Daikin AGZ065E - Compressor Thermal Protection Switch Open

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www.DaikinApplied.com 103 IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS
PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS
Compressor Will Not
Stage Up
1. Defective capacity control 1. Replace.
2. Faulty sensor or wiring 2. Replace.
3. Stages not set for application 3. Adjust controller setting for application.
Compressor Staging
Intervals Too Short
1. Control band not set properly 1. Adjust controller settings for application.
2. Faulty water temperature sensor 2. Replace.
3. Insufcient water ow 3. Correct ow.
4. Rapid temperature or ow swings 4. Stabilize load.
5. Oversized equipment 5. Evaluate equipment selection
6. Chiller enabled with no load 6. Evaluate BAS sequence and settings
7. Light loads 7. Evaluate need for HGBP or thermal inertia
Compressor Oil
Level Too High Or
Too Low
1. Oil hang-up in remote piping 1. Review refrigerant piping and correct.
2. Low oil level 2. Verify superheat, add oil.
3. Loose tting on oil line 3. Repair.
4. Level too high with compressor operating 4. Conrm correct superheat, remove oil.
5. Insufcient water ow - Level too high 5. Correct ow, verify superheat.
6. Excessive liquid in crankcase - Level too high 6. Check crankcase heater. Check liquid line solenoid valve operation.
7. Short cycling 7. Stabilize load or correct control settings for application.
8. HGBP valve oversize or improperly set-up 8. replace or adjust HGBP valve
9. Expansion valve operation or selection 9. Conrm superheat at minimum and maximum load conditions
10. Compressor mechanical issues 10. Replace compressor
11. Wrong oil for application 11. Verify
Motor Overload
Relays or Circuit
Breakers Open
1. Voltage imbalance or out of range 1. Correct power supply.
2. Defective or grounded wiring in motor 2. Replace compressor.
3. Loose power wiring or burnt contactors 3. Check all connections and tighten, replace contactors.
4. High condenser temperature 4. See corrective steps for High Discharge Pressure.
Compressor Thermal
Protection Switch
Open
1. Operating beyond design conditions 1. Correct so conditions are within allowable limits.
2. Discharge valve not open 2. Open valve.
3. Short cycling 3. Stabilize load or correct control settings for application
4. Voltage range or imbalance 4. Check and correct.
5. High superheat 5. Adjust to correct superheat.
6. Compressor mechanical failure 6. Replace compressor.