Refrigerant Piping - Lennox HSXA16-024 Installation Instructions Manual

Refrigerant Piping

If the HSXA16 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 HSXA16 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 2 or use field-fabri-
cated refrigerant lines. Valve sizes are listed in table 2.
Refrigerant Line Sets
Field
Connections
Mod
Liquid Vapor
Line Line
el
−024 024 3/8 in. 3/8 in. 7/8 in 7/8 in
(10 mm) (10 mm) (22 mm) (22 mm)
−036 036
−048
−060 3/8 in. 1−1/8 in.
(10 mm) (29 mm)
NOTE − When installing refrigerant lines, refer to Lennox
Refrigerant Piping Guide (Corp. 9351−L9) or Lennox
Technical Support Product Applications for assistance. In
addition, be sure to consider the following points:
S
Select line set diameters from table 2 to ensure that oil
returns to the compressor.
S
Units are designed for line sets of up to fifty feet (15 m);
for longer line sets, consult piping guidelines.
S
Size vertical vapor riser to maintain minimum velocity
at minimum capacity.
Refrigerant Line Connections HSXA16
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 HSXA16 unit.
If refrigerant lines are routed through a wall, seal and iso-
late the opening so vibration is not transmitted to the build-
ing.
Table 2
Recommended Line Set
Liquid Vapor L15
Line Line Line Sets
3/8 in. 3/8 in. 7/8 in 7/8 in L15 65 L15−65
(10 mm) (10 mm) (22 mm) (22 mm) 15 ft. 50 ft. 15 ft. − 50 ft.
(4.6 m − 15 m) (4 6
3/8 in. 1−1/8 in. Field
(10 mm) (29 mm) Fabricated
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.
Outside Unit Placement and Installation
Install unit away
from windows and
neighbors' windows
15 )
Two 90° elbows installed in line set will reduce line set vibration.
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
transmission. Figure 5 shows how to place the outdoor
unit and line set.
2. Line Set Isolation The following illustrations dem-
onstrate procedures which ensure proper refrigerant
line set isolation. Figure 6 shows how to install line sets
on horizontal runs. Figure 7 shows how to make a tran-
sition from horizontal to vertical. Figure 8 shows how
to install line sets on vertical runs.
Page 5
Figure 5
HSXA16 SERIES