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EVAPCO ESWA - User Manual

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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
†

Table of Contents

Other manuals for EVAPCO ESWA

Preview: Operation And Maintenance Instruction Manual
Operation And Maintenance Instruction Manual12 pages

Questions and Answers

  • E
    emma04Aug 18, 2025
    What to do if EVAPCO Accessories fan motors are overamping?
    • L
      Lucas ClementsAug 18, 2025
      If EVAPCO Accessories fan motors are overamping, several factors could be responsible. It could be due to a reduction in air static pressure. For a forced draft unit, make sure the pump is on and water is flowing over the coil. If the pump is off, and the unit wasn't designed for dry operation, the motor might over-amp. Also, check the voltage across all three legs of the motor for any electrical issues. Verify the fan rotates correctly, and if not, switch the leads. Ensure the fan and motor turn freely by hand, checking for internal damage or bearing issues. Finally, check for proper belt tension, as extreme tension can cause overamping.
  • C
    Chad RogersAug 20, 2025
    Why is my EVAPCO Accessories motor making unusual noise?
    • S
      slloydAug 20, 2025
      Unusual motor noise in EVAPCO Accessories can stem from various issues. The motor might be running single-phase; if you stop and try to restart it, it won't start again. Check the wiring, controls, and the motor itself. Incorrectly connected motor leads could also be the culprit, so verify the connections against the wiring diagram on the motor. Bad bearings are another potential cause; check the lubrication and replace the bearings if necessary. An electrical unbalance, where voltage and current are uneven across the three lines, can also lead to unusual noise, so check and correct if needed. Also, inspect for a non-uniform air gap and rotor unbalance and correct bracket fits or bearing, rebalance, reinstall or replace the fan if required.
  • E
    Eric AndersonAug 23, 2025
    How to fix an incomplete spray pattern in EVAPCO Accessories?
    • E
      Emma SantiagoAug 23, 2025
      An incomplete spray pattern in EVAPCO Accessories could be due to several reasons. The nozzles might be clogged, in which case you should remove and clean them, and flush the water distribution system. Another possibility is that the pump is running backwards; visually verify the pump rotor rotation by turning the pump off and then on, and verify the amp draw. Inadequate pump flow for a remote sump could also be the issue; confirm the inlet pressure at the header meets recommended valves and adjust the cylinder to provide blade tip clearance. Finally, check for a clogged strainer by removing and cleaning it.
  • M
    Mrs. Jessica Patterson DDSAug 26, 2025
    What to do if the EVAPCO ESWA makeup valve will not shut off?
    • K
      Kenneth McgeeAug 26, 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).
  • T
    Tanya MartinAug 27, 2025
    Why are the EVAPCO Cooling boxes pump motors overamping?
    • M
      maddenshirleyAug 28, 2025
      If your EVAPCO Cooling boxes pump motor is overamping, especially if the unit has only run for a few hours, it might be due to the pump wear ring needing to wear in. This should only cause small percentage increases. If the issue persists, verify the pump can turn freely by hand; if not, it likely needs replacement. Also, ensure the pump has been wired correctly and that the supply voltage is accurate. Note that changes in pump flow due to clogged or blown nozzles should not cause overamping.
  • A
    Angela OdonnellAug 30, 2025
    What to do if the EVAPCO Cooling boxes cold water basin is overflowing?
    • M
      Michael ClarkAug 30, 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
    Mary MaxwellSep 1, 2025
    How to clean scaled inlet louvers on EVAPCO ESWA Cooling boxes AT units?
    • M
      Mike HartmanSep 1, 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.
  • D
    Daniel SinghSep 4, 2025
    Why is water constantly blowing out of the EVAPCO ESWA overflow connection?
    • J
      josephmillerSep 4, 2025
      Water blowing out of the overflow connection in EVAPCO Cooling boxes, particularly in forced draft units, can be 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 to ensure the overflow connection has been properly piped.
  • M
    Mark BallardSep 7, 2025
    Why is the stainless steel rusting on my EVAPCO ESWA Cooling boxes?
    • J
      jamiecarterSep 7, 2025
      Rust spots on the surface of your EVAPCO Cooling boxes typically aren't signs of the stainless steel corroding. Often, they result from foreign material like welding slag collecting on the surface. These spots can be removed with a good cleaning. EVAPCO recommends using either Naval Jelly or a good stainless steel cleaner, such as Mother’s Wax, along with a Scotch-Brite pad. Regular maintenance of the unit’s surface is advised.
  • L
    Lauren ThomasSep 9, 2025
    Why is the fluid cooler insulation cracking on my EVAPCO ESWA?
    • J
      Jennifer DouglasSep 9, 2025
      Most of the time, what appears to be cracking insulation on EVAPCO Cooling boxes is actually cracking paint. If the paint is degrading, it should be touched up to maintain the finish on the insulation. Maintaining the finish of the insulation paint should be part of your standard maintenance. If the insulation itself is cracking, consult your local Evapco representative.

Summary

Introduction and Safety

Safety Precautions

General safety guidelines for operating, maintaining, or repairing equipment.

Initial Storage and Idle Period Recommendations

Unit Start-Up Checklist

Recommended Maintenance Schedule

Seasonal Shut-Down Checklist

Basic Cooler;Condenser Sequence of Operation

Fan System Maintenance

Fan Motor Bearings Maintenance

Fan Shaft Ball Bearings Lubrication

Fan Belt Adjustment Procedures

Procedures for checking and adjusting fan belt tension for proper operation.

Induced Draft Belt Driven Unit Adjustment

Specific belt adjustment methods for induced draft units.

Forced Draft Belt Adjustment

Belt adjustment guidelines for forced draft units.

Fan System Capacity Control

Fan Motor Cycling for Capacity Control

Variable Frequency Drives (VFDs)

Multi-fan VFD Operation Guidelines

Two Speed Motors for Capacity Control

Two-Speed Motor Sequence of Operation

Recirculated Water System Maintenance

Suction Strainer Cleaning

Water Make Up Valve Adjustment

Pressurized Water Distribution System Check

Water Treatment and Chemistry

Bleed or Blowdown Procedures

Galvanized Steel Passivation

Water Chemistry Parameters

Recommended chemical parameters for water treatment.

Control of Biological Contamination

Measures to minimize risks from waterborne pathogens like Legionella.

Cold Weather Operation

Recirculating Water Freeze Protection

Methods to prevent freezing of recirculating water.

Closed Circuit Cooler Coil Freeze Protection

Protecting heat exchanger coils from freezing.

Cold Weather Capacity Control Methods

Strategies for managing unit capacity in cold weather.

Ice Management Strategies

Strategies to manage ice formation in extreme ambient conditions.

Troubleshooting Common Issues

Overamping Fan Motors

Causes and remedies for fan motors drawing excessive current.

Unusual Motor Noise Issues

Diagnosing and resolving abnormal motor noises.

Incomplete Spray Pattern Issues

Addressing issues with the water spray pattern.

Fan Noise Diagnosis

Scaled Inlet Louvers on AT Units

Overamping Pump Motors

Causes and remedies for pump motors drawing excessive current.

Makeup Valve Not Shutting Off

Troubleshooting makeup valve issues.

Electric Water Level Control Malfunctions

Troubleshooting electric water level control systems.

Replacement Parts Information

EVAPCO ESWA Specifications

General IconGeneral
ApplicationIndustrial
Heat Rejection CapacityVaries by model
Construction MaterialGalvanized steel
Cooling CapacityVaries by model
Sound LevelVaries by model
DimensionsVaries by model
WeightVaries by model

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