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PLACING OUTDOOR UNIT ON SLAB
When installing a unit at grade level, the top of the slab
should be high enough above the grade so that water from
higher ground would not collect around the unit as
illustrated in figure 9.
DISCHARGE AIR
BUILDING
STRUCTURE
Figure 9. Ground Level Slab Mounting
Slab may be level or have a slope tolerance away from the
building of not more than two degrees, or two inches per 5
feet (51 mm per 1524 mm) as illustrated in figure 9.
INSTALLING OUTDOOR UNIT ON ROOF
Install the unit a minimum of six inches (152 mm) above the
roof surface to avoid ice build−up around the unit. Locate
the unit above a load bearing wall or area of the roof that
can adequately support the unit. Consult local codes for
rooftop applications.
New or Replacement Line Set
This section provides information on new installation or
replacement of existing line set. If a new or replacement
line set is not required, then proceed to Brazing
Connections on page 8.
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.
505366M 01/08
MOUNTING
SLAB
GROUND LEVEL
Page 6
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 braze connections). Use Lennox L15 (braze,
non−flare) series line set, or use field−fabricated refrigerant
lines as listed in table 2.
Table 2. Refrigerant Line Set
Field
Connections
Model
Liquid
Suction
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)
NOTE − When installing refrigerant lines longer than 50
feet,
contact
Lennox
Applications for assistance or Lennox piping manual. To
obtain the correct information from Lennox, be sure to
communicate the following points:
S
Model (13ACD) 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
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 13ACD 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 13ACD unit.
Typically a liquid line used to meter flow is 1/4" in diameter
and copper.
Recommended Line Set
Liquid
Suction
L15
Line
Line
Line Sets
3/8 in.
L15−41
3/4 in
(10
15 ft. − 50 ft.
(19 mm)
mm)
(4.6 m − 15 m)
3/8 in.
L15−65
7/8 in
(10
15 ft. − 50 ft.
(22 mm)
mm)
(4.6 m − 15 m)
3/8 in.
1−1/8 in.
Field
(10
(29 mm)
Fabricated
mm)
Technical
Support
the
evaporator
by
Product
utilizing
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