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Conventional Oil Separators
Low Pressure | MAXIMUM WORKING PRESSURE: 450 PSIG
Features
Our standard screen-style separators remove oil from refrigerant gas using three methods: velocity reduction, screen filtering, and baffling. All separated oil is then returned to the compressor crankcase or reservoir by an internal oil float valve.
Catalog Number | ODS | Dimensions | Max. Capacity (Tons of Refrigeration) | Pre-Charge | Min DCFM | Max DCFM | |||||||
R134A | R22 | R404A | |||||||||||
A | B | -40°F | +40°F | -40°F | +40°F | -40°F | +40°F | ||||||
Sealed | OS4-02 | 1/4" | 4” | 8.25" | 0.5 | 0.75 | 0.75 | 1 | 0.75 | 1 | 15 oz | 0.2 | 0.6 |
OS4-03 | 3/8" | 4" | 8.25" | 0.75 | 1 | 1 | 1.5 | 1 | 1.5 | 15 oz | 0.26 | 0.8 | |
OS4-04 | 1/2" | 4" | 10.25" | 1 | 1.5 | 1.5 | 2 | 1.5 | 2 | 15 oz | 0.5 | 1.5 | |
OS4-05 | 5/8" | 4" | 14.25" | 3 | 4 | 4.5 | 5.5 | 4 | 5.5 | 15 oz | 1.5 | 5 | |
OS4-07 | 7/8" | 4" | 17.75" | 4.5 | 5.5 | 7 | 8 | 6.5 | 8.5 | 15 oz | 2.25 | 7.5 | |
OS4-11 | 1 1/8" | 4" | 21" | 6 | 7.5 | 9 | 10.5 | 8.5 | 11 | 15 oz | 3 | 10 | |
OS4-13 | 1 3/8" | 4" | 21" | 8 | 9.5 | 10.5 | 13.5 | 10.5 | 14 | 15 oz | 3.9 | 13 | |
OS6-11 | 1 1/8" | 6" | 15.38" | 6 | 7.5 | 9 | 10.5 | 8.5 | 11 | 40 oz | 3 | 10 | |
OS6-13 | 1 3/8" | 6" | 15.38" | 8 | 9.5 | 10.5 | 13.5 | 10.5 | 14 | 40 oz | 3.9 | 13 | |
OS6-15 | 1 5/8" | 6" | 18.63" | 11 | 13 | 16 | 18 | 15 | 19 | 40 oz | 5.1 | 17 | |
OS6-21 | 2 1/8" | 6" | 18.63" | 17 | 22 | 25 | 30 | 29 | 34 | 40 oz | 6 | 20 | |
Serviceable* | W-1901 | 1 5/8" | 8" | 21" | 12 | 15 | 20 | 24 | 21 | 24 | 25 oz | 5.1 | 17 |
W-1902 | 2 1/8" | 8" | 21" | 20 | 25 | 30 | 35 | 34 | 39 | 25 oz | 8.1 | 27 | |
W-1903 | 2 5/8" | 10" | 21.5" | 30 | 40 | 50 | 65 | 59 | 69 | 25 oz | 15 | 50 | |
W-1904 | 3 1/8" | 12.8" | 25.75" | 50 | 60 | 75 | 90 | 79 | 99 | 25 oz | 21 | 70 |
Catalog Number | ODS | Dimensions | Max. Capacity (Tons of Refrigeration) | Pre-Charge | Min DCFM | Max DCFM | |||||||
R134A | R22 | R404A | |||||||||||
A | B | -40°F | +40°F | -40°F | +40°F | -40°F | +40°F | ||||||
Sealed | OS4-02 | 1/4" | 4” | 8.25" | 0.5 | 0.75 | 0.75 | 1 | 0.75 | 1 | 15 oz | 0.2 | 0.6 |
OS4-03 | 3/8" | 4" | 8.25" | 0.75 | 1 | 1 | 1.5 | 1 | 1.5 | 15 oz | 0.26 | 0.8 | |
OS4-04 | 1/2" | 4" | 10.25" | 1 | 1.5 | 1.5 | 2 | 1.5 | 2 | 15 oz | 0.5 | 1.5 | |
OS4-05 | 5/8" | 4" | 14.25" | 3 | 4 | 4.5 | 5.5 | 4 | 5.5 | 15 oz | 1.5 | 5 | |
OS4-07 | 7/8" | 4" | 17.75" | 4.5 | 5.5 | 7 | 8 | 6.5 | 8.5 | 15 oz | 2.25 | 7.5 | |
OS4-11 | 1 1/8" | 4" | 21" | 6 | 7.5 | 9 | 10.5 | 8.5 | 11 | 15 oz | 3 | 10 | |
OS4-13 | 1 3/8" | 4" | 21" | 8 | 9.5 | 10.5 | 13.5 | 10.5 | 14 | 15 oz | 3.9 | 13 | |
OS6-11 | 1 1/8" | 6" | 15.38" | 6 | 7.5 | 9 | 10.5 | 8.5 | 11 | 40 oz | 3 | 10 | |
OS6-13 | 1 3/8" | 6" | 15.38" | 8 | 9.5 | 10.5 | 13.5 | 10.5 | 14 | 40 oz | 3.9 | 13 | |
OS6-15 | 1 5/8" | 6" | 18.63" | 11 | 13 | 16 | 18 | 15 | 19 | 40 oz | 5.1 | 17 | |
OS6-21 | 2 1/8" | 6" | 18.63" | 17 | 22 | 25 | 30 | 29 | 34 | 40 oz | 6 | 20 | |
Serviceable* | W-1901 | 1 5/8" | 8" | 21" | 12 | 15 | 20 | 24 | 21 | 24 | 25 oz | 5.1 | 17 |
W-1902 | 2 1/8" | 8" | 21" | 20 | 25 | 30 | 35 | 34 | 39 | 25 oz | 8.1 | 27 | |
W-1903 | 2 5/8" | 10" | 21.5" | 30 | 40 | 50 | 65 | 59 | 69 | 25 oz | 15 | 50 | |
W-1904 | 3 1/8" | 12.8" | 25.75" | 50 | 60 | 75 | 90 | 79 | 99 | 25 oz | 21 | 70 |
All capacities shown based on 90% at 100°F condensing temperature.
*W4300-38F replacement float assembly and gasket available for serviceable oil separators.
How To Choose
Select an oil separator based on the system’s tonnage (compressor BTUs) under normal operating conditions. Choose an oil separator with the nearest capacity to the system’s load at the evaporating temperature.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Conventional Oil Separators
High Pressure | MAXIMUM WORKING PRESSURE: 675 PSIG
Features
Our standard screen-style separators remove oil from refrigerant gas using three methods: velocity reduction, screen-filtering, and baffling. All separated oil is then returned to the compressor crankcase or reservoir by an internal oil float valve.
- Welded design for higher strength
- Nitrogen tested for cleanliness
- Powder paint finish
Catalog Number | ODS | Dimensions | Max. Capacity | Pre-Charge | |
Tons of Refrigeration | |||||
A | B | R410A at +40ºF | |||
OSH4-02 | 1/4" | 4” | 8.25" | 2.5 | 15 oz |
OSH4-03 | 3/8" | 4" | 8.25" | 2.5 | 15 oz |
OSH4-04 | 1/2" | 4" | 10.25" | 3 | 15 oz |
OSH4-05 | 5/8" | 4" | 14.25" | 10 | 15 oz |
OSH4-07 | 7/8" | 4" | 17.75" | 16 | 15 oz |
OSH4-11 | 1 1/8" | 4" | 21" | 21 | 15 oz |
OSH4-13 | 1 3/8" | 4" | 21" | 23 | 15 oz |
OSH6-11 | 1 1/8" | 6" | 15.38" | 25 | 40 oz |
OSH6-13 | 1 3/8" | 6" | 15.38" | 27 | 40 oz |
OSH6-15 | 1 5/8" | 6" | 18.63" | 35 | 40 oz |
Catalog Number | ODS | Dimensions | Max. Capacity | Pre-Charge | |
Tons of Refrigeration | |||||
A | B | R410A at +40ºF | |||
OSH4-02 | 1/4" | 4” | 8.25" | 2.5 | 15 oz |
OSH4-03 | 3/8" | 4" | 8.25" | 2.5 | 15 oz |
OSH4-04 | 1/2" | 4" | 10.25" | 3 | 15 oz |
OSH4-05 | 5/8" | 4" | 14.25" | 10 | 15 oz |
OSH4-07 | 7/8" | 4" | 17.75" | 16 | 15 oz |
OSH4-11 | 1 1/8" | 4" | 21" | 21 | 15 oz |
OSH4-13 | 1 3/8" | 4" | 21" | 23 | 15 oz |
OSH6-11 | 1 1/8" | 6" | 15.38" | 25 | 40 oz |
OSH6-13 | 1 3/8" | 6" | 15.38" | 27 | 40 oz |
OSH6-15 | 1 5/8" | 6" | 18.63" | 35 | 40 oz |
All capacities shown based on 90% at 100°F condensing temperature.
See the DCFM Chart below for sizing info.
How To Choose
Select an oil separator based on the system’s tonnage (compressor BTUs) under normal operating conditions. Choose an oil separator with the nearest capacity to the system’s load at the evaporating temperature.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Centrifugal Oil Separators
Low Pressure | MAXIMUM WORKING PRESSURE: 450 PSIG
Features
Centrifugal oil separators are designed to remove large quantities of oil at a wide range of operating capacities. Field tests have shown these oil separators are up to 99% effective—even in high oil loading conditions.
Both sealed and serviceable units are available. We recommend serviceable oil separators for use in supermarket and parallel compressor systems.
For screw compressor applications, an oil separator/reservoir without internal float must be used. Contact Westermeyer Industries for more information.
PATENT # 7,810,351 B2
Catalog Number | ODS | Dimensions | Max. Capacity (Tons of Refrigeration) | Pre-Charge | Max. DCFM | |||||||||
R134A | R22 | R404A | ||||||||||||
A | B | C | D | -40°F | +40°F | -40°F | +40°F | -40°F | +40°F | |||||
Sealed | OS4-04C | 1/2" | 4” | 13" | 3" | 3.5" | 1 | 2 | 2 | 3 | 2 | 3 | 10 oz | 1.5 |
OS4-05C | 5/8" | 4" | 15" | 3" | 3.5" | 4 | 5 | 6 | 7 | 6 | 7 | 10 oz | 5 | |
OS4-07C | 7/8" | 4" | 17" | 3" | 4" | 6 | 7 | 9 | 10 | 8 | 9 | 10 oz | 7.5 | |
OS4-11C | 1 1/8" | 4" | 19" | 3" | 4" | 8 | 10 | 12 | 13 | 11 | 12 | 10 oz | 10 | |
OS6-13C | 1 3/8" | 6" | 15" | 4.5" | 5" | 10 | 13 | 16 | 18 | 15 | 19 | 30 oz | 13 | |
OS6-15C | 1 5/8" | 6" | 17" | 4.5" | 5" | 15 | 17 | 20 | 23 | 19 | 24 | 30 oz | 17 | |
OS6-21C | 2 1/8" | 6" | 17" | 5" | 5.25" | 23 | 27 | 32 | 38 | 30 | 39 | 30 oz | 27 | |
Serviceable | OS4-05FA | 5/8" | 4" | 15" | 3" | 3.5" | 4 | 5 | 6 | 7 | 6 | 7 | 25 oz | 5 |
OS4-07FA | 7/8" | 4" | 17" | 3" | 4" | 6 | 7 | 9 | 10 | 8 | 9 | 25 oz | 7.5 | |
OS4-11FA | 1 1/8" | 4" | 19" | 3" | 4" | 8 | 10 | 12 | 13 | 11 | 12 | 25 oz | 10 | |
OS6-13F | 1 3/8" | 6" | 22" | 4.5" | 5" | 10 | 13 | 16 | 18 | 15 | 19 | 25 oz | 12 | |
OS6-15F | 1 5/8" | 6" | 22" | 4.5" | 5" | 15 | 17 | 20 | 23 | 19 | 24 | 25 oz | 17 | |
OS6-21F | 2 1/8" | 6" | 22.38" | 5.25" | 5.88" | 23 | 27 | 32 | 38 | 30 | 39 | 25 oz | 27 | |
OS8-21 | 2 1/8" | 8" | 34" | 5.63" | 6" | 28 | 34 | 45 | 50 | 39 | 52 | 25 oz | 38 | |
OS8-25 | 2 5/8" | 8" | 23.50" | 6.16" | 6" | 44 | 54 | 68 | 77 | 63 | 82 | 25 oz | 55 | |
OS10-25 | 2 5/8" | 10" | 27" | 6.5" | 6.5" | 58 | 70 | 90 | 100 | 80 | 105 | 25 oz | 76 | |
OS12-31 | 3 1/8" | 12.8" | 30" | 7.75" | 9" | 90 | 110 | 140 | 160 | 125 | 165 | 25 oz | 118 |
Catalog Number | ODS | Dimensions | Max. Capacity (Tons of Refrigeration) | Pre-Charge | Max. DCFM | |||||||||
R134A | R22 | R404A | ||||||||||||
A | B | C | D | -40°F | +40°F | -40°F | +40°F | -40°F | +40°F | |||||
Sealed | OS4-04C | 1/2" | 4” | 13" | 3" | 3.5" | 1 | 2 | 2 | 3 | 2 | 3 | 10 oz | 1.5 |
OS4-05C | 5/8" | 4" | 15" | 3" | 3.5" | 4 | 5 | 6 | 7 | 6 | 7 | 10 oz | 5 | |
OS4-07C | 7/8" | 4" | 17" | 3" | 4" | 6 | 7 | 9 | 10 | 8 | 9 | 10 oz | 7.5 | |
OS4-11C | 1 1/8" | 4" | 19" | 3" | 4" | 8 | 10 | 12 | 13 | 11 | 12 | 10 oz | 10 | |
OS6-13C | 1 3/8" | 6" | 15" | 4.5" | 5" | 10 | 13 | 16 | 18 | 15 | 19 | 30 oz | 13 | |
OS6-15C | 1 5/8" | 6" | 17" | 4.5" | 5" | 15 | 17 | 20 | 23 | 19 | 24 | 30 oz | 17 | |
OS6-21C | 2 1/8" | 6" | 17" | 5" | 5.25" | 23 | 27 | 32 | 38 | 30 | 39 | 30 oz | 27 | |
Serviceable | OS4-05FA | 5/8" | 4" | 15" | 3" | 3.5" | 4 | 5 | 6 | 7 | 6 | 7 | 25 oz | 5 |
OS4-07FA | 7/8" | 4" | 17" | 3" | 4" | 6 | 7 | 9 | 10 | 8 | 9 | 25 oz | 7.5 | |
OS4-11FA | 1 1/8" | 4" | 19" | 3" | 4" | 8 | 10 | 12 | 13 | 11 | 12 | 25 oz | 10 | |
OS6-13F | 1 3/8" | 6" | 22" | 4.5" | 5" | 10 | 13 | 16 | 18 | 15 | 19 | 25 oz | 12 | |
OS6-15F | 1 5/8" | 6" | 22" | 4.5" | 5" | 15 | 17 | 20 | 23 | 19 | 24 | 25 oz | 17 | |
OS6-21F | 2 1/8" | 6" | 22.38" | 5.25" | 5.88" | 23 | 27 | 32 | 38 | 30 | 39 | 25 oz | 27 | |
OS8-21 | 2 1/8" | 8" | 34" | 5.63" | 6" | 28 | 34 | 45 | 50 | 39 | 52 | 25 oz | 38 | |
OS8-25 | 2 5/8" | 8" | 23.50" | 6.16" | 6" | 44 | 54 | 68 | 77 | 63 | 82 | 25 oz | 55 | |
OS10-25 | 2 5/8" | 10" | 27" | 6.5" | 6.5" | 58 | 70 | 90 | 100 | 80 | 105 | 25 oz | 76 | |
OS12-31 | 3 1/8" | 12.8" | 30" | 7.75" | 9" | 90 | 110 | 140 | 160 | 125 | 165 | 25 oz | 118 |
All capacities shown based on 90% at 100°F condensing temperature.
In varying-load applications, (ex. supermarkets) please refer to our online sizing tool for adjusted ratings.
*W4300-38F replacement float assembly and gasket available for serviceable oil separators.
How To Choose
Select an oil separator based on the system’s tonnage (compressor BTUs) under normal operating conditions. Choose an oil separator with the nearest capacity to the system’s load at the evaporating temperature. Minimum tonnage is 30% of the rated capacity.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Centrifugal Oil Separators
High Pressure | MAXIMUM WORKING PRESSURE: 675 PSIG
Features
High pressure centrifugal oil separators are designed to remove large quantities of oil at a wide range of operating capacities. Field tests have shown these oil separators are up to 99% effective—even in high oil loading conditions.
For screw compressor applications, a high pressure oil separator/reservoir without internal float must be used. Contact us for more information.
- Welded design for higher strength
- Nitrogen tested for cleanliness
- Powder paint finish
PATENT # 7,810,351 B2
Catalog Number | ODS | Dimensions | Capacity | Max DCFM | Pre-Charge | |||
(Tons) | ||||||||
A | B | C | D | R410A at +40ºF | ||||
OSH4-04C | 1/2" | 4” | 13" | 3" | 3.5" | 3 | 1.5 | 10 oz |
OSH4-05C | 5/8" | 4" | 15" | 3" | 3.5" | 10 | 5 | 10 oz |
OSH4-07C | 7/8" | 4" | 17" | 3" | 4" | 16 | 7.5 | 10 oz |
OSH4-11C | 1 1/8" | 4" | 19" | 3" | 4" | 21 | 10 | 10 oz |
OSH6-13C | 1 3/8" | 6" | 15" | 4.5" | 5" | 27 | 13 | 30 oz |
OSH6-15C | 1 5/8" | 6" | 17" | 4.5" | 5" | 35 | 17 | 30 oz |
Catalog Number | ODS | Dimensions | Capacity | Max DCFM | Pre-Charge | |||
(Tons) | ||||||||
A | B | C | D | R410A at +40ºF | ||||
OSH4-04C | 1/2" | 4” | 13" | 3" | 3.5" | 3 | 1.5 | 10 oz |
OSH4-05C | 5/8" | 4" | 15" | 3" | 3.5" | 10 | 5 | 10 oz |
OSH4-07C | 7/8" | 4" | 17" | 3" | 4" | 16 | 7.5 | 10 oz |
OSH4-11C | 1 1/8" | 4" | 19" | 3" | 4" | 21 | 10 | 10 oz |
OSH6-13C | 1 3/8" | 6" | 15" | 4.5" | 5" | 27 | 13 | 30 oz |
OSH6-15C | 1 5/8" | 6" | 17" | 4.5" | 5" | 35 | 17 | 30 oz |
All capacities shown based on 90% at 100°F condensing temperature.
In varying-load applications, (ex. supermarkets) please refer to our online sizing tool for adjusted ratings.
See the DCFM Chart below for sizing info.
How To Choose
Select an oil separator based on the system’s tonnage (compressor BTUs) under normal operating conditions. Choose an oil separator with the nearest capacity to the system’s load at the evaporating temperature.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Centrifugal Oil Separator / Reservoirs
Low Pressure | MAXIMUM WORKING PRESSURE: 450 PSIG
Features
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.
The separator and reservoir are divided by an internal baffle to protect reserved oil from the turbulent action of the separator. Two sight glasses provide visual indication of the oil level. A 3/8″ flare Rotolock valve is included for installation of the oil return port.
PATENT # 7,810,351 B2
Catalog Number | ODS | Dimensions | Max. Capacity (Tons of Refrigeration) | Max DCFM | Oil Capacity | ||||||||
R134A | R22 | R404A | |||||||||||
A | B | C | D | -40°F | +40°F | -40°F | +40°F | -40°F | +40°F | Gallons | |||
OS4-04RES | 1/2" | 4" | 32.63" | 2.63" | 3" | 1 | 1.25 | 1.5 | 1.75 | 1.5 | 2 | 1.5 | 2 |
OS4-05RES | 5/8" | 4" | 33" | 3.15" | 4" | 3.5" | 4 | 5.25 | 6 | 5 | 6 | 5 | 2 |
OS4-07RES | 7/8" | 4” | 33" | 3" | 4" | 6 | 7 | 9 | 10 | 8 | 9 | 7.5 | 2 |
OS4-11RES | 1 1/8" | 4" | 33" | 4" | 4" | 8 | 10 | 12 | 13 | 11 | 12 | 10 | 2 |
OS6-13RES | 1 3/8" | 6" | 32.63" | 4.38" | 5" | 10 | 13 | 16 | 18 | 15 | 19 | 13 | 1.5 |
OS6-15RES | 1 5/8" | 6" | 33.5" | 4.5" | 5" | 15 | 17 | 20 | 23 | 19 | 24 | 17 | 1.5 |
OS6-21RES | 2 1/8" | 6" | 33.5" | 5.25" | 5.9" | 23 | 27 | 32 | 38 | 30 | 39 | 27 | 1.5 |
OS8-21RES | 2 1/8" | 8" | 25.5" | 5.41" | 6" | 28 | 34 | 45 | 50 | 39 | 52 | 38 | 2 |
OS8-25RES | 2 5/8" | 8" | 25.5" | 6.16" | 6" | 44 | 54 | 68 | 77 | 63 | 82 | 55 | 2.5 |
OS10-25RES | 2 5/8" | 10" | 30" | 6.34" | 6.5" | 58 | 70 | 90 | 100 | 80 | 105 | 76 | 2.5 |
OS10-31RES | 3 1/8" | 10" | 30" | 7.5" | 6.5" | 90 | 110 | 140 | 160 | 125 | 90 | 90 | 2.5 |
OS12-31RES | 3 1/8" | 12" | 30" | 7.75" | 9" | 90 | 110 | 140 | 160 | 125 | 165 | 118 | 4 |
Catalog Number | ODS | Dimensions | Max. Capacity (Tons of Refrigeration) | Max DCFM | Oil Capacity | ||||||||
R134A | R22 | R404A | |||||||||||
A | B | C | D | -40°F | +40°F | -40°F | +40°F | -40°F | +40°F | Gallons | |||
OS4-04RES | 1/2" | 4" | 32.63" | 2.63" | 3" | 1 | 1.25 | 1.5 | 1.75 | 1.5 | 2 | 1.5 | 2 |
OS4-05RES | 5/8" | 4" | 33" | 3.15" | 4" | 3.5" | 4 | 5.25 | 6 | 5 | 6 | 5 | 2 |
OS4-07RES | 7/8" | 4” | 33" | 3" | 4" | 6 | 7 | 9 | 10 | 8 | 9 | 7.5 | 2 |
OS4-11RES | 1 1/8" | 4" | 33" | 4" | 4" | 8 | 10 | 12 | 13 | 11 | 12 | 10 | 2 |
OS6-13RES | 1 3/8" | 6" | 32.63" | 4.38" | 5" | 10 | 13 | 16 | 18 | 15 | 19 | 13 | 1.5 |
OS6-15RES | 1 5/8" | 6" | 33.5" | 4.5" | 5" | 15 | 17 | 20 | 23 | 19 | 24 | 17 | 1.5 |
OS6-21RES | 2 1/8" | 6" | 33.5" | 5.25" | 5.9" | 23 | 27 | 32 | 38 | 30 | 39 | 27 | 1.5 |
OS8-21RES | 2 1/8" | 8" | 25.5" | 5.41" | 6" | 28 | 34 | 45 | 50 | 39 | 52 | 38 | 2 |
OS8-25RES | 2 5/8" | 8" | 25.5" | 6.16" | 6" | 44 | 54 | 68 | 77 | 63 | 82 | 55 | 2.5 |
OS10-25RES | 2 5/8" | 10" | 30" | 6.34" | 6.5" | 58 | 70 | 90 | 100 | 80 | 105 | 76 | 2.5 |
OS10-31RES | 3 1/8" | 10" | 30" | 7.5" | 6.5" | 90 | 110 | 140 | 160 | 125 | 90 | 90 | 2.5 |
OS12-31RES | 3 1/8" | 12" | 30" | 7.75" | 9" | 90 | 110 | 140 | 160 | 125 | 165 | 118 | 4 |
All capacities shown based on 90% at 100°F condensing temperature.
In varying-load applications, (ex. supermarkets) please refer to our online sizing tool for adjusted ratings.
Note: These oil separators must be used with an oil pressure reducing valve.
The oil pressure will be the same as discharge pressure.
How To Choose
Select an oil separator based on the system’s tonnage (compressor BTUs) under normal operating conditions. Choose an oil separator with the nearest capacity to the system’s load at the evaporating temperature. Minimum tonnage is 30% of the rated capacity.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Centrifugal Oil Separator / Reservoirs
High Pressure | MAXIMUM WORKING PRESSURE: 675 PSIG
Features
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.
The separator and reservoir are divided by an internal baffle to protect reserved oil from the turbulent action of the separator. Two sight glasses provide visual indication of the oil level. A 3/8″ flare Rotolock valve is included for installation of the oil return port.
PATENT # 7,810,351 B2
Catalog Number | ODS | Dimensions | Capacity | Max DCFM | Oil Capacity | |||
Tons of Refrigeration | ||||||||
A | B | C | D | R410A at +40°F | Gallons | |||
OSH4-04RES | 1/2" | 4" | 32.5" | 3.15" | 3.5" | 3 | 1.5 | 2 |
OSH4-05RES | 5/8" | 4” | 33" | 3.15" | 4" | 10 | 5 | 2 |
OSH4-07RES | 7/8" | 4" | 33" | 3" | 4" | 16 | 7.5 | 2 |
OSH4-11RES | 1 1/8" | 4" | 33" | 3" | 4" | 21 | 10 | 2 |
OSH4-13RES | 1 3/8" | 4" | 33" | 3.38" | 4" | 23 | 11 | 2 |
OSH6-13RES | 1 3/8" | 6" | 33.5" | 4.38" | 5" | 27 | 13 | 1.5 |
OSH6-15RES | 1 5/8" | 6" | 33.5" | 4.5" | 5" | 35 | 17 | 1.5 |
OSH6-21RES | 2 1/8" | 6" | 33.5" | 5.25" | 5.9" | 56 | 27 | 1.5 |
OSH8-21RES | 2 1/8" | 8" | 25.5" | 5.41" | 6" | 79 | 38 | 2 |
OSH10-25RES | 2 5/8" | 10" | 30" | 6.34" | 6.5" | 158 | 76 | 2.5 |
OSH12-31RES | 3 1/8" | 12.75" | 30" | 7.75" | 9" | 245 | 118 | 4 |
Catalog Number | ODS | Dimensions | Capacity | Max DCFM | Oil Capacity | |||
Tons of Refrigeration | ||||||||
A | B | C | D | R410A at +40°F | Gallons | |||
OSH4-04RES | 1/2" | 4" | 32.5" | 3.15" | 3.5" | 3 | 1.5 | 2 |
OSH4-05RES | 5/8" | 4” | 33" | 3.15" | 4" | 10 | 5 | 2 |
OSH4-07RES | 7/8" | 4" | 33" | 3" | 4" | 16 | 7.5 | 2 |
OSH4-11RES | 1 1/8" | 4" | 33" | 3" | 4" | 21 | 10 | 2 |
OSH4-13RES | 1 3/8" | 4" | 33" | 3.38" | 4" | 23 | 11 | 2 |
OSH6-13RES | 1 3/8" | 6" | 33.5" | 4.38" | 5" | 27 | 13 | 1.5 |
OSH6-15RES | 1 5/8" | 6" | 33.5" | 4.5" | 5" | 35 | 17 | 1.5 |
OSH6-21RES | 2 1/8" | 6" | 33.5" | 5.25" | 5.9" | 56 | 27 | 1.5 |
OSH8-21RES | 2 1/8" | 8" | 25.5" | 5.41" | 6" | 79 | 38 | 2 |
OSH10-25RES | 2 5/8" | 10" | 30" | 6.34" | 6.5" | 158 | 76 | 2.5 |
OSH12-31RES | 3 1/8" | 12.75" | 30" | 7.75" | 9" | 245 | 118 | 4 |
All capacities shown based on 90% at 100°F condensing temperature.
In varying-load applications, (ex. supermarkets) please refer to our online sizing tool for adjusted ratings.
Note: These oil separators must be used with an oil pressure reducing valve.
The oil pressure will be the same as discharge pressure.
How To Choose
Select an oil separator based on the system’s tonnage (compressor BTUs) under normal operating conditions. Choose an oil separator with the nearest capacity to the system’s load at the evaporating temperature.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Coalescing Oil Separators
Sealed | MAXIMUM WORKING PRESSURE: 450 PSIG
Features
Our coalescing oil separators use a borosilicate glass filter element designed to be 99.5% effective at removing oil particles and system contaminants above 0.3 microns in size. It is recommended that the oil separator be changed when the pressure differential exceeds 15 psig.
See our parts & accessories page for the RDP-01 Differential Pressure Monitor.
Catalog Number | Fig. | Listing | ODS | Dimensions | Min DCFM | Max DCFM | Pre-Charge | |
A | B | |||||||
COS4-03(-1)* | 1 | UL | 3/8" | 8.25” | 4" | 0.6 | 6 | 15 oz |
COS4-04 | 1 | UL | 1/2" | 8.38" | 4" | 0.6 | 6 | 15 oz |
COS4-05 | 1 | UL | 5/8" | 10.56" | 4" | 1 | 10 | 15 oz |
COS4-07 | 1 | UL | 7/8" | 10.88" | 4" | 1 | 10 | 15 oz |
COS4-11 | 2 | UL | 1 1/8" | 15.37" | 4" | 2.5 | 25 | 10 oz |
COS4-13 | 2 | UL | 1 3/8" | 17.38" | 4" | 2.5 | 25 | 10 oz |
Catalog Number | Fig. | Listing | ODS | Dimensions | Min DCFM | Max DCFM | Pre-Charge | |
A | B | |||||||
COS4-03(-1)* | 1 | UL | 3/8" | 8.25” | 4" | 0.6 | 6 | 15 oz |
COS4-04 | 1 | UL | 1/2" | 8.38" | 4" | 0.6 | 6 | 15 oz |
COS4-05 | 1 | UL | 5/8" | 10.56" | 4" | 1 | 10 | 15 oz |
COS4-07 | 1 | UL | 7/8" | 10.88" | 4" | 1 | 10 | 15 oz |
COS4-11 | 2 | UL | 1 1/8" | 15.37" | 4" | 2.5 | 25 | 10 oz |
COS4-13 | 2 | UL | 1 3/8" | 17.38" | 4" | 2.5 | 25 | 10 oz |
*COS4-03 also available with angled ODS oil return.
(ex. COS4-03 for straight connection, COS4-03-1 for angled connection)
How To Choose
To correctly select the size of oil separator for your application, use the DCFM sizing chart, which is based on nominal evaporating and condensing temperatures.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Coalescing Oil Separators
Serviceable | MAXIMUM WORKING PRESSURE: 450 PSIG
Features
Our coalescing oil separators use a borosilicate glass filter element designed to be 99.5% effective at removing oil particles and system contaminants above 0.3 microns in size.
The filter is removable through the top flange assembly. Our flange/cover plate arrangement is easy to remove, eliminating the need for additional clearance during installation.
It is recommended that the filter be replaced when the pressure differential exceeds 15 psig.
See our parts & accessories page for the RDP-01 Differential Pressure Monitor.
Catalog Number | Fig. | Listing | ODS | Dimensions | Min DCFM | Max DCFM | Replacement Filter | Pre-Charge | |||
A | B | C | D | ||||||||
COS4-05F | 1 | UL | 5/8" | 16.25" | 4" | N/A | 6" | 1 | 10 | 90-050K | 10 oz |
COS4-07F | 1 | UL | 7/8" | 16.25" | 4" | N/A | 6" | 1 | 10 | 90-050K | 10 oz |
COS4-11F | 1 | UL | 1 1/8" | 20.63" | 4" | N/A | 10" | 1.5 | 25 | 90-051K | 10 oz |
COS4-13F | 1 | UL | 1 3/8" | 20.63" | 4" | N/A | 10" | 1.5 | 25 | 90-051K | 10 oz |
OS6-13FC* | 2 | UL | 1 3/8" | 29" | 6" | 5" | 15" | 1.4 | 30 | 90-016K | 25 oz |
OS6-15FC* | 2 | UL | 1 5/8" | 29" | 6" | 5" | 15" | 1.4 | 30 | 90-016K | 25 oz |
OS6-21FC* | 2 | UL | 2 1/8" | 29" | 6" | 5" | 15" | 1.4 | 30 | 90-016K | 25 oz |
W-1902C* | 2 | UL | 2 1/8" | 32" | 8" | 5" | 17" | 1.4 | 30 | 90-016K | 25 oz |
W-1903C-A* | 2 | UL | 2 5/8" | 38" | 10" | 5" | 21" | 4 | 50 | 90-020K | 25 oz |
OS12-31C* | 2 | ASME | 3 1/8" | 49" | 12.75" | 4" | 12" | 7 | 70 | 90-021K | 25 oz |
OS14-31C* | 2 | ASME | 3 1/8" | 56" | 14" | 4" | 14" | 10 | 100 | 90-019K | 25 oz |
OS12-41C* | 2 | ASME | 4 1/8" | 50" | 12.75" | 13" | 14" | 17 | 170 | 90-040K | 25 oz |
Catalog Number | Fig. | Listing | ODS | Dimensions | Min DCFM | Max DCFM | Replacement Filter | Pre-Charge | |||
A | B | C | D | ||||||||
COS4-05F | 1 | UL | 5/8" | 16.25" | 4" | N/A | 6" | 1 | 10 | 90-050K | 10 oz |
COS4-07F | 1 | UL | 7/8" | 16.25" | 4" | N/A | 6" | 1 | 10 | 90-050K | 10 oz |
COS4-11F | 1 | UL | 1 1/8" | 20.63" | 4" | N/A | 10" | 1.5 | 25 | 90-051K | 10 oz |
COS4-13F | 1 | UL | 1 3/8" | 20.63" | 4" | N/A | 10" | 1.5 | 25 | 90-051K | 10 oz |
OS6-13FC* | 2 | UL | 1 3/8" | 29" | 6" | 5" | 15" | 1.4 | 30 | 90-016K | 25 oz |
OS6-15FC* | 2 | UL | 1 5/8" | 29" | 6" | 5" | 15" | 1.4 | 30 | 90-016K | 25 oz |
OS6-21FC* | 2 | UL | 2 1/8" | 29" | 6" | 5" | 15" | 1.4 | 30 | 90-016K | 25 oz |
W-1902C* | 2 | UL | 2 1/8" | 32" | 8" | 5" | 17" | 1.4 | 30 | 90-016K | 25 oz |
W-1903C-A* | 2 | UL | 2 5/8" | 38" | 10" | 5" | 21" | 4 | 50 | 90-020K | 25 oz |
OS12-31C* | 2 | ASME | 3 1/8" | 49" | 12.75" | 4" | 12" | 7 | 70 | 90-021K | 25 oz |
OS14-31C* | 2 | ASME | 3 1/8" | 56" | 14" | 4" | 14" | 10 | 100 | 90-019K | 25 oz |
OS12-41C* | 2 | ASME | 4 1/8" | 50" | 12.75" | 13" | 14" | 17 | 170 | 90-040K | 25 oz |
*W4300-38F replacement float assembly and gasket available for serviceable oil separators.
See our replacement parts page for more information on replacement filters.
How To Choose
To correctly select the size of oil separator for your application, use the DCFM sizing chart, which is based on nominal evaporating and condensing temperatures.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Coalescing Oil Separator / Reservoirs
MAXIMUM WORKING PRESSURE: 450 PSIG
Features
Our coalescing oil separators use a borosilicate glass filter element designed to be 99.5% effective at removing oil particles and system contaminants above 0.3 microns in size.
The filter is removable through the top flange assembly. Our flange/cover plate arrangement is easy to remove, eliminating the need for additional clearance during installation.
It is recommended that the filter be replaced when the pressure differential exceeds 15 psig.
See our parts & accessories page for the RDP-01 Differential Pressure Monitor.
Catalog Number | Fig. | Listing | In / Out | Oil Return | Dimensions | Min DCFM | Max DCFM | Replacement Filter | Oil Capacity | ||
ODS | A | B | C | Gallons | |||||||
COS4-05FR | 1 | UL | 5/8" | 3/8" Flare | 19.5” | 4" | 6" | 1 | 10 | 90-050K | 0.6 |
COS4-07FR | 1 | UL | 7/8" | 3/8" Flare | 19.5" | 4" | 6" | 1 | 10 | 90-050K | 0.6 |
COS4-11FR | 1 | UL | 1 1/8" | 3/8" Flare | 28.63" | 4" | 10" | 2.5 | 25 | 90-051K | 0.85 |
COS4-13FR | 1 | UL | 1 3/8" | 3/8" Flare | 28.63" | 4" | 10" | 2.5 | 25 | 90-051K | 0.85 |
OS6-13FCR | 2 | UL | 1 3/8" | 3/4" Roto. | 34" | 6" | 15" | 1.4 | 30 | 90-016K | 2 |
OS6-15FCR | 2 | UL | 1 5/8" | 3/4" Roto. | 34" | 6" | 15" | 1.4 | 30 | 90-016K | 2 |
OS6-21FCR | 2 | UL | 2 1/8" | 3/4" Roto. | 34" | 6" | 15" | 1.4 | 30 | 90-016K | 2 |
W-1902CR | 2 | UL | 2 1/8" | 3/4" Roto. | 30" | 8" | 17" | 1.4 | 30 | 90-016K | 2 |
W-1903CR-A | 2 | UL | 2 5/8" | 3/4" Roto. | 41" | 10" | 21" | 4 | 50 | 90-020K | 3.5 |
OS12-31CR | 2 | ASME | 3 1/8" | 3/4" Roto. | 41" | 12.75" | 12" | 7 | 70 | 90-021K | 5 |
OS14-31CR | 2 | ASME | 3 1/8" | 3/4" Roto. | 46" | 14" | 14" | 10 | 100 | 90-019K | 5 |
OS12-41CR | 2 | ASME | 4 1/8" | 3/4" Roto. | 40.5" | 12.75" | 14" | 17 | 170 | 90-040K | 5 |
OS20-41CR | 3 | ASME | 4 1/8" | 2.13" ODS | 60" | 20" | 15" | 50 | 250 | 90-066K | 20 |
OS26-51CR | 3 | ASME | 5 1/8" | 2.63" ODS | 60" | 26" | 15" | 68 | 340 | 90-040M26K* | 35 |
OS30-61CR | 3 | ASME | 6 1/8" | 3.13" ODS | 63" | 30" | 15" | 100 | 500 | 90-066M30K* | 50 |
Catalog Number | Fig. | Listing | In / Out | Oil Return | Dimensions | Min DCFM | Max DCFM | Replacement Filter | Oil Capacity | ||
ODS | A | B | C | Gallons | |||||||
COS4-05FR | 1 | UL | 5/8" | 3/8" Flare | 19.5” | 4" | 6" | 1 | 10 | 90-050K | 0.6 |
COS4-07FR | 1 | UL | 7/8" | 3/8" Flare | 19.5" | 4" | 6" | 1 | 10 | 90-050K | 0.6 |
COS4-11FR | 1 | UL | 1 1/8" | 3/8" Flare | 28.63" | 4" | 10" | 2.5 | 25 | 90-051K | 0.85 |
COS4-13FR | 1 | UL | 1 3/8" | 3/8" Flare | 28.63" | 4" | 10" | 2.5 | 25 | 90-051K | 0.85 |
OS6-13FCR | 2 | UL | 1 3/8" | 3/4" Roto. | 34" | 6" | 15" | 1.4 | 30 | 90-016K | 2 |
OS6-15FCR | 2 | UL | 1 5/8" | 3/4" Roto. | 34" | 6" | 15" | 1.4 | 30 | 90-016K | 2 |
OS6-21FCR | 2 | UL | 2 1/8" | 3/4" Roto. | 34" | 6" | 15" | 1.4 | 30 | 90-016K | 2 |
W-1902CR | 2 | UL | 2 1/8" | 3/4" Roto. | 30" | 8" | 17" | 1.4 | 30 | 90-016K | 2 |
W-1903CR-A | 2 | UL | 2 5/8" | 3/4" Roto. | 41" | 10" | 21" | 4 | 50 | 90-020K | 3.5 |
OS12-31CR | 2 | ASME | 3 1/8" | 3/4" Roto. | 41" | 12.75" | 12" | 7 | 70 | 90-021K | 5 |
OS14-31CR | 2 | ASME | 3 1/8" | 3/4" Roto. | 46" | 14" | 14" | 10 | 100 | 90-019K | 5 |
OS12-41CR | 2 | ASME | 4 1/8" | 3/4" Roto. | 40.5" | 12.75" | 14" | 17 | 170 | 90-040K | 5 |
OS20-41CR | 3 | ASME | 4 1/8" | 2.13" ODS | 60" | 20" | 15" | 50 | 250 | 90-066K | 20 |
OS26-51CR | 3 | ASME | 5 1/8" | 2.63" ODS | 60" | 26" | 15" | 68 | 340 | 90-040M26K* | 35 |
OS30-61CR | 3 | ASME | 6 1/8" | 3.13" ODS | 63" | 30" | 15" | 100 | 500 | 90-066M30K* | 50 |
*Requires 2 filter kits per unit
See our replacement parts page for more information on replacement filters.
How To Choose
To correctly select the size of oil separator for your application, use the DCFM sizing chart, which is based on nominal evaporating and condensing temperatures.
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
DCFM SIZING CHART
OIL SEPARATOR
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.
Example:
R134A, 20 Tons at 20°F/110°F = 1.02 DCFM
Total DCFM = 20 tons x 1.02 DCFM = 20.40
For refrigerants and conditions not listed, see our online sizing calculator or contact us for assistance.
Refrigerant | Condensing Temp. | Evaporating Temp. | ||||||||
-40°F | -30°F | -20°F | -10°F | 0°F | 10°F | 20°F | 30°F | 40°F | ||
R134A | 80°F | 1.6 | 1.56 | 1.52 | 1.48 | 1.45 | 1.42 | 1.39 | 1.36 | 1.33 |
90°F | 1.44 | 1.4 | 1.37 | 1.33 | 1.3 | 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 | 1.2 | 1.17 | 1.13 | 1.1 | 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 | |
R22 | 80°F | 1.03 | 1.01 | 1 | 0.98 | 0.97 | 0.96 | 0.94 | 0.93 | 0.92 |
90°F | 0.93 | 0.91 | 0.9 | 0.89 | 0.87 | 0.86 | 0.85 | 0.84 | 0.83 | |
100°F | 0.84 | 0.83 | 0.81 | 0.8 | 0.79 | 0.78 | 0.77 | 0.76 | 0.75 | |
110°F | 0.77 | 0.75 | 0.74 | 0.73 | 0.72 | 0.71 | 0.7 | 0.69 | 0.68 | |
120°F | 0.71 | 0.69 | 0.68 | 0.67 | 0.65 | 0.64 | 0.63 | 0.62 | 0.61 | |
R404A | 80°F | 1.02 | 1 | 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 | 0.8 | 0.78 | 0.76 | |
100°F | 0.88 | 0.85 | 0.81 | 0.79 | 0.76 | 0.74 | 0.72 | 0.7 | 0.68 | |
110°F | 0.83 | 0.8 | 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 | |
R410A | 80°F | - | - | - | - | 0.62 | 0.62 | 0.61 | 0.6 | 0.6 |
90°F | - | - | - | - | 0.56 | 0.55 | 0.55 | 0.54 | 0.53 | |
100°F | - | - | - | - | 0.5 | 0.5 | 0.49 | 0.49 | 0.48 | |
110°F | - | - | - | - | 0.46 | 0.45 | 0.44 | 0.44 | 0.43 | |
120°F | - | - | - | - | 0.42 | 0.41 | 0.4 | 0.4 | 0.39 |
Refrigerant | Condensing Temp. | Evaporating Temp. | ||||||||
-40°F | -30°F | -20°F | -10°F | 0°F | 10°F | 20°F | 30°F | 40°F | ||
R134A | 80°F | 1.6 | 1.56 | 1.52 | 1.48 | 1.45 | 1.42 | 1.39 | 1.36 | 1.33 |
90°F | 1.44 | 1.4 | 1.37 | 1.33 | 1.3 | 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 | 1.2 | 1.17 | 1.13 | 1.1 | 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 | |
R22 | 80°F | 1.03 | 1.01 | 1 | 0.98 | 0.97 | 0.96 | 0.94 | 0.93 | 0.92 |
90°F | 0.93 | 0.91 | 0.9 | 0.89 | 0.87 | 0.86 | 0.85 | 0.84 | 0.83 | |
100°F | 0.84 | 0.83 | 0.81 | 0.8 | 0.79 | 0.78 | 0.77 | 0.76 | 0.75 | |
110°F | 0.77 | 0.75 | 0.74 | 0.73 | 0.72 | 0.71 | 0.7 | 0.69 | 0.68 | |
120°F | 0.71 | 0.69 | 0.68 | 0.67 | 0.65 | 0.64 | 0.63 | 0.62 | 0.61 | |
R404A | 80°F | 1.02 | 1 | 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 | 0.8 | 0.78 | 0.76 | |
100°F | 0.88 | 0.85 | 0.81 | 0.79 | 0.76 | 0.74 | 0.72 | 0.7 | 0.68 | |
110°F | 0.83 | 0.8 | 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 | |
R410A | 80°F | - | - | - | - | 0.62 | 0.62 | 0.61 | 0.6 | 0.6 |
90°F | - | - | - | - | 0.56 | 0.55 | 0.55 | 0.54 | 0.53 | |
100°F | - | - | - | - | 0.5 | 0.5 | 0.49 | 0.49 | 0.48 | |
110°F | - | - | - | - | 0.46 | 0.45 | 0.44 | 0.44 | 0.43 | |
120°F | - | - | - | - | 0.42 | 0.41 | 0.4 | 0.4 | 0.39 |