AEC PCA SERIES - User Manual

Questions and Answers

J
Jessica AndersonJul 31, 2025
How to troubleshoot an AEC PCA that will not run?
- M
  Michael HowardJul 31, 2025
  If your AEC Chiller isn't running, several factors could be at play. First, check the main disconnect fuses, wiring, and power lead to the unit to ensure it's receiving power. Verify that the supplied voltage is within plus or minus 10% of the nameplate rating. Other potential causes include a defective on/off switch (which would need replacement), a blown control circuit fuse (replace it and inspect the transformer), or a defective control transformer (also requiring replacement).
B
brownpatriciaAug 5, 2025
What to do if the pump runs, but the compressor will not in my AEC Chiller?
- M
  michael25Aug 5, 2025
  If the pump in your AEC Chiller is running but the compressor isn't, start by checking the refrigerant charge. If the sight glass isn't clear while the compressor runs, and you observe bubbling or foaming, it may indicate a problem requiring professional attention. Additionally, inspect the condenser for dirt or obstructions that might be causing the refrigerant high-pressure cutout switch contacts to open. Other potential issues include a defective fan motor (repair or replace), an open compressor internal overload (allow time to cool and reset), or a broken wire in the compressor control circuit (locate and repair).
C
Calvin MillerAug 10, 2025
Why does the compressor cycle at short intervals on my AEC Chiller?
- A
  Antonio BakerAug 10, 2025
  If the pump is running, but the compressor cycles at short intervals, it could be due to a low refrigerant level. In this case, check the refrigerant charge. Alternatively, there might not be enough process load on the chiller. Try increasing the process load.
J
Juan DeleonAug 16, 2025
What to do if my AEC PCA Chiller runs continuously but has insufficient cooling power?
- N
  Natasha ClarkAug 16, 2025
  If your AEC Chiller runs continuously but doesn't provide enough cooling, the condenser airflow might be restricted; try cleaning the condenser. Other potential causes include the unit being low on refrigerant, an inefficient compressor, or the unit being undersized for the application.
B
brenthaasAug 20, 2025
Why is the leaving water temperature too high in my AEC PCA Chiller?
- T
  tinagrahamAug 20, 2025
  If the leaving water temperature of your AEC Chiller is too high, start by checking the refrigerant charge. Also, verify that you're using the correct water/glycol solution; it should be 75% water and 25% glycol.
Z
zboyerAug 26, 2025
What causes high pump pressure in an AEC Chiller?
- J
  Justin JeffersonAug 26, 2025
  If the pump pressure in your AEC Chiller is too high, it's likely due to restricted water flow. Check for partially closed valves and ensure all lines are properly sized.

Summary

Safety Considerations

General Information

Introduction

Overview of the PCA Series Water Chillers' capabilities and intended use.

Necessary Documents

Lists essential documentation required for chiller installation and operation.

Models Covered

Identifies the specific PCA Series chiller models addressed by this manual.

Available Options

Details optional features and configurations available for PCA Series chillers.

Uncrating Your New Chiller

Step-by-step instructions for safely removing the chiller from its packaging.

Handling Shipping Damages

Procedure to follow in case of damage discovered upon shipment receipt.

Incomplete Shipments

Actions to take if the chiller shipment is incomplete or incorrect.

Product Returns

Guidelines for returning damaged or incorrect chiller items.

Chiller Installation

Electrical Connections

Instructions for safely connecting the chiller's electrical power supply.

Process Water Connections

Guidelines for connecting the chiller to the process water system.

Condenser Air Supply Requirements

Requirements for adequate airflow to the chiller's condenser for cooling.

Water Reservoir Management

Information on filling and using the chiller's water reservoir with glycol solution.

Overhead Process Piping

Addressing potential issues with elevated piping in process water systems.

Sequence of Operation

Chilled Water Circuit Operation

Describes the flow and cooling process of the chilled water within the chiller.

Refrigeration Circuit Operation

Explains the operational cycle of the refrigerant within the chiller system.

High Pressure Cutout Safety

Details the high pressure safety feature and its operating parameters.

Low Pressure Cutout Safety

Details the low pressure safety feature and its operating parameters.

Remote Start;Stop Interlock

How to connect the chiller for remote operation via external controls.

Startup Checklists

Startup Introduction

Overview of the startup procedures and the importance of qualified technicians.

Pre-Startup Checklist

Essential checks to perform before powering on the chiller for the first time.

Startup Checklist

Step-by-step guide for operating the chiller after initial power-up.

Water Circuit Pressure Drop Table

Table showing pressure drop values for different flow rates in the water circuit.

Microprocessor Control

Microprocessor Control Introduction

Overview of the PID controller used in PCA Series chillers.

Setting Process Water Temperature

Instructions on how to adjust the desired process water temperature setpoint.

Microprocessor LED Indicators

Explanation of the various LED indicators on the controller and their meanings.

Temperature Controller Key Functions

Description of the buttons used to navigate and control the microprocessor.

Auto-Tuning Chillers

Guide on using the auto-tune function to optimize controller performance.

Optional Communications Setup

Information on connecting the chiller for remote monitoring and control via computer.

Optional Graphic Panel

Graphic Panel Indicator Lights

Explains the function of indicator lights on the optional graphic control panel.

Graphic Panel Switches

Describes the function of the switches on the optional graphic control panel.

Routine Maintenance

Routine Lubrication

Schedule and procedure for lubricating the chiller's motors.

Condenser Maintenance Procedures

Instructions for cleaning and maintaining the chiller's condenser for optimal performance.

Troubleshooting Guide

PCA Unit Parts List

Technical Assistance

Parts Department Contact

Contact information and procedures for ordering replacement parts.

Service Department Support

Contact information for technical support and emergency service.

Sales Department Information

Contact information for sales inquiries and locating representatives.

Contract Department Services

Information on services offered for system installation and project management.

AEC PCA SERIES Specifications

General

Brand	AEC
Model	PCA SERIES
Category	Chiller
Language	English