Quincy QPNC 250 - User Manual

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QPNC Series (75-250)

Non-Cycling

Parts/Instruction Manual

This manual contains important safety information and should be made available to

all personnel who operate and/or maintain this product. Carefully read this manual

before attempting to operate or perform maintenance on this equipment.

Manual No. 65504-2A

January 2007 Edition

Update: May 2009

Questions and Answers

E
Emily FlemingAug 5, 2025
What to do if my Quincy Dehumidifier motor cuts out on overload?
- B
  Brianna WolfeAug 5, 2025
  If the motor cuts out on overload, it could be due to several reasons. First, the dryer might be operating outside of its specified range; in this case, verify the treated air's flow rate. Secondly, the dryer might be working under unfavorable conditions for an air-cooled condenser; make sure to clean the condenser. Finally, the cooling circuit could be malfunctioning due to an incorrect refrigerant charge; check for any refrigerant gas leaks.
M
Megan TorresAug 9, 2025
Why is my Quincy QPNC 250 compressor head so hot?
- V
  veronicachavezAug 9, 2025
  If the compressor head is very hot, exceeding 131 °F (55 °C), it could be due to a few reasons. The dryer might be operating outside its rated capacity, so check the flow rate of the treated air. Additionally, the dryer may be working under poor conditions for the air-cooled condenser, so you should clean the condenser. It's also possible that the cooling circuit isn't working correctly due to an incorrect refrigerant charge, in which case you should check for leaks of refrigerating gas.
S
Steven AyalaAug 13, 2025
What to do if my Quincy QPNC 250 Dehumidifier compressor is very noisy?
- G
  Gene HarrisonAug 13, 2025
  If the compressor is very noisy, it indicates trouble with the internal mechanical parts or with the valves. You should consider repairing or replacing the affected components.
J
Joshua ContrerasAug 18, 2025
What to do if my Quincy QPNC 250 Dehumidifier motor hums and does not start?
- P
  Patricia OliverAug 18, 2025
  If the motor hums but doesn't start, it could be due to several reasons. First, the line voltage might be too low, in which case you should contact the electric power company. Second, the machine may have been switched off and on again too quickly, without allowing enough time for pressure balancing; wait a few minutes before restarting it. Lastly, the motor's starting system could be defective; check the running and starting relays and condensers, if installed.
S
Sonya RichardsAug 21, 2025
What to do if my Quincy Dehumidifier machine stopped and does not restart?
- N
  Nicholas SteeleAug 22, 2025
  If the machine (compressor) has stopped and won't restart, it could be due to overload protection or a burned-out compressor motor. In the first case, refer to sections B2, B3, and C3 for remedies. In the second case, replace the compressor.
R
rsmithAug 26, 2025
Why is there condensate in the pipings of my Quincy Dehumidifier?
- C
  colemanmichaelAug 26, 2025
  The presence of condensate in the pipings may be due to several factors. The condensate separator might not be working correctly; in this case, clean the condensate drain filter. The dryer could be operating outside its specified range; check the flow rate of treated air. Also, the dryer might be working under bad conditions for the air-cooled condenser; make sure to clean the condenser.
R
Renee AndersonAug 30, 2025
How to fix a Quincy QPNC 250 Dehumidifier with no compressed air passing through the outlet?
- T
  Tiffany HorneAug 30, 2025
  If no compressed air passes through the dryer outlet, the pipes may be frozen inside. This could be because the hot gas bypass valve is broken or out of calibration, or because the room temperature is too low, causing the evaporator's piping to be obstructed with ice.

Summary

Understanding General Information

Safety Messages and Warnings

Crucial warnings and cautions regarding the dryer's safe operation and intended use.

Safety Zones, Devices, and Decals

Identifies hazardous areas, safety features, and warning decals on the machine.

Essential Safety Instructions

Step-by-step safety guidelines for operating and maintaining the air dryer.

Installation Procedures

Electrical Connection Guide

Procedures for safely connecting the dryer to the power supply, adhering to codes.

Compressed Air System Connection

Steps for integrating the dryer into the existing compressed air system.

Dryer Dimensions and Technical Data

Operating the Air Dryer

Starting and Stopping Procedures

Control Panel Overview

Dryer Operation Explanation

Maintaining the Air Dryer

Cleaning Condensate Drain Filter

Condenser Cleaning Procedure

Service Checklist for Air Dryers

Troubleshooting Common Issues

QPNC-75 Dimensional Drawing

QPNC-100;-125 Dimensional Drawing

QPNC-150 to 250 Dimensional Drawing

QPNC-75 (115 V) Wiring Diagram

QPNC-75 (230 V) Wiring Diagram

QPNC-100;125 (115 V) Wiring Diagram

QPNC-100;125 (230 V) Wiring Diagram

QPNC-150;175;200;250 Wiring Diagram

Summary

Understanding General Information

Safety Messages and Warnings

Crucial warnings and cautions regarding the dryer's safe operation and intended use.

Safety Zones, Devices, and Decals

Identifies hazardous areas, safety features, and warning decals on the machine.

Essential Safety Instructions

Step-by-step safety guidelines for operating and maintaining the air dryer.

Installation Procedures

Electrical Connection Guide

Procedures for safely connecting the dryer to the power supply, adhering to codes.

Compressed Air System Connection

Steps for integrating the dryer into the existing compressed air system.

Dryer Dimensions and Technical Data

Operating the Air Dryer

Starting and Stopping Procedures

Control Panel Overview

Dryer Operation Explanation

Maintaining the Air Dryer

Cleaning Condensate Drain Filter

Condenser Cleaning Procedure

Service Checklist for Air Dryers

Troubleshooting Common Issues

QPNC-75 Dimensional Drawing

QPNC-100;-125 Dimensional Drawing

QPNC-150 to 250 Dimensional Drawing

QPNC-75 (115 V) Wiring Diagram

QPNC-75 (230 V) Wiring Diagram

QPNC-100;125 (115 V) Wiring Diagram

QPNC-100;125 (230 V) Wiring Diagram

QPNC-150;175;200;250 Wiring Diagram

Quincy QPNC 250 Specifications

General

Brand	Quincy
Model	QPNC 250
Category	Dehumidifier
Language	English

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