Sterling 30RA010-055 manual Operating Modes

Page 41

 

 

Table 23 — Operating Modes

 

 

 

MODE

ITEM EXPANSION

DESCRIPTION

NO.

 

 

01

FSM CONTROLLING CHILLER

Flotronic™ System Manager (FSM) is controlling the chiller.

 

 

 

02

WSM CONTROLLING CHILLER

Water System Manager (WSM) is controlling the chiller.

 

 

 

03

MASTER/SLAVE CONTROL

Dual Chiller control is enabled.

 

 

 

 

RAMP LOAD LIMITED

Ramp load (pull-down) limiting in effect. In this mode, the rate at which leaving fluid temperature

05

 

is dropped is limited to a predetermined value to prevent compressor overloading. See Cooling

 

Ramp Loading (CRMP) [Configuration, SLCT]. The pull-down limit can be modified, if desired,

 

 

 

 

to any rate from 0.2° F to 2° F (0.1° to 1° C)/minute.

 

 

 

06

TIMED OVERRIDE IN EFFECT

Timed override is in effect. This is a 1 to 4 hour temporary override of the programmed

 

schedule, forcing unit to Occupied mode. Override can be implemented with unit under

 

 

Local (Enable) or SCN (Sterlco Comfort Network) control. Override expires after each use.

 

LOW COOLER SUCTION TEMPA

Circuit A cooler Freeze Protection mode. At least one compressor must be on, and the Sat-

 

 

urated Suction Temperature is not increasing greater than 1.1° F (0.6° C) in 10 seconds. If

 

 

the saturated suction temperature is less than the Brine Freeze Point (BR.FZ) [Set Point,

07

 

FRZ] minus 3° F (1.7° C) and less than the leaving fluid temperature minus 14° F (7.8° C)

 

for 2 minutes, a stage of capacity will be removed from the circuit. Or, If the saturated suc-

 

 

 

 

tion temperature is less than the Brine Freeze Point (BR.FZ) [Set Point, FRZ] minus 14° F

 

 

(7.8 º C), for 90 seconds, a stage of capacity will be removed from the circuit. The control

 

 

will continue to decrease capacity as long as either condition exists.

 

 

 

 

LOW COOLER SUCTION TEMPB

Circuit B cooler Freeze Protection mode. At least one compressor must be on, and the Sat-

 

 

urated Suction Temperature is not increasing greater than 1.1° F (0.6° C) in 10 seconds. If

 

 

the saturated suction temperature is less than the Brine Freeze Point (BR.FZ) [Set Point,

08

 

FRZ] minus 3° F (1.7° C) and less than the leaving fluid temperature minus 14° F (7.8° C)

 

for 2 minutes, a stage of capacity will be removed from the circuit. Or, If the saturated suc-

 

 

 

 

tion temperature is less than the Brine Freeze Point (BR.FZ) [Set Point, FRZ] minus 14° F

 

 

(7.8° C), for 90 seconds, a stage of capacity will be removed from the circuit. The control will

 

 

continue to decrease capacity as long as either condition exists.

09

SLOW CHANGE OVERRIDE

Slow change override is in effect. The leaving fluid temperature is close to and moving

 

towards the control point.

 

 

 

 

 

10

MINIMUM OFF TIME ACTIVE

Chiller is being held off by Minutes Off Time (DELY) [Configuration, OPT2].

 

 

 

13

DUAL SETPOINT

Dual Set Point mode is in effect. Chiller controls to Cooling Set Point 1 (CSP.1) [Set Point,

 

COOL] during occupied periods and Cooling Set Point 2 (CSP.2) [Set Point, COOL] during

 

 

unoccupied periods.

 

TEMPERATURE RESET

Temperature reset is in effect. In this mode, chiller is using temperature reset to adjust leav-

14

 

ing fluid set point upward and is currently controlling to the modified set point. The set point

 

can be modified based on return fluid, outdoor-air-temperature, space temperature, or 4 to

 

 

 

 

20 mA signal.

 

 

 

 

DEMAND/SOUND LIMITED

Demand limit is in effect. This indicates that the capacity of the chiller is being limited by

15

 

demand limit control option. Because of this limitation, the chiller may not be able to pro-

 

duce the desired leaving fluid temperature. Demand limit can be controlled by switch inputs

 

 

 

 

or a 4 to 20 mA signal.

 

 

 

16

COOLER FREEZE PROTECTION

Cooler fluid temperatures are approaching the Freeze point (see Alarms and Alerts section

 

for definition). The chiller will be shut down when either fluid temperature falls below the

 

 

Freeze point.

 

 

 

17

LOW TEMPERATURE COOLING

Chiller is in Cooling mode and the rate of change of the leaving fluid is negative and

 

decreasing faster than -0.5° F per minute. Error between leaving fluid and control point

 

 

exceeds fixed amount. Control will automatically unload the chiller if necessary.

 

 

 

18

HIGH TEMPERATURE COOLING

Chiller is in Cooling mode and the rate of change of the leaving fluid is positive and increasing.

 

Error between leaving fluid and control point exceeds fixed amount. Control will automatically

 

 

load the chiller if necessary to better match the increasing load.

19

MAKING ICE

Chiller is in an unoccupied mode and is using Cooling Set Point 3 (CSP.3) [Set Point, COOL]

 

to make ice. The ice done input to the Energy Management Module (EMM) is open.

 

 

 

 

 

20

STORING ICE

Chiller is in an unoccupied mode and is controlling to Cooling Set Point 2 (CSP.2) [Set Point

 

COOL]. The ice done input to the Energy Management Module (EMM) is closed.

 

 

 

 

 

 

HIGH SCT CIRCUIT A

Chiller is in a Cooling mode and the Saturated Condensing Temperature (SCT) is greater than

21

 

the calculated maximum limit. No additional stages of capacity will be added. Chiller capacity

 

may be reduced if SCT continues to rise to avoid high-pressure switch trips by reducing con-

 

 

 

 

densing temperature.

 

 

 

 

HIGH SCT CIRCUIT B

Chiller is in a Cooling mode and the Saturated Condensing Temperature (SCT) is greater than

22

 

the calculated maximum limit. No additional stages of capacity will be added. Chiller capacity

 

may be reduced if SCT continues to rise to avoid high-pressure switch trips by reducing con-

 

 

 

 

densing temperature.

 

 

 

23

MINIMUM COMP ON TIME

Cooling load may be satisfied, however control continues to operate compressor to ensure

 

proper oil return. May be an indication of oversized application, low fluid flow rate or low loop

 

 

volume.

 

 

 

24

PUMP OFF DELAY TIME

Cooling load is satisfied, however cooler pump continues to run for the number of minutes set

 

by the configuration variable Cooler Pump Shutdown Delay (PM.DY) [Configuration, OPT1].

 

 

 

 

 

25

LOW SOUND MODE

Chiller operates at higher condensing temperature and/or reduced

 

capacity to minimize overall unit noise during evening/night hours (user-configurable).

 

 

 

SHORT LOOP OVERRIDE

Chiller is monitoring how fast compressor(s) is being cycled to maintain the desired leaving

26

 

fluid temperature. Control is limiting the rate of compressor cycling when this mode is active

 

to ensure proper oil return and also to prevent premature compressor failure. Low loop vol-

 

 

 

 

ume, low cooler flow and/or low chiller load are the primary causes for this mode.

 

 

 

41

Page 40 Page 42
Image 41
Page 40 Page 42
Contents SAFETY CONSIDERATIONS GENERAL CONTENTSControl Module Communication MAJOR SYSTEM COMPONENTSSterlco Comfort Network SCN Interface — Table 1 — Unit SizesTable 5 - SCN Communication Bus Wiring Table 3 — Status SwitchesTable 2 — Thermistor Designations Table 4 - Output RelaysLEGEND FOR FIG. Page Page 30RA010-018AQUA SNAP Fig. 3 — Wiring Schematic 30RA010-018SEE NOTE SEE NOTE AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATICFig. 3 - Wiring Schematic 30RA010-018cont 30RA022-030AQUA SNAP Fig. 4 - Wiring Schematic 30RA022-030AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATIC Fig. 4 - Wiring Schematic 30RA022-030cont30RA032-040AQUA SNAP Fig. 5 — Wiring Schematic 30RA032-040AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATIC Fig. 5 — Wiring Schematic 30RA032-040cont30RA042-055AQUA SNAP Fig. 6 — Wiring Schematic 30RA042-055AQUA-SNAPLOW VOLTAGE CONTROL SCHEMATIC Fig. 6 — Wiring Schematic 30RA042-055contESCAPEENTER Fig. 7 — Main Base BoardREMOTE CONTACT SW1 OFF ENABLE OFF SW2 ON MODEFig. 9 — Typical Space Temperature Sensor Wiring CEPL130351 Fig. 11 - Energy Management Module100/100 Fig. 12 — Deadband Multiplier Fig. 14 — 30RA Condenser Fan Sequence Fig. 13 — Operating Envelope forR-22Maneurop Compressor Cooling Set Point Select and control circuit power must be on Service Test See Table 11 — Both main powerTable 8 — Control Methods and Cooling Set Points Fig. 16 — Scrolling Marquee DisplayOptional Factory-InstalledHydronic Package — •Cooler Pump Control CPC Configuration, OPT1 ON Table 9 — Marquee Display Menu Structure Fig. 17 — Dual Chiller Thermistor LocationTable 10 — Run Status Mode and Sub-ModeDirectory SUB-MODE Table 12 - Temperature Mode and Sub-ModeDirectory Table 15 — Inputs Mode and Sub-ModeDirectory Table 13 — Pressure Mode and Sub-ModeDirectoryTable 14 — Set Point and Sub-ModeDirectory SUB-MODE Table 16 — Outputs Mode and Sub-ModeDirectoryKEYPAD DISPLAYKEYPAD SUB-MODEITEM DISPLAYKEYPAD SUB-MODEITEM DISPLAYTable 18 — Time Clock Mode and Sub-ModeDirectory PER.3 SUB-MODE Table 19 — Operating Mode and Sub-ModeDirectory Table 20 — Alarms Mode and Sub-ModeDirectoryITEM SUB-MODEKEYPAD ENTRY DISPLAYRSET DISP Table 23 — Operating Modes Table 25A — 4-20mA Reset Table 24 — Example of Reading and Clearing AlarmsTable 26B — Configuring Return Temperature Reset Temperature Control — No Reset Fig. 18 — Standard Chilled FluidFig. 19 — Outdoor-AirTemperature Reset Fig. 20 — Space Temperature ResetFig. 21B — Cooling Set Point 4 to 20 mA Fig. 21A — 4- to 20-mADemand LimitingTable 27 — Configuring Demand Limit TROUBLESHOOTINGand fluid tubing Table 28 — TroubleshootingRecommended that system be filled with an appro FU — Fuse GND — Ground Fig. 22 — Component Arrangement — 30RA010-030FU — Fuse GND — Ground Fig. 23 — Component Arrangement — 30RA032-040FU — Fuse GND — Ground Fig. 24 — Component Arrangement — 30RA042-055NOTES LEGEND Table 29 — Alarm and Alert Codes Table 29 - Alarm and Alert Codes cont ALARM Table 29 — Alarm and Alert Codes contALARM Table 29 — Alarm and Alert Codes contALARM Table 29 — Alarm and Alert Codes contCompressor Replacement Refer to Fig SERVICETable 30 - Unit Torque Specification Electronic ComponentsFig. 27 — Typical Compressor Mounting — All Sizes Fig. 28 — Compressor WiringFig. 29 — Compressor Location — 30RA010-030 Fig. 30 — Compressor Location — 30RA032-055Table 31 - Oil Charge Condenser Section and CoilsCheck Refrigerant Feed Components Fig. 31 — 30RA Access PanelsFig. 32 — Condenser-FanMounting Fig. 33 — Condenser-FanPosition Standard FanSwitch Fixed Table 32 — Factory Settings, High-PressureCompressor and Unit Protective Devices Check Unit SafetiesCOOLER FREEZE-UPPROTECTION TEMP TEMP For Thermistor T10 For Thermistor T10 Fig. 36 — Thermistor Connections to Main Base Board, J8 ConnectorFig. 35 — Fluid-SideTemperature Sensors T1 and T2 PROGRAMMING Mode •P51: SOFTWARE version Table 37 - Fault Codes•P50: FAULT HISTORY — Last 8 faults PARAMETERS Table 39 — Replacement Modules Minimum Loop Volume MAINTENANCEPRE-START-UP System CheckOperating Limitations Standard 30RA Units OPERATION SEQUENCETable 41 — Temperature Limits for SCN Tables A_UNIT General Unit Parameters APPENDIX ACIRCADIO Circuit A Discrete Inputs/Outputs CIRCA_AN Circuit A Analog ParametersOPTIONS Unit Parameters CIRCBDIO Circuit B Discrete Inputs/OutputsCIRCB_AN Circuit B Analog Parameters DISPLAY Marquee Display SETUP ALARMDEF Alarm Definition TableDUALCHIL Dual Chiller Configuration Settings BRODEFS Broadcast POC Definition TableOPTIONS2 Options 2 Configuration OPTIONS1 Options 1 ConfigurationSETPOINT SCHEDOVR Timed Override SetupRESETCON Temperature Reset and Demand Limit MAINTENANCE ALARMS: Maintenance DisplayUNIT DUALCHIL: Maintenance Display CURRMODS: Maintenance DisplayLOADFACT: Maintenance Display LEARNFNS Maintenance DisplayPM-STRN Maintenance Display PM-COIL:Maintenance DisplayPM-PUMP:Maintenance Display RUNTEST: Maintenance Display VERSIONS: Maintenance Display STRTHOUR Maintenance DisplayTESTMODE: Maintenance Display WSMDEFME: Maintenance Display AND MANUAL STARTERS FACTORY SETTINGS FOR COMPRESSOR, FAN, PUMPAPPENDIX B FACTORY SETTINGS FOR COMPRESSOR, FAN, PUMP AND MANUAL STARTERS contDataPort, DataLink, BAClink Object Definition APPENDIX CSETPOINT OPTIONSRemove and use for Job File I.Project Information START-UPCHECKLIST FOR 30RA LIQUID CHILLERII. Preliminary Equipment Check Design InformationStart and Operate Machine. Complete the Following III. Unit Start-UpCL-3 CL-4 Record Software Versions MODE — RUN STATUSCOMMENTS III.Unit Start-Upcont UNIT Configuration SettingsOPTIONS1 Options Configuration RSET Reset Configuration Settings OPTIONS2 Options ConfigurationIII.Unit Start-Upcont CL-6III.Unit Start-Upcont SLCT Setpoint and Ramp Load ConfigurationSETPOINT CL-7III.Unit Start-Upcont Service Test Mode and Sub-ModeDirectory
Top Page Image Contents