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Accumulators0 pages
HORIZONTAL SUCTION
Line Accumulators
Selection of a suction line accumulator should be made on
the basis of the following three capabilities. The accumulator should have an adequate liquid holding capacity, which
can vary with the system. Normally this should not be less
than 50% of the system charge. If possible this value
should be checked based on actual tests. A second consideration should be the ability of the accumulator to perform
without adding excessive pressure drop to the system. The
recommended maximum tonnages shown in the following
tables are based on a pressure drop equivalent to 1⁄2°F.
These ratings are those of the accumulator, based on oil
return through the accumulator, and will be modified by the
length of the suction line and compressor displacement.
Minimum tonnage is the lowest flow that will insure proper
oil return. Finally an accumulator should have the capability
of returning liquid at the proper rate and under a range of
load conditions. Accumulators should have a Heat Element
added on low temperature applications (O°F and below)
such as the S-9111 or S-9112 (see page 99) to help boil off
liquid refrigerant and raise the oil temperature to help facilitate oil flow. Accumulators may be insulated to prevent condensation or frost on the outside of the shell.
The refrigeration compressor is designed to compress
vapor only. A suction line accumulator prevents compressor
damage from a sudden surge of liquid refrigerant and oil
which could enter the compressor from the suction line. The
suction line accumulator is a temporary reservoir for this
mixture, designed to meter both the liquid refrigerant and oil
back to the compressor at an acceptable rate. This prevents damage to the reed valves, pistons, rods, and
crank shafts. Accumulators range in size from 4" to 123⁄4"in
diameter. All vessels over 6" inside diameter are designed
and manufactured in accordance with Section Vlll of the
ASME Code and are marked with the U or UM Code symbol. Accumulators 6" outside diameter and under are
copper brazed or welded, UL listed, and equipped with
copper or copper plated fittings. All our accumulators feature a rust resistant finish which meets a 500 hour salt
spray test. This is important to suction line accumulators,
where moisture and condensation can result in excessive
corrosion. Accumulators have a metering ejector device
that picks up liquid, vaporizes it, and returns it to the compressor. This prevents liquid slugging and controls oil return. Vertical accumulators protect the return orifice with a
screen assembly, and also feature a fusible relief device in
the S-7000 Series.
Catalog
Number
Size
Conn.
ODS
S-7615
1 5/8
Dimensions
in Inches
Refrigerant Recommended Tons Refrigeration at Suction Evaporating
Temperature (°F)
R-134a
R-22
R-404a / R-507
B
C
R134a
R22
R404a/R507
+40°
+20°
0°
+40°
+20°
0°
+40°
+20°
0°
6
28
21.5
23.3
21.3
19.3
15
10
6.25
29
20
20
12.5
19
11.5
S-7621
2 1/8
6
2 5/8
6
®
Refrigerant Holding Cap.
(Lbs. 0°F sat.)
A
S-7625
COMPONENTS
Liquid accumulators of this design should not be used when
the temperature of the liquid refrigerant is less than +15°F in
the accumulator. These accumulators have a 1⁄2" FPT connection for liquid injection and a 3⁄4" FPT connection for hot
gas bypass. These connections can also be used for a relief
device as required by UL 207.
36.75 30.25
50
43.5
31.6
29
26.2
28.6
19.5
12.5
50
30
30
25
33.2
22.9
46.7
42.6
38.6
50
35
23
95
95
65
45
61.7
41.2
Industrial & Commercial Refrigeration Products 800.96.HENRY
R22
