New Or Replacement Line Set - Lennox TSA036H4N41 Installation Instructions Manual

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
Field
Connections
Models
Liquid Suction
Line Line
−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 (TSA*H4) 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 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.
506083−01 03/08
Recommended Line Set
Liquid Suction L15
Line Line Line Set
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
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.
LIQUID LINE
SERVICE VALVE
OUTDOOR
UNIT
Figure 10. Typical Liquid Line Filter Drier
INSTALLING LINE SET
Line Set
procedures, which ensure proper refrigerant line set
isolation:
S
Installation of line set on horizontal runs is
illustrated in figure 11.
S
Installation of line set on vertical runs is illustrated in
figure 12.
S
Installation of a transition from vertical to
horizontal is illustrated in figure 13.
Product
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)
utilizing
FLOOR JOIST OR
ROOF RAFTER
Figure 11. Refrigerant Line Set: Installing
Page 6
BRAZE CONNECTION
POINTS
LINE
LIQUID LINE
FILTER DRIER
Installation
Isolation This reference
8 FEET
FLOOR JOIST OR
ROOF RAFTER
8 FEET
METAL
SLEEVE
TAPE OR
Strap the suction line to the
WIRE TIE
joist or rafter at 8 feet
intervals then strap the
liquid line to the suction line.
Horizontal Runs
LIQUID
LINE
illustrates
WIRE TIE
(AROUND
SUCTION LINE
ONLY)
TAPE OR
WIRE TIE