Emerson SZO44, SZV44, SZV32, SZO56 manual Oil Cooler Fan Control, Brushless DC Fan

Page 16

Dual-Compressor Module

Installation

 

 

2.6.2Oil Cooler Fan Control

The Compressor Module temperature is controlled by managing module oil flow and temperature. The module’s precise temperature control is critical to system performance and equipment life. Maintaining proper temperature control also reduces the possibility of gas condensing into liquids during operation.

Cooling fans require 24VDC, 4.5A (105 Watts) x 2 (9A 210W total) for the Compressor Module. Fan speed is controlled by a 0-10VDC control signal that is applied to the yellow lead on the fan terminal strip. Standard Compressor Modules use a nonlinear PTC thermistor to monitor oil temperature and provide a speed signal.

High temperature Compressor Modules use a linear NTC thermistor to monitor oil temperature. This signal is available to support a customer-provided fan speed control circuit.

All power connections are wired to terminal strips in a junction box on the Compressor Module.

Figure 6 Brushless DC Fan

+24VDC

DC common

RED

Blue

No connection feedback

White

0-10VDC speed signal

Figure 7 Basic Fan Control System

PTC Thermistor

Dropping ResistorIn Thermowell

One Fan 100 K Ohms

Two Fans 60.4 K Ohms

Yellow

Red Wire – 24VDC

Yellow Wire – 0-24VDC

Blue Wire – DC Common

To fan speed control

 

 

The PTC Thermistor is nonlinear and switches to high resistance in the 170-190°F (77-88°C) range.

10

2006SSD-75 R4 (10/10)

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Contents Copeland Scroll Compressor Module Page Table of Contents Appendix A Material Data Safety Sheet Figures Compressor Module Nomenclature Important Safety Information Safety Alert Symbol Safety Symbols Used in This ManualIntroduction Compressor ModuleOil coolers with fans Compressor Package CompressorInlet gas scrubber for liquid removal Installation Guidelines General Installation GuidelinesInlet and Discharge Pressures Required Component-Inlet Gas ScrubberBarg Setting Ambient Temperature RangeModule Weight Lbs. kg Installation Clearance and Dimensions Compressor Module Dimensions, in. mmProcess and Instrumentation Diagrams P&IDs Code DescriptionSwitches SwitchStatusElectrical Controls General ConsiderationsOil Cooler Fan Control Brushless DC FanTemperature Control SZO44Variable Speed DriveCompressor Power data based on 480VAC Variable Speed Typical Compressor Module power supply requirementsElectrical Requirements Wiring Control Circuit TerminationsPre-Startup Checklist Post-Startup ChecklistInitial Startup Compressor Module OperationCheck for These Conditions Under Normal Operation Maintenance Routine MaintenanceMaintenance summary Maintenance Tools Maintenance ToolsChecking the Oil Level Oil Capacity and TypeOil Level Guidelines Minimum Speed Oil Level Guidelines Maximum SpeedTopping Off the Oil Level Adding and Removing OilAdding Oil Changing the Oil Draining OilReplacing Oil Cleaning the Inlet Screen Servicing the Scavenge Line OrificeChanging the Second-Stage Separator Element Changing the Oil Filter ElementTroubleshooting Guide TroubleshootingMotor Winding Resistance Motor winding resistancePlatform Symptoms Diagnosis Platform troubleshooting guidelinesSpecifications Compressor Module Specifications Dual-Compressor Module Technical Support and Service Configuration Suction Max Flow/HP as a function of discharge110 130 140Flow rate 110 120150 180Appendix A - Material Data Safety Sheet SupplierEmergency Number 989 Product Name and Information Components and Hazard StatementSpill or Leak Procedures Fire and Explosion HazardsReactivity Data Health Hazard DataPage Page Page Page EmersonClimate.com
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