EVAPCO AT Series - Table of Contents

2
Operation and Maintenance Instructions
Table of Contents
Introduction . . ...............................................................................3
Safety Precautions ...........................................................................3
Initial Storage and/or Idle Period Recommendations ...............................................3
InternationalBuildingCodeProvision ...........................................................3
Initial and Seasonal Start-Up Checklist ...........................................................4
General ................................................................................4
InitialandSeasonalStart-Up ...............................................................4
Maintenance Checklist ....................................................................5
Seasonal Shut-Down Checklist .............................................................7
FanSystem .................................................................................7
FanMotorBearings ......................................................................7
FanShaftBearings .......................................................................7
Recommended Bearing Lubricants ..........................................................7
Fan Belt Adjustment ......................................................................8
Fan and Motor Sheave Alignment ...........................................................8
Fan System Capacity Control ..............................................................10
Fan Motor Cycling .................................................................10
TwoSpeedMotors .................................................................10
VariableFrequencyDrives ...........................................................11
RecirculatedWaterSystemRoutineMaintenance .................................................12
ColdWaterBasin .......................................................................12
Suction Strainer Assembly ................................................................12
OperatingWaterLevels ..................................................................12
Water Make Up Valve . . . .................................................................13
Pressurized Water Distribution System ......................................................13
Drift Eliminator Orientation ...........................................................15
WaterTreatmentandWaterChemistryoftheRecirculatedWaterSystem .............................16
BleedOff ..............................................................................16
Biological Contamination .................................................................16
Air Contamination .......................................................................16
WaterChemistryParameters ..............................................................17
PassivationofGalvanizedSteel ............................................................18
WhiteRust .......................................................................18
UseofSoftWater .......................................................................19
UseofGrayWater .................................................................19
StainlessSteel ..............................................................................19
Maintaining the Appearance of Stainless Steel ................................................19
Cleaning Procedures for Stainless Steel .....................................................20
Cold Weather Operation ......................................................................20
ReplacementParts ..........................................................................23
Part Identification Drawings ...............................................................24
ICT 4ʼ Wide Towers ................................................................24
AT/USS 6ʼ, 8ʼ & 8.5ʼ Wide Towers . . . . . . ...............................................25
AT/USS 10ʼ, 12ʼ, & 14ʼ Wide Towers . . . . . . . . . . . . .......................................26
AT/USS 12ʼ, 15ʼ & 17ʼ Wide End Connection Towers . . ....................................27
AT/USS20ʼ&24ʼWideTowers .......................................................28
AT/USS 28ʼ Wide Towers . . . . . . . . . . . . ................................................29
UT 6ʼ, 7.5ʼ, 8ʼ & 8.5ʼ Wide Towers . . . . . . . ..............................................30
UT 10ʼ, 12ʼ, & 14ʼ Wide Towers . . . . . . . . . . . ............................................31
UT 12ʼ, 15ʼ & 17ʼ Wide End Connection Towers . . . . . . . . . . . ...............................32
UT20ʼ&24ʼWideTowers ...........................................................33
UT 28ʼ Wide Towers . . . . . . ..........................................................34
LPTUnits ........................................................................35
LSTA 4ʼ Wide Units . . ..............................................................36
LSTBUnits.......................................................................37
Notes............................................................................38