Page 6
506083−01 03/08
New or Replacement Line Set
This section provides information on installation or
replacement of existing line set. If line set is not being
installed or replace then proceed to
Brazing Connections
on page 7.
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 line set 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 below.
Table 2. Refrigerant Line Set
Models
Field
Connections
Recommended Line Set
Liquid
Line
Suction
Line
Liquid
Line
Suction
Line
L15
Line Set
−036
−042
−048
3/8 in.
(10 mm)
7/8 in
(22 mm)
3/8 in.
(10
mm)
7/8 in
(22 mm)
L15−65
15 ft. − 50 ft.
(4.6 m − 15 m)
−060
3/8 in.
(10 mm)
1−1/8 in.
(29 mm)
3/8 in.
(10
mm)
1−1/8 in.
(29 mm)
Field
Fabricated
NOTE − When installing refrigerant lines longer than 50
feet, contact Lennox Technical Support Product
Applications for assistance or Lennox piping manual. To
obtain the correct information from Lennox, be sure to
communicate the following points:
Model (TSA*H4) and size of unit (e.g. −060).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
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 TSA*H4 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 TSA*H4 unit.
Typically a liquid line used to meter flow is 1/4" in diameter
and copper.
LIQUID LINE FILTER DRIER INSTALLATION
The filter drier (one is shipped with each TSA*H4 unit)
must be field installed in the liquid line between the outdoor
unit’s liquid line service valve and the indoor coil’s
expansion valve. This filter drier must be installed to
ensure a clean, moisture−free system. Failure to install the
filter drier will void the warranty. A replacement filter drier is
available from Lennox. See
Brazing Connections
on page
7 for special procedures on brazing.
OUTDOOR
UNIT
LIQUID LINE
SERVICE VALVE
LIQUID LINE
FILTER DRIER
LINE
LIQUID
LINE
BRAZE CONNECTION
POINTS
Figure 10. Typical Liquid Line Filter Drier
Installation
INSTALLING LINE SET
Line Set Isolation
This reference illustrates
procedures, which ensure proper refrigerant line set
isolation:
Installation of
line set on horizontal runs
is
illustrated in figure 11.
Installation of
line set on vertical runs
is illustrated in
figure 12.
Installation of a
transition from vertical to
horizontal
is illustrated in figure 13.
METAL
SLEEVE
STRAPPING MATERIAL
(AROUND SUCTION
LINE ONLY)
TAPE OR
WIRE TIE
WIRE TIE
(AROUND
SUCTION LINE
ONLY)
FLOOR JOIST OR
ROOF RAFTER
TAPE OR
WIRE TIE
To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
8 FEET
8 FEET
Strap the suction line to the
joist or rafter at 8 feet
intervals then strap the
liquid line to the suction line.
FLOOR JOIST OR
ROOF RAFTER
Figure 11. Refrigerant Line Set: Installing
Horizontal Runs
