon-
strate procedures which ensure proper refrigerant line
set isolation. Figure 7 shows how to install line sets on
vertical runs. Figure 8 shows how to install line sets on
horizontal runs. Figure 9 shows how to make a transition
from horizontal to vertical. Finally, figure 10 shows how
to place the outdoor unit and line set.
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