DNC200 - DNC1200 USER GUIDE
9 - Rev. D
7.
Troubleshooting / Service
Description
Cause
Remedy
Low
refrigerant
pressure
alarm
1) Refrigerant leak
2) Low pressure switch defective
3) Ambient below 41
º
F
1) Locate leak. Repair & recharge.
2) Replace
3) Increase ambient temperature
High
refrigerant
discharge
alarm
1) Condenser dirty/blocked
2) Fan pressure switch defective
3) Fan motor does not work/defective
4) Ambient temperature above 115
°
F (46
°
C)
5) High pressure switch defective
6) Expansion valve defective
7) Overcapacity/excessive thermal load
1) Clean condenser
2) Replace
3) Replace motor
4) Improve room ventilation
5) Replace
6) Replace
7) Reduce thermal load
Moisure downstream
of dryer
1) Dryer is off
2) Time drain not working and/or plugged
2a) Drain time settings need adjustment
3) Excessive thermal load
4) Compressor does not run/defective
5) Bypass around dryer is open
1) Check for proper voltage. Turn dryer on.
Check fuses and replace if necessary
2) Clean strainer
3) Reduce load
4) Check wiring, voltage.
Replace if necessary
5) Close bypass
High Dewpoint
1) Excessive thermal load
2) Compressor stopped
3) Dryer off
1) Reduce inlet and/or ambient
termperature and/or inlet flow
2) Check circuit for loose connection / open
3) Check electrical circuit
Other adjustments should only be made under the guidance of a certified refrigeration technician. The
controls interact with each other and, although the effect of an adjustment may not be immediately
obvious, it will affect the dryer’s performance.
7.1
Refrigerant Charging Procedure
• Charge liquid refrigerant only. Do not use vapor.
• The dryer needs to be pulled into a vacuum (500 micron minimum) for 30 minutes.
• Charge
liquid
refrigerant into the high side refrigeration access valve located in the line
on the outlet of the condenser.
• The full charge may not be accepted. If this occurs, the dryer can be started and the
remainder of the charge should be metered into the compressor suction service valve.
Summary of Contents for domnick hunter DNC1050
Page 1: ...domnick hunter Non Cycling Refrigerated Dryer User Guide Rev D Models DNC200 DNC1200...
Page 13: ...DNC200 DNC1200 USER GUIDE 13 Rev D 11 Associated Drawings REF ADE11374...
Page 14: ...DNC200 DNC1200 USER GUIDE 14 Rev D REF ADE11374...
Page 15: ...DNC200 DNC1200 USER GUIDE 15 Rev D REF ADE11374...
Page 16: ...DNC200 DNC1200 USER GUIDE 16 Rev D REF ADE11374...
Page 17: ...DNC200 DNC1200 USER GUIDE 17 Rev D REF ADE11374...