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STEP 2 — REFRIGERANT PIPING —
Flushing Existing Line Set & Indoor Coil
lush the existing line set per the following instruc
F
tions. For more information, refer to the Installation
and Service Procedures manual available on Dave
Net. CAUTION - DO NOT attempt to flush and re-use ex
isting line sets or indoor coil when the system con
tains contaminants (i.e., compressor burn out).
NOTE - When installing refrigerant lines longer than 50
feet, refer to the Refrigerant Piping Design and Fabrication
Guidelines manual available on LennoxPros (Corp.
9351-L9), or contact the Technical Support Department
Product Application group for assistance.
NOTE - For new or replacement line set installation, refer
to Service and Application Note - Corp. 9112-L4 (C-91-4).
REFRIGERANT LINE SET — INCHES (MM)
Field
Connections
Model
Liquid
Suction
Line
Line
-036
3/8"
7/8"
(22 mm)
(10 mm)
-048
3/8"
1-1/8"
-060
(10 mm)
(29 mm)
NOTE - Some applications may require a field-provided 7/8" to 1-1/8"
adapter.
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.
TABLE 1
Recommended Line Set
Liquid
Suction
L15 Line Set
Line
Line
L15-65
3/8"
7/8"
15 ft. - 50 ft.
(22 mm)
(10 mm)
(4.6 m - 15 m)
3/8"
1-1/8"
Field-Fabricated
(10 mm)
(29 mm)
When using a high pressure gas such
as
refrigeration
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
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
when exposed to a spark or open flame,
can cause fire and/or an explosion, that
could result in property damage, per
sonal injury or death.
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.
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.
Protector will reset when low pressure in system is
raised above 40 psig. DO NOT REPLACE COM
PRESSOR.
Page 4
WARNING
nitrogen
to
pressurize
or
air
WARNING
be
used
and
WARNING
refrigeration lines. Oxygen,
WARNING
IMPORTANT !
a
conditioning
recovered
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