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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) 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 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 Service Manual .
CAUTION - DO NOT attempt to flush 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.
Model
NS18A24TA4
NS18A36TA4
NS18A48TA4
NS18A60TA4
* Some applications may require a field-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.
Page 3 of 17
TABLE 2
REFRIGERANT LINE SET – INCHES (MM)
Valve Size Connections
Liquid Line
3/8" (10 mm)
Issue 2227
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 flame, can cause fire and/
or an explosion, that could result in property
damage, personal injury or death.
LIQUID LINE FILTER DRIER INSTALLATION
The provided filter drier must be field installed in the liquid
line between the outdoor unit's liquid line service valve
and the indoor coil's metering device (fixed orifice or TXV)
as illustrated in figure 5. This filter drier must be installed
to ensure a clean, moisture-free system. Failure to install
the filter drier will void the warranty. A replacement filter
drier is available. See Brazing Connections page 6 for
special procedures on brazing filter drier connections to
the liquid line.
Typical Liquid Line Filter Drier Installation
LIQUID LINE
LINE
SERVICE VALVE
OUTDOOR
UNIT
FIGURE 5
Suction Line
3/4" (19 mm)
7/8" (22 mm)
1-1/8" (29 mm) *
BRAZE CONNECTION POINTS
LIQUID
LINE
LIQUID LINE
FILTER DRIER
Line Set Length
20 ft. (6.1 m)
30ft. (9.1 m)
40 ft. (12.2 m)
50 ft. (15.2 m)
30ft. (9.1 m)
40 ft. (12.2 m)
50 ft. (15.2 m)
N/A
508277-01G / 31-5000716
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