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MicroTech Air Cooled Screw Chiller Open Protocol

1. 61 SUPPORT MENU READ WRITE SCREENS esse sese sese sese sese sese sese o sese sees esses esee 61 DISABLING THE SIMULATOR CONTROL CODE e e e nne enn nnn nnn nnns nnns usn n isis as s n n s sns n stesse tss sese sese nnn 62 FURTHER INFORMATION ON WINDOWS MONITOR SOFTWARE ccccccccccccccsececesecesecesesesesesesesesesesesescseeeessescseseesseseesesesesseeees 63 GLOSSARY NOLUISSE 64 MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 4 McQuay International Proprietary Information Revision History Version 2 3 Version 2 2 Version 2 1 Version 2 0 Version 1 2 Made changes for the version 30 code Remove single compressor because there isn t any version 30 code for single compressor screw chillers Corrected Alarm memory locations all codes Updated valid software idents Changed title from MicroTech StarGate Screw Chiller to MicroTech Air Cooled Screw Chiller Removed all references to StarGate Corrected Clear Circuit 3 Alarm memory location Updated valid software idents Added single compressor screw chiller Added 4 compressor screw chiller Removed RLA read only point for all 4 chillers T O configurations and memory locations MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 McQuay International Proprietary Information have been added for 4 Compressor Chillers Memory l
2. Circuit 3 Superheat Temperature 04E5 04E6 This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Compressor 1 Operating Hours 0862 0863 Cumulative total of operating hours for compressor 1 Compressor 1 Starts 086A 086B Running total of starts for compressor 1 Compressor 2 Operating Hours 0864 0865 Cumulative total of operating hours for compressor 2 Compressor 2 Starts 086C 086D Running total of starts for compressor 2 Compressor 3 Operating Hours 0866 0867 Cumulative total of operating hours for compressor 3 Compressor 3 Starts 086E 086F Running total of starts for compressor 3 MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 34 McQuay International Proprietary Information Evaporator Entering Water Temperature 046E 046F This location contains the temperature in F of the chilled water entering the evaporator Evaporator Leaving Water Temperature 046 1 0462 This location contains the temperature in F of the chilled water leaving the evaporator Outdoor Air Temperature 0470 0471 This location contains the ambient temperature in F of the outdoor air Applies to air cooled units only Stage of Cooling 042B Stage of cooling capacity at which the chiller is currently operating Unit Status 0427 Defined val
3. 1E0A Condenser pressure in circuit 3 at time of alarm occurrence Circuit 3 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1E0F 1E0A Evaporator leaving water temperature at time of circuit 3 alarm occurrence Circuit 3 Conditions at Time of Alarm Evaporator Pressure 1E07 1E08 Evaporator pressure in circuit 3 at time of alarm occurrence MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 46 McQuay International Proprietary Information Circuit 3 Conditions at Time of Alarm Fan Stage 1E14 Fan stage in operation at time of circuit 3 alarm occurrence Maximum fan stages per model ALS300 340 4 ALS360 425 5 Circuit 3 Conditions at Time of Alarm Outdoor Air Temperature 1E11 1E12 Outdoor air temperature at time of circuit 3 alarm occurrence Circuit 3 Conditions at Time of Alarm Suction Temperature 1E0B 1E0C Measured temperature in circuit 3 suction line at time of alarm occurrence Circuit 3 Current Alarm 08BE Same as Circuit 1 Above Circuit 23 Current Alarm Hour Year 1E01 1E06 These locations contain the time hour and minute and date day month and year that the alarm occurred Circuit 43 Evaporator Pressure 047F 0480 Measured pressure in evaporator in circuit 3 Circuit 3 Discharge Temperature 0485 0486 This location contains the temperature in F of the compressor discharge refrigerant Circuit 3 Status 042A Same as Circuit
4. F Circuit 1 Suction 0475 6 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 1 Superheat 04D7 8 0 2360 X 10 F Temperature 0 to 263 F Circuit 2 Condenser 0469 A 0 4500 X 10 PSI Pressure 0 450 PST Circuit 2 Conditions at 1D13 0 100 Percent Time of Alarm Capacity Circuit 2 Conditions at 1D09 A 0 4500 X 10 PSI Time of Alarm 0 450 PSI Condenser Pressure Circuit 2 Conditions at STDOF 10 600 3630 X 10 100 F Time of Alarm 40 to 263 F Evaporator Leaving Water Temperature Circuit 2 Conditions at 1D07 8 0 1500 10 PSI Time of Alarm 0 150 PSI Evaporator Pressure Circuit 2 Conditions at 1014 0 5 Time of Alarm Fan Stage Circuit 2 Conditions at 1D0D E 600 3630 X 10 100 F Time of Alarm Liquid 40 to 263 F Line Temperature Circuit 2 Conditions at SD011 2 600 3630 X 10 100 F Time of Alarm Outdoor 40 to 263 F Air Temp Circuit 2 Conditions at STDOB C 600 3630 X 10 100 F Time of Alarm Suction 40 to 263 F Temperature Circuit 2 Current Alarm 08BA 0 35 See alarm list below MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 McQuay International Proprietary Information Circuit 2 Current Alarm Hour Minute Month Date Year Circuit 2 Discharge 0489 A 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 2 Evaporator 0465 6 0 1500 X 10 PSI Pressure 0 150 PSI Circuit 2 Liquid Line 047B C 600 3630 X 10 100 F Temperat
5. Save ptions All Standard Data Setpoints Control Variables Tables Port Passwords Cancel The controller address should be 00 ff in the case of a single unit connection 00 ff is a special address that tells the software to connect to the direct connected controller regardless of the controller s address setting Alternately you may enter the address of the controller however when trying to connect in this manner the address must match The Save Data Download Program Restore Data option should be chosen for every download The program file will be the simulator code you wish to download to the controller The data file is a temporary file in which will be stored controller data during the download process This file may be deleted off of your hard drive after successful download You must specify a data file name but the name of the file is arbitrary The save options you should have checked are Port Configuration and Passwords You should see the download progress dialog box after initiating the download Download Save Restore Status Ea Model 2XX Download Code Size bytes 48612 5568 11 Bety Skip Umit MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 60 McQuay International Proprietary Information Monitoring a simulator controller Once the code is properly downloaded into the simulator controller you may begin to monitor memory locations in the Windows Simula
6. X 10 100 F Temperature 40 to 263 F Circuit 3 Evaporator 047F 80 0 1500 X 10 PSI Pressure 0 150 PSD Circuit 3 Liquid Line 0485 6 600 3630 X 10 100 oF Temperature 40 to 263 F Circuit 3 Status 042A 0 13 See circuit status list below Circuit 3 Discharge 04E9 A 0 2360 X 10 F Superheat Temperature 0 to 263 F Circuit 3 Suction 0483 4 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 3 Superheat 04E5 6 0 2360 X 10 F Temperature 0 to 263 F Compressor 1 Operating 0862 3 0 65279 Hours Hours Compressor 1 Starts 086A B 0 65279 Do Sms Compressor 2 Operating 0864 5 0 65279 Hours Hours Compressor 2 Starts 086C D 0 65279 Sas Compressor 3 Operating 0866 7 0 65279 Hours Hours Compressor 3 Starts 086E F 0 65279 P Starts Evaporator Entering 046E F 600 3630 X 10 100 F Water Temperature 40 to 263 F Evaporator Leaving 046 1 2 600 3630 X 10 100 F Water Temperature 40 to 263 F Outdoor Air Temperature 0470 1 600 3630 X 10 100 F 40 to 263 F Unit Status 0427 0 14 See unit status list below Active Chilled Water Temperature Setpoint 045A The setpoint used by the chiller to control the leaving water temperature This is the combination of setpoint and reset values MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 28 McQuay International Proprietary Information Circuit 1 Condenser Pressure 046
7. of the low pressure vaporized refrigerant entering the compressor MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 32 McQuay International Proprietary Information Circuit 2 Superheat Temperature 04D9 04DA This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Circuit 3 Condenser Pressure 0481 0482 Measured pressure in condenser in circuit 3 Circuit 3 Conditions at Time of Alarm Capacity 1E13 Capacity at which circuit 3 was running at time of alarm occurrence Circuit 3 Conditions at Time of Alarm Condenser Pressure 1E09 1E0A Condenser pressure in circuit 3 at time of alarm occurrence Circuit 3 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1E0F 1E10 Evaporator leaving water temperature at time of circuit 3 alarm occurrence Circuit 3 Conditions at Time of Alarm Evaporator Pressure 1E07 1E08 Evaporator pressure in circuit 3 at time of alarm occurrence Circuit 3 Conditions at Time of Alarm Fan Stage 1E14 Fan stage in operation at time of circuit 3 alarm occurrence Maximum fan stages per model ALS205 220 4 ALS235 280 5 Circuit 3 Conditions at Time of Alarm Liquid Line Temperature 1E0D 1E0E Measured temperature in circuit 3 liquid line at time of alarm occurrence Circuit 3 Conditions at Time of Alarm Outdoor Ai
8. 41 above Circuit 3 Discharge Superheat Temperature 04E9 04EA This location contains the Discharge Superheat Temperature in F The Discharge Superheat Temperature is calculated by subtracting the condenser refrigerant Temperature from the discharge temperature Circuit 3 Suction Temperature 0483 0484 This location contains the temperature in F of the low pressure vaporized refrigerant entering the compressor Circuit 3 Superheat Temperature 04E5 04E6 This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Circuit 4 Condenser Pressure 0489 048A Measured pressure in condenser in circuit 4 MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 47 McQuay International Proprietary Information Circuit 4 Conditions at Time of Alarm Capacity 1F13 Capacity at which circuit 4 was running at time of alarm occurrence Circuit 4 Conditions at Time of Alarm Condenser Pressure 1F09 1F0A Condenser pressure in circuit 4 at time of alarm occurrence Circuit 44 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1F0F 1F10 Evaporator leaving water temperature at time of circuit 4 alarm occurrence Circuit 4 Conditions at Time of Alarm Evaporator Pressure 1F07 1F08 Evaporator pressure in circuit 4 at time of alarm occurrence Circuit 44 Conditions at
9. Alarm 1D11 2 600 3630 X 10 100 F Outdoor Air Temperature 40 to 263 F Circuit 2 Conditions at Time of Alarm 1DOB C 600 3630 X 10 100 F Suction Temperature 40 to 263 F Circuit 2 Current Alarm 08BA See alarm list below Circuit 2 Current Alarm Hour Minute Month Date Year Circuit 2 Evaporator Pressure 0465 6 0 1500 X 10 PSI 0 150 PSI Circuit 2 Discharge Temperature 047B C 600 3630 X 10 100 F 40 to 263 F Circuit 2 Status 0429 0 13 See circuit status list below Circuit 2 Discharge Superheat 04E1 2 0 2360 X 10 F Temperature 0 to 263 F Circuit 2 Suction Temperature 0477 8 600 3630 X 10 100 F 40 to 263 F Circuit 2 Superheat Temperature 04D9 A 0 2360 X 10 F 0 to 263 F Circuit 3 Condenser Pressure 048 1 2 0 4500 X 10 PSI 0 450 PSI Circuit 3 Conditions at Time of Alarm 1E13 0 100 Percent Capacity Circuit 3 Conditions at Time of Alarm 1E09 A 0 4500 X 10 PSI Condenser Pressure 0 450 PSD MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 40 McQuay International Proprietary Information Circuit 3 Conditions at Time of Alarm YEOF 10 600 3630 X 10 100 Evaporator Leaving Water Temperature 40 to 263 F Circuit 3 Conditions at Time of Alarm 1E07 8 0 1500 X 10 Evaporator Pressure 0 450 PSI Circuit 3 Conditions at Time of Alarm 1E14 0 Fan Stage Circuit 3 Conditions at Time of Alarm 1E11 2 600 3630 X
10. Down 8 Pump Down 9 Start Requested 10 Pre purge 11 Open Solenoid 12 Low Ambient Start 13 Cooling Circuit 1 Suction Temperature 0475 0476 This location contains the temperature in F of the low pressure vaporized refrigerant entering the compressor Circuit 1 Superheat Temperature 04D7 04D8 This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Circuit 2 Condenser Pressure 0469 046A Measured pressure in condenser in circuit 2 MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 18 McQuay International Proprietary Information Circuit 2 Conditions at Time of Alarm Capacity 2013 Capacity at which circuit 2 was running at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Condenser Pressure 2009 200A Condenser pressure in circuit 2 at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Evaporator Leaving Water Temperature 200F 2010 Evaporator leaving water temperature at time of circuit 2 alarm occurrence Circuit 2 Conditions at Time of Alarm Evaporator Pressure 2007 2008 Evaporator pressure in circuit 2 at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Fan Stage 2014 Fan stage in operation at time of circuit 2 alarm occurrence Maximum fan stages per model ALS 125 140 4 ALS155 170
11. EERIE ETERS 8 DOING ETE A E A 8 Remote Alarm Clearing sisisi aienak ORE RE SR ER EN e 9 NETWORK CONBIGURATION siete bee el eee abo eet c ee TAS oe Ehe tete Ree 9 Communications to a Single Chiller ssis x et e ee epi tete ie i ive endete lease owe iu 9 Communications to Two or More Chillers ccccccccccccccsssecccccccccccsssseseeccccccussseceececescessuusescceccessuscsecceseseausaeseesceseeuuaneseeceseues 10 SUPPLEMENTAL LITERA TURE 5 5 ceo era ro ao oen obe ee 12 CONVERSIONS AND CONVENTIONS e ee eae eren ooa baee eret tn saab PP alae aba ae tU po abe e pool eR boo et iE S inae tea Free pado 12 CONVERTING 2 BYTE VARIABEBS ceo tete eios eco te Bie tt ce tee ee ire tee E rece teorico doceo te re eie 12 NOTEON TE MPBEXT RES eben aec aei Be dme Dur M e 13 13 OPEN PROTOCOL MASTER PANEL ccssssssssssssccssssccccsssscccssscccssssscccesscaccecsssaccessacccessscccecsssescessacsccssnees 13 READ ONLY MEMORY LOCATIONS 1 COMPRESSOR CHILLERS ERROR BOOKMARK NOT DEFINED READ WR
12. McQuay International Proprietary Information Unit Controller Model 250 280 A KEYPAD LCD DISPLAY DIGITAL OUTPUTS Y Communications to Two or More Chillers The OPM provides a single communications port entry into the McQuay MicroTech Network The OPM panel consists of a McQuay model 120 controller The automation integrator connects to Comm Port A which is switch selectable to RS 232 or RS 485 communications 9600 baud Port A is the automation control integrator s Open Protocol communications port Comm Port B is a daisy chained multi drop 9600 baud RS 485 proprietary McQuay protocol The main function of the OPM is to provide the network communications interface for up to 64 MicroTech controllers The screw chiller controller is factory mounted The unit controller provides pre programmed pre engineered and pre tested stand alone control There is one controller for each screw chiller Once the McQuay communication network has been commissioned by a McQuay representative the BAS vendor can connect their Open Protocol device to the OPM The screw chillers will continue to operate when communications are lost However the network must be intact for read and write requests from the BAS vendor s communication device to be passed along to the screw chillers When the BAS communicating device is connected to the OPM panel the communications configuration is as follows M
13. entering the compressor Circuit 4 Superheat Temperature 04E7 04E8 This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Compressor 1 Operating Hours 0862 0863 Cumulative total of operating hours for compressor 1 Compressor 1 Starts 086A 086B Running total of starts for compressor 1 Compressor Z2 Operating Hours 0864 0865 Cumulative total of operating hours for compressor 2 Compressor 2 Starts 086C 086D Running total of starts for compressor 2 Compressor 3 Operating Hours 0866 0867 Cumulative total of operating hours for compressor 3 Compressor 3 Starts 086E 086F Running total of starts for compressor 3 Compressor Z4 Operating Hours 0868 0869 Cumulative total of operation hours for compressor 4 Compressor 4 Starts 0870 0871 Running total of starts for compressor 4 Evaporator Entering Water Temperature 046E 046F This location contains the temperature in F of the chilled water entering the evaporator Evaporator Leaving Water Temperature 0461 0462 This location contains the temperature in F of the chilled water leaving the evaporator MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 49 McQuay International Proprietary Information Outdoor Air Temperature 0470 0471 This location contains the ambient temp
14. features are in the enabled position writing a 1 to the Network Command memory location will disable the chiller If any of the enable disable features is in the disabled position the Network Command will have no effect The memory for Network Command is a RAM location that upon loss and subsequent restoration of power is initialized to Enable MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 22 McQuay International Proprietary Information Network Demand Limit 044D The chiller can be Demand Limited two ways either by a hardwired 4 20 mA signal or by network communications Here is the formula C C 1 905 N 501 100 Where C Number of cooling stages S 4 20 mA range in percent N Network range in percent Example 1 If there are eight cooling stages and 50 has been written to the Network Demand Limit No external 4 20 mA signal is wired 8 8 1 0 50 50 100 8 7 50 50 100 4 stages Maximum Limit Example 2 If there are eight cooling stages the input from the 4 20 signal is 8 mA and the Network Demand Limit is zero 8 8 1 25 0 50 100 8 7 25 50 100 2 6 stages Maximum Limit Network Evaporator Leaving Water Temperature Reset 044E This location contains the percentage of chilled water temperature reset to be performed when Network Chilled Water Reset is selected as the Reset Option Setpoint below Reset Option
15. some reason your simulator has a different password you may enter a new password here to try and establish communications to the controller Note that this password does not change the controller password it merely tries to match one of the four level passwords that exist in the controller The connection type needs to be DIRECT however the BAUD RATE does not need to match the baud rate that the controller port is set up for When direct connecting to a controller the monitor software will test all possible connection speeds from 300 to 9600 Baud until a connection is made or all baud rates have been attempted Once you have adjusted the above parameters you may attempt to connect to the controller once again by pressing the Init Comm button Downloading Simulation code Once you have connected to the controller you may need to download simulator application code From the Main Menu bar select the Support option Under the menu items for support you will find Download Select Download and you should see the following screen MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 59 McQuay International Proprietary Information Controller Address or 4 may be multiple C Download Program to Controller Save Data Download Program Restore Data C Save Controller Data to File C Restore Controller Data from File C Upload from Controller Saves Everything Program File C MCQUAY CXG 3E04D COD Data File CAMCQUAYATEMP
16. 0 to 263 F Circuit 1 Conditions at Time of Alarm 1COB C 600 3630 X 10 100 Suction Temperature 40 to 263 F Circuit 1 Current Alarm 08B9 0 35 See alarm list below Circuit 1 Current Alarm Hour Minute Month Date Year Circuit 1 Evaporator Pressure 0463 4 0 1500 X 10 PSI 0 150 PSI Circuit 1 Discharge Temperature 0479 A 600 3630 X 10 100 F 40 to 263 F Circuit 1 Status 0428 0 13 See circuit status list below Circuit 1 Discharge Superheat 04DF E0 0 2360 X 10 F Temperature 0 to 263 F MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 39 McQuay International Proprietary Information Variable Name Conversion Circuit 1 Suction Temperature 0475 6 600 3630 X 10 100 F 40 to 263 F Circuit 1 Superheat Temperature 04D7 8 0 2360 X 10 0 to 263 F Circuit 2 Condenser Pressure 0469 A 0 4500 X 10 PSI 0 450 PST Units F Percent Circuit 2 Conditions at Time of Alarm 1D13 0 100 Capacity Circuit 2 Conditions at Time of Alarm 1D09 A 0 4500 PSI Condenser Pressure 0 450 PSI Circuit 2 Conditions at Time of Alarm YDOF 10 600 3630 X 10 100 F Evaporator Leaving Water Temperature 40 to 263 F Circuit 2 Conditions at Time of Alarm 1D07 8 _ 0 1500 PSI Evaporator Pressure 0 150 PSI Circuit 2 Conditions at Time of Alarm 51014 0 5 Fan Stage Circuit 2 Conditions at Time of
17. 10 100 Outdoor Air Temperature 40 to 263 F Circuit 3 Conditions at Time of Alarm 1 600 3630 X 10 100 Suction Temperature 40 to 263 F Circuit 3 Current Alarm 08BE 1 35 129 163 See alarm list below Circuit 3 Current Alarm Hour 0 23 Minute 0 59 1 12 1 31 0 99 Circuit 3 Evaporator Pressure 047F 80 0 1500 X 10 PSI 0 150 PSI Circuit 3 Discharge Temperature 0485 6 600 3630 X 10 100 F 40 to 263 F Circuit 3 Status 042A 0 13 See circuit status list below Circuit 3 Discharge Superheat 04E9 A 0 2360 X 10 F Temperature 0 to 263 F Circuit 3 Suction Temperature 0483 4 600 3630 X 10 100 F 40 to 263 F Circuit 3 Superheat Temperature 04E5 6 0 2360 X 10 F 0 to 263 F Circuit 4 Condenser Pressure 0489 A 0 4500 X 10 PSI 0 450 PSI Circuit 4 Conditions at Time of Alarm 1F13 0 100 Percent Capacity Circuit 4 Conditions at Time of Alarm 1F09 A 0 4500 X 10 PSI Condenser Pressure 0 450 PSI Circuit 4 Conditions at Time of Alarm 1FOF 10 600 3630 X 10 100 F Evaporator Leaving Water Temperature 40 to 263 F Circuit 4 Conditions at Time of Alarm 1F07 8 0 1500 X 10 PSI Evaporator Pressure 0 150 PSI F PSI F SE Circuit 4 Conditions at Time of Alarm 1 14 0 Fan Stage Circuit 4 Conditions at Time of Alarm 1F11 2 600 3630 X 10 100 Outdoor Air Temperature 40 to 263 F MicroTech Air Cooled S
18. 32 Communications Cable package 1 RS 485 Communication Cable package 2 Microsoft Windows based McQuay Open Protocol Monitor and Simulator software for the screw chiller available on McQuay Online If you do not have access to McQuay Online please contact McQuay s Controls and Network Systems Marketing Group for software and access Setup of Hardware for Testing One setup that is particularly helpful for proving out an Open Protocol interface is to direct connect both the BAS interface and the simulator monitor software simultaneously as shown below In this arrangement the Open Protocol interface to the TCC Comm device is operational on the controller s Port B and the McQuay Monitor program is operational on a PC connected to the controller s Port A The HEX switches on the Model 250 Controller will be Hi F and Lo F In this configuration both ports are TTY PC accessible and Port A is always 1200 baud and Port B is 9600 Baud Remember to always turn power off and on after resetting addresses MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 55 McQuay International Proprietary Information TCC Comm Device Monitor Software MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 56 McQuay International Proprietary Information Simulator Monitor Software Guide Overview A simulator Windows based monitor software is available for most of McQuay s products offering Open Protocol The s
19. 5 ALS 175 204 6 Circuit 2 Conditions at Time of Alarm Outdoor Air Temp 2011 2012 Outdoor air temperature at time of circuit 2 alarm occurrence Circuit 2 Conditions at Time of Alarm Suction Temperature 200B 200C Measured temperature in circuit 1 suction line at time of alarm occurrence Circuit 2 Current Alarm 08BA Same as Circuit 1 Above Circuit 2 Current Alarm Hour Year 2001 2006 These locations contain the time hour and minute and date day month and year that the alarm occurred Circuit 42 Evaporator Pressure 0465 0466 Measured pressure in evaporator in circuit 2 Circuit 2 Discharge Temperature 047B 047C This location contains the temperature in F of the compressor discharge refrigerant Circuit 2 Status 0429 Same as Circuit 1 Above Circuit 2 Suction Temperature 0477 0478 This location contains the temperature in F of the low pressure vaporized refrigerant entering the compressor MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 19 McQuay International Proprietary Information Circuit 2 Superheat Temperature 04D9 04DA This location contains the Condenser Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Compressor 1 Operating Hours 0862 0863 Cumulative total of operating hours for compressor 1 Compressor 1 Starts 086A 086B Ru
20. 7 0468 Measured pressure in condenser in circuit 1 Circuit 1 Conditions at Time of Alarm Capacity 1013 Capacity at which circuit 1 was running at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Condenser Pressure 1C09 1C0A Condenser pressure in circuit 1 at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1COF 1C10 Evaporator leaving water temperature at time of circuit 1 alarm occurrence Circuit 1 Conditions at Time of Alarm Evaporator Pressure 1C07 1C08 Evaporator pressure in circuit 1 at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Fan Stage 1C14 Fan stage in operation at time of circuit 1 alarm occurrence Maximum fan stages per model ALS205 220 4 ALS235 280 5 Circuit 1 Conditions at Time of Alarm Liquid Line Temperature 1COD 1COE Measured temperature in circuit 1 liquid line at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Outdoor Air Temp 1C11 1C12 Outdoor air temperature at time of circuit 1 alarm occurrence Circuit 1 Conditions at Time of Alarm Suction Temperature 1COB 1COC Measured temperature in circuit 1 suction line at time of alarm occurrence Circuit 1 Current Alarm 08B9 High Condenser Pre Alarm Stage Down Freeze Refrigerant Pre Alarm Stage Down Loss Of Chilled Water Flow No Pump Down Pre purge Fail MicroTech Air Cooled Screw Chiller O
21. 7 8 0 4500 X 10 PSI Pressure 0 450 PSI Circuit 1 Conditions at 1F 13 0 100 Time of Alarm Capacity Circuit 1 Conditions at 1F09 A 0 4500 X 10 PSI Time of Alarm 0 450 PSI Condenser Pressure Circuit 1 Conditions at 1FOF 10 600 3630 X 10 100 Time of Alarm 40 to 263 F Evaporator Leaving Water Temperature Percent Circuit 1 Conditions at 1F07 8 0 1500 X 10 PSI Time of Alarm 0 150 PSD Evaporator Pressure Circuit 1 Conditions at 1 14 Time of Alarm Fan Stage Circuit 1 Conditions at 1F 11 2 600 3630 X 10 100 F Time of Alarm Outdoor 40 to 263 F Air Temp Circuit 1 Conditions at 1FOB C 600 3630 X 10 100 F Time of Alarm Suction 40 to 263 F Temperature See alarm list below Circuit 1 Current Alarm 08B9 MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 14 McQuay International Proprietary Information Variable Name Address Range Conversion Units Description Circuit 1 Current Alarm Hour Minute Month E Date Year Circuit 1 Evaporator 0463 4 0 1500 X 10 Pressure 0 150 PST Circuit 1 Discharge 0479 A 600 3630 X 10 100 Temperature 40 to 263 F Circuit 1 Status 0428 13 See circuit status list below Circuit 1 Suction 0475 6 600 3630 X 10 100 Temperature 40 to 263 F Circuit 1 Superheat 04D7 8 0 2360 10 Temperature 0 to 263 F Circuit 2 Condenser 0469 A 0 4500 X 10 Pressure 0 450 PSI
22. 905 Chiller 44 0 F Address Memory Address Display C Hexadecimal Controller Address Status Idle Choose the OK button to start Cancel Stop Write I ec The above memory location for Chilled Water Temperature displays 44 degrees F In the read write screen you can see the decimal value of memory location 0905 which is 88 The conversion in this case is value 2 to get degrees F Disabling the Simulator Control Code The simulator control code is a compiled version of the real control code with all of the sensors disabled You may find that you want to test a memory location but the simulator code doesn t allow the change or it simply rewrites the previous value to that memory location The following technique may be used to disable all of the tasks in the simulator code so that you may alter any memory location and the value will not be altered by the control code Below is a read write screen with memory locations 0300 032F shown Note that the monitor function is chosen When you monitor this screen the values will change rapidly If FF or 255 decimal is written to each of these memory locations the task timer will stop If you want the task timers to start again write a 1 to each memory location If you select the 0300 to change there is an option to change a single location or global change so you do not have to change each one individually You may get an err
23. Circuit 2 Conditions at 2013 0 100 Percent Time of Alarm Capacity Circuit 2 Conditions at 2009 A 0 4500 X 10 Time of Alarm 0 450 PSI Condenser Pressure Circuit 2 Conditions at 200F 10 600 3630 X 10 100 Time of Alarm 40 to 263 F Evaporator Leaving Water Temperature Circuit 2 Conditions at 2014 Time of Alarm Fan Stage Circuit 2 Conditions at 2011 2 600 3630 X 10 100 Time of Alarm Outdoor 40 to 263 F Air Temp Circuit 2 Conditions at 200B C 600 3630 X 10 100 Time of Alarm Suction 40 to 263 F Temperature Circuit 2 Current Alarm 08BA Circuit 2 Current Alarm Hour Minute Month Date Year Circuit 2 Conditions at 2007 8 0 1500 10 Time of Alarm 0 150 PSI Evaporator Pressure See alarm list below MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 15 McQuay International Proprietary Information Variable Name Address Range Conversion Units Description Circuit 2 Evaporator 0465 6 0 1500 10 PSI Pressure 0 150 PSI Circuit 2 Discharge 047B C 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 2 Status 0429 0 13 See circuit status list below Circuit 2 Suction 0477 8 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 2 Superheat 04D9 A 0 2360 X 10 F Temperature 0 to 263 F Compressor 1 Operating 50862 3 0 65279 Hours Hours Compressor 2 Operating 0864 5 0 65279 Hours Hours Evaporator Enter
24. ITE MEMORY LOCATIONS 1 COMPRESSOR CHILLERS ERROR BOOKMARK NOT DEFINED READ ONLY MEMORY LOCATIONS 2 COMPRESSOR CHILLERS creen 14 READ WRITE MEMORY LOCATIONS 2 COMPRESSOR CHILLERS 21 READ ONLY MEMORY LOCATIONS 3 COMPRESSOR CHILLERS crees 25 READ WRITE MEMORY LOCATIONS 3 COMPRESSOR CHILLERS 36 READ ONLY MEMORY LOCATIONS 4 COMPRESSOR CHILLERS scsssssssssssssssessssessesessesessesssserseserseees 39 READ WRITE MEMORY LOCATIONS 4 COMPRESSOR CHILLERS 51 REQUIRED DEVELOPMENT TESTING TOOLS eere esee snas tatnen ta 55 MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 3 McQuay International Proprietary Information SETUP OF HARDWARE BOR TESTING 243 53e tete oett e ete eet deret 55 SIMULATOR MONITOR SOFTWARE GUIDE scccssssscssssscccsssccssssscccssssccccssscccessscccesssecsessseccessecesessseececsssssecsses 57 OVER VIEW 57 LOGGING ONTO THE SOFTWARE cette eaten ete ues leececesesesvews ce tege eve ves ee teg ete vete eb 57 COMMUNICATIONS I NITIAEIZATION eu DNI d e e ME DECR 58 DOWNLOADING SIMULATION 59 MONITORING A SIMULATOR
25. MicroTech Air Cooled Screw Chiller Open Protocol Data Communications Information Packet Version 2 3 April 2003 CONFIDENTIAL This Document may not be copied or reproduced in any way without the express written consent of McQuay International NOTICE Copyright 1999 McQuay International Minneapolis MN All rights reserved throughout the world McQuay International reserves the right to change any information contained herein without prior notice No guarantees are given as to the accuracy of information provided McQuay International Proprietary Information Contents REVISION HISTORY ostsee See SiS 5 VERSION 2 2 E E EA E E 5 VERSION tes LY EA AE E SE ETE AEAEE EA E eel 5 VIER SION DERAT eter teste EE eim et EE RE O EEEE ON des EEE E b CO Let 5 AAE ONE A 5 VERSION LI ner EG NH ERN Mau 6 VERSION BU ETE 6 OVERVIEW vet ee ERE Ve dede vetu tudo 7 COMPATIBLE UNIT CONTROL SOFTWARE FOR OPEN PROTOCOL esee 7 TYPICAL OPEN PROTOCOL CONTROL FUNCTIONS cccccssccsccsseessssscssccccsessssscssecccsessssscssesscessessscssssscecsesssessssseessesssessseseseeenees 8 Remote Start Stop of Chillers itt ettet e et ped UR eee Ee bb 8 Chilled Water Resetu a iere tien aE
26. Setpoint 090B Possible values 0 No Chilled Water Reset default 1 Return Chilled Water Reset see I amp M 2 4 20 mA Chilled Water Reset 3 Network Chilled Water Reset 4 Ice Chilled Water Reset see I amp M 5 Outdoor Air Temperature Chilled Water Reset To reset from a hardwired 4 20 mA signal write 2 to 090B The chilled water supply temperature will then be controlled from a range of 44 F Evaporator Leaving Water Setpoint to 54 F Maximum Chilled Water Temperature Reset Setpoint 10 F plus the Evaporator Leaving Water Temperature Setpoint 44 F At4 mA or below the temperature setpoint will be 44 F At 20 mA the temperature setpoint will be 54 F MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 23 McQuay International Proprietary Information To reset through communication write 3 to 090B The chilled water supply temperature will then be controlled from a range of 44 F Evaporator Leaving Water Setpoint to 54 F Maximum Chilled Water Temperature Reset 10 F Evaporator Leaving Water Temperature Setpoint 44 F You may write 0 through 100 reset to the Network Evaporator Leaving Reset If you write a 0 the temperature setpoint will be 44 F If you write a 100 the temperature setpoint will be 54 F MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 24 McQuay International Proprietary Information Read Only Memory Locations 3 Compressor Chillers V
27. Time of Alarm Fan Stage 1F14 Fan stage in operation at time of circuit 4 alarm occurrence Maximum fan stages per model ALS300 340 4 ALS360 425 5 Circuit 4 Conditions at Time of Alarm Outdoor Air Temperature 1F11 1F12 Outdoor air temperature at time of circuit 4 alarm occurrence Circuit 4 Conditions at Time of Alarm Suction Temperature 1F0B 1F0C Measured temperature in circuit 4 suction line at time of alarm occurrence Circuit Z4 Current Alarm 08B7 Same as Circuit 1 above Circuit 4 Current Alarm Hour Year 1F01 1F06 These locations contain the time hour and minute and date day month and year that the alarm occurred Circuit 4 Evaporator Pressure 0487 0488 Measured pressure in evaporator in circuit 3 Circuit 4 Discharge Temperature 049D 049E This location contains the temperature in F of the compressor discharge refrigerant Circuit 4 Status 0430 Same as Circuit 1 above MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 48 McQuay International Proprietary Information Circuit 4 Discharge Superheat Temperature 04EB 04EC This location contains the Discharge Superheat Temperature in F The Discharge Superheat Temperature is calculated by subtracting the condenser refrigerant Temperature from the discharge temperature Circuit 4 Suction Temperature 049B 049C This location contains the temperature in F of the low pressure vaporized refrigerant
28. ariable Name Active Chilled Water 045A 30 160 Xn F Temperature Setpoint 15 80 F Circuit 1 Condenser 0467 8 0 4500 X 10 PSI Pressure 0 450 PSI Circuit 1 Conditions at 1C13 0 100 Percent Time of Alarm Capacity Circuit 1 Conditions at 1C09 A 0 4500 X 10 Time of Alarm 0 450 PSI Condenser Pressure Circuit 1 Conditions at 1COF 10 600 3630 X 10 100 Time of Alarm 40 to 263 F Evaporator Leaving Water Temperature Circuit 1 Conditions at 1C07 8 0 1500 Time of Alarm 0 150 PSI Evaporator Pressure Circuit 1 Conditions at 1 14 0 5 Time of Alarm Fan Stage Circuit 1 Conditions at 1 11 2 600 5630 X 10 100 Time of Alarm Outdoor 40 to 263 F Air Temp Circuit 1 Conditions at 1 600 3630 X 10 100 Time of Alarm Suction 40 to 263 F Temperature Circuit 1 Current Alarm 08B9 0 35 See alarm list below Circuit 1 Current Alarm Hour Minute Month Date Year MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 McQuay International Proprietary Information Variable Name Address Circuit 1 Discharge 0487 8 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 1 Evaporator 0463 4 0 1500 X 10 PSI Pressure 0 150 PSD Circuit 1 Liquid Line 0479 A 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 1 Status 0428 0 13 status list below Circuit 1 Discharge 04DF E0 0 2360 X 10 F Superheat Temperature 0 to 263
29. aring The automation system can clear an active alarm in the MicroTech chiller through communications Care should be exercised so that alarms are cleared only by authorized individuals and only when the cause of the alarm has been corrected and or repaired Network Configuration MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 This section explains how the McQuay International screw Chiller Open Protocol Network works so that you can choose the correct equipment and program your system to communicate through McQuay International s MicroTech Open Protocol There are two scenarios for connecting to the controllers that are used to make an Open Protocol Screw Chiller Network They are as follows e Communications to a single chiller e Communications to two or more chillers Communications to a Single Chiller All McQuay MicroTech screw chillers are shipped from the factory with one communications port factory configured for RS 232 9600 baud The port is located on the unit controller and is designated Port A The port may also be accessed via RS 485 by replacing the factory installed RS 232 plug with an RS 485 plug The RS 485 plug may be constructed according to the Open Protocol Wiring Diagram booklet or may be purchased through McQuay International The following diagram shows the chiller to network connections on Port B communications between the chiller and Building Automation System BAS established on Port A
30. ay air cooled screw chiller BAS Building Automation System KPA Kilopascals OAT Outdoor Air Temperature OPM Open Protocol Master PFS McQuay screw chiller water cooled model NOT covered in this document please look on McQuay Online for document covering water cooled screw chillers PSI Pounds Per Square Inch MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 64
31. byte For example 04DB C 04DB is the high byte and 04DC is the low byte Two byte variables use the following conversion unless otherwise specified MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 12 McQuay International Proprietary Information Value HiByte 255 LoByte HiByte and LoByte are the decimal equivalents of the hex byte The Value may need to be further processed by the given conversion to get the final result in the units specified Note on Temperatures All temperatures given above are in degrees Fahrenheit to get degrees Celsius you must use the standard formula for temperature conversion C 5 9 CF 32 Note on Pressures All pressures given above are in PSI to get KPA you must use the following standard conversion KPA 6 89 PSI OPM Open Protocol Master Panel There is only one memory location that can be read in the Open Protocol Master Panel It is used to verify that the OPM is powered and communicating and that the applications code is intact Open Protocol Master Status 0400 0 254 Program is running 255 Program is not running MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 13 McQuay International Proprietary Information Read Only Memory Locations 2 Compressor Chillers Variable Name Address Range Conversion Units Description Active Chilled Water 045A 30 160 X 2 F Temperature Setpoint 15 80 F Circuit 1 Condenser 046
32. crew Chiller Open Protocol e Version 2 3 41 McQuay International Proprietary Information Circuit a Conditions at Time of Alarm 600 3630 X 10 100 F Suction Temperature 40 to 263 F Circuit 4 Current Alarm 08B7 1 35 129 163 umm ud below Circuit Z4 Current Alarm Hour Minute Circuit 4 Evaporator Pressure 0487 8 0 1500 X 10 0 150 PSI Circuit 4 Discharge Temperature 049D E 600 3630 X 10 100 40 to 263 F Circuit 4 Status 0430 0 13 See circuit status list below Circuit 4 Discharge Superheat 04EB C 0 2360 pe 10 F Temperature 0 to 263 F Circuit 4 Suction Temperature 049B C 600 3630 dt 10 100 40 to 263 F 0 to 263 F fis sus Compresor 2 Operating Hours sers Komweerfisum tacts Compresor 3 Operating Hours Compresor Starts tats Compressor Operating Hours sso ime Compresior Stars Evaporator Entering Water Temperature 5046 600 3630 X 10 100 F 40 to 263 F Evaporator Leaving Water Temperature 0461 2 600 3630 X 10 100 F 40 to 263 F Outdoor Air Temperature 0470 1 600 3630 X 10 100 40 to 263 F Stage of Cooling 042B 0 16 Unit Status 0427 a unit status list below Active Chilled Water Temperature Setpoint 045A The setpoint used by the chiller to control the leaving water t
33. crew chiller s in this document each have a simulator monitor software and are available on McQuay Online The software is intended to be a live monitoring version of this document You will be able to test acquiring data from your interface to a simulator controller We have disabled all of the sensor tasks from our real controller code to furnish a simulator control code which is the cod file s in your directory where you have installed the monitor software This code in most cases will not simulate changing of control modes it is intended to serve this purpose If a detailed sequence of operation is required to further understand the operation of any unit please consult the appropriate Operation Manual OM These documents are available upon request and are currently NOT on McQuay Online Logging on to the software If you have an old copy of the monitor software that has not been updated yet anda password is required and you can not get into the software please contact McQuay International Controls and Network Systems Marketing group on McQuay On line The current contact is Chuck Lehn Simulator Monitor software released after January 1 1997 will have a username MCQUAY password PARTNER MicroT ech Monitor Log in Screen xi Log in Name MCQUAY Password PARTNER Quit Monitor MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 57 McQuay International Proprietary Information Communications Initialization A
34. does not matter what the values are in terms of the points listed later in this document Because of the different functionality of each software configuration memory locations and therefore the Open Protocol interfaces to the four possible MicroTech chillers are slightly different The Open Protocol integrator must know which software configuration the screw chiller is using to know which Open Protocol memory locations are applicable The selling McQuay representative knows this information If the unit is already installed the IDENT information may be read directly off of the unit s keypad display McQuay International Proprietary Information Hexadecimal values are indicated by a preceding In addition software IDENTs are stored within the controllers in memory locations 0A08 0A0F The above IDENTs result when the memory locations are translated into ASCII For example control processor code for a two compressor chiller might be SC23U20N which would be represented as 53 43 32 33 55 32 30 4E Typical Open Protocol Control Functions MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 The Open Protocol allows automation integrators to achieve many control functions that in the past would require hardwired interfaces between the building automation system BAS and the chiller Using Open Protocol it is possible to eliminate much of the expensive field wiring and provide the interface thro
35. e I amp M 5 Outdoor Air Temperature Chilled Water Reset To reset from a hardwired 4 20 mA signal write 2 to 090B The chilled water supply temperature will then be controlled from a range of 44 F Evaporator Leaving Water Setpoint to 54 F Maximum Chilled Water Temperature Reset Setpoint 10 F plus the Evaporator Leaving Water Temperature Setpoint 44 F At4 mA or below the temperature setpoint will be 44 F At 20 mA the temperature setpoint will be 54 F To reset through communication write 3 to 090B The chilled water supply temperature will then be controlled from a range of 44 F Evaporator Leaving Water Setpoint to 54 F Maximum Chilled Water Temperature Reset 10 F Evaporator Leaving Water Temperature Setpoint 44 F You may write 0 through 100 MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 53 McQuay International Proprietary Information reset to the Network Evaporator Leaving Reset If you write a 0 the temperature setpoint will be 44 F If you write a 100 the temperature setpoint will be 54 F MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 54 McQuay International Proprietary Information Required Development Testing Tools Developing and testing an Open Protocol interface for the air cooled screw chillers requires 1 1 Model 250 1 Model 120 optional to test OPM configuration 1 Power supply with power cord and adapter cables 1 RS 2
36. emperature This is the combination of setpoint and reset values MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 42 McQuay International Proprietary Information Circuit 1 Condenser Pressure 0467 0468 Measured pressure in condenser in circuit 1 Circuit 1 Conditions at Time of Alarm Capacity 1013 Capacity at which circuit 1 was running at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Condenser Pressure 1C09 1C0A Condenser pressure in circuit 1 at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1COF 1C10 Evaporator leaving water temperature at time of circuit 1 alarm occurrence Circuit 1 Conditions at Time of Alarm Evaporator Pressure 1C07 1C08 Evaporator pressure in circuit 1 at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Fan Stage 1C14 Fan stage in operation at time of circuit 1 alarm occurrence Maximum fan stages per model ALS300 340 4 ALS360 425 5 Circuit 1 Conditions at Time of Alarm Outdoor Air Temperature 1C11 1C12 Outdoor air temperature at time of circuit 1 alarm occurrence Circuit 1 Conditions at Time of Alarm Suction Temperature 1COB 1COC Measured temperature in circuit 1 suction line at time of alarm occurrence Circuit 1 Current Alarm 08B9 No Alarms 0 Low Evap No Start Cid O notused Low Ambient Start O 9 MicroTech Ai
37. erature in F of the outdoor air Applies to air cooled units only Stage of Cooling 042B Stage of cooling capacity at which the chiller is currently operating Unit Status 0427 Defined values 0 Off Manual Setpoint 1 Off S 1 System Switch 2 Off Remote Communication 3 Off Remote Switch 4 Off Time Schedule 5 Off Alarm 6 Off Pump Down Switches 7 Off Ambient Lock 8 Starting 9 Waiting For Flow 10 Waiting For Load 11 Cool Stage Up 12 Cool Stage Down 13 Cooling 14 Manual Cool Staging MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 50 McQuay International Proprietary Information Read Write Memory Locations 4 Compressor Chillers Gear Greve A Arm soa Joa Gear Grewit Alarm Gear Greit 9 arm o1 Gear Greit 4 Alarm sw o1 Evaporator Entering Water 090D 30 160 X 2 Temperature Setpoint 15 F 80 F Evaporator Leaving Water 0905 20 160 X 2 Temperature Setpoint 10 F 80 F Maximum Chilled Water Reset 090C 0 90 X 2 Setpoint 0 F 45 F Network Command 044F 0 1 0 Enable 1 Disable Network Demand Limit 044D 0 100 Percent Network Evaporator Leaving 044E 0 100 Percent Water Temperature Reset Reset Option Setpoint 090B 0 5 Clear Circuit 1 Alarm 091A Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared Clear Circuit 2 Alar
38. ffect The memory for Network Command is a RAM location that upon loss and subsequent restoration of power is initialized to Enable MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 52 McQuay International Proprietary Information Network Demand Limit 044D The chiller can be Demand Limited two ways either by a hardwired 4 20 mA signal or by network communications Here is the formula C C 1 905 N 501 100 Where C Number of cooling stages S 4 20 mA range in percent N Network range in percent Example 1 If there are twelve cooling stages and 50 has been written to the Network Demand Limit No external 4 20 mA signal is wired 12 12 1 0 50 50 100 12 11 50 50 100 6 stages Maximum Limit Example 2 If there are twelve cooling stages the input from the 4 20 signal is 8 mA and the Network Demand Limit is zero 12 12 1 25 0 50 100 12 11 25 50 100 9 stages Maximum Limit Network Evaporator Leaving Water Temperature Reset 044E This location contains the percentage of chilled water temperature reset to be performed when Network Chilled Water Reset is selected as the Reset Option Setpoint below Reset Option Setpoint 090B Possible values 0 2 No Chilled Water Reset default 1 Return Chilled Water Reset see I amp M 224 20 mA Chilled Water Reset 3 Network Chilled Water Reset 4 Ice Chilled Water Reset se
39. fter logging in you will be asked to initiate communications Microl ech Monitor 1 0 2 Do you want to initiate communications If you are connecting to a simulator controller you will want to select YES If you are successful at connecting you will be at the main screen If you are unsuccessful you will see the following Opening COM port Connection initialized Checking Network Trying Trying Trying Can t talk to controller Connection Failed 1 Cancel Change Setup If you see this screen you may have a communications setup problem You may select the Change Setup function to change communications parameters You will come to a screen that looks like MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 58 McQuay International Proprietary Information General Setup Parameters Ed Monitor Title Open Protocol for AWR M Delete Communications Parameters Comm Port Connection Type Comm Password DIRECT Baud Rate Timeout secs PHONE Baud Rate Retries Auto e Scratch Pad File Prefix Line Printer Parameters Line Printer Port LPT1 Lines per Page p Printer Control Sting Modem Fax Fax Test Init Comm Cancel The problem is most likely you are using the wrong comm port on your PC Check to make sure you are using either Comm or Comm 2 The password for the controller will most likely be the default shown FFFFFFFF If for
40. hiller Open Protocol e Version 2 3 45 McQuay International Proprietary Information Circuit 2 Current Alarm Hour Year 1D01 1D06 These locations contain the time hour and minute and date day month and year that the alarm occurred Circuit 2 Evaporator Pressure 0465 0466 Measured pressure in evaporator in circuit 2 Circuit 2 Discharge Temperature 047B 047C This location contains the temperature in F of the compressor discharge refrigerant Circuit 2 Status 0429 Same as Circuit 1 above Circuit 2 Discharge Superheat Temperature 04E 1 04E2 This location contains the Discharge Superheat Temperature in F The Discharge Superheat Temperature is calculated by subtracting the condenser refrigerant Temperature from the discharge temperature Circuit 2 Suction Temperature 0477 0478 This location contains the temperature in F of the low pressure vaporized refrigerant entering the compressor Circuit 2 Superheat Temperature 04D9 04DA This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Circuit 3 Condenser Pressure 0481 0482 Measured pressure in condenser in circuit 3 Circuit 3 Conditions at Time of Alarm Capacity 1E13 Capacity at which circuit 3 was running at time of alarm occurrence Circuit 3 Conditions at Time of Alarm Condenser Pressure 1E09
41. icroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 10 McQuay International Proprietary Information OPM MCB and Screw MCB MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 11 McQuay International Proprietary Information Supplemental Literature It is the objective of this document to give an overview of the screw chiller and to document the available points offered through Open Protocol It is strongly recommended that the following documentation be used in conjunction with this document A detailed sequence of operation is described in the Operation and Maintenance OM manual if available Unit wiring details are given in the Installation and Maintenance manual if available Open Protocol wiring details and diagrams for connectors are given in the Open Protocol Wiring Diagrams booklet The generic Open Protocol Data Information Packet explains the how to access via the McQuay MicroTech protocol Open Protocol Data Information Packet Apr 96 IOMMALS Installation amp Maintenance Data Feb 98 CD573875Y Open Protocol Wiring Diagrams Conversions and Conventions Converting 2 Byte Variables In the following read only and read write tables a 2 byte variable address is indicated by a dash The first memory location listed will always be the high byte and the second memory location listed will be the low
42. ignal or by network communications Here is the formula C C 1 905 N 501 100 Where C Number of cooling stages 5 24 20 mA range in percent Network range in percent Example 1 If there are twelve cooling stages and 50 has been written to the Network Demand Limit No external 4 20 mA signal is wired 12 12 1 0 50 50 100 12 11 50 50 100 6 stages Maximum Limit Example 2 If there are twelve cooling stages the input from the 4 20 signal is 8 mA and the Network Demand Limit is zero 12 12 1 25 0 50 100 12 11 25 50 100 9 stages Maximum Limit Network Evaporator Leaving Water Temperature Reset 044E This location contains the percentage of chilled water temperature reset to be performed when Network Chilled Water Reset is selected as the Reset Option Setpoint below Reset Option Setpoint 090B Possible values 0 No Chilled Water Reset default 1 Return Chilled Water Reset see I amp M 2 4 20 mA Chilled Water Reset 3 Network Chilled Water Reset 4 Ice Chilled Water Reset see I amp M 5 Outdoor Air Temperature Chilled Water Reset To reset from a hardwired 4 20 mA signal write 2 to 090B The chilled water supply temperature will then be controlled from a range of 44 F Evaporator Leaving Water Setpoint to 54 F Maximum Chilled Water Temperature Reset Setpoint 10 F plus the Evaporator Leaving Water Temperature Setpo
43. ing 046E F 600 3630 X 10 100 Water Temperature 40 to 263 F Evaporator Leaving 0461 2 600 3630 X 10 100 Water Temperature 40 to 263 F Outdoor Air Temperature 047D E 600 3630 X 10 100 Dm 40 to o Stage of Cooling 042B Unit Status 0427 n unit status list below Active Chilled Water Temperature Setpoint 045A The setpoint used by the chiller to control the leaving water temperature This is the combination of setpoint and reset values Circuit 31 Condenser Pressure 0467 0468 Measured pressure in condenser in circuit 1 Circuit 1 Conditions at Time of Alarm Capacity 1F13 Capacity at which circuit 1 was running at time of alarm occurrence Circuit Z1 Conditions at Time of Alarm Condenser Pressure 1F09 1F0A Condenser pressure in circuit 1 at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1F0F 1F10 Evaporator leaving water temperature at time of circuit 1 alarm occurrence MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 16 McQuay International Proprietary Information Circuit 1 Conditions at Time of Alarm Evaporator Pressure 1F07 1F08 Evaporator pressure in circuit 1 at time of alarm occurrence Circuit 1 Conditions at Time of Alarm Fan Stage 1F14 Fan stage in operation at time of circuit 1 alarm occurrence Maximum fan stages per model ALS125 140 4 ALS155 170 5 ALS175 204 6 C
44. int 44 F At 4 mA or below the temperature setpoint will be 44 F At 20 mA the temperature setpoint will be 54 F To reset through communication write 3 to 090B The chilled water supply temperature will then be controlled from a range of 44 F Evaporator Leaving Water Setpoint to 54 F Maximum Chilled Water Temperature Reset 10 F Evaporator Leaving Water Temperature Setpoint 44 F You may write 0 through 100 reset to the Network Evaporator Leaving Reset If you write a the temperature setpoint will be 44 F If you write a 100 the temperature setpoint will be 54 F MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 38 McQuay International Proprietary Information Read Only Memory Locations 4 Compressor Chillers Active Chilled Water Temperature 045A 30 160 X 2 F Setpoint 15 80 F Circuit 1 Condenser Pressure 0467 8 0 4500 X 10 PSI 0 450 PSI Circuit 1 Conditions at Time of Alarm 1C13 0 100 Percent Capacity Circuit 1 Conditions at Time of Alarm 1C09 A 0 4500 X 10 PSI Condenser Pressure 0 450 PSI Circuit 1 Conditions at Time of Alarm 1COF 10 600 3630 X 10 100 Evaporator Leaving Water Temperature 40 to 263 F Circuit 1 Conditions at Time of Alarm 1C07 8 0 1500 X 10 Evaporator Pressure 0 150 PSI Circuit 1 Conditions at Time of Alarm 1 14 0 5 Fan Stage Circuit 1 Conditions at Time of Alarm 1C11 2 600 3630 X 10 100 Outdoor Air Temperature 4
45. ircuit 1 Conditions at Time of Alarm Outdoor Air Temp 1F11 1F12 Outdoor air temperature at time of circuit 1 alarm occurrence Circuit 1 Conditions at Time of Alarm Suction Temperature 1F0B 1F0C Measured temperature in circuit 1 suction line at time of alarm occurrence Circuit 1 Current Alarm 08B9 LowEvapNoStrt 7 High Liquid Press Drop not used High Condenser Pressure Mechanical High Pressure not used N N t2 rto ro MicroTech Air Cooled Screw Chiller Open Protocol Version 2 3 17 McQuay International Proprietary Information Alarm Name Active Bad Discharge Temp Sensor Bad Compressor Suction Temp Sensor Bad Evaporator Pressure Sensor Circuit 1 Current Alarm Hour Year 1F01 1F06 These locations contain the time hour and minute and date day month and year that the alarm occurred Circuit 1 Evaporator Pressure 0463 0464 Measured pressure in evaporator in circuit 1 Circuit 1 Discharge Temperature 0479 047A This location contains the temperature in F of the compressor discharge refrigerant Circuit 1 Status 0428 Defined values 0 Off S 1 System Switch 1 Off Manual Setpoint 2 Off Alarm 3 Off Pump Down Switch 4 Off Wait For Cycle Timers 5 Off Wait For Flood Timer 6 Off Ready to Start 7 Start Pump
46. itions at Time of Alarm Liquid Line Temperature 1DOD 1DOE Measured temperature in circuit 2 liquid line at time of alarm occurrence Circuit Z2 Conditions at Time of Alarm Outdoor Air Temp 1D11 1D12 Outdoor air temperature at time of circuit 2 alarm occurrence Circuit 2 Conditions at Time of Alarm Suction Temperature 1D0B 1D0C Measured temperature in circuit 2 suction line at time of alarm occurrence Circuit 2 Current Alarm 08BA Same as Circuit 1 Above Circuit Z2 Current Alarm Hour Year 1D01 1D06 These locations contain the time hour and minute and date day month and year that the alarm occurred Circuit 2 Discharge Temperature 0489 048A This location contains the temperature in F of the high pressure vaporized refrigerant leaving the compressor Circuit 42 Evaporator Pressure 0465 0466 Measured pressure in evaporator in circuit 2 Circuit 42 Liquid Line Temperature 047B 047C This location contains the temperature in F of the liquid refrigerant entering the expansion valve Circuit 2 Status 0429 Same as Circuit 1 above Circuit 2 Discharge Superheat Temperature 04E1 04E2 This location contains the Discharge Superheat Temperature in F The Discharge Superheat Temperature is calculated by subtracting the condenser refrigerant Temperature from the discharge temperature Circuit 2 Suction Temperature 0477 0478 This location contains the temperature in F
47. larm is cleared MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 36 McQuay International Proprietary Information Evaporator Entering Water Temperature Setpoint 090D Temperature setpoints are not stored as direct representations of a temperature They are stored as temperature 2 This will allows temperatures to be specified in 0 5 F increments Example 54 5 F is stored as 109 decimal Default value of Evaporator Entering Water Temperature Setpoint is 108 54 F Evaporator Leaving Water Temperature Setpoint 0905 Default value of Evaporator Leaving Water Temperature Setpoint is 88 44 F Maximum Chilled Water Reset Setpoint 090C Default value of Maximum Chilled Water Reset Setpoint is 20 10 F Network Command 044F The Network Command is a way to disable the chiller through the Open Protocol interface If all other enable disable features are in the enabled position writing a 1 to the Network Command memory location will disable the chiller If any of the enable disable features is in the disabled position the Network Command will have no effect The memory for Network Command is a RAM location that upon loss and subsequent restoration of power is initialized to Enable MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 37 McQuay International Proprietary Information Network Demand Limit 044D The chiller can be Demand Limited two ways either by a hardwired 4 20 mA s
48. m 091B Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 51 McQuay International Proprietary Information Clear Circuit 3 Alarm 097F 1 Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared Clear Circuit 4 Alarm 0980 1 Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared Evaporator Entering Water Temperature Setpoint 090D Temperature setpoints are not stored as direct representations of a temperature They are stored as temperature 2 This will allows temperatures to be specified in 0 5 F increments Example 54 5 F is stored as 109 decimal Default value of Evaporator Entering Water Temperature Setpoint is 108 54 F Evaporator Leaving Water Temperature Setpoint 0905 Default value of Evaporator Leaving Water Temperature Setpoint is 88 44 F Maximum Chilled Water Reset Setpoint 090C Default value of Maximum Chilled Water Reset Setpoint is 20 10 F Network Command 044F The Network Command is a way to disable the chiller through the Open Protocol interface If all other enable disable features are in the enabled position writing a 1 to the Network Command memory location will disable the chiller If any of the enable disable features is in the disabled position the Network Command will have no e
49. mperature Setpoint 15 80 F Evaporator Leaving Water 0905 20 160 Temperature Setpoint 10 80 F Maximum Chilled Water 090C 0 90 Reset Setpoint 0 45 F Network Command 044F O Enable 1 Disable Network Demand Limit 044D Network Evaporator Leaving 044E Water Temperature Reset Reset Option Setpoint 090B Clear Circuit 1 Alarm 091A 1 Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 21 McQuay International Proprietary Information Clear Circuit 2 Alarm 091B 1 Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared Evaporator Entering Water Temperature Setpoint 090D Temperature setpoints are not stored as direct representations of a temperature They are stored as temperature 2 This will allows temperatures to be specified in 0 5 F increments Example 54 5 F is stored as 109 decimal Default value of Evaporator Entering Water Temperature Setpoint is 108 54 F Evaporator Leaving Water Temperature Setpoint 0905 Default value of Evaporator Leaving Water Temperature Setpoint is 88 44 F Maximum Chilled Water Reset Setpoint 090C Default value of Maximum Chilled Water Reset Setpoint is 20 10 F Network Command 044F The Network Command is a way to disable the chiller through the Open Protocol interface If all other enable disable
50. nning total of starts for compressor 1 Compressor 2 Operating Hours 0864 0865 Cumulative total of operating hours for compressor 2 Compressor 2 Starts 086C 086D Running total of starts for compressor 2 Evaporator Entering Water Temperature 046E 046F This location contains the temperature in F of the chilled water entering the evaporator Evaporator Leaving Water Temperature 046 1 0462 This location contains the temperature in F of the chilled water leaving the evaporator Outdoor Air Temperature 047D 047E This location contains the ambient temperature in F of the outdoor air Stage of Cooling 042B Stage of cooling capacity at which the chiller is currently operating Unit Status 0427 Defined values 0 Off Manual Setpoint 1 Off S 1 System Switch 2 Off Remote Communication 3 Off Remote Switch 4 Off Time Schedule 5 Off Alarm 6 Off Pump Down Switches 7 Off Ambient Lock 8 Starting 9 Waiting For Flow 10 Waiting For Load 11 Cool Stage Up 12 Cool Stage Down 13 Cooling 14 Manual Cool Staging MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 20 McQuay International Proprietary Information Read Write Memory Locations 2 Compressor Chillers Clear Circuit 1 Alarm 091A Clear Active Alarm 0 Do Nothing Clear Circuit 2 Alarm 091B Clear Active Alarm 0 Do Nothing Evaporator Entering Water 090D 30 160 Te
51. ocations of Conditions at Time of Alarm have been revised for 3 Compressor Chillers Version 1 1 This is a formatting revision only Version 1 0 The initial release of the document MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 McQuay International Proprietary Information Overview Compatible Unit Control Software for Open Protocol The asterisk wildcard any character is valid MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 The McQuay Open Protocol for air cooled screw chillers allows other automation integrators to communicate with a network of screw chillers or a single screw chiller and obtain useful operating information through communication reads to the controller In addition remote control of the screw chiller is possible by communication writes to the controller of new setpoints and commands Air cooled screw chillers included in this Open Protocol Document McQuay International manufactures four different MicroTech air cooled screw chillers Their software configurations are summarized as follows Configuration Unit Model Number Software IDENT ALS 125 through 204 C22 30 ALS 205 through 280 SC32 30 ALS 300 through 425 SC42 30 Software IDENT varies depending on the refrigerant type first in IDENT is either be 2 3 or 6 the second in the IDENT could either be U E or S it is the system of units to be displayed on the unit keypad It
52. or writing to trailing memory locations This is OK since not all of the trailing memory locations are task timers MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 62 McQuay International Proprietary Information Read Write Screen Ed NetAdd 00 FF MemAdd 0300 0301 0302 0303 0304 0305 0306 0307 0308 0309 030A 030B 030C 030D 030F Hex al 01 03 04 05 06 07 08 41 41 OF 02 03 04 41 06 07 NetAdd MemAdd 0310 0311 0312 0313 0314 0315 0316 0317 0318 0319 031A 031B 031C 031D O31E 031F HexVal 01 02 03 04 05 06 4C 4C OA OF OF OO OF M 06 NetAdd MemAdd 0320 0321 0322 0323 0324 0325 0326 0327 0328 0329 032A 032B 032C 032D 032E 032F Hex al 06 81 OF 01 OF 01 FF OO OO OO 85 00 OO OO 83 00 NetAdd MemAdd HexVal Display Address Hexadecimal Memory Address 0300 2F Controller Address ASCII 00 FF Status Monitoring Controller O0ff sid Controller 00 ff eo Further Information on Windows Monitor Software This document should get you started using Windows Monitor You should not have to use any of the other functions of Windows Monitor in order to test your interface If further information on Windows Monitor is desired please refer to McQuay International MicroTech Monitor 1 0 for Windows User s Manual MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 63 McQuay International Proprietary Information Glossary of Terms ALS McQu
53. pen Protocol e Version 2 3 29 McQuay International Proprietary Information Alarm Name Active High Liquid Press Drop Circuit 1 Current Alarm Hour Year 1C01 1C06 o A AJN These locations contain the time hour and minute date month and year that the alarm occurred Circuit 1 Discharge Temperature 0487 0488 This location contains the temperature in F of the high pressure vaporized refrigerant leaving the compressor Circuit 1 Evaporator Pressure 0463 0464 Measured pressure in evaporator in circuit 1 Circuit 1 Liquid Line Temperature 0479 047A This location contains the temperature in F of the liquid refrigerant entering the expansion valve MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 30 McQuay International Proprietary Information Circuit 1 Status 0428 Defined values 0 Off S 1 System Switch 1 Off Manual Setpoint 2 Off Alarm 3 Off Pump Down Switch 4 Off Wait For Cycle Timers 5 Off Wait For Flood Timer 6 Off Ready 7 Start Pump Down 8 Pump Down 9 Start Requested 10 Pre purge 11 Open Solenoid 12 Low Ambient Start 13 Cooling Circuit 1 Discharge Superheat Temperature 04DF 04E0 This location contains the Discharge Superheat Temperature in F The Discharge Superheat Temperature i
54. r Circuit 1 Superheat Temperature 04D7 04D8 This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Circuit 2 Condenser Pressure 0469 046A Measured pressure in condenser in circuit 2 Circuit 2 Conditions at Time of Alarm Capacity 1D13 Capacity at which circuit 2 was running at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Condenser Pressure 1D09 1D0A Condenser pressure in circuit 2 at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1D0F 1D10 Evaporator leaving water temperature at time of circuit 2 alarm occurrence Circuit 2 Conditions at Time of Alarm Evaporator Pressure 1D07 1D08 Evaporator pressure in circuit 22 at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Fan Stage 1D14 Fan stage in operation at time of circuit 2 alarm occurrence Maximum fan stages per model ALS300 340 4 ALS360 425 5 Circuit 2 Conditions at Time of Alarm Outdoor Air Temperature 1D11 1D12 Outdoor air temperature at time of circuit 2 alarm occurrence Circuit 2 Conditions at Time of Alarm Suction Temperature 1D0B 1D0C Measured temperature in circuit 2 suction line at time of alarm occurrence Circuit 2 Current Alarm 08BA Same as Circuit 1 above MicroTech Air Cooled Screw C
55. r Cooled Screw Chiller Open Protocol e Version 2 3 43 McQuay International Proprietary Information Alarm Name Active 16 19 20 21 22 2 24 25 26 27 28 29 30 32 33 34 35 Circuit 1 Current Alarm Hour Year 1C01 1C06 These locations contain the time hour and minute and date day month and year that the alarm occurred Circuit 1 Evaporator Pressure 0463 0464 Measured pressure in evaporator in circuit 1 Circuit 1 Discharge Temperature 0479 047A This location contains the temperature in F of the compressor discharge refrigerant Circuit 1 Status 0428 Defined values 0 Off S 1 System Switch 1 Off Manual Setpoint 2 Off Alarm 3 Off Pump Down Switch 4 Off Wait For Cycle Timers 5 Off Wait For Flood Timer 6 Off Ready 7 Start Pump Down 8 Pump Down 9 Start Requested 10 Pre purge 11 Open Solenoid 12 Low Ambient Start 13 Cooling MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 44 McQuay International Proprietary Information Circuit 1 Discharge Superheat Temperature 04DF 04E0 This location contains the Discharge Superheat Temperature in F The Discharge Superheat Temperature is calculated by subtracting the condenser refrigerant Temperature from the discharge temperature Circuit 1 Suction Temperature 0475 0476 This location contains the temperature in F of the low pressure vaporized refrigerant entering the compresso
56. r Temp 1E11 1E12 Outdoor air temperature at time of circuit 3 alarm occurrence Circuit 3 Conditions at Time of Alarm Suction Temperature 1E0B 1E0C Measured temperature in circuit 3 suction line at time of alarm occurrence Circuit 3 Current Alarm 08BE Same as Circuit 1 Above Circuit 23 Current Alarm Hour Year 1E01 1E06 These locations contain the time hour and minute and date day month and year that the alarm occurred MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 33 McQuay International Proprietary Information Circuit 3 Discharge Temperature 049B 049C This location contains the temperature in F of the high pressure vaporized refrigerant leaving the compressor Circuit 3 Evaporator Pressure 047F 0480 Measured pressure in evaporator in circuit 3 Circuit 3 Liquid Line Temperature 0485 0486 This location contains the temperature in F of the liquid refrigerant entering the expansion valve Circuit 3 Status 042A Same as Compressor 1 and 2 above Circuit 3 Discharge Superheat Temperature 04E9 04EA This location contains the Discharge Superheat Temperature in F The Discharge Superheat Temperature is calculated by subtracting the condenser refrigerant Temperature from the discharge temperature Circuit 3 Suction Temperature 0483 0484 This location contains the temperature in F of the low pressure vaporized refrigerant entering the compressor
57. s calculated by subtracting the condenser refrigerant Temperature from the discharge temperature Circuit 1 Suction Temperature 0475 0476 This location contains the temperature in F of the low pressure vaporized refrigerant entering the compressor Circuit 1 Superheat Temperature 04D7 04D8 This location contains the Superheat Temperature in F The superheat temperature is calculated by subtracting the evaporator refrigerant temperature from the Suction Temperature Circuit 2 Condenser Pressure 0469 046A Measured pressure in condenser in circuit 2 Circuit 2 Conditions at Time of Alarm Capacity 1D13 Capacity at which circuit 2 was running at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Condenser Pressure 1D09 1D0A Condenser pressure in circuit 2 at time of alarm occurrence Circuit 2 Conditions at Time of Alarm Evaporator Leaving Water Temperature 1D0F 1D10 Evaporator leaving water temperature at time of circuit 2 alarm occurrence Circuit 2 Conditions at Time of Alarm Evaporator Pressure 1D07 1D08 Evaporator pressure in circuit 2 at time of alarm occurrence MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 31 McQuay International Proprietary Information Circuit 2 Conditions at Time of Alarm Fan Stage 1D14 Fan stage in operation at time of circuit 2 alarm occurrence Maximum fan stages per model ALS205 220 4 ALS235 280 5 Circuit 2 Cond
58. tor Monitor Software From the Main Menu choose Screen and select Monitor Unit Double click the appropriate screen to start seeing simulator data If you do not start seeing data you may not have established a connection to the controller Controller List x Controller Label Label Description Address UnitType Main Main Screen 00 FF NoUnit Standalone Standalone Unit 00 00 PE200 Master PFH Master Dual Unit 01 00 PE200 Slave PFH Slave Dual Unit 01 01 PE200 MasterLLLB Master LLLB Configuration 02 00 PE200 SlaveLLLB Slave LLLB Configuration 02 01 PE200 Add Edi Delete Cancel Support Menu Read Write screens You may want to use the read write screen in conjunction with the monitor screens to double check the raw data values coming back from the controller The following screen is an example of how to use the read write screen for comparison The Monitor Screen option has been selected and the read write option has also been selected from the main menu support option MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 61 McQuay International Proprietary Information Comp Comp Comp Comp Comp Comp Comp Comp Conde Decimal Conde wetadd Conde MemAdd Conde Decimal Conde r Operation Conde Conde Bead Decimal Conde NetAdd 00 FF MemAdd 0905 Monitor Read Only Locations Table 1 of 4 Chilled VVater Temperature Actual Setpoint 0
59. ues 0 Off Manual Setpoint 1 Off S 1 System Switch 2 Off Remote Communication 3 Off Remote Switch 4 Off Time Schedule 5 Off Alarm 6 Off Pump Down Switches 7 Off Ambient Lock 8 Starting 9 Waiting For Flow 10 Waiting For Load 11 Cool Stage Up 12 Cool Stage Down 13 Cooling 14 Manual Cool Staging MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 35 McQuay International Proprietary Information Read Write Memory Locations 3 Compressor Chillers sm foa cear Crewe stm sem o3 aum Evaporator Entering Water 090D 30 160 X 2 F Temperature Setpoint 15 F 80 F Evaporator Leaving Water 0905 20 160 X 2 F Temperature Setpoint 10 F 80 F Maximum Chilled Water Reset 090C 0 90 X 2 Setpoint 0 F 45 F Network Command 044F 0 1 0 Enable 1 Disable Network Demand Limit 044D 0 100 Percent f Network Evaporator Leaving 044E 0 100 Percent Water Temperature Reset Reset Option Setpoint 090B 0 5 Clear Circuit 1 Alarm 091A Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared Clear Circuit 2 Alarm 091B 1 Clear Active Alarm 0 Do Nothing Memory location will change to zero when alarm is cleared Clear Circuit Z3 Alarm 091F Clear Active Alarm 0 Do Nothing Memory location will change to zero when a
60. ugh communications These are the typical Open Protocol control functions e Remote start stop of the chiller e Chilled water reset e Demand limit e Remote alarm clearing Remote Start Stop of the Chiller Using communication writes to the Network Command memory location the McQuay MicroTech chiller may be commanded to be enabled or disabled This is the preferred method of remotely turning the chiller on or off When the Network Command is Disable the LCD display on the chiller will show Off RemoteComm The memory for Network Command is a RAM location that upon loss and subsequent restoration of power is initialized to Enable Thus the automation system should refresh this memory location to the desired state on a frequent basis such as every minute A standard feature of the MicroTech controller is an output dedicated to control of the chiller s evaporator pump We recommend using this output to control the pump Chilled Water Reset Chilled water reset is achieved quite easily through communications See the Network Evaporator Leaving Water Temperature Setpoint Demand Limit An automation system can establish the maximum number of cooling stages that can be active for the chiller through the Network Demand Limit setpoint This is vital for systems that seek to reduce chiller capacity at certain times to avoid peak electrical demand charges McQuay International Proprietary Information Remote Alarm Cle
61. ure 40 to 263 F Circuit 2 Status 0429 0 13 See circuit status list below Circuit 2 Discharge Superheat Temperature Circuit 2 Suction 0477 8 600 3630 X 10 100 F Temperature 40 to 263 F Circuit 2 Superheat 04D9 A 0 2360 X 10 F Temperature 0 to 263 F Circuit 3 Condenser 0481 2 0 4500 X 10 PSI Pressure 0 450 PSI Circuit 3 Conditions at 1E13 0 100 Percent Time of Alarm Capacity Circuit 3 Conditions at 1E09 A 0 4500 10 PSI Time of Alarm 0 450 PSI Condenser Pressure Circuit 3 Conditions at STEOF 10 600 3630 X 10 100 F Time of Alarm 40 to 263 F Evaporator Leaving Water Temperature Circuit 3 Conditions at 1E07 8 0 1500 PSI Time of Alarm 0 150 PSI Evaporator Pressure Circuit 3 Conditions at 1E14 0 5 Time of Alarm Fan Stage Circuit 3 Conditions at 1E0D E 600 3630 X 10 100 F Time of Alarm Liquid 40 to 263 F Line Temperature Circuit 3 Conditions at 1E11 2 600 3630 X 10 100 F Time of Alarm Outdoor 40 to 263 F Air Temp Circuit 3 Conditionsat 1 0 600 3630 X 10 100 Time of Alarm Suction 40 to 263 F Temperature MicroTech Air Cooled Screw Chiller Open Protocol e Version 2 3 McQuay International Proprietary Information Variable Name Range Conversion Circuit 3 Current Alarm 08BE 0 35 See alarm list below Circuit 3 Current Alarm Hour Minute Month Date Year Circuit 3 Discharge 049B C 600 3630

MicroTech Air Cooled Screw Chiller Open Protocol

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