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Field refrigerant piping consists of liquid and vapor lines
from the outdoor unit to the indoor unit coil (braze
connections). Use Lennox L15 (sweat, non-flare) series
line set, or field-fabricated refrigerant line sizes as listed in
table 2.
To obtain the correct information from Lennox, be sure to
communicate the following information:
Model (EL16XC1) and size of unit (e.g. -036).
Line set diameters for the unit being installed as listed
in table 2 and total length of installation.
Number of elbows / vertical rise or drop in the piping.
IMPORTANT
Mineral oils are not compatible with HFC-410A
.
If oil
must be added, it must be a Polyol ester oil.
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 over 20 pounds.
Recommended topping-off POE oils are Mobil EAL
ARCTIC 22 CC or ICI EMKARATE
RL32CF.
WARNING
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in the low side shell and suction tubing
being pressurized. Application of a
brazing torch while pressurized may
result in ignition of the refrigerant and oil
mixture - check the high and low
pressures before unbrazing.
WARNING
When using a high pressure gas such as
dry 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).
CAUTION
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.
Table 2. Service Valve Sizes and Refrigerant Line Set Recommendations
Model
Service Valve Sizes
Recommended Line Set
Liquid Line
Suction Line
Liquid Line
Suction Line
L15 Series Line Sets
-018, -024, -030
3/8 in. (10 mm)
3/4 in. (19 mm)
3/8 in. (10 mm)
3/4 in. (19 mm)
L15-41 — 15 feet to 50 feet (4.6
meters to 15 meters)
-036, -041, -042, -047, -048
3/8 in. (10 mm)
7/8 in. (22 mm)
3/8 in. (10 mm)
7/8 in. (22 mm)
L15-65 — 15 feet to 50 feet (4.6
meters to 15 meters)
-060
3/8 in. (10 mm)
1-1/8 in. (25 mm)
3/8 in. (10 mm)
1-1/8 in. (25 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, see the Lennox Refrigerant Piping Design and Fabrication
Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance.
