20
Nirvana Cycling Refrigerated Dryer Models 3250-8000
ingersollrandproducts.com
11.0 TROUBLESHOOTING
11.1 INTRODUCTION
Ingersoll Rand multiple module dryers are designed for reliable, trouble-free operation. In the event of any dryer malfunction, the guide below has
been developed to facilitate problem identification and corrective actions.
A
WARNING
An air dryer always operates under pressure. Any maintenance
procedure that involves disassembly of pipe fittings, valves or any
other components requires the dryer be isolated from the compressed
air stream and fully depressurized.
A
WARNING
Prior to working on the unit, make sure that all circuit breakers or
disconnected switches are tagged “Out of Service.”
A
NOTICE
Any in-depth troubleshooting should only be done by qualified service
technicians. Prior to performing any significant corrective action,
consult factory.
11.2 PROBLEM / ACTION GUIDE
PROBLEM
Compressor will not start (no hum)
Compressor will not start hums but trips on
overload protector
Compressor starts and runs, but short cycles
on overload protector
Compressor starts and runs, but short cycles
on high or low pressure cut out.
Liquid line frosted or sweating
Unit operates long or continuously
Suction line frosted or sweating
Unit noisy
Moisture down stream. Dryer is properly
cooling air stream (Check Chllr Temp on
controller)
POSSIBLE CAUSE
1. Line disconnect switch open
2. Fuse removed or blown
3. Overload protector tripped
4. Control stuck in open position
5. Wiring improper or loose
1. Improperly wired
2. Low voltage to unit
3. Compressor motor has a winding open or
shorted
4. Internal trouble in compressor
1. Excessive discharge pressure
2. Compressor hot - return gas hot
3. Compressor has shorted winding
1. High pressure cut-out due to:
a. Insufficient air flow across condenser
b. Overcharge
c. Insufficient water flow across condenser
2. Low pressure cut-out due to:
a. Undercharge
b. Restriction in or faulty expansion valve
1. Restriction in filter dryer or condenser
1. Shortage of refrigerant
2. Control contacts stuck
3. System inadequate to handle load.
4. Restriction in refrigerant system
5. Dirty condenser
1. Expansion valve passing excess refrigerant
2. Overcharge of refrigerant
3. Expansion valve stuck open
1. Loose parts or mountings
2. Tubing rattle
3. Bent fan blade
4. Fan motor bearings worn
Drain failure or adjustment is required
CORRECTIVE ACTION
1. Close start or disconnect
2. Inspect and replace fuse
3. Allow internal overload to cool and reset.
Check motor windings and starting amps.
4. Repair or replace control
5. Close start or disconnect
1. Check wiring
2. Determine reason and correct
3. Replace compressor
4. Replace compressor
1. Check condenser for dirt
2. Check refrigerant charge (fix charge)
3. Replace compressor
1.High pressure cut-out
a. Check condenser for dirt and proper fan
operation.
b. Reduce refrigerant charge
c. Check complete water circuit make
necessary adjustment
2.Low pressure cut-out
a. Fix leak, add refrigerant
b. Consult factory prior to replacing valve.
1. Replace part
1. Fix leak then charge
2. Clean contacts or replace control
3. Review air system parameters.
4. Determine location and correct.
5. Clean condenser
1. Check super heat and adjust valve if
required. Adjustment is rarely required.
Consult factory.
2. Correct charge as per manual
3. Clean valve of foreign particles, replace if
necessary.
1. Find parts and tighten
2. Reform, to be free of contact
3. Replace blade
4. Replace motor
Manually activate drain and determine
functionality. If drain does not discharge
properly, service drain.
