Page 8
505331M 06/09
IMPORTANT
Unit Stabilizer Bracket Use (field−provided):
Always use stabilizers when unit is raised above the
factory height. (Elevated units could become
unstable in gusty wind conditions).
Stabilizers may be used on factory height units
when mounted on unstable an uneven surface.
To help stabilize an outdoor unit, some installations may
require strapping the unit to the pad using brackets and
anchors commonly available in the marketplace.
ONE BRACKET PER SIDE (MIN.); FOR EXTRA STABILITY,
2 BRACKETS PER SIDE, 2" FROM EACH CORNER.
CONCRETE SLAB − USE PLASTIC
PLASTIC ANCHOR (HOLE DRILL
1/4")PLASTIC SLAB − NO PLASTIC
ANCHOR (HOLE DRILL 1/8")
COIL
BASE PAN
CORNER POST
STABILIZING
BRACKET (18 GAUGE
METAL − 2" WIDTH;
HEIGHT AS REQ’D)
Slab Side Mounting
#10 1/2" LONG SELF−
DRILLING SHEET
METAL SCREWS
#10 1−1/4" LONG
HEX HD SCREW
AND FLATWASHER
MINIMUM 1
PER SIDE
Deck Top
Mounting
STABILIZING BRACKET
(18 GAUGE METAL − 2"
WIDTH; HEIGHT AS
REQ’D); BEND TO FORM
RIGHT ANGLE
FOR EXTRA
STABILITY
Figure 15. Installing Stabilizer Brackets
New or Replacement Line Set9
This section provides information on installation or
replacement of existing line set. If line set are not being
installed then proceed to
Brazing Connections
on page 12.
If refrigerant lines are routed through a wall, seal and
isolate the opening so vibration is not transmitted to the
building. Pay close attention to line set isolation during
installation of any HVAC system. When properly isolated
from building structures (walls, ceilings. floors), the
refrigerant lines will not create unnecessary vibration and
subsequent sounds. Also, consider the following when
placing and installing a high−efficiency air conditioner.
REFRIGERANT LINE SET
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (braze connections) to the indoor unit
coil (flare or sweat connections). Use Lennox L15 (sweat,
non−flare) series line set, or use field−fabricated refrigerant
lines as listed in Table 2.
Table 2. Refrigerant Line Set
Model
Field Connections
Recommended Line Set
Liquid
Line
Suction
Line
Liquid
Line
Suction
Line
L15 Line Set
−024
−036
−048
3/8".
(10 mm)
7/8"
(22 mm)
3/8"
(10 mm)
7/8"
(22 mm)
L15−65
15 ft. − 50 ft.
(4.6 m − 15 m)
−060
3/8".
(10 mm)
1−1/8".
(29 mm)
3/8"
(10 mm)
1−1/8"
(29 mm)
Field
Fabricated
NOTE When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, or contact Lennox Technical
Support Product Applications for assistance. To obtain the
correct information from Lennox, be sure to communicate
the following points:
S
Model (XP19) and size of unit (e.g. −060).
S
Line set diameters for the unit being installed as listed
in Table 2 and total length of installation.
S
Number of elbows and if there is a rise or drop of the
piping.
MATCHING WITH NEW OR EXISTING INDOOR COIL
AND LINE SET
The RFC1−metering line consisted of a small bore copper
line that ran from condenser to evaporator coil. Refrigerant
was metered into the evaporator by utilizing
temperature/pressure evaporation effects on refrigerant in
the small RFC line. The length and bore of the RFC line
corresponded to the size of cooling unit.
If the XP19 is being used with either a new or existing
indoor coil which is equipped with a liquid line which served
as a metering device (RFCI), the liquid line must be
replaced prior to the installation of the XP19 unit. Typically
a liquid line used to meter flow is 1/4" in diameter and
copper.
INSTALLING LINE SET
Line Set Isolation
This reference illustrates
procedures, which ensure proper refrigerant line set
isolation:
S
Installation of
line set on horizontal runs
is
illustrated in Figure 16.
S
Installation of
line set on vertical runs
is illustrated in
Figure 17.
S
Installation of a
transition from horizontal to
vertica
l is illustrated in Figure 18.
