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**COMPRESSOR PROTECTIVE DEVICES**

**OIL SEPARATOR SIZING GUIDELINES**

**Selection Method**

**To determine DCFM for Oil Separator sizing the following parameters are**

**needed:**

**Ÿ**

**Evaporating Temperature**

**Ÿ**

**Condensing Temperature**

**Ÿ**

**Cooling Capacity (in Tons)**

**Ÿ**

**Refrigerant Type**

**Use the following method to determine the DCFM needed for Oil Separator**

**Selection**

**1. Find the corresponding DCFM/Ton factor by locating the appropriate**

**evaporating and condensing temperatures and refrigerant type on**

**the DCFM/Ton Factor table.**

**2. Multiply the DCFM/Ton factor by the Cooling Capacity to determine**

**the resulting DCFM for Separator sizing.**

**3. Use the associated Oil Separator DCFM Capacity table in each Oil**

**Separator section to determine Oil Separator models where the**

**calculated system DCFM falls between the minimum and maximum**

**DCFM rating.**

**4. From the selected models, choose appropriate Oil Separator by**

**taking into account connection size and serviceable/non-serviceable**

**choices.**

**If the refrigerant type required is not listed or if there are any questions about**

**proper separator sizing please contact Technical Support at 1-800-627-5148.**

**Determining Oil Separator Gas DCFM**

**Correct Oil Separator sizing is essential for proper oil separation and minimal**

**pressure drop across the separator. The following example will demonstrate**

**how to select an Oil Separator based on a discharge cubic feet per minute**

**(DCFM) value that has been calculated using four primary system**

**parameters.**

**It is important to determine the DCFM value of the hot gas flow approaching**

**the Oil Separator. The DCFM values entering the Oil Separator are shown as**

**a minimum and maximum allowed. The minimum DCFM rating is based on**

**the minimum allowed gas velocity for oil separation to occur, while the**

**maximum DCFM rating is when a 0.75-1.0 psi pressure drop will develop**

**across the Oil Separator.**

**Selection Example**

**The following system parameters will be used for the sizing example:**

**Ÿ**

**Evaporating Temperature = -40°F**

**Ÿ**

**Condensing Temperature = 105°F**

**Ÿ**

**Cooling Capacity (in Tons) = 20 Tons**

**Ÿ**

**Refrigerant Type = R-404A**

**Ÿ**

**Line Size = 1-5/8”**

**Ÿ**

**Oil Separator type desired = Serviceable Helical Oil Separator**

**1. The DCFM/Ton table shows a DCFM/Ton factor of 0.790 for the**

**chosen system parameters**

**2. System DCFM = DCFM/Ton factor x Cooling capacity**

**0.790 x 20 = 15.8 DCFM**

**3. The Helical Oil Separator DCFM Capacity table lists the following**

**separators that meet the DCFM requirements:**

**S-5190, S-5192, S-5194, S-5290, S-5292, and S-5294**

**4. Based on the line size and desired type, the S-5292 would be the**

**best choice*.**

***Selecting a Helical Oil Separator with a connection size smaller than the line**

**size will help keep the velocity high needed for separation, if the system**

**experiences frequent unloading, but may lead to a slightly higher pressure**

**drop across the Oil Separator at full capacity. Selecting a Helical Oil**

**Separator with a connection size larger than the line size is not**

**recommended due to the loss of velocity as the discharge gas enters the Oil**

**Separator. Please contact Technical Support at 1-800-627-5148 for**

**assistance or recommendations when selecting Oil Separators.**

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