Oil Separators
Features
Unicla series IV oil separators have new and improved design features to further enhance the quality and performance of these popular accessories, which have been part of the Unicla range for many years. The overall diameter of each model separator has been increased to allow Unicla to mould larger hose fittings into the unit whenever required. Also, enhanced dispersion material is now inserted into the separation chamber to assist with the oil separation process during operation.
Use
Oil separators are recommended in systems where the oil return to the compressor is potentially lower than it should be, at risk from a design feature in the system, or from adverse conditions created by system operation. These can include:
- Very long hose runs (> 6 metres), particularly in the suction line causing pressure drop and reduced refrigerant and oil flow.
- Low evaporator temperatures as found in transport refrigeration systems, causing oil to pool in the evaporator coil
- Large or multiple heat exchangers providing locations for oil to pool, as found in bus and coach rooftop applications
- Air-conditioning systems where the condensing temperature is greater than 50°C and the evaporating temperature is lower than -5°C
- High-revving and continuous compressor operation causing excessive oil discharge from the compressor in relation to oil return.
Oil separators are also recommended in systems where evaporator capacity is marginal and oil in the evaporator is affecting system efficiency. Reducing oil in the evaporator improves evaporator saturation temperatures by allowing optimum heat absorption in the refrigerant. Unicla oil separators will retain >70% of the original compressor oil level (COL) or approximately 40-60% of the recommended total system oil quantity (SOQ).
A-Type Oil Separator
Part No. 35401-000010
Male insert O-ring connections (#8: 3/4-16 UNF) for easy integration in the discharge line, and a male flare (7/16-20 UNF) for the oil return line. The A-Type oil separator is ideal for use with all Unicla 45 to 200 series compressors (45cc to 200 cc), and has a rated capacity as described in Table 1.
B-Type Oil Separator
Part No. 35401-000030
Male insert O-ring connections (#10: 7/8-14 UNF) for easy
integration in the discharge line, and a male flare (7/16-20 UNF)
for the oil return line. The B-Type oil separator is ideal for use with
all Unicla 300 series compressors (330 to 380 cc), and has a rated capacity as described in Table 1.
D-Type Oil Separator
Part No. 35401-000050
Male insert O-ring connections (#12: 1-1/16-14 UNF) for easy
integration in the discharge line, and a male flare (7/16-20 UNF) for the oil return line. The D-Type oil separator is ideal for use with all Unicla 330 series compressors (330 to 380 cc) where the suction and discharge line length exceeds four metres in length, and has a rated capacity as described in Table 1.
F-Type Oil Separator
Part No. 35401-000070
Male flare connections (#16: 1-5/16-12 UNF-2A) for easy integration with the discharge line, and a male flare (7/16-20 UNF) for the oil return line. The F-Type oil separator is ideal for use with all Unicla UWX series compressors (508 to 675 cc), and has a rated capacity as described in Table 1.
| Pressure | Oil return rate | ||||
|---|---|---|---|---|---|
| MPA | PSI | KPA | A Type | B Type | D/F Type |
| 3 | 435 | 3000 | 40 ml/min | 60 ml/min | 92 ml/min |
| 2 | 290 | 2000 | 30 ml/min | 40 ml/min | 64 ml/min |
| 1 | 143 | 1000 | 10 ml/min | 13 ml/min | 21 ml/min |
| 0.75 | 108 | 750 | 8 ml/min | 10 ml/min | 16 ml/min |
Unicla Universal Oil Separator Brackets
- A-Type: Part No. OSB00010
- B-Type: Part No. OSB00030
- D-Type: Part No. OSB00050
- F-Type: Part No. OSB00070
NOTE: All Unicla oil separators are supplied with a bracket
Fittings, Blanking plugs and Pressure switch fittings
All Unicla compressors (45 to UWX series) have consistent M12 x 1.00 mm access ports at the top, rear and bottom for easy interchange of blanking plugs, service valves, oil return and pressure switch fittings.
Oil Return Fitting
Part No. 42203-000161
Connection
Male flare (7/16- 20 UNF) into compressor port M12 x 1.00 mm
Application
Supplied as standard on all Unicla F model compressors, and 200 to UWX series compressors.
Oil Return Fitting
Part No. 42203-000240
Connection
Male ORFS (9/16-18 UNF) into compressor port M12 x 1.00 mm
Application
Special oil return fitting (O-ring face seal) commonly found in most leading direct drive transport refrigeration systems such as Carrier Transicold and Thermo King.
Pressure Switch Fitting
Part No. 42203-000150
Connection
Male flare with Schrader valve (7/16- 20 UNF) into compressor port M12 x 1.00 mm
Application
Direct installation of a variety of switches to both the low- and high-side access ports.
Oil Return Converter Fitting
Part No. 42203-000210
Connection
M8 x 1.00 mm into compressor port M12 x 1.00 mm
Application
Converts standard Unicla compressor access port from M12 x 1.0 to M8 x 1.00 mm, which allows use of alternative oil return fittings commonly found on transport refrigeration systems.
Blanking Plug
Part No. 13201-000010
Connection
M12 x 1.00 mm.
Application
To blank off any access port.
Connection options for Unicla oil separator
Recommended Oil
Each Unicla compressor is fitted with specific oil. The above chart outlines the recommended selection of oil and refrigerant for common applications. However, each compressor is labelled separately with the refrigerant and oil type to be used.
Use ONLY the recommended refrigerant and oil.
| Unicla Oil | Type | Viscosity @ 40ºC | Viscosity @ 100ºC |
|---|---|---|---|
| Unidap 3 | POE32 | 32.50 | 5.80 |
| Unidap 6 | POE68 | 65.50 | 9.30 |
| Unidap 7 | PAG56 | 56.00 | 10.85 |
| Unidap 8 | PAG46 | 48.01 | 10.51 |
| Unidap 9 | PAG46 HD | 46.00 | 9.70 |
| Unidap 10 | PAG100 | 100.00 | 21.00 |
The following diagram shows a Unicla oil separator installed into the circuit with the oil return line connected to the top of the compressor oil return port, and the added benefit where compressor oil level (COL) is increased and oil in circulation (OIC) is reduced.
