Page 3
14ACX SERIES
IMPORTANT !
If this unit is being matched with an approved line
set or indoor unit coil that was previously charged
with mineral oil, or if it is being matched with a coil
which was manufactured before January of 1999,
the coil and line set must be flushed prior to installa
tion. Take care to empty all existing traps. Polyol es
ter (POE) oils are used in Lennox units charged with
HFC-410A refrigerant. Residual mineral oil can act
as an insulator, preventing proper heat transfer. It
can also clog the expansion device and reduce sys
tem performance and capacity.
Failure to properly flush the system per this instruc
tion and the detailed Installation and Service Proce
dures manual will void the warranty.
WARNING
Fire, Explosion and Personal Safety
Hazard. Failure to follow this warning
could result in damage, personal injury or
death.
Never use oxygen to pressurize or purge
refrigeration lines. Oxygen, when ex
posed to a spark or open flame, can
cause fire and/or an explosion, that could
result in property damage, personal inju
ry or death.
WARNING
When using a high pressure gas such as
nitrogen to pressurize a refrigeration or air
conditioning system, use a regulator that
can control the pressure down to 1 or 2 psig
(6.9 to 13.8 kPa).
WARNING
Polyol ester (POE) oils used with HFC-410A refrigerant
absorb moisture very quickly. It is very important that
the refrigerant system be kept closed as much as
possible. DO NOT remove line set caps or service valve
stub caps until you are ready to make connections.
IMPORTANT !
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction pres
sure goes below 20 psig. A hissing sound will be
heard when the compressor is running unloaded.
The protector will reset when low pressure rises
above 40 psig. DO NOT REPLACE COMPRESSOR.
LIQUID LINE FILTER DRIER INSTALLATION
The provided filter drier must be field installed in the liquid
line between the outdoor unit's liquid line service valve and
the indoor coil's metering device (fixed orifice or TXV) as
illustrated in figure 5. 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
page 6
for special procedures on brazing filter drier connections to
the liquid line.
OUTDOOR
UNIT
LIQUID LINE
SERVICE VALVE
LIQUID LINE
FILTER DRIER
LINE
LIQUID
LINE
BRAZE CONNECTION POINTS
FIGURE 5
Typical Liquid Line Filter Drier Installation
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal injury
or death.
NOTE
- When installing refrigerant lines longer than 50
feet, refer to the Refrigerant Piping Design and Fabrication
Guidelines manual available on LennoxPros.com (Corp.
9351-L9), or contact the Technical Support Department
Product Application group for assistance.
TABLE 2. REFRIGERANT LINE SET — INCHES (MM)
Model Number (-xx*)
Valve Size Connections
Recommended Line Sets
Liquid Line
Suction Line
L15 Line Set Model
Line Set Length
Catalog Number
14ACX-018-230AXX
14ACX-024-230AXX
14ACX-030-230AXX
3/8” (10 mm)
3/4” (19 mm)
L15-41-20
20 feet (6.1 m)
89J56
L15-41-30
30 feet (9.1 m)
89J57
L15-41-40
40 feet (12.2 m)
89J58
L15-41-50
50 feet (15.2 m)
89J59
14ACX-036-230AXX
14ACX-041-230-XX
14ACX-042-230AXX
14ACX-047-230-XX
14ACX-048-230-XX
3/8” (10 mm)
7/8” (22 mm)
L15-65-30
30 feet (9.1 m)
89J60
L15-65-40
40 feet (12.2 m)
89J61
L15-65-50
50 feet (15.2 m)
89J62
14ACX-059-230-XX
14ACX-060-230-XX
3/8” (10 mm)
1-1/8” (29 mm) **
Field-fabricated
N/A
N/A
* Applicable to all minor revision numbers unless otherwise specified.
** Some applications may require a field-provided 1-1/8” to 7/8” adapter.
