Lennox HP13 Series Installation Instructions Manual page 8

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-fabricated refrigerant lines,
Refer to Refrigerant Piping Guide (Corp. 9351-L9) for
proper size, type, and application of field-fabricated lines.
Field connection sizes are also listed in table 2.
Model
Table 2. Refrigerant Line Sets
Field
Connections
Liquid Vapor
Line Line
-018
3/8 in. 3/4 in
-024 (10 mm) (19 mm)
-030
-036
3/8 in. 7/8 in
-042 (10 mm) (22 mm)
-048
3/8 in, 1-1/8 in.
-060 (10 mm) (29 mm)
Recommended Line Set
Liquid Vapor L15
Line Line Line Sets
3/8 in. 3/4 in L15-41
(10 (19 mm) 15 ft, - 50 ft.
mm) (4.6 m - 15 m)
3/8 in. 7/8 in L15-65
(10 (22 mm) 15 ft, - 50 ft.
mm) (4.6 m - 15 m)
3/8 in, 1-1/8 in. Field
(10 (29 mm) Fabricated
mm)
NOTE - Units are designed for line sets of up to fifty feet (15
m). For applications longer than fifty feet, consult the
Lennox Refrigerant Piping Guide (Corp. 9351-L9). Select
line set diameters from table 2 to ensure that oil returns to
the compressor.
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--Some localities are adopting sound
ordinances based on the unit's noise level observed
from the adjacent property, not from the installation
property. Install the unit as far as possible from the
property line. When possible, do not install the unit
directly outside a window. Glass has a very high level
of sound transmission. Figure 13 shows how to place
the outdoor unit and line set.
Install unit /
away from J
windows
Two 90 ° elbows installed in line set
will reduce line set vibration.
Figure 13. Outside Unit Placement and Installation
2. Line Set Isolation--The following illustrations
demonstrate procedures which ensure proper
refrigerant line set isolation. Figure 14 shows how to
install line sets on horizontal runs. Figure 15 shows
how to install line sets on vertical runs. Figure 16
shows how to make a transition from horizontal to
vertical.
To hang line set from joist or rafter,
use either metal strapping material
or anchored WIRE TIE
(Around vapor
STRAPPING MATERIAL
(Around vapor line only)
8 FEET TAPE OR
WIRE TIE
METAL
SLEEVE Strap the vapor line to the joist or
TAPE OR rafter at 8 feet intervals then strap
WIRE TIE the liquid line to the vapor line.
ROOF RAFTER _ --
q Ill II
Figure 14. Refrigerant Line Sets: Installing
Horizontal Runs
505076M 06/07
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