American Standard CH530 manual Head Relief Request Output, Maximum Capacity Relay

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Control System Components

Chilled and Condenser Water Flow Interlock Circuits

Proof of chilled water flow for the evaporator is made by the closure of flow switch 5S1 and the closure of

auxiliary contacts 5K1 on terminals 1X1-5 and 1A6-J3-2. Proof of condenser water flow for the condenser is made by the closure of flow switch 5S2 and the closure of

auxiliary contacts 5K2 on terminals 1X1-6 and 1A6-J2-2.

OPST Operation Status Option

Relay output modules 1A8 and 1A9 provide relay defaults shown (For other selections, see Installation Manual):

1A8 Optional Quad Relay

OPST

Relay #1

Chiller Non-Latching Alarm

J2-1 NO, J2-2 NC,

Output Status

 

 

 

J2-3 common

1A8 Optional Quad Relay

OPST

Relay #2

Chiller Limit

J2-4 NO, J2-5 NC,

Output Status

 

 

Mode Indicator

J2-6 common

1A8 Optional Quad Relay

OPST

Relay #3

Chiller Latching

J2-7 NO, J2-8 NC,

Output Status

 

 

Alarm Indicator

J2-9 common

1A8 Optional Quad Relay

OPST

Relay #4

Chiller Running Indicator

J2-10 NO, J2-11 NC,

Output Status

 

 

 

J2-12 common

1A9 Optional Quad Relay

OPST

Relay #1

Chiller Maximum Capacity

J2-1 NO, J2-2 NC,

Output Status

 

 

 

J2-3 common

1A9 Optional Quad Relay

OPST

Relay #2

Chiller Head

J2-4 NO, J2-5 NC,

Output Status

 

 

Relief Request

J2-6 common

1A9 Optional Quad Relay

OPST

Relay #3

Circuit 2

J2-4 NO, J2-5 NC

Output Status

 

 

Purge Alarm

to J2-6 common

1A9 Optional Quad Relay

OPST

Relay #4

Circuit 1

J2-1 NO, J2-2 NC,

Output Status

 

 

Purge Alarm

to J2-3 common

Head Relief Request Output

When the chiller is running in Condenser Limit Mode or in Surge Mode, the head relief request relay on the 1A9–J2-6 to J2-4 will be energized (1 minute default) and can be used to control or signal for a reduction in the entering condenser water temperature. Designed to prevent high refrigerant pressure trip- outs during critical periods of chiller operation.

If the unit is not equipped with the CDPR Enhanced Condenser Limit Option the unit will use the condenser refrigerant temperature sensor (input converted to saturated refrigerant pressure) to perform the Standard Condenser Limit function,

without the head relief request relay, by limiting inlet guide vane stroke and chiller capacity.

Keep in mind that Condenser Limit Control supplements the protection provided by the condenser pressure high pressure cutout switch 3S1.

Motor Temperature sensor module The motor temperature module 1A26 connects via unit wiring to the three motor winding temperature sensors. This module is located in the control panel where the module is connected to the IPC bus.

Default status relay selections are shown. Selections can be altered using service tool. Other choices are: Circuit 1 Running, Circuit 2 Running, Chiller Alarm, Circuit 1 Alarm, Circuit 2 Alarm, and Purge Alarm.

Maximum Capacity Relay

When the chiller has been operating at maximum capacity for 10 minutes (TechView adjustable) this relay will activate. Also upon being less than maximum capacity for 10 minutes this relay will deactivate.

Compressor Running Relay

Relay activates while compressor is running.

Machine Shutdown Manual Reset (MMR)

Limit warning machine shutdown auto reset relays will activate with such conditions for remote status indication.

CDHF-SVU01C-EN

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Contents X39640670030CDHF-SVU01C-EN Read these carefully Contents Unit Nameplate General InformationLiterature change About this manualGeneral Information = 560 3 stage 935 2 stage Y = 500 3 stage 835 2 stage Control Optional Packages Commonly Used AcronymsGeneral Duplex unit components front view OverviewGeneral Duplex unit components 2 stage compressor Compressor 1 or 2 2 Stage Cooling CyclePressure enthalpy curve 3 stage compressor Pressure enthalpy curve 2 stage compressor DynaView Human Interface TechView Chiller Service ToolTimeline Text Figures Power Up DiagramSoftware Operation Overview Diagram Software States FigureStaging Second Compressor On CDHE/F/G sequence of operation auto to runningSatisfied Setpoint Staging Second Compressor OffCDHF/G sequence of operation lead 1/lag CDHE/F/G sequence of operation lead 2 lag Fixed Sequence Compressor 2 / CompressorCDHF/G sequence of operation equalize starts and hours Sequencing Balanced Starts and HoursCDHF/G sequence of operation combined start Simultaneous Compressor Start/ StopClear Restart Inhibit Restart Inhibit Start to Start Time SettingRestart Inhibit Restart Inhibit Free StartsOil and Refrigerant Pump Surface TemperaturesOil refrigerant pump circuit 1 or 20 100 percent RLA Base Loading Control AlgorithmGeneral Information Sequence of operation ice making running to ice making Ice Machine ControlHot Water control Control Panel Devices and Unit Mounted Devices Unit Control Panel UCPUnit Control Panel UCP User-defined language support Variable water flow through the evaporatorDynaView main processor Operator InterfaceOperator Interface How It Works Chiller Stop Prevention/Inhibit FeatureTop Level Mode Description System Reset Reference Main Screen Data Fields Table Chiller Operating ModeCircuit Operating Mode Main ScreenDiagnostic Screen Back button provides navigation back to the chiller screen Operator Interface Reports Report MenuReport name Circuit Condenser Report name System EvaporatorReport name Circuit Evaporator Report name System CondenserReport name System Ashrae Chiller Log Historic Diagnostics LogHeader Screen Setting Tab screens provides a userChiller Feature SettingsPurge System Mode OverridesCircuit Mode Overrides Display SettingsOperator Interface Operator Interface Operator Interface Operator Interface Operator Interface Binding Interprocessor CommunicationInter Processor Communications IPC3 IPC3 Definitions Bus Management Control panel components layout Control System ComponentsControl System Components Control Panel Devices Compressor Running Relay Machine Shutdown Manual Reset MMRHead Relief Request Output Maximum Capacity RelayExop Refrigerant Monitor Input 1A17Cdrp Condenser Refrigerant Pressure Output Trmm TRM4 Tracer Comm 4 interfaceEpro Enhanced Protection Pressure based Temperature basedCdrp Refrigerant Pressure Output Option 1A15 Condenser Pressure OutputRefrigerant Differential Pressure Indication Output Percent RLA Output Gbas Generic Building Automation SystemWpsr WFC Water Pressure Sensing Option Module CharacteristicsExternal Chilled Water Setpoint Ecws External Current Limit Setpoint1A13, 1A18, 1A19, 1A20 Dual Binary input module 1A8, 1A9, 1A11, 1A12 Quad Relay Output Status1A14 Communication interface Module 1A15, 1A16, 1A17, 1A21 Dual Analog Input/output Module Recommended Length to Run external Output signalsAnalog Input Unit mounted devices Control System Components Control System Components Electrical Sequence Control Sequence of OperationUCP and Wye-Delta Starter Control Circuits Delay time 200 msec. Opens 2K1 Control Sequence of Operation Test and start timing sequence Control Sequence OperationAFD Machine Protection Adaptive Control Momentary Power Loss MPL ProtectionOverload trip time versus percent RLA Current Overload ProtectionCurrent Limit Protection Phase Loss ProtectionReverse Rotation Protection SoftLoading Differential to Start or StopMinimum and Maximum Capacity Limit Evaporator Limit Leaving Water Temperature CutoutHead Relief Relay Low Refrigerant Temperature CutoutCutout strategy Condenser Limit Restart Inhibit High Vacuum Lockout Oil Temperature Control Return Water Controls Chilled Water Reset CWROutdoor Air Temperature Maximum ResetEquation Values for start reset typesDegrees of Reset Constant ReturnOutdoor air temperature versus degrees of reset Reset RatioReset function for return CWR Reset Ratio = 50% Return CWR Unit Startup Unit Start-Up ProceduresDaily Unit Start-Up Mode Live Electrical ComponentsToxic Hazards Seasonal Unit Start-UpSeasonal Unit Shutdown Unit Shutdown ProceduresUnit Shutdown Oil Pump Heater OperationRecord Keeping Forms Periodic MaintenanceDaily Maintenance and Checks Moisture ContaminationEvery 3 Months Weekly MaintenanceNormal Chiller Operating Characteristics Hazardous Voltage w/CapacitorsAnnual Maintenance Off-Season MaintenanceCompressor Oil Change Oil MaintenanceOil Change Procedure Heater DamageReplacing Oil Filter Oil Filter ReplacementHazardous Voltage w/ Capacitors MaintenanceOil Supply System Problems Other Maintenance RequirementsFront View with Refrigerant Pump Rotary valve in drain positionRefrigerant Charge Contains RefrigerantProper Water Treatment Recovery and Recycle ConnectionsLeak Testing Cleaning the CondenserControl Settings Adjustments Cleaning the EvaporatorUnit Corrosion Damage Unit Preparation Purge System103 104 105 106 107 108 109 110 111 112 113 114 115 Trane
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