Lennox AC13 -018 Installation Instructions Manual page 9

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Model (AC13) and size (e.g. −060) of unit.
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Line set diameters for the unit being installed (from
table 2 and total length of installation.
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Number of elbows and if there is a rise or drop of the
piping.
Table 2. Refrigerant Line Set
Valve Field
Connections
AC13
Liquid Suction
Line Line
−018
3/8" (10 3/4" (19
−024
mm) mm)
−030
−036
3/8" (10 7/8" (22
−042
mm) mm)
−048
3/8" (10 1−1/8"
−060
mm) (29 mm)
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 AC13 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 AC13 unit. Typically
a liquid line used to meter flow is 1/4" in diameter and
copper.
INSTALLING LINE SET
Line Set Isolation This
procedures, which ensure proper refrigerant line set
isolation:
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Installation of line set on horizontal runs is
illustrated in figure 15.
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Installation of line set on vertical runs is illustrated in
figure 16.
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Installation of a transition from horizontal to
vertical is illustrated in figure 17.
Recommended Line Set
Liquid Suction L15 Line
Line Line Set
L15−41
3/8" (10 3/4" (19
15 ft. − 50
mm) mm) ft. (4.6 m
− 15 m)
L15−65
3/8" (10 7/8 (22 15 ft. − 50
mm) mm)
ft. 4.6 m −
15 m)
Field
3/8" (10 1−1/8"
Fabri-
mm) (29 mm)
cated
the evaporator by
reference illustrates
TO HANG LINE SET FROM JOIST OR
RAFTER, USE EITHER METAL STRAPPING
MATERIAL OR ANCHORED HEAVY NYLON
WIRE TIES.
STRAPPING MATERIAL
(AROUND SUCTION
LINE ONLY)
Figure 15. Refrigerant Line Set: Installing Horizontal
WOOD BLOCK
BETWEEN STUDS
utilizing
NOTE − SIMILAR INSTALLATION
PRACTICES SHOULD BE USED
IF LINE SET IS TO BE INSTALLED
ON EXTERIOR OF OUTSIDE
WALL.
SUCTION LINE WRAPPED
PVC
PIPE
Figure 16. Refrigerant Line Set: Installing Vertical
Page 9
8 FEET
FLOOR JOIST OR
ROOF RAFTER
STRAP THE SUCTION LINE TO
THE JOIST OR RAFTER AT 8 FEET
METAL
INTERVALS THEN STRAP THE
SLEEVE
LIQUID LINE TO THE SUCTION
LINE.
TAPE OR
WIRE TIE
FLOOR JOIST OR
ROOF RAFTER
Runs
IMPORTANT - REFRIGERANT LINES
MUST NOT CONTACT WALL.
OUTSIDE WALL
SLEEVE
WITH ARMAFLEX
LIQUID LINE
OUTSIDE
WALL
CAULK
FIBERGLASS
INSULATION
Runs (New Construction Shown)
WIRE TIE
(AROUND
SUCTION LINE
ONLY)
TAPE OR
WIRE TIE
8 FEET
LIQUID LINE
SUCTION LINE
WIRE TIE
INSIDE WALL
STRAP
SLEEVE
WIRE TIE
WOOD BLOCK
WIRE TIE
STRAP
IMPORTANT! REFRIGERANT
LINES MUST NOT CONTACT
STRUCTURE.
AC13 SERIES