675 psig Working Pressure

High Pressure Centrifugal Oil Separators/Reservoirs

Maximum Working Pressure—675 psig

This product is designed to remove large quantities of oil at a wide range of operating capacities. Field tests have shown these oil separators to be up to 99% effective—even in high oil loading conditions. This separator/reservoir is particularly effective for use with screw compressor systems.

The oil separator portion is divided from the reservoir by an internal baffle, which protects the oil in the reservoir from the turbulent action of the oil separator. Two sight glasses provide visual indication of the oil level. It is best to maintain the oil level between the two glasses. A 3/8" ODS Rotolock valve is included for installation on the oil return port.

Select an oil separator based on the system’s tonnage under normal operating conditions. This is the capacity or compressor(s) BTUs based on the refrigerant gas at the saturated suction and condensing temperatures of the operating system. For optimum sizing, select an oil separator with a capacity closest to the system's load at the evaporating temperature. Minimum tonnage is 30% of the rated capacity.

Centrifugal Oil Separators/Reservoirs
Catalog Number ODS Conn. Size Dimensions Max. Capacity in Tons of Refrigeration Maximum Discharge (CFM) Oil Capacity
in gallons
A B C D CO2 R-410A
-20°F +40°F
OSH4-07RES 7/8 4" 33" 3" 4" 25 16 7.5 2
OSH4-11RES 1-1/8 4" 33" 3" 4" 33 21 10 2
OSH6-13RES 1-3/8 6" 33.5" 4.38" 5" 43 27 12 1.50
OSH6-15RES 1-5/8 6" 33.5" 4.5" 5" 57 35 17 1.50
OSH6-21RES 2-1/8 6" 33.5" 5.25" 5.9" 90 56 27 1.50
OSH8-21RES 2-1/8 8" 25.5" 5.41" 6" 127 79 38 2.00
OSH10-25RES 2-5/8 10" 30" 6.34" 6.5" 253 158 76 2.50
OSH12-31RES 3-1/8 12.75" 30" 7.75" 9" 393 245 118 4.00

All capacities shown for R-410A are based on 100°F condensing temperature.
All capacities shown for CO2 are based on 20°F condensing temperature.
Note: These oil separators must be used with an oil pressure reducing valve. The oil pressure will be the same as discharge pressure.

Discharge CFM Sizing Chart

Example of Use
Find the DCFM value for the refrigerant being used at the appropriate evaporating and condensing temperature. Then, multiply this value by the system tonnage at the operating conditions. Use this value to select an oil separator with the nearest maximum DCFM value to the calculated DCFM.

i.e. R-134A, 20 Tons @ 20F/110F = 1.02 DCFM. Total DCFM = 20.40 (20 tons x 1.02 DCFM)

For refrigerants and conditions not listed, see our sizing calculator Sizing Calculator or contact Westermeyer Industries for assistance.

Evaporating
Temperature
    -40°F -30°F -20°F -10°F 0°F 10°F 20°F 30°F 40°F
R-134A Condensing
Temperature		 80°F 1.60 1.56 1.52 1.48 1.45 1.42 1.39 1.36 1.33
90°F 1.44 1.40 1.37 1.33 1.30 1.27 1.24 1.22 1.19
100°F 1.31 1.27 1.24 1.21 1.17 1.15 1.12 1.09 1.07
110°F 1.20 1.17 1.13 1.10 1.07 1.04 1.02 0.99 0.97
120°F 1.11 1.08 1.04 1.01 0.98 0.95 0.93 0.91 0.88
R-22 Condensing
Temperature		 80°F 1.03 1.01 1.00 0.98 0.97 0.96 0.94 0.93 0.92
90°F 0.93 0.91 0.90 0.89 0.87 0.86 0.85 0.84 0.83
100°F 0.84 0.83 0.81 0.80 0.79 0.78 0.77 0.76 0.75
110°F 0.77 0.75 0.74 0.73 0.72 0.71 0.70 0.69 0.68
120°F 0.71 0.69 0.68 0.67 0.65 0.64 0.63 0.62 0.61
R-404A Condensing
Temperature		 80°F 1.02 1.00 0.96 0.94 0.92 0.89 0.87 0.85 0.83
90°F 0.95 0.92 0.89 0.86 0.84 0.81 0.80 0.78 0.76
100°F 0.88 0.85 0.81 0.79 0.76 0.74 0.72 0.70 0.68
110°F 0.83 0.80 0.77 0.74 0.71 0.69 0.67 0.65 0.63
120°F 0.77 0.75 0.71 0.68 0.66 0.63 0.61 0.59 0.58
R-410A Condensing
Temperature		 80°F         0.62 0.62 0.61 0.60 0.60
90°F         0.56 0.55 0.55 0.54 0.53
100°F         0.50 0.50 0.49 0.49 0.48
110°F         0.46 0.45 0.44 0.44 0.43
120°F         0.42 0.41 0.40 0.40 0.39
CO2 Condensing
Temperature		 20°F 0.37   0.37   0.37        
40°F 0.30   0.30   0.30        
60°F 0.23   0.23   0.23        

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