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New or Replacement Line Set
This section provides information on new installation or
replacement of existing line set. If a new or replacement line
set is not required, then proceed to Brazing Connections on
page .
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 piping 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 in table 4.
Table 4. Refrigerant Line Set (MM)
Field
Connections
Model
Liquid
Vapor
Line
Line
-018
3/8 in.
3/4 in
-024
(10 mm)
(19 mm)
-030
-036
3/8 in.
7/8 in
-042
(10 mm)
(22 mm)
-048
3/8 in.
7/8 in.
-060
(10 mm)
(22 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,
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 (14HPX) and size of unit (e.g. -060).
S
Line set diameters for the unit being installed as listed
in table 4 and total length of installation.
S
Number of elbows and if there is a rise or drop of the
piping.
IMPORTANT
Mineral oils are not compatible with
be added, it must be a Polyol ester oil.
Recommended Line Set
Liquid
Vapor
L15
Line
Line
Line Sets
L15-41
3/8 in.
3/4 in
15 ft. - 50 ft.
(10
(19
(4.6 m - 15
mm)
mm)
m)
L15-65
3/8 in.
7/8 in
15 ft. - 50 ft.
(10
(22
(4.6 m - 15
mm)
mm)
m)
3/8 in.
7/8 in.
Field
(10
(22
Fabricated
mm)
mm)
Technical
Support
Product
HFC-410A.
If oil must
The compressor is charged with sufficient Polyol ester oil for
line set lengths up to 50 feet. Recommend adding oil to
system based on the amount of refrigerant charge in the
system. No need to add oil in system with 20 pounds of
refrigerant or less. For systems over 20 pounds - add one
ounce for every five pounds of refrigerant.
Recommended topping-off POE oils are Mobil EAL ARCTIC
22 CC or ICI EMKARATEt RL32CF.
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
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 14HPX 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 14HPX unit. Typically a liquid
line used to meter flow is 1/4" in diameter and copper.
LINE SET ISOLATION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing operations.
Perform operations only in well ventilated areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
The Environmental Protection Agency (EPA) prohibits the
intentional
venting
maintenance, service, repair and disposal of appliance.
Approved methods of recovery, recycling or reclaiming
must be followed.
If this unit is being matched with an approved line set or
indoor unit coil which 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. Polyol ester (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 the system performance and
capacity.
Failure to properly flush the system per the instructions
below will void the warranty.
Page 15
into
the
evaporator
CAUTION
IMPORTANT
of
HFC
refrigerants
IMPORTANT
by
utilizing
during
14HPX SERIES
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