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DO NOT LOCATE THE UNIT:
•
On brick, concrete blocks or unstable surfaces
•
Near clothes dryer exhaust vents
•
Near sleeping area or near windows
•
Under eaves where water, snow or ice can fall directly
on the unit
•
With clearance less than 2 ft. from a second unit
•
With clearance less than 4 ft. on top of unit
Refrigerant Piping
Charging information is given on the charging procedure
sticker on the unit access panel. For more in-depth
information, consult the Service Manual or contact Tech
Service at (800) 515-3501.
IMPORTANT
Polyvinyl ether (PVE) oil is used in the 4SCU23LX124,
36, and 48 com pressors. For installations of the
4SCU23LX unit with re frigerant lines or coils previously
charged with R410A and POE oil, Allied recommends
flushing the existing lines and coil with R410A refrigerant
to remove excess POE oil that may be in the system.
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 Service Manual will void the warranty.
The 4SCU23LX160 unit has a variable capacity scroll
compressor that uses POE oil. 4SCU23LX160 units with
refrigerant lines or coils previously charged with R410A
and POE oil, do not need to be flushed to remove the
POE oil.
•
Use only refrigerant grade copper tubes.
•
Split systems may be installed with up to 50 feet of
line set (no more than 20 feet vertical) without special
consideration (see long line set guidelines).
•
Ensure that vapor and liquid tube diameters are
appropriate to capacity of unit.
•
Run refrigerant tubes as directly as possible by
avoiding unnecessary turns and bends.
•
When passing refrigerant tubes through the wall, seal
opening with RTV or other silicon-based caulk.
•
Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, walls, and any structure.
Page 4 of 25
NOTE
•
Do not suspend refrigerant tubing from joists and
studs with a rigid wire or strap that comes in direct
contact with tubing.
•
Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
It is important that no tubing be cut or seals broken until you
are ready to actually make connections to the evaporator
and to the condenser section. DO NOT remove rubber
plugs or copper caps from the tube ends until ready to
make connections at evaporator and condenser. Under no
circumstances leave the lines open to the atmosphere for
any period of time, if so unit requires additional evacuation
to remove moisture.
Flush the existing line set per the following instructions.
Do NOT attempt to flush and re-use existing line sets
or indoor coil when the system contains contaminants
(i.e., compressor burn out).
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.
If a new line set is being installed, size the piping per Table
2.
Connections
Model
Liquid
Line
3/8 in.
-024
(10 mm)
-036
3/8 in.
(10 mm)
-048
3/8 in.
-060
(10 mm)
NOTE - Some applications may require a field-provided 7/8" to 1-1/8"
adapter.
Table 2. Refrigerant Line Set – inches (mm)
NOTE: When installing refrigerant lines longer than 50
feet, refer to the Refrigerant Piping Guidelines.
Issue 2231
CAUTION
WARNING
Valve Field
Recommended Line Set
Vapor
Liquid
Line
Line
3/4 in.
3/8 in.
(19 mm)
(10 mm)
7/8 in.
3/8 in.
(22 mm)
(10 mm)
1-1/8 in.
3/8 in.
(28 mm)
(10 mm)
Vapor
Line
3/4 in.
(19 mm)
7/8 in.
(22 mm)
1-1/8 in.
(28 mm)
508296-01
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