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Main Chiller Controller Technical Guide

SECTION 4:

TROUBLESHOOTING

WARNING:

When using a single transformer to power more

than one controller or expansion module, the

correct polarity must always be maintained be-

tween the boards. Failure to observe correct

polarity will result in damage to the Main Chiller

Controller and its associated modules.

Please carefully read and apply the following information when
wiring the Main Chiller Controller, and its associated modules.

1. All wiring is to be in accordance with local and national

electrical codes and speciﬁ cations.

2. All 24 VAC wiring must be connected so that all ground

wires remain common. Failure to follow this procedure
can result in damage to the controller and connected
devices.

3. Minimum wire size for 24 VAC wiring should be

18-gauge.

4. Minimum wire size for all sensors should be 24-gauge.

Some sensors require 2-conductor wire and some require

3-or 4-conductor wire.

5. Minimum wire size for 24 VAC thermostat wiring

should be 22 gauge.

6. Be sure that all wiring connections are properly inserted

and tightened into the terminal blocks. Do not allow

wire strands to stick out and touch adjoining terminals

which could potentially cause a short circuit.

7. When communication wiring is to be used to intercon-

nect Main Chiller Controllers together or to connect to

other communication devices, all wiring must be

plenum-rated, minimum 18-gauge, 2-conductor, twisted

pair with shield. AAON can supply communication

wire that meets this speciﬁ cation and is color coded for

the network or local loop. Please consult your AAON

distributor for information. If desired, Belden #82760 or

equivalent wire may also be used.

8. Before applying power to the Main Chiller Controller

and its associated modules, be sure to recheck all wiring

connections and terminations thoroughly.

Important Wiring Considerations

Summary of Contents for SS1113

Page 1: ...Main Chiller Controller Technical Guide Main Chiller Controller Code SS1113 Version 1 00 and later Requires Touch Screen Software Version 1 00 and later Requires Prism 2 Software Version 4 8 3 and later ...

Page 2: ...information However in the interest of product improvement AAON reserves the right to change pricing speciﬁcations and or design of its product without notice obligation or liability AAON Part Number G019150 Rev 01A Copyright August 2018 AAON All rights reserved throughout the world AAON and AAONAIRE are registered trademarks of AAON Inc Tulsa OK Turbocor is a registered trademark of Danfoss Comme...

Page 3: ...ssembly E BUS Power Comm 1 5 Ft 3 Ft 10 Ft 25 Ft 50 Ft 75 Ft 100 Ft 150 Ft 250 Ft and 1000 Foot Spool V16720 1 5 Ft V16730 3 Ft V16740 10 Ft V16750 25 Ft V16760 50 Ft V16770 75 Ft V16780 100 Ft V36580 150 Ft V36590 250 Ft E BUS Adapter Hub with 1 5 Ft EBC Cable V17180 E BUS Adapter Board V15840 AAON Factory Technical Support 918 382 6450 techsupport aaon com NOTE Before calling Technical Support p...

Page 4: ...CE OF OPERATION 18 Refrigeration Loop Control 18 Compressor Control 18 Run Time Accumulation 18 Lead Lag Operation 18 Start Up 18 Staging 18 Modulation 19 Shutdown 19 Compressor Faults 20 Condenser Control 20 Start Up 20 Modulation 20 Shutdown 20 Expansion Valve Control 20 Start Up 20 Modulation 20 Shutdown 21 Economizer Subcool Module Management 21 VESTIBULE FAN COIL SEQUENCE OF OPERATION 21 COMP...

Page 5: ...Expansion Module Wiring 30 Compressor Circuit Module Wiring 31 Economizer Subcool Module Wiring 32 TROUBLESHOOTING 33 Main Chiller Components 33 Main Chiller Controller Chiller Expansion Module LED Locations 34 Compressor Circuit Module Economizer Subcool Module LED Locations 36 Thermistor Temperature Sensor Testing 37 Suction Pressure Transducer Testing 38 Discharge Pressure Transducer Testing 39...

Page 6: ...s definitions and ranges if applicable Control System Features Applications The G015540 Main Chiller Controller is only used with Turbocor Compressors in Chiller Operation The Controller is designed with 8 analog inputs 4 analog outputs 8 binary inputs and 8 relay outputs The Main Chiller Controller has an on board BACnet port for connection to a BACnet MS TP BAS network There are also 2 E BUS Exp...

Page 7: ...ystem Directly below the Touch Screen is a Rocker Switch Panel with switches to shut down the Unit and or each Compressor See Troubleshooting on page 17 for more information Touch Screen Features The Touch Screen provides the following useful functions Utilizes a graphical touch screen menu system with easy to understand menu options Graphical screens provide easy setup and operation without the n...

Page 8: ...isplay will broadcast the touch screen time to the Main Controller Sync Clocks will need to be done if the Main controller is powered down for a week or longer From the bottom of the Chiller Status Screen you can access all other screens in the program by clicking the icons System Overview Compressors Economizers Vestibule Setpoints and Alarms Faults The Alarms Faults icon s normal appearance will...

Page 9: ...Economizer Status Screen Vestibule Status Screen Press the Vestibule icon to access the Vestibule Status Screen See Figure 8 Press DONE to return to the Chiller Status Screen Figure 8 Vestibule Status Screen Figure 5 Compressors Screen Page 1 Press the Compressors icon to access the Compressor Status Screens See Figure 5 There are 2 Compressor Status Screens Press PAGE 2 to access the second scree...

Page 10: ... optionally press Cancel at the Password Setup Screen however this will leave the setpoints unprotected Touch the Username ﬁeld and use the pop up keyboard to enter a username and press Enter See Figure 11 Touch the Usercode ﬁeld and use the pop up keyboard to enter a password and press Enter Once you have established a username and password the program will ask you to enter them every time you ac...

Page 11: ...t setpoint will appear allowing you to use the data entry keypad to change the value The screen displays the name of the setpoint gives a brief description and includes the Minimum and Maximum values See Figure 13 Figure 13 Data Entry Screen Press OK to have the system accept the new value If you enter a setpoint that is not in the valid range the setpoint will remain as is and will not change Sta...

Page 12: ...iscellaneous Setpoints Screen Page 1 Figure 17 Miscellaneous Setpoints Screen Page 2 Setpoint Screens Calibration Setpoint Screen Press the Calibration icon to access the Calibration Setpoint Screen See Figure 18 Press DONE to return to the Chiller Status Screen or select another setpoint screen Figure 18 Calibration Setpoints Screen Expansion Modules Setpoint Screen Press the Exp Modules icon to ...

Page 13: ...bottom of the Main Faults Screen to access the Compressor Alarms 1 Screen See Figure 22 From the bottom of the Compressor Alarms 1 Screen you can select the Compressor 2 and Compressor 3 icons to access these compressor s alarms screens These icons too will be yellow to specify alarms or red to specify faults Press DONE to return to the Chiller Status Screen Figure 22 Compressor 1 Alarms Screen On...

Page 14: ...alve Economizers Expansion Valve Position Coil Temp Calculated Temp Suction Pressure Superheat Vestibule Vestibule Temp Cooling Setpoint Heating Setpoint Fan Coil Cool Enable Fan Coil Heat Enable Fan Coil Fan Enable Refrigerant Leak Detect Vent Fans Inlet Exhaust Dampers NOTE The lists that follow are all of the status setpoints and alarm items categorized per each screen in the Touch Screen Progr...

Page 15: ...ion Sensor Expansion Modules Compressor Pre Start Delay Load Balance EXV Steps per Second Calibration Leaving Water Oﬀset Entering Water Oﬀset Outdoor Air Oﬀset Vestibule Sensor Oﬀset Configuration 1 2 3 Compressor Modules Installed Has Compressor Lead Lag Enabled Alarms Faults Main Faults Water Flow Fault EM1 Board Missing Expan Board Missing Comp Mod 1 Missing Condenser Fault Comp Mod 2 Missing ...

Page 16: ...larm 11 Not Valid 12 13 Rear Radial Static Load X Alarm 14 Rear Radial Static Load Y Alarm 15 Compressor 1 3 Bearing Motor Faults Motor Single Phase Overcurrent Fault 0 DC Bus Overvoltage Fault 1 Motor High Current Warning 2 Motor High Current Fault 3 Inverter Error Signal Active 4 Rotor May Be Locked Fault 5 Bearing Fault 6 Bearing Warning 7 Motor Voltage Generates No Current 8 DC Bus Under Over ...

Page 17: ...ated on the Chiller Status Screen Figure 23 Chiller Rocker Switch Panel Unit Run Stop Compressor Disable There are 4 switches located below the Touch Screen that can be used to disable the compressors or force the unit to run See Figure 23 The switches labeled Circuit A B C allow for a direct disabling of each Compressor 1 2 or 3 These switches might be used if someone thinks there may be a proble...

Page 18: ...for enforcing a running compressor changeover to manage lead lag Startup 1 The Controller will wait for one of 4 run commands 1 1 Remote Start Stop activation Wet Contact on Binary Input 1 of the Main Controller 1 2 Remote Start Stop activation 5 0 VDC input on Chiller Expansion Module Input 3 1 3 Command via WattComms 1 4 Command via BACnet The WattComms and BACnet commands should aﬀect the same ...

Page 19: ...ressors have completed their startup cycle Stage Down and Minimum Run timers met 2 Selectthecompressortoshutdownbasedonwhetherlead lag or sequential operation is selected Lead lag operation Based on current accumulated run times for all running compressors select the compressor with the longest run time and signal it to shutdown do not wait for the shutdown to complete at this point Sequential ope...

Page 20: ...mine the condenser starting position based on a reset function with outside air temperature 3 Apply the condenser start position to all condenser fan controllers and maintain it through the fan bank startup sequence 4 Activate the condenser fan banks in a delayed startup stage based on a settable delay 5 Maintain the condenser start position for an additional delay following all banks starting 6 C...

Page 21: ...be followed these compressors do not have a forced emergency 1 Compressor demands are ignored at this point as the run enable signal is removed and the compressor module forces the Turbocor to run its shutdown sequence 2 Ignore minimum oﬀ times and minimum run times Vestibule Fan Coil Control Sequence The purpose of the fan coil control is to manage the environmental conditions in the vestibule on...

Page 22: ...uding all valve positioning operations Running Status This value should indicate if the compressor is running at beyond or below the demand Fault Status This value should indicate any faults in the compressor or within this module including indication that the Disable binary input is active Shutdown Status This is a binary indication that the board has completed all steps required for complete shu...

Page 23: ...tus for a period of about 75 seconds wait this time before attempting to communicate with the compressor 3 Check the compressor status and wait for indication that the compressor control has completed all initialization 4 Update the fault status as may be pertinent to the current condition of the compressor 5 Consider power up sequence completed and release the Disable hold Startup 1 When Compress...

Page 24: ...uring normal operation to determine if any operating failures have occurred These failures faults can be reported to the Panel PC with Touch Screen interface or to a computer running Prism 2 software The following are the available fault designations for the Main Chiller Controller No Flow No Water Flow has been detected once the butterﬂy valve has been opened Exp Lost One or more expansion boards...

Page 25: ...is a problem with one of the Condenser Fans No operational changes are made but the user is notiﬁed there is an issue that needs to be corrected in the condenser section Shutdown Fault A 24 VAC wet contact input is available to be used when an Emergency Stop or Phase Loss condition occurs If one of these contacts opens it will initiate shutdown of the Main Controller and will generate a fault cond...

Page 26: ...VDC 1 MCS Expansion Valves 1 thru 5 AO1 2 Condenser Fan VFD 1 thru 5 AO2 3 Butterﬂy Valve Actuator AO3 Binary Outputs 24 VAC 1 Condenser Fan 1 RLY1 2 Condenser Fan 2 RLY2 3 Condenser Fan 3 RLY3 4 Condenser Fan 4 RLY4 5 Condenser Fan 5 RLY5 6 Alarm Relay RLY6 Table 1 Main Chiller Controller Inputs Outputs CHILLER EXPANSION MODULE Analog Inputs 1 Vestibule Temperature Sensor T1 2 Liquid Line Tempera...

Page 27: ...G 2 Input Binary Inputs 1 Compressor Disable BIN1 Outputs 1 Load Balance Expansion Valve EXV 1 2 Turbocor Control MODBUS Binary Outputs 24 VAC 1 Isolation Valve R1 2 Compressor Enable R2 3 Load Balance Expansion Valve Active R3 Additionally each Compressor Circuit Module will communicate with and control its associated Compressor via Modbus from the Modbus Master port Table 3 Compressor Circuit Mo...

Page 28: ...Turbocor Compressors in Chiller Operation The Controller is designed with 8 analog inputs 4 analog outputs 8 binary inputs and 8 relay outputs The Main Chiller Controller has an on board BACnet port for connection to a BACnet MS TP BAS network The Main Chiller Controller provides Compressor demand management Condenser control and Expansion Valve control of the Turbocor Compressor in Chiller operat...

Page 29: ...nection of the Chiller Expansion Module 3 Compressor Circuit Modules and 3 Economizer Subcool Modules via EBC E BUS Cables The Main Chiller Controller must be connected to 18 30 VAC as shown in Figure 25 below Please see Table 8 page 40 for correct VA requirements to use when sizing the transformer s used for powering the Controller Also please note that when wiring the Main Chiller Controller its...

Page 30: ...r Expansion Module adds an additional 5Analog Inputs 5 Analog Outputs 3 Binary Inputs and 5 Conﬁgurable Relay Outputs Chiller Expansion Module Wiring Figure 26 Chiller Expansion Module Wiring The Chiller Expansion Module provides the following features Vestibule Temp Control Calculates Liquid Line Subcooling Refrigeration Leak Protection Signals to and from a Boiler The Chiller Expansion Module mu...

Page 31: ...em Each Compressor Circuit Module will communicate with and control its associated Compressor via Modbus from the Modbus Master port The Compressor Circuit Module must be connected to an 18 30 VAC power source See Figure 27 below for wiring The Compressor Circuit Module provides the following features Controls the operation of the Compressor via communications with the compressor control board Man...

Page 32: ...n be connected depending on the size of the system The Economizer Subcool Module must be connected to an 18 30 VAC power source See Figure 28 below for wiring Economizer Subcool Module Wiring Figure 28 Economizer Subcool Module Wiring The Economizer Subcool Module provides the following features Modulates the MCS Economizer Expansion Valves to maintain the Superheat Setpoint of the Sub Cooler Rece...

Page 33: ...Main Chiller Controller Technical Guide SECTION 4 TROUBLESHOOTING 33 Main Chiller Controller Components Figure 29 Main Chiller Controller Components ...

Page 34: ...0 seconds If there is an override the LED will blink 2 times every 10 seconds And ﬁnally if one of the outputs is in force mode the LED will blink 3 times every 10 seconds Communication LEDs EBUS ThisyellowLEDwillblinktosignalE BUScommunications LOOP COMM This yellow LED will light up and blink continuously to indicate the Main Chiller Controller is communicating BACNET This yellow LED will light ...

Page 35: ...er Controller Technical Guide SECTION 4 TROUBLESHOOTING 35 Figure 31 Chiller Expansion Module LED Locations Main Chiller Controller Expansion Module LED Diagnostics Figure 30 Main Chiller Controller LED Locations ...

Page 36: ...turn oﬀ and the Analog Outputs will go to 0 VDC ALARM above LCD display This red LED will light up and stay lit when there is an alarm present The type of alarm will display on the LCD display TheALARM LED also blinks when the expansion valve is initializing at startup COMM Every time the module receives a valid E BUS request from the Main Chiller Controller this LED will blink on and then oﬀ sign...

Page 37: ...emperature Resistance Voltage for Type III 10 K Ohm Thermistor Sensors Temp ºF Temp ºC Resistance Ohms Voltage Input VDC 10 23 33 93333 4 51 5 20 55 80531 4 45 0 17 77 69822 4 37 5 15 60552 4 29 10 12 22 52500 4 2 15 9 44 45902 4 1 20 6 66 40147 4 002 25 3 88 35165 3 891 30 1 11 30805 3 773 35 1 66 27140 3 651 40 4 44 23874 3 522 45 7 22 21094 3 39 50 10 18655 3 252 52 11 11 17799 3 199 54 12 22 1...

Page 38: ...tion Pressure Transducer is connected to the suction line Measure the Voltage at the SP and GND terminals and compare it to the appropriate chart depending on the refrigerant you are using If the temperature voltage or pressure voltage readings do not align closely with the chart your Suction Pressure Transducer is probably defective and will need to be replaced See the Suction Pressure Transducer...

Page 39: ...d to the discharge line Measure the Voltage at the terminals DP and COM terminals and compare it to the appropriate chart depending on the refrigerant you are using If the pressure voltage readings do not align closely with the chart your Discharge Pressure Transducer is probably defective and will need to be replaced Discharge Pressure Transducer Temp Pressure Voltage Chart for R134a Refrigerant ...

Page 40: ...ions General Correct wiring of the Main Chiller Controller and its modules is the most important factor in the overall success of the controller installation process The Main Chiller Controllers and Modules are factory installed and wired at the AAON factory Some of the following information may not apply to your installation if it was pre wired at the factory However if troubleshooting of the con...

Page 41: ...rs should be 24 gauge Some sensors require 2 conductor wire and some require 3 or 4 conductor wire 5 Minimum wire size for 24 VAC thermostat wiring should be 22 gauge 6 Be sure that all wiring connections are properly inserted and tightened into the terminal blocks Do not allow wire strands to stick out and touch adjoining terminals which could potentially cause a short circuit 7 When communicatio...

Page 42: ...ugh the Alarms Press to return to the ﬁrst Main Menu Screen Press to go to the Alarms Screen LCD Display Screen Navigation Keys The LCD display screens and buttons allow you to view status and alarms enable force modes and make BACnet conﬁguration changes See Figure 33 below and refer to Table 11 for descriptions Figure 33 LCD Display and Navigation Keys Table 11 Navigation Key Functions NAVIGATIO...

Page 43: ...use the UP DOWN arrow keys to select a number between 0 and 9 Settings Screens Refer to the following map when navigating through the Settings Screens From the Settings Screen press ENTER to scroll through the screens Settings MAC Addr 0 TO 127 BACnet CURRENT MAC ADDRESS Valid range is 0 to 127 Default is 1 The ENTER key moves the cursor between the digit ﬁelds starting with the ones ﬁeld Once the...

Page 44: ...croll through the screens Status OperMode UNOCCUPY LvgWater XX X LvgSetpt XX X LEAVING WATER TEMPERATURE OPERATION MODE This screen displays the current mode of operation Options are UNOCCUPY Unoccupied INITMODE RUN MODE EntWater XX X ENTERING WATER TEMPERATURE WaterVlv XXX OUTDOOR AIR TEMPERATURE RfgLevel XX X REFRIGERANT LEVEL Oat Temp XX X Demand XX X DEMAND PERCENTAGE LEAVING WATER TEMPERATURE...

Page 45: ...ain Controller CondFail The Condenser fault input has been lost so that indicates an alarm This doesn t aﬀect control Shutdown Either the Emergency Stop or the Phase Loss inputs on the Main Controller have set this condition or a Refrigerant Leak on the Chiller Expansion Module has occurred CompFail This alarm indicates a compressor fault has been received on the EBUS from the Main Controller Disa...

Page 46: ...STEM STATUS Screen Press to scroll through TBCOR MODULE Screens Press to scroll through TURBOCOR INFO Screens Press to scroll through ALARMS Screens Main Screen Map Module Screens Module Screens RefertothefollowingmapwhennavigatingthroughtheCompressor Circuit Module Screens From the TBCOR MODULE Screen press ENTER to scroll through the screens TBCOR 1 1808cXXX E BUS SOFTWARE 1808cXXX ADDRESS CURRE...

Page 47: ...usScreens FromtheSYSTEMSTATUSScreen press ENTER to scroll through the screens SYSTEM STATUS STATUS SPEED XXXXRPM ISO VLV STATUS Possible choices are OFF INIT STARTUP RUN SHUTDOWN SPEED RPM 4200 RPM LB VALVE XXX LOAD BALANCE VALVE MODULATING PERCENTAGE 0 100 ISOLATION VALVE OPEN or CLOSED TURBOCOR TURBOCOR STATUS Possible choices are NO COMM OFF STARTUP RUN SHUTDOWN DEMAND XX X DEMAND PERCENTAGE 0 ...

Page 48: ... READING FROM TEMPERATURE SENSOR INPUT DISCHARGE LINE TEMPERATURE 1 READING FROM TEMPERATURE SENSOR INPUT SUCTION PRESSURE READING FROM INPUT Sensor Status Screens RefertothefollowingmapwhennavigatingthroughtheSensorStatus Screens From the SENSOR STATUS Screen press ENTER to scroll through the screens SENSOR STATUS DISCHARGE XXX PSI DISCHARGE PRESSURE READING FROM INPUT SUCTION TEMPERATURE DIS TEM...

Page 49: ...PRESSOR CONTROL STATUS CONTROL MODE STATES 0 Levitate Only Mode 1 Manual Control Mode 2 Analog Input Mode 3 ModBus Network Mode 4 Not Used SYSTEM STATUS STATES 5 Locked Out power cycle required 6 IGV EXV Reset Mode 7 Ramping Up 8 Partial Vane Operation 9 Normal Operation 10 Maximum Capacity 11 Minimum IGV 12 Interlock Open 13 Fault Reset Mode 14 Above Drive Temp waiting to cool down 15 Compressor ...

Page 50: ...essor for at least 30 seconds This can be the result of a bad cable or a missing cable COMP BIN DISABLED This indicates the compressor enable signal binary input is no longer active This input is connected to the speciﬁc compressor circuit enable disable switch on the front panel access door TURBOCOR FAULT This alarm will occur if the Turbocor compressor communicates through ModBus that it has shu...

Page 51: ...LE Screens Press to scroll through ALARMS Screens Main Screen Map Module Screens Module Screens Refer to the following map when navigating through the RSMV Screens From the TBCOR MODULE Screen press ENTER to scroll through the screens ECON SH1 1809cXXX E BUS SOFTWARE 1809cXXX ADDRESS CURRENT SOFTWARE VERSION CURRENT BOARD ADDRESS Conﬁgure the address according to which circuit this module represen...

Page 52: ...romtheSYSTEMSTATUSScreen press ENTER to scroll through the screens SYSTEM STATUS STATUS ON OFF SUPRHEAT XX X F SUC TEMP XX X F STATUS CURRENT SUPERHEAT CALCULATION COILTEMP XX X F COIL TEMPERATURE READING FROM TEMPERATURE SENSOR INPUT SUCTION TEMPERATURE POSITION XXX ECONOMIZER POSITION SUC PRES XXX PSI SUCTION PRESSURE READING FROM INPUT SETPOINT XX X F SUCTION TEMPERATURE SETPOINT EXVA PID 1 0 0...

Page 53: ...lautomatically from the ALARMS screen when alarms are present NO ALARMS ACTIVE ALARMS NO ALARMS This will be shown if there are no current alarms ACTIVE ALARMS This will display if there are active alarms EBUS COMM TIMEOUT This alarm indicates that communication has been lost between the Module and the Turbocor compressor for at least 30 seconds This can be the result of a bad cable or a missing c...

Page 54: ...APPENDIX B BACnet Main Chiller Controller Technical Guide 54 BACnet Connection To MS TP Network Figure 34 BACnet Connection to MS TP Network ...

Page 55: ...frigerant Level Operating Setpoint Water Temperature Reset Voltage AI 10 Leaving Water Setpoint Reset Voltage Signal Compressor Demand Percent Signal AI 11 Demand Signal to all Active Compressors Liquid Line Temperature AI 12 Liquid Line Temperature Liquid Line Pressure AI 13 Liquid Line Pressure Liquid Line Saturation Temperature AI 14 Liquid Line Saturation Temperature Liquid Line Sub cooling AI...

Page 56: ...ature AI 31 Economizer 3 Saturation Temperature Economizer 3 Suction Line Temperature AI 32 Economizer 3 Suction Line Temperature Economizer 3 Superheat AI 33 Economizer 3 Superheat Comp 1 IGV Position AI 34 Compressor 1 Load Balance Valve Position Comp 1 Actual Speed in RPM AI 35 Compressor 1 Actual Speed in RPM Comp 1 Load Balance Valve AI 36 Compressor 1 Load Balance Valve Comp 1 Compressor RPM...

Page 57: ...p 2 Suction Line Temperature AI 55 Compressor 2 Suction Line Temperature Comp 2 Discharge Pressure AI 56 Compressor 2 Discharge Pressure Comp 2 Saturated Discharge Temp AI 57 Compressor 2 Saturated Discharge Temperature Comp 2 Discharge Line Temp AI 58 Compressor 2 Discharge Line Temperature Comp 2 Discharge Superheat AI 59 Compressor 2 Superheat Comp 2 Condenser Ratio AI 60 Compressor 2 Condenser...

Page 58: ...AI 77 Compressor 3 Faults See Fault Bits below Comp 3 Alarms AI 78 Compressor 3 Alarms See Alarm Bits below BACnet Parameters CompressorAlarmBits BIT STRING Inverter Temperature Alarm 0 Suction Pressure Alarm 2 Discharge Pressure Alarm 3 3 Phase Overcurrent Alarm 4 Cavity Temperature Alarm 5 Invalid Alarm 6 Pressure Ratio Alarm 7 SCR Temperature Alarm 10 CompressorFaultBits BIT STRING Inverter Tem...

Page 59: ... Requested to Run Isolation Valve 1 Status BI 10 Isolation Valve 1 Open Close Status Isolation Valve 2 Status BI 11 Isolation Valve 2 Open Close Status Isolation Valve 3 Status BI 12 Isolation Valve 3 Open Close Status Proof of Water Flow Fault BI 13 Water Flow Alarm Detected Expansion Boards Missing BI 14 One or more Expansion Boards is bad or missing Condenser Fault BI 15 Condenser Fan has set a...

Page 60: ...e the compressors will be locked out 0 40 Leaving Water Setpoint Stage Down AV 2 If the Leaving Water drops this much below the Water Setpoint the compressors will stage oﬀ 1 10 Maximum Leaving Water Reset Limit AV 3 The Leaving Water Setpoint resets between this maximum value and the minimum reset limit as the Reset Input Voltage Signal varies from min to max 1 110 Minimum Leaving Water Reset Lim...

Page 61: ...et temperature to adjust the Sensor s Temperature 100 100 Entering Water Sensor Calibration Oﬀset AV 13 If the Entering Water Sensor is reading incorrectly you can use this option to enter an oﬀset temperature to adjust the Sensor s Temperature 100 100 Outdoor Air Sensor Calibration Oﬀset AV 14 If the Outdoor Air Sensor is reading incorrectly you can use this option to enter an oﬀset temperature t...

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