Lennox XP14 Elite Series Installation Instructions Manual page 8

A IMPORTANT
If the XP14 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 XP14 system, refer
to the following section that 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 3 or use
field-fabricated refrigerant lines. Refer to Refrigerant
Piping Guide (Corp. 9351-L9) for proper size, type, and
application of field-fabricated lines. Valve sizes are also
listed in table 3.
REFRIGERANT LINE CONNECTIONS - XP14
OUTDOOR UNIT MATCHED WITH NEW INDOOR
COIL AND LINE SET
If replacing an existing coil equipped with a liquid line
functioning as a metering orifice, replace the liquid line
prior to installing the XP14 unit. Line sets are described in
table 3.
Model
Table 3. Refrigerant Line Sets
Valve 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 ram) (29 ram)
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. L15-65
(10 7/8 in
mm) (22 mm) 15 ft, - 50 ft.
(4.6 m - 15 m)
3/8 in, 1-1/8 in. Field
(10 (29 mm) Fabricated
mm)
NOTE - When installing refrigerant lines, refer to Lennox
Refrigerant Piping Guide (Corp. 9351-L9) or Lennox
Technical Support Department Product Appficafions
Group for assistance. In addition, be sure to consider the
following points:
• Select line set diameters from table 3 to ensure that oil
returns to the compressor.
• Unitsaredesignedforlinesetsofupto50feet(15m);
for longer line sets, consult piping guidelines.
• Size vertical vapor riser to maintain minimum velocity
at minimum capacity.
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 14 shows how to place
the outdoor unit and line set,
Install unit _ \_\
away from //
windows _
zz'.11111 I I I I I I I IIIrb---.
will reduce line set vibration.
Figure 14. Outside Unit Placement
2. Line Set Isolation--The following illustrations
demonstrate procedures which ensure proper
refrigerant line set isolation.
• Figure 15 on page 9 shows how to install line sets
on horizontal runs.
• Figure 16 on page 9 shows how to install line sets
on vertical runs.
• Figure 17 on page 10 shows how to make a
transition from horizontal to vertical
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