IOMM AGZ-5
AGZ 026B through 130B
101
AGZ Troubleshooting Chart
PROBLEM
POSSIBLE CAUSES
POSSIBLE CORRECTIVE STEPS
1. Main
switch.
1. Close
switch.
2.
Fuse blown. circuit breakers open
2.
Check electrical circuits and motor windings for shorts or
grounds. Investigate for possible overloading. Replace
fuse or reset breakers after fault is corrected. Check for
loose or corroded connections.
3.
Thermal overloads tripped
3.
Overloads are auto-reset. Check unit closely when unit
comes back on line. Allow time for auto-reset.
4.
Defective contactor or coil.
4.
Repair or replace
5.
System shutdown by equipment protection devices
5.
Determine type and cause of shutdown and correct it
before resetting equipment protection switch.
6.
No cooling required
6.
None. Wait until unit calls for cooling.
7.
Liquid line solenoid will not open
7.
Repair or replace solenoid coil. Check wiring.
8.
Motor electrical trouble
8.
Check motor for opens, shorts, or burnout.
Compressor Will
Not Run
9.
Loose wiring
9.
Check all wire junctions. Tighten all terminal screws.
Compressor Noisy
Or Vibrating
1.
Low or no refrigerant charge
2.
Compressor running in reverse
3.
Improper piping support on suction or discharge
4.
Worn compressor isolator bushing
5. Worn
Compressor
1.
Repair and recharge
2.
Check unit and compressor for correct phasing
3.
Relocate, add, or remove hangers
4. Replace
5. Replace
1.
Noncondensables in system
1.
Extract the noncondensables with approved procedures.
2.
System overcharged with refrigerant
2.
Remove excess, check liquid subcooling.
3.
Optional discharge shutoff valve partially closed
3.
Open valve.
4.
FanTrol wiring not correct
4.
Check FanTrol wiring.
5.
Fan not running
5.
Check electrical circuit, Check fan motor.
High Discharge
Pressure
6.
Dirty condenser coil
7. Air
recirculation
6. Clean
coil.
7. Correct.
1.
Refrigerant flood back
1.
Correct.
2.
Wind blowing into coil at low ambient
2.
Shield coil from direct wind, Wind guards are available.
3.
Faulty condenser temperature regulation
3.
Check condenser control operation.
4.
Insufficient refrigerant in system
5.
Low suction pressure
4.
Check for leaks. Repair and add charge.
5.
See corrective steps for Low Suction Pressure.
Low Discharge
Pressure
6.
Only one compressor operating
6.
See corrective steps for Compressor Will Not Stage Up.
1.
Excessive water temperature
1.
Check control settings.
2.
Excessive load
2.
Reduce load or add additional equipment.
3.
Expansion valve overfeeding
3.
Check remote bulb. Regulate superheat.
High Suction
Pressure
4.
Compressors running in reverse
4.
Check for proper phasing.
1.
Rapid load swings
1.
Stabilize load.
2.
Lack of refrigerant
2.
Check for leaks, repair, add charge. Check liquid sight
glass.
3.
Clogged liquid line filter drier
3.
Check pressure drop across filter drier. Replace.
4.
Expansion valve malfunctioning
4.
Check and reset for proper superheat.
5.
Condensing temperature too low
5.
Check means for regulating condenser temperature.
6.
Compressor will not unload
6.
See corrective steps for Compressor Staging Intervals
Too Low.
7.
Insufficient water flow
7.
Adjust flow.
8.
Evaporator head ring gasket slippage
8.
Take pressure drop across vessel and contact factory to
obtain design pressure drop for that vessel.
Low Suction
Pressure
9. Evaporator
dirty
10.
Rapid load swings
9. Clean
chemically.
10. Stabilize
load.
1.
Defective capacity control
1.
Replace.
2.
Faulty thermostat stage or broken wire
2.
Replace.
Compressor Will
Not Stage Up
3.
Stages not set for application
3.
Reset thermostat setting for application.
1.
Thermostat control band not set properly
1.
Set control band wider.
2.
Faulty water temperature sensor
2.
Replace.
Compressor
Staging Intervals
Too Short
3.
Insufficient water flow
4.
Rapid load swings
3. Adjust
flow.
4. Stabilize
load.
Table continued on next page.
Summary of Contents for AGZ026BS
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Page 104: ...104 AGZ 026B through 130B IOMM AGZ 5...
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