Amcot ST Series Operation And Maintenance Instructions
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Amcot ST Series Operation And Maintenance Instructions

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OPERATIONS AND MAINTENANCE
INSTRUCTIONS
ST SERIES COOLING TOWERS
AMCOT COOLING TOWER CORPORATION
1-800-444-8693
WWW.AMCOT.COM
SALES@AMCOT.COM
LAST REVISED: 04/18
DOCUMENT: STOM0418

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  • Page 1 OPERATIONS AND MAINTENANCE INSTRUCTIONS ST SERIES COOLING TOWERS AMCOT COOLING TOWER CORPORATION 1-800-444-8693 WWW.AMCOT.COM SALES@AMCOT.COM LAST REVISED: 04/18 DOCUMENT: STOM0418...

  • Page 2: Table Of Contents

    AMCOT ST SERIES FIBERGLASS COOLING TOWER TABLE OF CONTENTS SECTIONS PAGES Introduction Safety Precautions Inspect Your Shipment General Overview Principle of Operation Tower Construction General Operating Precautions Startup Inspection Checklist Startup Procedures Preventative Maintenance Checklists Monthly Quarterly, Semi-Annual Annual General Maintenance...

  • Page 3: Introduction

    AMCOT ST SERIES FIBERGLASS COOLING TOWER INTRODUCTION We would like to first say thank you for your business and purchase of an Amcot ST Series, open loop, counter flow, water cooling tower. Amcot strives to provide all of our clients with the highest level of customer service and quality products.

  • Page 4: Safety Precautions

    Amcot is not responsible for any failures or damages to the cooling tower or it’s components in the event the unit is not properly installed.

  • Page 5: Inspect Your Shipment

    GENERAL OVERVIEW PRINCIPLE OF OPERATION The Amcot ST Series cooling tower is an open loop counter flow type of unit designed to remove excess heat from a water cooled system or application so that the equipment generating this heat can continuously operate within a specific temperature range.

  • Page 6: Tower Construction

    UV inhibitor additive which protects against decay or deterioration from ultraviolet light which is a natural occurrence. The Amcot ST Series cold water basin utilizes a sloped basin designed to facilitate proper water flow to the outlet pipe connection and promote positive head pressure for your circulating pump. The sloped basin also allows for complete water drainage to occur during maintenance, cleaning, or seasonal shutdown.
  • Page 7 Air inlet Louvers The air inlet louvers of the ST Series cooling tower is a PVC mesh screen which is designed to prevent debris and wildlife from entering the cooling tower. The air inlet louvers are designed so that they can be removed for cleaning or replacing.
  • Page 8 TOWER CONSTRUCTION Fan Blade Assembly For ST Series models ST-3 thru ST-30 the fan assemblies are fixed pitch type, constructed from nylon. The pitch angles are preset by the factory to ensure proper operation and maximum allowable air flow is being generated while maintaining proper motor amp draw.

  • Page 9: General Operating Precautions

    If you are unsure of who your local supplier is, please call Amcot at 1-800-444-8693 and we will be more than happy to assist you with finding an authorized dealer.

  • Page 10: Inspection Checklist

     Ensure your disconnect switch is properly installed and working.  Any safety interlocks should be tested.  When operating ST Series towers on inverter drives or Variable Frequency Drives, make sure the minimum speed requirements have been programmed. o Standard Fan Motors on the ST Series can be operated on variable frequency drives with an operating range of 20-60 hertz.

  • Page 11: Startup Procedures

    AMCOT ST SERIES FIBERGLASS COOLING TOWER STARTUP PROCEDURES GENERAL STARTUP GUIDELINES o Inspect all exterior surfaces of the cooling tower. o Inspect and check all fasteners. o Remove any debris such as dirt, leaves, rocks, or other foreign items that do not belong.

  • Page 12: Preventative Maintenance Checklists

    AMCOT ST SERIES FIBERGLASS COOLING TOWER PREVENTATIVE MAINTENANCE GENERAL OVERVIEW The following is a series of recommended preventative maintenance procedures that should be performed on your cooling tower to help provide the maximum service life of your unit and ensure it provides years of reliable performance.

  • Page 13: Quarterly, Semi-Annual

    AMCOT ST SERIES FIBERGLASS COOLING TOWER PREVENTATIVE MAINTENANCE QUARTERLY PROCEDURES QUARTERLY PROCEDURES Perform Monthly Checklist Cold Water Basin – Drain, Clean, Refill Basin Heaters – Check heater thermostat, clean probes, and inspect the heating element. (when applicable) Make-up Valve – check for operation and adjust.

  • Page 14: Annual

    AMCOT ST SERIES FIBERGLASS COOLING TOWER PREVENTATIVE MAINTENANCE ANNUAL PROCEDURES ANNUAL PROCEDURES DATE Perform Monthly Checklist Vibration Switches – Test and adjust sensitivity as needed. (when applicable) Inspect all seams for leaks Perform annual cooling tower cleanings by a licensed professional Inspect fill media for debris and condition.

  • Page 15: General Maintenance

    WATER DISTRIBUTION SYSTEM – SPRINKLER PIPE ASSEMBLIES General Overview Your ST Series water distribution assembly rotates based on the water returning to the tower. The force of this water fills the overall system and as the water exits through holes located on the sprinkler arms, this propels the assembly causing it to rotate.
  • Page 16 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE WATER DISTRIBUTION SYSTEM – SPRINKLER PIPE ASSEMBLIES Sprinkler Pipe Assemblies (ST-40 to ST-60) Sprinkler pipes on ST-40 to ST-60 are attached to the center sprinkler head by a threaded end connection and a lock nut which is designed to prevent the arms from becoming loose. In addition, these arms use a tension wire assembly to help prevent deflection when filled with water.
  • Page 17 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE WATER DISTRIBUTION SYSTEM – SPRINKLER PIPE ASSEMBLIES Sprinkler Pipe Assemblies (ST-70 to ST-1500) Sprinkler pipes on ST-70 to ST-1500 are attached to the center sprinkler head by a slip fit connection with set screws located on the sprinkler head point of connection. The assembly also uses a tension wire and turnbuckle assembly which extends from the center of the sprinkler head to the end of each sprinkler arm to help prevent deflection when filled with water.
  • Page 18 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE WATER DISTRIBUTION SYSTEM – SPRINKLER PIPE ASSEMBLIES - 18 -...

  • Page 19: Spray Head Assemblies

    AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE WATER DISTRIBUTION SYSTEM – SPRINKLER HEAD ASSEMBLIES Sprinkler Head If your sprinkler head fails to rotate smoothly during normal operation or if you see a lot of water coming out at the base of the sprinkler head, this is an indicator that the sprinkler head’s water seal is compromised.
  • Page 20 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE WATER DISTRIBUTION SYSTEM – SPRINKLER HEAD ASSEMBLIES Sprinkler Head (ST-70 thru ST-1500) Sprinkler heads on models, ST-70 to ST-1500 are constructed from aluminum or stainless steel. Sprinkler heads are secured to center riser pipe by a threaded connection.
  • Page 21 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE WATER DISTRIBUTION SYSTEM – SPRINKLER HEAD ASSEMBLIES Sprinkler Head Assembly Details If your sprinkler head fails to rotate smoothly this can often be a sign of damage to the internal seal/bearing or a result of hard water scale buildup occurring between the lower and upper sections of the sprinkler head assembly itself.
  • Page 22 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE WATER DISTRIBUTION SYSTEM – GENERAL DATA Sprinkler Head Identification When attempting to identify sprinkler heads on towers that have been in service for a long time, each sprinkler head has a factory marking, “LSH” model number, on the top of the sprinkler head. To help with identifying your sprinkler head or potential tower model number you can refer to the table below.

  • Page 23: Fill Media & Water Basin

    WATER BASIN The water basin on the Amcot ST Series is constructed of FRP similar to the casing of the tower. Overtime the basin will collect dirt and debris from the environment. Therefore it is recommended that the tower is always operated with the suction strainer in place which should be inspected and cleaned regularly.

  • Page 24: Inlet Louvers & Anti-Splash Louvers

    Amcot only recommends using the standard louver or the optional Anti-Splash Louver (ASL) option on the ST Series cooling tower. The ASL louver is an optional accessory that replaces the standard louver screen and is designed to prevent water splash out from occurring and minimize sunlight exposure to the basin which helps minimize biological growth.

  • Page 25: Pipe Connections/Float Valve Assembly

    AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE PIPE CONNECTIONS Your cooling tower is supplied with several points of connection for piping. The standard connections include the inlet, outlet, make-up, overflow, drain, and on larger units an automatic filler (Quick Fill) connection.
  • Page 26 Amcot ST towers are supplied with mechanical float valve assemblies that are attached to the make-up connection. Mechanical float valve assemblies consists of a plastic or brass valve, rod, and plastic float.
  • Page 27 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Pipe Connections Overflow Connection Your tower is fitted with an overflow connection (FPT) and overflow assembly. The overflow is designed to ensure that water level does not exceed a predetermined level which could cause structural damage to the basin or cause water to overflow out of the basin and flood the immediate area.
  • Page 28 AMCOT ST SERIES FIBERGLASS COOLING TOWER Pipe Connection Chart: MODEL INLET OUTLET MAKEUP QUICK FILL OVERFLOW DRAIN ST-3 1 1/2" 1 1/2" 1/2" 1" 3/4" ST-H-3 1 1/2" 1 1/2" 1/2" 1" 3/4" ST-5 1 1/2" 1 1/2" 1/2" 1"...

  • Page 29: Water Inlet Pressure

    GENERAL MAINTENANCE Inlet Water Pressure Your Amcot ST Series tower will perform best when the proper pump selection is made. When selecting your circulating pump, it is critical to ensure that the tower pump head (or inlet PSI) is incorporated into your pump’s total PSI or TDH (Total Dynamic Head) calculation.

  • Page 30: Ladders & Fan Guards

    ST tower. Fan Guards The Amcot ST-H-3 thru ST-30 towers are supplied with a one piece combination fan guard and motor bracket. This assembly is attached to the FRP casing panel and can be removed from the tower by simply removing the fasteners.

  • Page 31: Fan Assembly

    AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Mechanical System – Fan Assembly Fan Assembly & Balancing For ST-60 to ST-1500 fan assemblies, since they are adjustable pitch type of fans, it is important that they be properly set and balanced at the job site prior to operating to prevent damage to your equipment.
  • Page 32 Shutdown the motor, lockout the disconnect switch and visually inspect the fan assembly for damage. If you locate damage, please contact your distributor, representative, or Amcot immediately. It is not recommended that you operate the tower with a damaged fan installed.
  • Page 33 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Mechanical System – Fan Assembly The following is the pitch chart for the adjustable fans on models ST-60 to ST-1500. FAN PITCH FOR ST-60 TO ST-1500 MODELS PITCH MODEL PITCH ST-60 ST-300...
  • Page 34 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Mechanical System – Fan Assembly Fan Assembly Data FAN BLADE REFERENCE FAN DIAMETER TORQUE (FT-LBS) RATING MODEL NUMBER* (INCHES) (Adjustable Fan Blades) ST-3 LSF-050 19 1/2" ST-H-3 LSF-050 19 1/2" ST-5 LSF-050 19 1/2"...
  • Page 35 Motors – General Information Amcot fan motors are designed specifically for use on the ST Series cooling tower. Most of the ST Model towers ST-3 to ST-200 are direct drive motors, meaning the fan is directly secured to the motor’s output shaft.

  • Page 36: Motors

    AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MOTOR DATA Motor MODEL Phase Voltage Poles Frame Size Amp Draw Type ST-3 110/220 1250 2.8/1.4 TENV ST-H-3 110/220 1250 2.8/1.4 TENV ST-5 110/220 1250 2.8/1.4 TENV ST-H-5 110/220 1250 2.8/1.4 TENV ST-8...
  • Page 37 GENERAL MAINTENANCE Mechanical Systems Motors – Wiring WARNING: AMCOT RECOMMENDS THAT ALL MOTORS BE CONNECTED BY A LICENSED ELECTRICIAN TO ENSURE PROPER CONNECTION IS MADE TO PREVENT DAMAGE TO THE MOTOR ITSELF AND POSSIBLE INJURY TO THE INSTALLER. WARNING: DO NOT ATTEMPT TO CONNECT THE MOTOR TO LIVE WIRES. SERIOUS INJURY OR DEATH CAN OCCUR.

  • Page 38: V-Belt Reducer

    Prior to shipping the reducer with your unit at our facility, Amcot will inspect these components and in many cases we will attach the motor and reducer prior to shipping. When this occurs, Amcot will set the belt tension initially. HOWEVER, it is important to note that belt tension should always be verified at startup and within the first 48 hours of operation.
  • Page 39 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Mechanical Systems V-BELT DIAGRAMS - 39 -...
  • Page 40 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Mechanical Systems NOTES _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ - 40 -...
  • Page 41 AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Mechanical Systems V-Belt Reducers – Belt Tensioning For belt adjustment, remove the outer cover to your reducer. This will reveal the internal components. The adjustment assembly consists of an adjusting lever, gauge, spring, washer, and bolt. See below diagram.
  • Page 42 Belt Replacement Over time even with successful tensioning, your V-belts will require replacing. The following chart is the list of belts associated with the gear reducers for ST Series towers ST-225 to ST-1500. 1) Turn off unit and perform lockout/tag-out procedures 2) Remove the outer housing panel.
  • Page 43 Please refer to the V-belt diagram for the location of the various bearings. Below is a list of the Bearings found on the various Reducers and ST Series models ST-200 to ST-1500. BEARING TABLE; ST V-BELT REDUCERS; LBM TYPE...

  • Page 44: Seasonal / Prolonged Shutdown

    AMCOT ST SERIES FIBERGLASS COOLING TOWER GENERAL MAINTENANCE Prolonged (Seasonal) Shutdowns Some customers will not require their cooling towers to be operational during winter months of the year. In these cases, many owners will take their tower out of service for an extended period of time.

  • Page 45: Water Treatment

    Legionnaire’s disease which is a very serious and life threatening respiratory infection. While Amcot cannot provide specific water treatment guidelines, we recommend that owners consult a local water treatment specialist whom can provide a water treatment program that is customized to your specific water conditions and concerns.
  • Page 46 Solids filtration can be provided by incorporating basket strainers into your piping layout, or through the use of separators or sand filters. Amcot offers solids filtration systems and inline strainers should you seek to incorporate these into your system. For more information, contact Amcot or your manufacturer’s representative, and we will be happy to assist you.

  • Page 47: Troubleshooting

    AMCOT ST SERIES FIBERGLASS COOLING TOWER COOLING TOWER TROUBLESHOOTING GUIDE SCENARIO CAUSES SOLUTIONS 1. CHECK PIPING VALVES AND MAKE SURE DESIGN WATER 1. EXCESS OR LACK OF WATER FLOW FLOW RATE IS MAINTAINED. 2. MAKE SURE EQUIPMENT AIR INTAKE IS NOT BEING 2.
  • Page 48 HTTP://WWW.AMCOT.COM ©Copyright 2018. AMCOT LOGO is a registered trademark owned by Liang Chi USA Corporation, DBA Amcot Cooling Tower Corporation. Any reproduction of this document without written authorization is forbidden and a violation of copyright laws and will be prosecuted to the fullest extent by federal laws.

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