Page 3 of 17 508277-01G / 31-5000716Issue 2227
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 ushed prior to installation. Take care
to empty all existing traps. Polyvinyl ether (PVE) oils
are used in 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 ush 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 Service Manual .
CAUTION - DO NOT attempt to ush and re-use existing
line sets or indoor coil when the system contains
contaminants (i.e., compressor burn out).
If a new line set is being installed, size the piping per table 2.
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.
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 exposed
to a spark or open ame, can cause re and/
or an explosion, that could result in property
damage, personal injury or death.
LIQUID LINE FILTER DRIER INSTALLATION
The provided lter drier must be eld installed in the liquid
line between the outdoor unit’s liquid line service valve
and the indoor coil’s metering device (xed orice or TXV)
as illustrated in gure 5. This lter drier must be installed
to ensure a clean, moisture-free system. Failure to install
the lter drier will void the warranty. A replacement lter
drier is available. See Brazing Connections page 6 for
special procedures on brazing lter drier connections to
the liquid line.
OUTDOOR
UNIT
LIQUID LINE
SERVICE VALVE LIQUID LINE
FILTER DRIER
LINE LIQUID
LINE
BRAZE CONNECTION POINTS
Typical Liquid Line Filter Drier Installation
FIGURE 5
TABLE 2
REFRIGERANT LINE SET – INCHES (MM)
Model Valve Size Connections Line Set Length
Liquid Line Suction Line
NS18A24TA4
3/8” (10 mm)
3/4” (19 mm)
20 ft. (6.1 m)
30ft. (9.1 m)
40 ft. (12.2 m)
50 ft. (15.2 m)
NS18A36TA4
NS18A48TA4 7/8” (22 mm)
30ft. (9.1 m)
40 ft. (12.2 m)
50 ft. (15.2 m)
NS18A60TA4 1-1/8” (29 mm) * N/A
* Some applications may require a eld-provided 1-1/8” to 7/8” adapter.
NOTE - When installing refrigerant lines longer than 50 feet, refer to Refrigerant Piping Guidelines found in the GEA HVAC Community
(Location: https://appliances.force.com/HVAC/s/) or call the HVAC Tech team at 1.866.814.3633 for additional information.
