Quincy QPNC Series - User Manual

Questions and Answers

M
Mark SkinnerJul 27, 2025
What to do if my Quincy QPNC Dehumidifier motor cuts out on overload?
- T
  Tammy DurhamJul 27, 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.
R
Rebecca SuttonJul 31, 2025
Why is my Quincy Dehumidifier compressor head so hot?
- B
  benitezchristopherJul 31, 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.
E
elizabeth55Aug 4, 2025
What to do if my Quincy QPNC compressor is very noisy?
- H
  Haley NealAug 4, 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
Johnathan RodriguezAug 9, 2025
What to do if my Quincy Dehumidifier motor hums and does not start?
- S
  stephanie93Aug 9, 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.
G
gmillerAug 13, 2025
What to do if my Quincy Dehumidifier machine stopped and does not restart?
- Y
  ywatsonAug 13, 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.
H
Heather PetersonAug 17, 2025
Why is there condensate in the pipings of my Quincy QPNC Dehumidifier?
- C
  Crystal KruegerAug 17, 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.
W
walkerbeverlyAug 21, 2025
How to fix a Quincy QPNC Dehumidifier with no compressed air passing through the outlet?
- C
  Christy JohnsonAug 21, 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

General Information

Inspection

Check equipment for any concealed shipping damage before use.

Disclaimer of Warranty

Manufacturer disclaims liability for loss or injury if unit is used for breathing air without proper precautions.

Safety Messages & Precautions

General warnings and cautions regarding dryer use, fire/explosion risks, and proper application.

Safety Zones, Devices, and Decals

Identified Safety Risks

Lists specific risks present on the machine, such as electric voltage, high pressure, and rotating fan.

Safety Instructions

General Safety Rules

Essential safety rules for operating air compressors and accessories, including reading instructions and proper wiring.

Safe Handling and Usage

Guidelines on using suitable parts, releasing pressure slowly, and securing drain lines to prevent injury.

Installation Instructions

Dryer Location and Positioning

Guidelines for selecting a suitable installation environment and positioning the dryer.

Electrical Connection Requirements

Instructions for proper electrical hookup, including voltage checks, grounding, and circuit protection.

Compressed Air System Connection

How to connect the dryer to the compressed air system, including shut-off valves and drainage.

Technical Specifications and Dimensions

Details on dryer dimensions, weights, inlet/outlet connections, and operating conditions.

Start-Up and Operation

Preliminary Controls and Checks

Essential checks before starting the dryer, including air piping, drainage, and power supply.

Starting and Stopping Procedure

Step-by-step guide for safely starting and stopping the dryer, including pressure discharge.

Controls Overview

Identification and function of the command and control panel components.

Dryer Operation and Function

Explanation of the dryer's operational cycle, refrigerant circuit, and automatic bypass system.

Maintenance

Maintenance Schedule

Recommended weekly and monthly maintenance tasks for optimal dryer performance.

Cleaning Procedures

Step-by-step instructions for cleaning the condensate drain filter and condenser.

Troubleshooting

Problem Diagnosis and Solutions

A guide to common symptoms, their causes, and remedies, including required professional intervention.

Parts Lists

QPNC-75 External Parts List

List of external components for the QPNC-75 model with part numbers.

QPNC-75 Internal Parts List

List of internal components for the QPNC-75 model with part numbers.

QPNC-100;125 External Parts List

List of external components for QPNC-100/125 models with part numbers.

QPNC-100;125 Internal Parts List

List of internal components for QPNC-100/125 models with part numbers.

QPNC-150;200;250 External Parts List

List of external components for QPNC-150/200/250 models with part numbers.

QPNC-150;200;250 Internal Parts List

List of internal components for QPNC-150/200/250 models with part numbers.

Dimensional Drawings

QPNC-75 Dimensional Drawing

Visual representation of the QPNC-75 dryer with all dimensions.

QPNC-100;125 Dimensional Drawing

Visual representation of the QPNC-100/125 dryers with all dimensions.

QPNC-150 to 250 Dimensional Drawing

Visual representation of the QPNC-150 to 250 dryers with all dimensions.

Wiring Diagrams

QPNC-75 Wiring Diagrams

Electrical wiring schematics for QPNC-75 models (115V and 230V).

QPNC-100;125 Wiring Diagrams

Electrical wiring schematics for QPNC-100/125 models (115V and 230V).

QPNC-150;175;200;250 Wiring Diagram

Electrical wiring schematic for QPNC-150/175/200/250 models.

Quincy QPNC Series Specifications

General

Series	QPNC
Category	Dehumidifier
Dimensions (H x W x D)	Varies by model
Weight	Varies by model
Capacity Range	30-300 PPD
Voltage Options	460V
Airflow (CFM)	Refer to individual model specifications
Moisture Removal (PPH)	30-300 PPD