EarthLinked Technologies Prime-025 Quick Start Instructions
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PSD-QS (02/16) Page 492) SystemProblem /SymptomLikely Cause(s) CorrectionA. System does notrun.Note: Some digitalthermostats havea built-in five-minute timedelay.1. Thermostat fault. 1. Adjust thermostat settings. / Replacethermostat.2. Power supply problem (AHU /compressor unit).2. Check power supply for adequatephase and voltage. Check wiring tosystem and external breakers or fuses.3. Control voltage problem. 3. Check for 24V on terminal stripbetween “R” and “C”.4. Shut off by external thermostat orthermostat is defective. 4. Check operation of thermostat.5. System off on high pressure / lowpressure switches or dischargetemperature switch.5. Reset limit switch. Analyze system forroot cause.6. Internal component or connectionfailure.6. Check for loose wiring. Checkcomponents for failure.7. Compressor contactor not pulling in.7. Check for 24V across contactor. Trace24V circuit and components between“Y” and “C” to locate fault. Repair orreplace as necessary.8. Faulty run capacitor or startcomponents. 8. Test each and replace as necessary.9. Compressor windings shorted orgrounded.9. See compressor diagram/ replace thecompressor.B. System runs forlong period orcontinuously.1. Thermostat fault. 1. Adjust thermostat settings / Replacethermostat.2. Refrigerant undercharged. 2. Repair leak. Evacuate and rechargesystem.3. Component failure (cooling mode). 3. Check pressures and electrical circuitsfor abnormalities.4. Outdoor thermostat not connected orfailed (heating mode).4. Check outdoor thermostat and electricsupplemental heat operation. Confirmproper wiring.5. Reduced air flow.5. Check air ducts for leaks and repair.Check blower operation. Check airfilter(s). Remove air flow restrictions(min.400 CFM/ton).6. Four-way valve is short circuitingrefrigerant and bypassing hot gas tosuction.6. Replace four-way valve, evacuate,recharge and start-up system.7. Unit undersized. 7. Contact ETI Technical Support at 863-701-0096.C. System blowsfuses or tripscircuit breaker.1. Inadequate circuit ampacity. 1. Note electrical requirement and correctas necessary.2. Short, loose or improper connectionin field wiring. 2. Check field wiring for problems.3. Internal short circuit. Loose orimproper connection in system.3. Check wiring in system. Seeappropriate wiring schematics anddiagrams. Test components, especiallythe compressor, for shorts and grounds.Figure 36. System Troubleshooting Chart |
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