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Polyvinyl ether (PVE) 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.
Do NOT attempt to flush and re-use existing line sets
or indoor coil when the system contains contaminants
(i.e., compressor burn out).
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)
and polyol ester (POE) oils are used in these variable-
capacity 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.
"Clean refrigerant" is any refrigerant in a system that
has not had compressor burnout. If the system has
experienced burnout, it is recommended that the
existing line set and indoor coil be replaced.
In lieu of R-410A, an industry-standard flushing agent
may also be used.
Heat Pump System (HFC410A)
•
Total equivalent length equals 180 feet (piping and all
fittings included).
NOTE: Length is general guide. Lengths may be
more or less, depending on remaining system design
factors.
508311G01 / 31-5000754
WARNING
CAUTION
NOTE
NOTE
•
Maximum linear (actual) length = 150 feet.
•
Maximum linear liquid lift = 60 feet.
NOTE: Maximum lifts are dependent on total length,
number of elbows, etc. that contribute to total pressure
drop.
•
Maximum length vapor riser = 60 feet.
•
Up to 50 Linear Feet: Use rated line sizes listed in
Table 3.
•
Between 51 and 150 Linear Feet: Crankcase heater
and nonbleed port TXV factory installed. No additional
components required. Vertical vapor riser must be
sized to the vapor riser listed in the Table 4 on systems
with line sets longer than 51 feet. Use Table 4 and
Table 5 to determine the correct liquid and vapor line
sizes.
•
Over 150 Linear Feet: not recommended.
•
Additional oil is not required for systems with line
lengths up to 150 feet.
Flush Line Sets
Flush the existing line set per the following instructions.
For more information, refer to the Installation and Service
Procedures manual.
DO NOT attempt to flush and re-use existing line sets
or indoor coil when the system contains contaminants
(i.e., compressor burn out).
For -024 and -036 units: Polyvinyl ether (PVE) oil is used
in the variable capacity rotary compressors in -024 and
-036 units. When installing these units with refrigerant
lines or coils previously charged with R410A and POE oil,
it is recommended to flush the existing lines and coil with
R410A refrigerant to remove excess POE oil that may be
in the system.
For -048 and -060 units: Polyol ester (POE) oils is used in
the variable capacity scroll compressors in -048 and -060
units. When installing these units with refrigerant lines
or coils previously charged with R410A and POE oil, the
existing lines do NOT need to be flushed to remove the
POE oil.
If a new line set is being installed, size the piping per Table
3.
Suction Traps
For systems with the outdoor unit 5 - 60 feet above the
indoor unit, one trap must be installed at the bottom of the
suction riser.
NOTE: Special consideration must be taken for line sets
over 50 feet. See Refrigerant Piping Guidelines.
Issue 2250
CAUTION
Page 5 of 26
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