New Or Replacement Line Set - Lennox EL23XCV Series Manual

New or Replacement Line Set

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 installation. Take care to
empty all existing traps. Polyvinyl ether (PVE) and polyol
ester (POE) oils are used in Lennox variable-capacity
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 system performance and capacity. Failure
to properly flush the system per this instruction and the
detailed Installation and Service Procedures manual will
void the warranty.
Flush the existing line set per the following instructions.
For more information, refer to the Installation and Service
Procedures manual available on LennoxPros.com. CAU-
TION - DO NOT attempt to flush and re-use existing line
sets or indoor coil when the system contains contaminants
(i.e., compressor burn out).
Polyvinyl ether (PVE) oil is used in the EL23XCV-024,
-036, and -048 with rotary compressors. For installations
of the EL23XCV-024, -036, and -048 units with refriger-
ant lines or coils previously charged with R410A and POE
oil, Lennox recommends flushing the existing lines and
coil with R410A refrigerant to remove excess POE oil that
may be in the system. The EL23XCV-060 air conditioners
have variable capacity scroll compressors that use POE
oil. EL23XCV-060 units with refrigerant lines or coils pre-
viously charged with R410A and POE oil, do not need to
be flushed to remove the POE oil.
If a new line set is being installed, size the piping per table 2.
TABLE 2
REFRIGERANT LINE SET – INCHES (MM)
Valve Field
Connections
Model
Liquid Vapor
Line Line
3/8 in. 3/4 in.
-024
(10 mm) (19 mm)
-036
3/8 in. 7/8 in.
(10 mm) (22 mm)
-048
3/8 in. 1-1/8 in.
-060
(10 mm) (28 mm)
NOTE - Some applications may require a field-provided 7/8" to
1-1/8" adapter.
NOTE - When installing refrigerant lines longer than 50
feet, refer to the Refrigerant Piping Design and Fabrica-
tion Guidelines manual available on LennoxPros.com
(Corp. 9351-L9), or contact the Technical Support Depart-
ment Product Application group for assistance.
Recommended Line Set
Liquid Vapor
L15 Line Sets
Line Line
L15-41
3/8 in. 3/4 in.
15 ft. - 50 ft.
(10 mm) (19 mm)
(4.6 m - 15 m)
L15-65
3/8 in. 7/8 in.
15 ft. - 50 ft.
(10 mm) (22 mm)
(4.6 m - 15 m)
3/8 in. 1-1/8 in.
Field Fabricated
(10 mm) (28 mm)
NOTE - For new or replacement line set installation, refer
to Service and Application Note - Corp. 9112-L4 (C-91-4).
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).
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.
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 exposed
to a spark or open flame, can cause fire and/
or an explosion, that could result in property
damage, personal injury or death.
Polyvinyl ether (PVE) 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.
The EL23XCV is a variable-capacity cooling system uti-
lizing variable speed compressor technology. With the
variable speed compressor and variable pumping capac-
ity, additional consideration must be given to refrigerant
piping sizing and application. The guidelines below are to
be used exclusively for the EL23XCV systems.
COOLING SYSTEM (HFC410A)
• Total equivalent length equals 180 feet (piping and all
fittings included).
NOTE – Length is general guide. Lengths may be more or
less, depending on remaining system design factors.
• Maximum linear (actual) length = 150 feet.
• Maximum linear liquid lift = 60 feet.
NOTE – Maximum lifts are dependent on total length,
number of elbows, etc. that contribute to total pressure
drop.
• Maximum length vapor riser = 60 feet.
• Up to 50 Linear Feet: Use rated line sizes listed in table
1.
Page 14
WARNING
WARNING
WARNING
WARNING