Emerson Copeland Scroll SZV44 Troubleshooting Guide download pdf (Page 31)

25 2006SSD-75 R4 (10/10) 24 2006SSD-75 R4 (10/10)

Dual-Compressor Module Troubleshooting

24 2006SSD-75 R4 (10/10)

5.0 troubleshootiNg

This section offers tips for troubleshooting.

5.1 Troubleshooting Guide

Refer to Table 4 for recommended solutions to typical problems.

Table 4 Troubleshooting

Problem Recommended Actions

Low Inlet

Gas Pressure

Fault

• Closed gas inlet valve.

• Restricted or insufcient gas supply.

• Blocked inlet lter/screen (located internally on the Compressor Module inlet block).

High Oil

Temperature

Fault

• Blocked air ow 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 rst-stage separator (see 4.3 - Checking the Oil Level on

page 19).

High Discharge

Pressure Fault

• Restricted discharge and bypass valve fault.

VFD Fault • The drive LED will display the specic fault

5.2 Motor Winding Resistance

Table 5 Motor winding resistance

Compressor

Model Motor Winding Resistance

C1A and C3A

Phase-to-phase

= 1.2 to 1.4 ohms

C2A

Phase-to-phase

= 0.7 ohms

All Compressor

Modules

Phase-to-ground

= Innity

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Emerson Copeland Scroll SZV44 Troubleshooting Guide Page 31