Parker PNC1050, User Manual, Page: 9 / 38

9 - Rev. E
PNC200 - PNC1200 USER GUIDE
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
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.
7.2 Torque Values
Model
Suction Rotolock
Discharge
Rotolock
All Flare Nuts & Caps
Pressure
Switches
*Torque *Torque *Torque *Torque
PNC0200-A2 N/A N/A 9 ft/lbs 10 ft/lbs
PNC0250-A2
PNC0325-A2 56 ft/lbs 59 ft/lbs 9 ft/lbs 10 ft/lbs
PNC0250-A3 /A4/A5
PNC0325-A3 /A4/
A5 PNC0400-A3 /
A4/A5 59 ft/lbs 59 ft/lbs 9 ft/lbs 10 ft/lbs
PNC0500-A3 /A4/A5 59 ft/lbs 59 ft/lbs 9 ft/lbs 10 ft/lbs
PNC0700-A3 /A4/
A5 PNC0850-A3 /
A4/A5 66 ft/lbs 59 ft/lbs 9 ft/lbs 10 ft/lbs
PNC1050-A3 /A4/
A5 PNC1200-A3 /
A4/A5 81 ft/lbs 66 ft/lbs 9 ft/lbs 10 ft/lbs
Note: If using Crows Foot adapters, the torque valves must be re-calculated based on the specific adapter being used.