EVAPCO AT Series User Manual

Operation and
Maintenance Instructions
For EVAPCO Closed Circuit Coolers and
Evaporative condensers
for LIFE
Internat iona l In stitute of
Ammo nia Refrigeration
www.iiar.org
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EVAPCO AT Series Specifications

General

Brand	EVAPCO
Model	AT Series
Category	Accessories
Language	English

Summary

Introduction, Safety, and Terminology

Safety Precautions

Guidelines for safe operation, maintenance, and repair of equipment to prevent injury.

Start-Up Procedures and Checklist

General Start-Up Verification

Checks installation, safety interlocks, VFD settings, and water treatment plans.

Specific Start-Up Steps and Post-Energization Checks

Recommended Minimum Maintenance Schedule

Seasonal Shut-Down Checklist

Sequence of Operation: Wet/Evaporative Mode

Fan System Maintenance

Fan Motor and Shaft Bearing Lubrication

Guidance on lubricating fan motor and shaft bearings with recommended greases.

Fan Belt Adjustment Procedures

Induced Draft Motor Adjustment

Forced Draft Motor Adjustment

Fan System Capacity Control Methods

VFD Lockout and Resonant Frequencies

Two-Speed Motors and Operation Sequences

Recirculated Water System Routine Maintenance

Suction Strainer Cleaning

Procedure for cleaning the suction strainer in the cold water basin.

Cold Water Basin Maintenance

Operating Water Level Checks

Checking and maintaining the correct water level in the cold water basin.

Water Make-Up Valve and Distribution System Checks

Pump and Bleed-Off Valve Checks

Water Treatment and Chemistry Fundamentals

Water Chemistry Parameters and Biological Contamination Control

Cold Weather Operation Overview

Freeze Protection for Closed Circuit Cooler Coils

Unit Accessories and Cold Weather Capacity Control

Ice Management Strategies

Troubleshooting Common Issues

Fan/Motor and Spray System Problems

Pump/Valve and Water Level Problems

Material and Electric Water Level Control Issues