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8

FIELD SERVICE GUIDE

Problems most frequently encountered with refrigerated 

dryers are water downstream of the dryer and excessive 

pressure drop. Most causes can be identified and remedied 

by following this guide.

  Closed refrigeration systems are potentially 

dangerous. Work on the refrigeration system must be done 

only by a competent licensed refrigeration mechanic. Do not 

release fluorocarbon refrigerants to the atmosphere. Do not 

discharge liquid refrigerants into floor drains.  Refrigerant 

vapors may accumulate in low places.  Inhalation of high 

concentrations may be fatal.  All refrigerants must be 

recovered per EPA requirements. 

Do not smoke when a refrigeration leak is suspected. Burning 

materials may decompose refrigerants, forming a toxic gas or 

acids that may cause serious injury and property damage.
Before dismantling any part of the dryer or compressed 

air system, completely vent the internal pressure to the 

atmosphere.

PROBLEM

SYMPTOM

POSSIBLE CAUSE

REMEDY

Water Downstream of 

Dryer

Refrigerant compressor not 

running.

Loss of power to dryer

Check power supply, fuses and/or breakers.  Check 

for loose connections.

Dryer turned off.

Check On/Off switch position. 

Dryer overloaded.

Confirm that inlet flow, inlet temperature and inlet 

pressure are within acceptable range of dryer.

Condenser clogged with debris.

Check/clean ambient air filter and condenser.

Fan motor inoperative

Check fan motor operation.  Replace if necessary.

Ambient temperature too high.

Verify ambient temperature throughout day.

High pressure switch activated 

(models 200 to 500 only)

Press manual reset button to switch to reset button.

Compressor overheated.

Turn dryer off.  Contact local distributor.

Compressor defective.

Turn dryer off.  Contact local distributor.

No condensate discharging from 

dryer.

Drain strainer clogged.

Clean drain strainer.

Drain valve inoperative.

Check/rebuild drain valve.

Drain timer or DSM inoperative.

Confirm there is power to the timer or DSM.  

Replace timer or DSM, if necessary.

Drain solenoid inoperative.

Confirm there is power to the coil.  Replace coil, if 

necessary.

Condensate discharging from dryer.

Incorrect drain timer setting.

Adjust drain timer - increase open time and/or 

decrease closed time.

Liquid water entering dryer.

Aftercooler drain valve malfunction.

Check, repair aftercooler drain valve.

Excessive Pressure 

Drop Across Dryer

Frozen condensate in evaporator.

Incorrect hot gas bypass valve 

setting.

Contact local distributor.

Inlet air pressure low.

Upstream restriction in air system.

Check all upstream air system components (valves, 

regulators, etc.)

Dryer undersized.

Excessive compressed air flow.

Resize dryer.

Dew Point Indicator 

Out of Green Zone

Dryer overloaded.

Confirm that inlet flow, inlet temperature and inlet 

pressure are within acceptable range of dryer.

Condenser clogged with debris.

Check/clean ambient air filter and condenser.

Loose sensor connection.

Confirm gauge or DSM sensor is tightly connected 

to dryer tubing.

Defective gauge, DSM or DSM 

sensor.

Replace gauge, DSM or DSM sensor.

Summary of Contents for RNP Series

Page 1: ...F 39 F C OFF ON 33 1 C 4 3227498 Rev A AUGUST 2012 RNP SERIES REFRIGERATED COMPRESSED AIR DRYERS OPERATOR MANUAL RNP75 RNP100 RNP125 RNP150 RNP200 RNP250 RNP300 RNP400 RNP500 ...

Page 2: ...ations for the requirements for breathing quality air RECEIVING MOVING AND UNPACKING A RECEIVING This shipment has been thoroughly checked packed and inspected before leaving our plant It was received in good condition by the carrier and was so acknowledged Check for Visible Loss or Damage If this shipment shows evidence of loss or damage at time of delivery to you insist that a notation of this l...

Page 3: ...nnot tolerate undried air for short periods install a second dryer in the bypass line Compressed air systems commonly require filters to remove compressor oils particulates condensed liquids and other contaminants When an oil removal filter is used it should be installed downstream of the refrigerated dryer At this location the life of the replaceable filter element is prolonged since some of the ...

Page 4: ...that automatically discharges condensate from the dryer Drain valve operation is controlled by a drain valve timer The drain opening can be set from 0 5 seconds to 9 seconds The drain cycle can be set from 0 5 minutes to 9 minutes Models 75 through 150 have the timer mounted directly on the drain valve For models 200 through 500 drain valve adjustments are made on the Dryer System Monitor DSM Elec...

Page 5: ...n indicates low orange indicates medium red indicates high 5 Part of the graphic for the dew point temperature scale The thermometer indicates the high hot end of the scale 6 Six 6 LEDs that indicate dew point temperature according to the graphic scale above the LEDs The color of each LED matches the colored bars 7 Adjustment knob for the drain valve open time The values on the dial correspond to ...

Page 6: ...tem The dryer is designed to run continuously Let the dryer run even when the demand for compressed air is interrupted the dryer will not freeze up SHUTDOWN When the dryer must be shutdown for maintenance or other reasons use the following procedure If electrical repairs must be made 1 Turn off the power switch 2 Disconnect the main power supply 3 Lock out and tag the power supply in accordance wi...

Page 7: ...onnect the drain valve to the drain valve strainer 6 Remove screw and washer from front of the drain valve 7 Remove the power supply connector and gasket with the timer assembly if attached from the solenoid coil housing Do not damage or lose the gasket 8 Remove coil fixing nut and spring washer from top of solenoid coil housing 9 Lift solenoid coil housing off solenoid core in valve body 10 Unscr...

Page 8: ...tor operation Replace if necessary Ambient temperature too high Verify ambient temperature throughout day High pressure switch activated models 200 to 500 only Press manual reset button to switch to reset button Compressor overheated Turn dryer off Contact local distributor Compressor defective Turn dryer off Contact local distributor No condensate discharging from dryer Drain strainer clogged Cle...

Page 9: ... inlet temperature 100 psig inlet pressure 100 inlet relative humidity 100 F ambient temperature 60Hz Per CAGI ADF 100 b Refer to dryer data plate for refrigerant charge c Compressor capacity 35 F evaporating temperature 130 F condensing temperature MINIMUM MAXIMUM OPERATING CONDITIONS ALL MODELS Min Max Inlet Air Pressure compressed air at inlet to dryer 10 232 psig Min Max Inlet Air Temperature ...

Page 10: ...RUNNING LAMP R 2 5 CS CR 1 3 6 PTC STARTER F P S FAN MOTOR T ELECTRONIC AUTO DRAIN VALVE OVERLOAD PROTECTOR COMP 1PH S M C Figure 1a 75 scfm models 115V 1PH 60Hz 5 6 ON OFF SWITCH WITH RUNNING LAMP R 2 F P S M S C COMP 1PH OVERLOAD PROTECTOR PTC STARTER FAN MOTOR ELECTRONIC AUTO DRAIN VALVE T ...

Page 11: ...COMP 1 C P R b Potential Relay FAN MOTOR Overload protector OLP P R T F P S H P S FUSE FOR ELECTRO AUTO DRAIN VALVE SENSOR ELECTRO AUTO DRAIN VALVE FUSE U1 RL1 DSM SOL 21 21 24 3 F1 2A ON OFF SWITCH WITH RUNNING LAMP S R T 0V R 440V T 380V TR 150VA 115V 0V MC1 11 460V 3Ø 60Hz F P S 31 21 24 24 1 2 3 4 5 6 7 o o o o o o o R MC1 REF COMP With internal T P M FAN MOTOR With internal T P ...

Page 12: ...RYER REFRIGERANT COMPRESSOR CONDENSER FAN BLADES FAN MOTOR AIR FLOW CHILLER REF TO AIR HEAT EXCHANGER REHEATER AIR TO AIR HEAT EXCHANGER COMPRESSED AIR INLET COMPRESSED AIR OUTLET S MOISTURE SEPARATOR INTEGRATED BRAZED PLATE HEAT EXCHANGER ELECTRONIC AUTO DRAIN VALVE WITH TIMER CAPILLARY TUBE HOT GAS BY PASS VALVE F P S ...

Page 13: ... CONDENSER FAN BLADES FAN MOTOR AIR FLOW CHILLER REF TO AIR HEAT EXCHANGER REHEATER AIR TO AIR HEAT EXCHANGER COMPRESSED AIR INLET COMPRESSED AIR OUTLET S MOISTURE SEPARATOR INTEGRATED BRAZED PLATE HEAT EXCHANGER ELECTRONIC AUTO DRAIN VALVE HIGH PRESSURE SWITCH HOT GAS BY PASS VALVE CAPILLARY TUBE FAN PRESSURE SWITCH H P S F P S ...

Page 14: ...RNPJMK3 RNPJMK3 RNPJMK3 Item Description 200 scfm 250 scfm 300 scfm 400 scfm 500 scfm 1 Refrigerant Compressor 3161251 3093041 3137014 3090708 3161242 2 Condenser air cooled 3161255 3161255 3161256 3161256 3161245 3 Fan Blades 3041955 3041955 3041957 3041957 3041957 4 Fan Motor 5000011 5000011 5000011 5000011 5000011 5 Filter Dryer 1283273 1283273 1283369 1283369 1283369 6 Solenoid Valve Assembly ...

Page 15: ...15 ...

Page 16: ...facturer is the original purchase price of the product or part THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES WHETHER WRITTEN ORAL OR STATUTORY AND IS EXPRESSLY IN LIEU OF THE IMPLIED WARRANTY OF MERCHANTABILITY AND THE IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE THE MANUFACTURER SHALL NOT BE LIABLE FOR LOSS OR DAMAGE BY REASON OF STRICT LIABILITY IN TORT OR ITS N...

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