EarthLinked SCWD-024-1C, Quick Start Instructions

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SCWD-QS (12/16) Page 50
Figure 32. Compressor Unit Voltage Information
The following compressor checklist is provided to analyze the compressor and determine if it is
operating properly or if it is faulty:
1. Electrical Service Panel
– turn power off.
a. Check circuit terminal connections for tightness
b. Circuit breaker sized right?
c. Wire size correct? (check NEC or local codes)
2. Check capacitor or other start components for visible bulges, leaks, overheating or
loose wire connections.
3. Test capacitor and start components and replace if necessary. Capacitors can be
checked by substitution or with capacitance meter. OK if reads ±10% of the
manufacturer’s specification.
4. Check incoming power supply voltage to determine whether it is within acceptable
voltage range. (See Figure 32)
5. Check voltage at compressor unit terminals to determine whether it is within
acceptable voltage range. (See Figure 32)
6. Running Amperage. Connect a clip-on type ammeter to the (common) lead to the
compressor. Turn on the supply voltage and energize the unit. The compressor will
initially draw high amperage; it should soon drop to the RLA value (See Figure 7) or less.
If the amperage stays high, check the motor winding resistance and/or run capacitor.