EVAPCO AT Series - User Manual

EVAPCO AT Series

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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

Member of

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† Mark owned by the Cooling Technology Institute

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Table of Contents

Other manuals for EVAPCO AT Series

Operation And Maintenance Instructions40 pages

Questions and Answers

M
Matthew BrownSep 12, 2025
How to clean scaled inlet louvers on EVAPCO Cooling boxes AT units?
- R
  Raymond ThompsonSep 12, 2025
  To clean scaled inlet louvers on EVAPCO Cooling boxes AT units, avoid using a power washer or wire brush as they can damage the louvers. Instead, remove the louver assemblies and soak them in the cold water basin of the unit. The water treatment chemicals present will help neutralize and dissolve the scale buildup. The soaking time depends on the severity of the scaling, assuming chemicals are in use.
C
Carla HolmesAug 25, 2025
Why is stainless steel rusting on my EVAPCO AT?
- J
  joytaylorAug 25, 2025
  If you notice rust on your stainless steel EVAPCO Accessories, it's usually not the stainless steel itself corroding. Often, it's foreign material like welding slag on the surface, especially around coil connections, the cold water basin near support steel, and field-erected platforms. Remove these rust spots by cleaning the surface regularly with a stainless steel cleaner and a Scotch-Brite pad.
J
Jessica WilliamsAug 27, 2025
Why is water constantly blowing out of the overflow connection in EVAPCO AT Accessories?
- R
  Ryan ParrishAug 27, 2025
  If water is constantly blowing out of the overflow connection in your EVAPCO Accessories, especially on forced draft units, it's likely due to positive pressure in the casing section. To resolve this, pipe the overflow with a P-trap to an appropriate drain. Also, verify the actual operating level against the recommended levels in the O&M manual.
T
Timothy GutierrezAug 29, 2025
How to fix unusual motor noise in EVAPCO AT Accessories?
- G
  George BrownAug 29, 2025
  If you're hearing unusual motor noise in your EVAPCO Accessories, here's what you can do: * First, stop the motor and try to restart it. If it doesn't restart and seems to be single phasing, check the wiring, controls, and motor. * Second, check the motor connections against the wiring diagram. * Third, check the lubrication and replace any bad bearings. * Fourth, check the voltage and current of all three lines, correcting if necessary. * Fifth, check and correct bracket fits or the bearing. * Sixth, rebalance, reinstall, or replace the fan.
M
Margaret PruittAug 30, 2025
Why is the cooling tower cold water basin overflowing in my EVAPCO Accessories?
- K
  Kaitlyn BairdAug 30, 2025
  If the cooling tower cold water basin is overflowing in your EVAPCO Accessories, it could be due to a problem with the make-up line. Refer to the Makeup Valve or Electronic Water Level section for guidance. Alternatively, if it's a multi-cell unit, there might be an elevation issue. Ensure that multi-cell units are installed level to one another, as uneven installation can cause overflowing in one cell.
N
Nicholas GallagherSep 1, 2025
How to clean scaled inlet louvers on AT units of EVAPCO AT Accessories?
- R
  rweeksSep 1, 2025
  If you observe scaled inlet louvers on your AT units of EVAPCO Accessories, note that this isn't necessarily a sign of a problem with the unit or water treatment. Avoid using a power washer or wire brush to remove the scale, as this could damage the louvers. Instead, remove the louver assemblies and soak them in the cold water basin of the unit. The water treatment chemicals will neutralize and dissolve the scale buildup. The soaking time depends on the severity of the scale.
D
Donna SmithNov 20, 2025
How to troubleshoot overamping fan motors in EVAPCO Accessories?
- B
  Brandon KennedyNov 20, 2025
  To address overamping fan motors in EVAPCO Accessories: * First, for a forced draft unit, ensure the pump is running and water flows over the coil. The motor may over-amp if the pump is off and the unit wasn't designed for dry operation. * Second, for ducted forced draft units, ensure the design ESP matches the actual ESP. * Third, check that the pump rotation is correct. Incorrect rotation reduces water flow and static pressure. * Fourth, check the basin water level against the recommended level, keeping in mind that air density affects AMP readings. * Fifth, check the voltage across all three legs of the motor. * Sixth, ensure the motor is wired per the diagram and connections are tight. * Seventh, confirm the fan rotates correctly, switching leads if necessary. * Eighth...
J
Joseph FitzgeraldNov 25, 2025
How to troubleshoot electric water level control issues in EVAPCO Accessories?
- D
  Dennis MillerNov 25, 2025
  If the electric water level control in your EVAPCO Accessories isn't working and the valve won't open or close, try these steps: 1. Make sure the water pressure is between 0.35 bar and 7.0 bar. 2. Check the wiring against the wiring diagram and verify the supply voltage. 3. Ensure there isn't a blockage in the Y-Strainer. 4. Confirm that the probes are clean. 5. Check the red LED on the circuit board; if it's on, the valve should be closed. 6. For a 3-Probe Assembly, simulate a "Low Water Condition" by lifting the probe assembly out of the stand pipe after cleaning the probes. The LED should be off, and the contact between "C" and "NC" should be closed, energizing the water makeup valve. 7. Simulate a "High Water Condition" by connecting a jumper wire between the longest and shorte...
G
Gary DavisSep 10, 2025
What to do if the EVAPCO Cooling boxes cold water basin is overflowing?
- M
  Melissa CookSep 10, 2025
  If the cold water basin of your EVAPCO Cooling boxes is overflowing, it could be due to a problem with the make-up line. Refer to the Makeup Valve or Electronic Water Level section for troubleshooting. If it's a multi-cell unit, ensure all cells are installed level with each other, as uneven installation can cause overflowing in one cell.
M
Mark SilvaSep 7, 2025
What to do if the EVAPCO Cooling boxes makeup valve will not shut off?
- B
  Bobby WaltersSep 7, 2025
  If the makeup valve on your EVAPCO Cooling boxes won't shut off, there are several potential causes. First, the make-up water pressure might be too high; for mechanical valves, it needs to be between 20 and 50 psi. A pressure reducing valve can lower excessive pressure. For electronic water level controls, the electrical actuator requires 5 to 125 psi. Other causes include debris in the solenoid (clean it out), a frozen float ball (inspect and replace if needed), or a float ball full of water (check for leaks and replace).

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

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