Emerson COPELAND SCROLL SZO22 - Manual (Page 29)

23 2008SSD-34 (5/11) 22 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