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Clean or replace. • Insufficient back pressure. Confirm 50-60 psig or higher backpressure when the compressor is running. • No specific cause found. Replace oil separator block assembly, scavenge line and secondary oil separator element. 21 2008SSD-34 (5/11) Single-Compressor Module Maintenance 4.4 Cleaning the Inlet Screen The 30-mesh screen in the inlet block must remain unobstructed for optimal flow rate. If the flow rate is lower than expected even when the Compressor is running properly, this screen may be obstructed. Figure 14 Gas Inlet Block and Screen To inspect and clean the inlet screen: 1. Turn off and isolate the Compressor from all power sources. 2. Turn off the gas supply. 3. Vent the system to 0 psig. 4. Remove the SAE plug on the side of the inlet block. 5. Remove the screen. 6. Inspect the screen and inside of the block. Clean or replace if necessary. 7. Replace SAE nut. 8. Return the Compressor Package to service. 9. Check for leaks at all fittings that have been disturbed. 4.5 Servicing the Scavenge Line Orifice The scavenge line orifice in the oil separator block must remain clear of obstruction. If this orifice is restricted, the secondstage oil separator can become saturated, increasing oil consumption. Note: image shown is 90 degree orifice. Procedure is the same for straight orifice. Figure 15 Scavenge Line Orifice Orifice To inspect and clean the orifice: 1. Turn off and isolate the Compressor from all power sources. 2. Turn off the gas supply. 3. Vent the system to 0 psig. 4. Disconnect the tube and remove the fitting. 5. Inspect the screen. Clean or replace the fitting assembly if necessary. 6. Replace the fitting and reconnect the tube. Tighten the swage nut hand tight plus 1/4 turn. 7. Return the Compressor Package to service. 8. Check for leaks at all fittings that have been disturbed. 22 2008SSD-34 (5/11) Single-Compressor Module Maintenance 4.6 Changing the Second-Stage Separator Element To replace the second-stage separator element: 1. Turn off and isolate the Compressor from all power sources. 2. Turn off the gas supply. 3. Vent the system to 0 psig. Follow applicable safety procedures and codes. 4. Loosen the separator element by turning it counterclockwise with a strap wrench. 5. Remove the separator element. Verify the gasket is removed with the separator. 6. Inspect the separator block for contaminants and remove any debris. 7. Apply a small amount of oil to the gasket and internal "O" ring on the new separator element. 8. Install the element on the separator block; turn clockwise to tighten. 9. Return the Compressor Package to service. 10. Check for leaks at all fittings that have been disturbed 5.0 T roubleshooting This section offers tips for troubleshooting. 5.1 Troubleshooting Guide Refer to Table 6 for recommended solutions to typical problems. Table 4 Troubleshooting Problem Recommended Actions Low Inlet Gas Pressure Fault • Closed gas inlet valve. • Restricted or insufficient gas supply. • Blocked inlet filter/screen (located internally on the Compressor Module inlet block). High Oil Temperature Fault • Blocked air flow across oil cooler. • Ensure cooling fans are operating when the unit is running and up to temperature; at approximately 180°F (82°C), fans should start to run at minimum speed. • Ensure adequate oil level in first-stage separator (see 4.3 - Oil Service on page 19). High Discharge Pressure Fault • Restricted discharge and bypass valve fault. VFD Fault • The drive LED will display the specific fault (see Table 7). Table 5 VFD fault codes and descriptions Code Description UU Insufficient voltage OU Excessive voltage OI.AC Excessive motor current (instantaneous condition) It.AC Excessive motor current (overload condition) Oh1, Oh2 Excessive heat sink temperature Ph Loss of AC supply phase 23 2008SSD-34 (5/11) Single-Compressor Module Maintenance 5.2 Platform Symptoms Diagnosis Use the following guidelines to troubleshoot operating problems. Table 6 Platform troubleshooting guidelines Problem Recommended Actions Low Gas Flow • Low inlet pressure • Insufficient gas supply • High temperature • Bypass valve open • Low Compressor speed • Restricted inlet screen High Oil Carryover • Saturated or dirty secondstage oil separator • High oil level • Restricted scavenge orifice • Insufficient back pressure • Oil dilution Compressors Won’t Run • Determine drive status. • Is inhibit circuit closed? • Is run signal present? • Does the VFD indicate a fault code? Incorrect Compressor Speed • Low inlet pressure • High discharge pressure • High temperature, fan, low oil, oil cooler • Problem with speed control sensor and related components High Temperature • Low oil level • Restricted oil filter • Blocked oil cooler air flow • Oil cooler fan not operating • Operation conditions outside of Compressor Module specifications 24 2008SSD-34 (5/11) Single-Compressor Module Maintenance 6.0 S pecifications Table 7 Compressor Module Specifications General Information Inlet pres...

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