Emerson 3000/ITR manual Drycooler Settings, Aquastat settings-two-fan through four-fan drycoolers

Page 52

Component Operation and Maintenance

Manual Flushing—The valve may be flushed by rotating the socket head screw clockwise. This screw must be in the OUT position (counterclockwise) for normal valve operation.

Valve Disassembly

1.Shut off the water supply by using isolating valves.

2.Relieve the tension on the main spring by turning the adjusting screw (or collar) as far as it will go (provide a container to catch water below the valve).

3.Remove four screws extending through the main spring housing.

4.Remove the center assembly screws for access to all internal parts.

5.Clean the seat if possible. If the seat is pitted or damaged, replace the valve rubber disc and valve seat.

6.After valve is reassembled check for leaks.

7.Readjust head pressure control.

Testing Function of Valve—When the refrigeration system has been Off for approximately 10 to 15 minutes, the water flow should stop.

If the water continues to flow, the valve is either improperly adjusted (with head pressure too low) or the pressure sensing capillary is not connected properly to the condenser.

7.4.10Drycooler Settings

Applications with the Optional Stat Setting require field piping to be insulated to prevent condensa- tion. Table 8 shows acceptable applications where stats must be adjusted to Optional Setting. Aquastats must be field-adjusted to Optional Setting for:

•GLYCOOL/Dual Cool applications

•Single Drycooler loops with motor ball valve flow controls (motor ball valves are used on all Lie- bert Challenger 3000 and ITR units with digital compressors).

Table 8

Water/glycol system conditions requiring optional settings for aquastats

 

Cooling Type

 

Glycool

 

 

Glycol

 

 

 

 

 

 

 

 

 

Flow Control

MBV

WRV

MBV

WRV

 

 

 

 

 

 

 

 

 

Drycoolers in Loop

1

Multiple

1

Multiple

1

Multiple

1

Multiple

 

 

 

 

 

 

 

 

 

Stat Setting 1

Optional

Optional

Optional

Optional

Optional

Factory

Factory

Factory

Insulate Field Piping

Yes

Yes

Yes

Yes

Yes

No

No

No

 

 

 

 

 

 

 

 

 

 

1.See Table 9.

2.MBV=motor ball valve; WRV=water regulating valve

Table 9 Aquastat settings—two-fan through four-fan drycoolers

Dial Setting (Stat Open Temp) Set for Mid Differential 8°F (4.4°C) Rise to Close

 

 

Factory Setting

Optional Setting

Aquastat #

Fans

(Glycol) (see Notes 1 and 2)

(GLYCOOL) (see Note 3)

 

 

 

 

AQ1

F1

65°F (18.3°C)

35°F (1.7°C)

 

 

 

 

AQ2

F2 & F3

75°F (23.9°C)

45°F (7.2°C)

 

 

 

 

AQ3

F4

70°F (21.1°C)

40°F (4.4°C)

 

 

 

 

NOTE

1. All drycoolers are shipped at Factory Setting.

2.Factory Setting is used for all glycol applications, except single drycooler loops with motor ball valve controls.

3.Stats must be field-adjusted to Optional Setting for GLYCOOL/Dual Cool applications and all single drycooler loops using motor ball valve flow controls.

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Contents Operation & Maintenance Manual 50 & 60Hz Page Table of Contents Component Operation and Maintenance Standard AlarmsFigures Tables Important Safety Instructions Page System Descriptions IntroductionCompressorized Systems Glycool Chilled Glycol Cooling SystemsStartup Procedure StartupStartup Operation with Icom Control FeaturesLarge and Small Displays Liebert Icom Display Components and Functions Escape Key Down Arrow KeyKeyboard icons and functions Icon Key Name FunctionNavigating Through the Liebert iCOM Display Sensor Reading Next Maintenance Evaporator Fan Speed Time Most Recent AlarmsControl Interface-Three Main Menus Percent System or Unit Cooling On/Off DateAccessing Menus and Settings Viewing Data Entering the PasswordAfter highlighting the Password command line, press Password is factory-set atAccessing Submenus on Small Displays Accessing SubmenusAccessing Submenus on Large Displays Service Menu Unit Status Menu System ViewStatus Menu Unit 1 View User Menu Advanced Menu UnitService Changing Operational SettingsContacts Changing Liebert iCOM’s Display Settings Highlight the setting to be changed by pressing EnterGraphical Data Record Liebert iCOM Service Menu Icons and LegendNetwork Wiring for Unit-to-Unit Communications-U2U Wiring a Liebert iCOM U2U Network Small DisplaysSample Liebert iCOM network configurations Liebert iCOM U2U Ethernet NetworkWall-Mount Large Display Large DisplaysCombining Large and Small Displays on a U2U Network U2U network setup diagram Display Service/Network Liebert iCom Display MenuLiebert iCOM Display Components and Functions Liebert iCOM wiring-Unit as shipped 194273 194273 P65 P64 P61 P63 P67 P66Entering Network Setup Information Control board U2U network setup screenViewing Multiple Units with a Networked Large Display Service Menu Unit #Advanced Menu Unit # Single Unit Functions OperationUnit/Fan Control Start Stop Remote On / Off Display On / OffFan Alarm / Fan Protection Settings Loss of Power AlarmAutorestart High Pressure Alarm Digital Scroll High TemperaturePump Down-Air Cooled with Condenser Only Units Compressor TimingProportional Control Control TypesPI Control Intelligent Control Chilled Water Only Standard Alarms Alarm DescriptionsChange Filter Compressor OverloadHigh Temperature High Temperature and Low Temperature SimultaneouslyHumidifier Problem Infrared Humidifiers High Head PressureLoss of Power Low TemperatureLoss of Air Flow Low HumidityOptional Alarms Set Alarms-User MenusSystem Testing Component Operation and MaintenanceFan Safety Switch Control Transformer and FusesHigh-Temp Sensor Smoke DetectorRemote Shutdown Zone leak detection kit installation scenariosDistance From Unit, feet m Filters Blower PackageFan Impellers and Bearings BeltRefrigeration System Air DistributionSuction Pressure Suction pressures R407cAdjustment Discharge PressureSuperheat Thermostatic Expansion Valve OperationAir Cooled Condenser Outdoor fan/condenser configuration Water/Glycol Cooled Condensers Coaxial CondenserMotorized Ball Valve-Digital Scroll Compressor ControlControl Method StartupAdjusting Collar Nut Valve spring guideAquastat settings-two-fan through four-fan drycoolers Drycooler SettingsCooling Type Glycool Glycol Flow Control Compressor Replacement Compressor OilBefore Replacing or Returning a Compressor Compressor Functional CheckMechanical Failure Standard Scroll Compressor ReplacementElectrical Failure Digital Scroll Compressor Replacement Procedure Glycol Solution MaintenanceCleaning the Pan HumidifierInfrared Humidifier Removing the PanAutoflush Infrared Humidifier Cleaning System Changing Humidifier LampsAutoflush Operation Humidifier LampsAutoflush Controls Steam Generating HumidifierControls Replacing the Canister Humidifier canister part numbersPart Capacity Number Voltage Lb/hr kg/hr 200-460Circuit Board Adjustments Drain Tempering FeatureTroubleshooting Blower troubleshootingChilled water troubleshooting Symptom Possible Cause Check or RemedyCompressor and refrigeration system troubleshooting Compressor and refrigeration system troubleshooting Dehumidification troubleshooting Glycol pump troubleshootingInfrared humidifier troubleshooting See 7.5.1 Compressor FunctionalSteam generating humidifier troubleshooting Reheat troubleshooting Monthly Maintenance Inspection Checklist Semiannual Maintenance Inspection Checklist Semiannual Maintenance Inspection Checklist Page Ne t ItiPpor t Ti n That

3000/ITR specifications

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