Troubleshooting / Service; Refrigerant Charging Procedure; Torque Values - Parker PNC200 User Manual

PNC200 - PNC1200 USER GUIDE
7.

Troubleshooting / Service

Description
Low
refrigerant
pressure
alarm
High
refrigerant
discharge
alarm
Moisure downstream
of dryer
High Dewpoint
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

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•
•
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7.2

Torque Values

Model
PNC0200-A2
PNC0250-A2
PNC0325-A2
PNC0250-A3 /A4/A5
PNC0325-A3 /A4/
A5 PNC0400-A3 /
A4/A5
PNC0500-A3 /A4/A5
PNC0700-A3 /A4/
A5 PNC0850-A3 /
A4/A5
PNC1050-A3 /A4/
A5 PNC1200-A3 /
A4/A5
Note: If using Crows Foot adapters, the torque valves must be re-calculated based on the specific adapter being used.
Cause
1) Refrigerant leak
2) Low pressure switch defective
º
3) Ambient below 41 F
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) 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) Excessive thermal load
2) Compressor stopped
3) Dryer off
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.
Discharge
Suction Rotolock
Rotolock
*Torque *Torque
N/A N/A
56 ft/lbs 59 ft/lbs
59 ft/lbs 59 ft/lbs
59 ft/lbs 59 ft/lbs
66 ft/lbs 59 ft/lbs
81 ft/lbs 66 ft/lbs
9 - Rev. E
1) Locate leak. Repair & recharge.
2) Replace
3) Increase ambient temperature
1) Clean condenser
2) Replace
3) Replace motor
4) Improve room ventilation
5) Replace
6) Replace
7) Reduce thermal load
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
1) Reduce inlet and/or ambient
termperature and/or inlet flow
2) Check circuit for loose connection / open
3) Check electrical circuit
Pressure
All Flare Nuts & Caps
Switches
*Torque *Torque
9 ft/lbs 10 ft/lbs
9 ft/lbs 10 ft/lbs
9 ft/lbs 10 ft/lbs
9 ft/lbs 10 ft/lbs
9 ft/lbs 10 ft/lbs
9 ft/lbs 10 ft/lbs
Remedy