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Installation Manual 06/1995

1. 24 Software 3000 10 Troubleshooting Power Problems 24 Software Compatibility 10 Troubleshooting Communications Problems 24 Troubleshooting Analog Input Problems 25 MicroTech Monitoring and Networking Options 11 Troubleshooting the LED Status Board 25 PG Monitoring esis ee innate 11 Troubleshooting the Keypad Display Board 26 Network Master Panel 11 MCB 160 6 8 27 Installations sca dni Mata eh eas 12 Parts Eet 27 Panel Location and Mounting 12 Eeler lt 77 13 mwee ee 13 Network Communications ssseeeeeeeseeeeeeeeereeeeeerreeee 13 External Chilled Water Reset Signal 16 External Demand Limiting Gional 16 Temperature Sensors 17 Remote Stop Switch or External Time Clock 17 PG GOnnectiOne see 18 Page 2 IM 498 McQuay MicroTech and SeasonPak are registered trademarks of McQuay International Monitor is a trademark of McQuay International Microsoft and MS DOS are registered trademarks of Microsoft Corporation Windows is a trademark of Microsoft Corpora
2. 23 MCB Power Supply Termimnals 24 lt 1 Tables MicroTech Unit Controller Installation Literature 4 Model Specific Chiller Installation Literature 4 Green and Red Status LED Indication 8 Amber Status LED Indication 8 Program Code RMS U13B Software Compatibility 10 PC Specification 11 RMS Panel Environmental Specifications 12 Features Requiring Temperature Inputs 17 Network Communications Field Wiring Terminals 21 Port B Voltages AMP Twpe 22 Thermistor Chart 25 IM 498 Page 3 Introduction This manual provides information about the MicroTech Remote Monitoring and Sequencing RMS Panel for McQuay SeasonPak reciprocating and screw chillers It describes the components field wiring options and re quirements network commissioning procedures and serv ice procedures For a description of operation and information on using and programming the MicroTech RMS Panel refer to Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel For specific information about the MicroTech chiller controllers refer to the appropriate MicroTech unit controller installation manual see Table 1
3. Use an ohmmeter to test for shorts at the network communications field wiring terminal block For the three combinations of conductor pairs there should be infinite resistance between the conductors see Table 9 If you find a resistance that is high but less than infinite it indicates that one or more nonpowered controllers are connected to the trunk These controllers should be located and disconnected Note The first check should test for shorts throughout the entire trunk however it is important that it be done at every controller Breaks in the trunk may exist 3 Plug the network communications connector into the B port 4 Verify that there is power to the MCB and then check for proper port B voltage levels Use a DC voltmeter to test for proper voltages at the network communications field wiring terminal block With one lead on the control panel chassis ground check the voltage at the and ground terminals see Table 9 The proper voltages are shown in Table 10 Note that the port B terminal labels in Table 10 are for the AMP type connectors used on the RMS and chiller controllers Figure 17 shows the terminal configuration for this AMP connec tors socket which is mounted on the MCB board The terminals are labeled on both the socket and the plug but they re hard to see For communications to occur each networked controller must have proper voltages at its port B ter minals When the
4. For installation and commissioning instructions and gen eral information on a particular chiller refer to its model specific installation manual see Table 2 Table 1 MicroTech Unit Controller Installation Literature Chiller Type Installation amp Maintenance Data Bulletin Number VS M5 Table 2 Model Specific Chiller Installation Literature Installation amp Maintenance Data Chiller Model Bulletin Number A WARNING Electric shock hazard Can cause personal injury or equipment damage This equipment must be properly grounded Connections and service to the MicroTech control panel must be performed only by personnel that are knowledgeable in the operation of the equipment being controlled A CAUTION Static sensitive components A static discharge while handling electronic circuit boards can cause damage to the components Discharge any static electrical charge by touching the bare metal inside the control panel before performing any service work Never unplug any cables circuit board terminal blocks or power plugs while power is applied to the panel NOTICE This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this instruction manual may cause interference to radio communications It has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC rules These limits are designed to provide rea
5. 144 689 0 859 53 2595 2 194 145 676 0 846 84 2534 2164 146 662 n 85 2474 2135 147 649 0818 86 2416 2 106 148 637 0 805 87 2360 2077 149 625 0 792 58 2305 2 049 150 613 0 779 89 2251 2 020 151 601 0 766 50 2199 1 992 152 589 0 753 91 2149 1 965 153 578 0 741 92 2099 1 937 154 567 0 729 53 2051 1 909 155 556 0 717 94 2004 1 882 156 546 0 706 55 1959 1 855 157 535 0 694 34 9258 3608 9 1914 1 828 158 525 0 683 57 1871 1802 159 516 0 673 s 1829 1 775 160 506 0 661 37 8512 3597 99 1788 1 750 161 496 0 650 100 1747 1 724 162 487 0 640 101 1708 1 698 163 478 0 629 40 7832 3511 102 1670 1 673 164 469 0 619 103 1633 1 648 165 461 0 610 104 1597 1 624 166 452 0599 105 1562 1 600 167 444 0 590 106 1528 1 576 168 436 0 580 45 6831 3 365 107 1494 1 552 169 428 DEI 108 1461 1 528 170 420 0 561 109 1430 1 505 171 3 0 553 48 6299 3274 110 1398 1 482 172 405 0 544 111 1368 1 459 173 398 0 535 112 1339 1437 174 39 0 527 51 5814 3183 113 1310 1415 175 384 0 518 114 1282 1 393 176 377 0 510 15 1254 1371 177 370 050 54 5371 3 078 116 1228 1 350 178 364 0 494 117 1201 1 328 179 357 0 485 118 1176 1 308 180 351 0478 m 1151 1 287 181 345 047 120 1127 1 267 182 339 0 463 59 4714 2934 121 1103 1 247 183 333 0 456 122 1080 1 227 184 327 0 448 123 1058 1 208 185 321 044 62 4363 2839 124 1036 1189 186 316 0 435 125 1014 1170 187 310 0 427 126 993 1151 188 305
6. battery backed Super VGA graphics capability Super VGA monitor Printer Bus mouse or trackball 101 enhanced keyboard 9600 baud modem compatible with the AT command set optional MS DOS 6 2 or higher Microsoft Windows 3 1 or higher MicroTech Monitor software Minimum Configuration 386SX processor 16 MHz 4 MB of RAM 60 MB hard disk drive 31 floppy disk drive Serial port 9 or 25 pin male Com1 or Com2 ternal time clock battery backed GA graphics capability GA monitor Serial mouse or trackball 101 enhanced keyboard 1200 baud modem compatible with the AT command set optional MS DOS 5 0 Microsoft Windows 3 1 MicroTech Monitor software 486DX processor 66MHz orbetter Cf 3865 processor 16 MHz o y 8MBofRAM S OSABO 120 MB hard disk drive orbetter COMB ard disk drive S 3 floppy disk drive lt 3410 disk drive Serial port 9 pin male Com1 or Com2 Serial port 9 or 25 pin male ComtorCom2 Parallel port Internal time clock batterybacked Internal time clock batterybacked Super VGA graphics capability EVGA graphics capability Super VGA monitor VGA monitor S a EEN Bus mouse ortrackball Seria mouse or trackball o 101 enhanced keyboard dO enhanced keyboard O S 9600 baud modem compatible with the AT command set optional 1200 baud modem compatible with the AT command set optional MS DOS 6 2 or MSDOS S e Microsoft
7. connected to a ground other than the MicroTech con troller chassis be sure that it is providing an isolated output or condition the output with a signal isolator For chillers included in an RMS network there are two optional chilled water temperature reset methods available outside air temperature and external 4 20 mA signal The return and ice reset methods which are available with stand alone chillers cannot be used with chillers in an RMS network Either of these methods or no reset can be selected at the RMS controller keypad or PC The external reset option requires field wiring to implement If selected the external reset option linearly resets each chillers leaving evaporator water temperature setpoint as the input signal varies between 4 and 20 mA At 4 mA and below there will be no reset At 20 mA the leaving evapo rator water temperature setpoint will be increased by the maximum amount possible this amount is keypad or PC adjustable For more on reset refer to Chilled Water Reset in the Chiller Plant Control Features section of Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel Cable Specification The cable for the external chilled water reset signal must meet the following minimum requirements twisted shielded with drain wire 300 V 60 C 20 AWG polyethyl ene insulated with a PVC outer jacket Depending on the application either two conductors Belden 8762 or e
8. 12 VDC power to the LED Status Board and 5 VDC power to the back light on the Keypad Display Board Refer to the panel s wiring diagram or Figure 19 for more information Power In Terminal Strip The MCB receives 18 VAC center tapped power from transformer T2 through the Power In terminal strip This power drives all logic and communications circuitry the Aux Out terminal strip the LED Status Board and the Keypad Display Board Refer to the panel s wiring diagram or Figure 19 for more information Power Fuses Two identical 2 amp fuses are located to the right of the Power In terminal strip These fuses are in the MCB power supply circuit Page 8 IM 498 Microprocessor Status LEDs The green red and amber LEDs on the MCB provide information about the operating status of the microproces sor The amber LED also indicates the existence of alarm conditions in the chiller network The Alarm LED on the LSB board also does this Following is the normal start up sequence that the three status LEDs should follow when power is applied to the MCB 1 The red Reset LED turns on and remains on for approximately 5 seconds During this period the MCB performs a self test 2 The red LED turns off and the green Running LED turns on This indicates that the microprocessor has passed the self test and is functioning properly 3 The amber Active LED remains off continually if no alarm conditions exist in the ch
9. 48 ADI terminal S Connections to terminal 41 12 VDC power supply and terminal 49 ADI terminal G may or may not be required For additional information see the unit wiring diagram and Bulletin No IM 549 MicroTech Screw Chiller Controller Temperature Sensors The RMS controller has several standard features that require the outdoor air temperature zone temperature or both to implement Table 8 summarizes these features For more information on them see Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel Table 8 Features Requiring Temperature Inputs Zone Outdoor Air RMS Panel Feature lt Temperature Optimal Start Outdoor Air Reset Low Ambient Lockout Cooling Degree Day Totalization With the optional MicroTech RMS Sensor Kit zone and outdoor air temperature sensors can be connected to the RMS Panel Note that the RMS controller can read the outdoor air temperature from any associated chiller that has an outdoor air sensor connected to it In this case the RMS Sensor Kit is required only to connect a zone sensor for optimal start control If none of the chillers associated with the RMS controller have outdoor air sensors the RMS Sensor Kit must be installed to take advantage of any of the above features The outdoor air temperature source is defined at the RMS Panel s keypad or a PC during the commissioning process The RMS Sensor Kit s part number is 005718
10. Connection in the Field Wiring section of this manual Port B Port B is for MicroTech network communications using the RS 485 interface standard A twisted shielded pair cable should be connected to port B via terminals B B and GND on terminal block TB2 The communications rate is 9600 baud For more information see Network Communications in the Field Wiring section of this manual Keypad Display Board The Keypad Display Board KDB gives you a local inter face with the RMS controller and a remote interface with the chiller controllers All operating conditions system alarms control parameters and schedules can be moni tored from Figure 8 Keypad Display Board KDB C gt 1 RMS Status Chiller1 Enabled CATEGORY MENU ITEM ACTION STATUS ALARMS t t CLEAR PREV PREV INCR CONTROL SWITCH noa Gg GE I 4 2 ENTER the display If the password has been entered any adjustable parameter or schedule can be modified with the keypad Because the display is backlit the liquid crystal characters are highly visible regardless of the ambient light level You can adjust the display contrast with a small pot located on the back of the board see Figure 5 For information on using the keypad display refer to the Getting Started portion of Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel LED Status Board The LED Status Board LSB w
11. GROUND LOOPS NOTE TO FIELD WHEN A REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK IS CONNECTED TO ANY CHILLER THE JUMPER MJ SCREW CHILL BETWEEN TERMINALS 60 amp 61 MUST BE REMOVED o STOP ea REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK FOR CHILLER 2 REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK FOR CHILLER 3 LEGEND FACTORY WIRING lt FIELD WIRING TERMINAL SS FIELD WIRING CABLE SHIELDED TWISTED AND JACKETED PAIR WITH DRAIN WIRE PRINTED CIRCUIT BOARD TERMINAL IM 498 Page 15 2 Connect the network cable in a daisy chain manner as shown in Figures 13 and 14 Use caution to assure that the correct polarity is maintained at each control ler Be sure to connect each cable s shield to the con trollers as shown in the figures Like the positive and negative conductors the shield ground con ductor must be continuous over the trunk 3 If a Network Master Panel is included in the network connect its B port to the trunk in a similar fashion External Chilled Water Reset Signal A CAUTION Ground loop current hazard Can cause equipment damage The external reset signal must be isolated from any ground other than the MicroTech controller chassis ground If it is not ground loop currents could occur which could damage the MicroTech controller If the device or system providing the external reset signal is
12. VDC analog input signals The chiller s Analog Digital Input ADI board conditions all inputs before they enter the MCB The external demand limiting signal which enters the ADI board at input A7 is conditioned with a 250 ohm resistor This on board resistor is connected between the S signal terminal and G ground terminal of input A7 Note that the G terminal is earth ground see caution above This input arrangement will convert a 4 20 mA signal to a 1 5 VDC signal The maximum allowable volt age at the S terminal is 30 V If desired an unregulated 12 VDC power supply on the chillers MCB board can be used to power the demand limiting signal output device If this power supply is used the total external load cannot exceed 100 mA Reciprocating Chiller Refer to Figure 13 Wire the demand limiting signal to the terminals appropriate for the application In all cases connect the shield to terminal 133 ground and the varying signal to terminal 132 ADI termi nal S Connections to terminal 146 12 VDC power sup ply and terminal 131 ADI terminal G may or may not be required For additional information see the unit wiring diagram and Bulletin No IM 493 MicroTech Reciprocating Chiller Controller Screw Chiller Refer to Figure 14 Wire the reset signal to the terminals appropriate for the application In all cases connect the shield to terminal 47 ground and the varying signal to terminal
13. Windows 3 1 orhigher Microsoft Windows 3 1 0 MicroTech Monitor software MiicroTech Monitor software If a serial pointing device is used there must be another serial port Com1 or Com2 available for connecting the PC to the MicroTech controller IM 498 Page 11 Installation Panel Location and Mounting The RMS Panel is suitable for indoor use only Table 7 lists the allowable temperature and humidity ranges Locate the panel at a convenient height for operation of the keypad display and allow adequate clearance for the door swing Mount the panel to the wall with screws or bolts It weighs 40 pounds Four 4 inch openings are provided at the corners of the panel Panel dimensions are shown in Figure 12 The RMS Panel is equipped with special door hinges that have a friction adjustment screw By adjusting this screw you can prevent the panel door from swinging open or closed unexpectedly Figure 12 RMS Panel Dimensions Table 7 RMS Panel Environmental Specifications Panel State Relative Humidity gt EES 0 95 7 8 Dia knockouts 3 on left and right sides Hinge friction adjustment screw 99 14 3 4 8 1 4 olf 1 3 4 A A 1 4 Dia 2 ef 1 4 Dia mounting slots 2 14 1 2 16 1 2 1 3 4 1 A ag 14 gt lt Left Side View A Front V
14. a known good ribbon cable and keypad display These may come for example from a chiller controller The keypad display does not need a back light Swap these components separately to isolate the problem Remove power from the controller before disconnecting the suspect component and restore power after connecting the replacement component If the problem persists it is likely that the MCB is defective Note The keypad display and MCB must be powered up together otherwise the display will be blank Therefore if the keypad display is ever disconnected from the MCB and then reconnected power to the controller must be cycled to restore the display You can cycle power to the controller by opening and then closing circuit breaker CB1 MCB Replacement If an MCB board is defective and must be replaced the proper controller software must be loaded into the re placement MCB This can be done either at the factory or at the building site if a PC equipped with appropriate Monitor software is available The factory will download the proper controller software into a replacement MCB board before it is shipped if you include the RMS controllers program code with the re placement MCB part order If the program code is not provided the MCB board will be shipped without software Job specific Monitor software includes each unit and auxiliary controller s program Therefore it is possible to download the proper controller software to a r
15. conjunction with a PC and Monitor software it gives the building operator the capa bility to perform advanced equipment control and monitor ing from a central or remote location The following fea tures are provided by the optional NMP more information on connecting the PC to the controller refer to PC Connection in the Field Wiring section of e Remote unit monitoring this manual e Advanced scheduling features For the most convenience and best operation the PC e Advanced alarm management should be considered dedicated to the MicroTech system e Global operator override by unit type However you can exit the Monitor program to perform e Demand metering other tasks without affecting equipment control Refer to e Historical electrical data logging the users manual supplied with the Monitor software for additional information For further information contact your McQuay sales representative PC Specification A direct or remote connected computer can be used for monitoring RMS Panel and chiller operation changing setpoints scheduling trend logging downloading software and diagnostics The PC must be an IBM or 100 true compatible Table 6 shows the preferred and minimum PC specifications Table 6 PC Specification Preferred Configuration 486DX processor 66MHz or better 8 MB of RAM 120 MB hard disk drive or better 31 floppy disk drive Serial port 9 pin male Com1 or Com2 Parallel port Internal time clock
16. f 310 904 at gt i 1 e te yf sv ov Ty lv 2 907 MCB 5 we 53 gt TEMP Sie 908 932 Z L 115 VOLTS AC NA z g POWER SUPPLY 55 A 930 E ZONE FUSED 15 AMPS Bes gt Z BE 531 gt 4 2 AUX OUT DIGITAL OUTPUTS l 987654321 LAA ALALLLI 1 901 940 5 16 941 GND ane 2 g OPTIONAL RMS SENSOR KIT e gt er ge eg E CBI D 05 AMP H2 d H Lss 900 Y HoT IM 498 Page 23 Test Procedures A listing of MicroTech related part numbers is included in the Parts List section of this manual If the MCB must be replaced refer to the MCB Replacement section of this manual Status LED Diagnostics The MCB status LED indications can aid in controller diag nostics If the status LEDs do not operate normally as described in the Component Data section of this manual see Table 3 there is a problem with the MCB Following are troubleshooting procedures for the various symptoms Red LED Remains On If the red LED remains on after the 5 second self test pe riod it is likely that the MCB is defective However this can also occur in some instances if there is a power supply problem Refer to Troubleshooting Power Problems below Red and Green LEDs Off If the red and green LEDs do not turn on after power is applied to the controller there is likely a defective compo nent or a problem in the controller s power distribution circuits R
17. improper voltage levels are found verify that the level 1 RMS Panel or NMP is energized and that the communications trunk wiring is intact 5 Verify that there is power to the MCB and then plug the network communications connector into the B port 6 Verify that network communications have begun Go to the RMS Panel s keypad display and select the chiller just connected If the controller you just connected is a level 2 RMS Panel go to step 7 To do this press the SWITCH key and then quickly press the NEXT key in the Menu key group Repeat this keystroke combination as necessary to get the desired chiller The Unit Selection LED for the selected chiller will il luminate The keypad display should show the chiller controller s data If communications do not exist the message Com munications lost w chiller will appear in the display In this case check the terminations between the B port and the field terminal block at the chiller and if no other chillers are communicating its RMS Panel If the chiller controller just connected is associated with a level 2 RMS Panel make sure that this RMS Panel s level was changed from 1 to 2 Note If the level 2 controller is not an RMS or chiller controller you need a PC to verify communications Refer to the users manual provided with the Monitor software for more information 7 Go to the next controller and repeat steps 3 through 6 8 After finishing the last level 2 contro
18. 0 421 65 4042 2 745 127 973 1133 189 299 0 413 128 953 1 115 190 294 0 407 129 933 1 097 191 289 0400 S 3748 2 651 130 914 1 079 192 284 0 304 131 895 1 062 193 280 0 389 132 877 1 045 194 275 0 382 3477 2 558 133 859 1 028 195 270 0 376 72 3392 2 527 134 842 1 012 196 266 0 371 3309 2 496 135 825 0 995 197 261 0 364 136 809 0 980 198 257 0 359 137 792 0 963 199 252 0 353 3074 2 404 138 777 0 948 200 248 0 348 Open or Shorted Temperature Sensor Circuits The controller can assist in the diagnosis of temperature sensor problems by displaying either open or short instead of a temperature value on menu 7 of the keypad display If menu 7 indicates a problem check the sensor circuit wiring for shorts or disconnections If the sensor circuit wiring and connections are intact the sensor is probably defective Verify this by performing the following Erro neous Temperature Readings procedure Erroneous Temperature Readings If it is Suspected that the controller is operating using erro neous temperature data the following procedure can be used to check for problems 1 Remove power from the controller by opening circuit breaker CB1 Verify that the MCB to SIB and MCB to KDB ribbon cable connections are proper Look for bent pins After reconnecting the ribbon cables restore power to the controller 2 Measure the temperature at the suspect sensor using an accurate thermome
19. 6701 Cable Specification Temperature sensor cable must meet the following mini mum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Wiring Instructions Installation and wiring instructions for the MicroTech RMS Sensor Kit are included in Bulletin No IM 501 This bulletin is included with the kit The sensor wiring terminations are shown on the panel wiring diagram and Figures 13 and 14 Remote Stop Switch or External Time Clock If desired a remote stop switch an external time clock or both can be wired to a digital input D13 at each chiller These two applications have different purposes but the effect is the same when the digital input circuit is open RMS Panel control is overridden and the chiller is disabled Twisted shielded cable is not required for remote stop switch or external time clock wiring but it can be used The switch or contacts used must be rated for low voltage 24 VAC and low current 11 mA Remote Stop Switch A remote stop switch or dry contacts can be used to shut down an individual chiller from a remote location A sepa rate switch must be connected to each chiller for which remote stop capability is required When a chillers remote switch is op
20. Board Component Defective If one of the LEDs the alarm horn or the alarm volume trim pot is bad the LSB board must be replaced All LEDs Out If there is power to the panel two LEDs should always be lit the Comm O K LED and one of the Unit Selection LEDs If the green status LED on the MCB is lit but no LEDs on the LSB are lit perform the following procedure 1 Check the ribbon cable and connections between the LSB and the MCB Look for bent pins 2 Check for 12 VDC at terminal 1 on the H1 plug on the LSB Refer to the panel wiring diagram or Figure 19 To take the voltage reading pull the plug back about IM 498 Page 25 one eighth of an inch and place the test lead against the exposed pin Place the other lead on chassis ground If there is no voltage go to step 3 If there is 12 VDC the LSB is probably defective 3 Check the wiring and connections between the Aux Out terminal strip and the LSB If the wiring is intact the MCB is probably defective Troubleshooting the Keypad Display Board The Keypad Display Board is connected to the MCB via a 26 conductor ribbon cable and discrete wiring for the back light The MCB provides operating voltages control signal outputs for the display and input conditioning for the key pad inputs Display is Hard to Read The clarity of the LCD display can be affected by ambient temperature Typically less contrast will result with cooler temperatures If the display is di
21. M Q Installation and uay Maintenance Data International Bulletin No IM 498 June 1995 Part No 571560Y 01 MicroTech Remote Monitoring and Sequencing Panel for Reciprocating and Screw Chillers Photos of panel and chillers For Use With McQuay Models ALR WHR ALS amp PFS Contents uge elle TEE A Network Commissioning 19 Applying the RMS 0 4 Addressing the Controllers seeeseeeeeeeeeeeeeeeeeeeeeee 19 Chiller Controller Setup ssseseseeeeeeeeeeeeeeeereeereeereeen 20 General Description 7 RMS Controller 5 20 Connecting the Communications Trunk 21 Component Data 7 Microprocessor Control Board 8 Service Information 23 Keypad Display 80 1 gt 9 LED Status Board sissies 9 Wiring Diagram 91 EE 23 Sensor Input Board 10 Temperature Sensors seeeeeeeeeeeeeeeeeree re eerrernr resene 10 TeSt PrO Ced 24 Status LED 08 68
22. MCB power supply input fuses F1 and F2 with an ohmmeter See Figure 20 A good fuse will have negligible resistance through it less than 2 ohms If either or both fuses are blown replace them Go to step 4 If the fuses are intact the MCB is defective 4 Reconnect the Power In plug and disconnect all other connectors on the MCB Cycle power to the controller close and then open CB1 and check the power fuses If both fuses are intact go to step 5 Page 24 IM 498 If either fuse blows the MCB is defective 5 Reconnect the keypad display ribbon cable Cycle power to the controller and check the power fuses If both fuses are intact go to step 6 If either fuse blows check the keypad display and the connecting ribbon cable for shorts Either one may be defective 6 Reconnect the analog input ribbon cable if any Cycle power to the controller and check the power fuses If both fuses are intact go to step 7 If either fuse blows check the SIB board the con necting ribbon cable the thermistors and the field wiring for shorts Any of these may be defective 7 Reconnect the Aux Out connector plug to the MCB Disconnect the 12 VDC power plug from the LSB Cycle power to the controller and check the power fuses If both fuses are intact go to step 8 If either fuse blows it is likely that the keypad display is defective 8 Reconnect the digital output ribbon cable to the MCB Reconnect the 12 VDC power plug t
23. Network The typical RMS network includes one RMS Panel and one two or three chillers It may also include other level 2 unit or auxiliary controllers that could be accessed with a PC via network communications In this case the RMS controller is the level 1 controller and the chiller controllers are level 2 controllers Since the RMS Panel is level 1 its hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue con secutively to a maximum of 3F decimal 63 There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controller s hex switches can be set to any value To keep the system simple you should consider addressing the reciprocating and screw chillers according to their designations For example assume that a MicroTech network includes an RMS Panel two reciprocating chillers and one applied rooftop air handling unit One possible addressing scheme is as follows Hex Switch Setting Controller 00 RMS Panel 01 Chiller 1 02 Chiller 2 03 Rooftop air handling unit PC accessible only Note If a PC or modem is connected to a level 2 con troller that controller should have as low an address as possible This will improve the performance of network communications because it will reduce the required value of the RMS controller s Total Slaves parameter and thus the amount of polling For example if a modem is con nect
24. U MA DEMAND LIMITING GROUND f FOR ALL CHILLERS lt SEE BULLETIN NO IM 498 o STOP e a REMOTE STOP SWITCH WE OR EXTERNAL TIME CLOCK NO IM 4 es lt ee eee fir CHILLER 1 LOOPS NOTE TO FIELD WHEN A REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK IS CONNECTED TO ANY CHILLER THE JUMPER MJ BETWEEN TERMINALS 140 amp 141 MUST BE REMOVED STOP REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK FOR CHILLER 2 AUTO o STOP REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK FOR CHILLER 3 AUTO ED AND DRAIN WIRE TERMINAL Figure 14 Field Wiring Schematic Screw Chillers HARDWARE BY OTHERS is xe OPTIONAL MONITOR SOFTWARE PKG POWER SUPPLY OPTIONAL CABLE KIT FUSED 15 AMPS NEUTRAL UTDOOR R TEMP SENSOR ZONE TEMP SENSOR OPTIONAL RMS SENSOR KIT EW CHILLE UNREGULATED INTERNAL 12 VDC POWER SUPPLY FOR FIELD USE 100 MA MAX LOAD INPUT A6 g An EXTERNAL CHILLED WATER RESET GROUND FOR ALL CHILLERS meee SEE BULLETIN NO IM 498 ee 4 20 MA INPUT AZ 9 e DEMAND lt LIMITING 250 GROUND FOR ALL CHILLERS e El SEE BULLETIN NO IM 498 o STOP ent REMOTE STOP SWITCH CAUTION OR EXTERNAL REFER TO TIME CLOCK BULLETIN NO IM 498 CR eR CONCERNING
25. air temperature sensors to the Figure 5 Control Panel Layout controller All of these major components are mounted inside a standard NEMA 1 enclosure They are interconnected by ribbon cables shielded multi conductor cables or discrete wiring Power for the system is provided by transformers T1 and T2 Following are descriptions of these MicroTech compo nents and their input and output devices IM 498 Page 7 Microprocessor Control Board The Microprocessor Control Board MCB is shown in Figure 6 It contains a microprocessor that is prepro grammed with the software required to monitor and control up to three chillers The MCB coordinates all communica tions between the RMS controller and the chiller control lers When appropriate it enables and disables chillers as required by its schedule the current lead lag configuration and the cooling load The various MCB connections and components are described below Figure 6 Microprocessor Control Board MCB Analog Inputs Connection The MCB receives conditioned analog inputs from the Sensor Input Board through the Analog Inputs port via a plug in ribbon cable These inputs are 0 5 VDC analog signals Digital Outputs Connection After processing all input conditions and network data the MCB sends the appropriate output signals to the LED Status Board through the Digital Outputs port via a plug in ribbon cable Aux Out Terminal Strip The Aux Out terminal strip provides
26. alarm in the RMS Panel or any of the chillers This will occur regardless of the current unit selection Alarm Horn If it is enabled the piezo alarm annunciator alarm horn will sound whenever an alarm occurs in the RMS Panel or any of the chillers This will occur regardless of the current unit selection To silence the alarm horn press the ALARMS key while the RMS Panel is the selected controller You can adjust the alarm horn s volume with a small pot located on the LSB board You can also set up the horn so that it sounds only when certain types of alarms occur comm IM 498 Page 9 loss faults or problems For more information refer to the Alarm Monitoring section of Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel Note Silencing the alarm horn does not clear an alarm To clear an alarm from the RMS Panel you must first select the chiller with the alarm and then clear it For more infor mation refer to the Alarm Monitoring section of Bulletin No OM 118 Sensor Input Board The Sensor Input Board SIB is included in the optional RMS Sensor Kit part no 0057186701 It collects the zone and outdoor air temperature sensor signals converts them into 0 5 VDC signals and sends them to the MCB via a plug in ribbon cable Figure 10 Sensor Input Board SIB Temperature Sensors The RMS controller uses negative temperature coefficient thermistors for temperature sensing A thermistor char
27. cations you can The PC must be equipped with MicroTech Monitor software Note During the network commissioning process all chillers must be temporarily shut down Plan accordingly Addressing the Controllers For network communications to occur each controller in the network must have a unique network address A con troller s hex switch setting defines its network address A chiller controller s hex switch setting also defines its chiller designation which is used by the RMS controller for lead lag and sequencing control for example Chiller 1 For more on hex switch settings see Microprocessor Control Board in the Component Data section of this manual After changing a hex switch setting power to the MCB must be cycled to set the new address into memory In the RMS Panel you can do this by opening and then closing circuit breaker CB1 In the chiller controllers you can do this by opening and then closing the circuit breaker that supplies power to the MicroTech controller located near the MCB The hex switches are set differently depending on whether or not there is a Network Master Panel NMP or more than one RMS Panel in the network Following are instructions on how to set them Note If a chiller is running you should shut it down before removing power from the chiller controller Do this by placing the Circuit No 1 and Circuit No 2 switches in the Pumpdown and Stop position The Typical
28. e same conduit with power wiring Note Ideally one continuous piece of cable should connect any two controllers This will reduce the risk of communications errors If the cable must be spliced use crimp type butt connectors better or solder best Do not use wire nuts Wiring Instructions Regardless of whether the RMS controller is level 1 or level 2 the network connection to the RMS and chiller controllers is at port B on their MCB boards As shown in Figures 13 and 14 field wiring to port B on these control lers can be accomplished by connecting the network cable to terminals B B and GND in the RMS Panel terminals 137 138 and 139 in each reciprocating chiller panel and terminals 53 54 and 55 in each screw chiller panel Note that the chiller designations shown in Figures 13 and 14 Chiller 1 Chiller 2 Chiller 3 are estab lished by the network address not the physical position of the chiller in the daisy chain The networked controllers can be wired in any order For example the RMS controller could be connected between Chiller 1 and Chiller 2 It is highly recommended that the installing contractor keep track of the physical order of the controllers on the daisy chained trunk This will facilitate troubleshooting any net work communications problems that may occur For more on the network address see Addressing the Controllers in the Network Commissioning section of this manua
29. ed to Chiller 3 you should consider setting Chiller 3 s hex switches to 01 See the RMS and Chiller Controller Setup section in Bulletin No OM 118 for more information IM 498 Page 19 Networks With an NMP If an RMS Panel is included in a network that has an NMP the NMP must be the level 1 controller In this case an RMS Panel is a level 2 controller and the chiller controllers are also level 2 controllers Since the NMP is level 1 its hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue con secutively to a maximum of 3F decimal 63 There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controller s hex switches can be set to any value Two or more RMS Panels and multiple chillers are possible in this type of network For example assume that a MicroTech network includes an NMP an RMS Panel two screw chillers and one ap plied rooftop air handling unit One possible addressing scheme is as follows Hex Switch Setting Controller 00 NMP 01 RMS Panel 02 Rooftop air handling unit PC accessible only 03 Chiller 1 04 Chiller 2 Networks With Two or More RMS Panels and No NMP If two or more RMS Panels are included in a network that does not include an NMP one of the RMS Panels must be the level 1 controller In this case the other RMS Panels are level 2 controllers and the chiller controll
30. ee chillers are piped in parallel 2 a common primary chilled water pump serves all chillers 3 the primary pump is also used to distribute water to the cooling loads and 4 water always flows through each chiller regardless of whether it is on or off IM 498 Page 5 Figure 4 Primary Pump Distribution Common Chiller Pump Without Isolation Valves Page 6 IM 498 In this system the temperature of the water entering the loads depends upon the number of operational chillers If all chillers are on the temperature will be very close to each chillers leaving evaporator water temperature set point If some chillers are on and some are off the tem perature will be higher than each chillers leaving evapora tor water temperature setpoint because the cooler water leaving the active chiller s mixes with the warmer water leaving the inactive chiller s The MicroTech Remote Monitoring and Sequencing RMS Panel is a microprocessor based controller designed to provide sophisticated control of up to three MicroTech equipped SeasonPak reciprocating or screw chillers In addition to providing remote chiller monitoring via network communications the RMS controller is capable of se quencing two or three chillers as the cooling load varies An automatic lead lag selection ensures that chiller run time is equalized A 12 key keypad and a 2 line by 16 character display give you access to the RMS controller s status information setpoin
31. efer to Addressing the Con trollers in the Network Commissioning section of this manual for more information Note You can change the setting of a hex switch with a slotted blade screwdriver that has a s2 inch tip If a hex switch setting is changed power to the MCB must be cy cled in order to enter the new setting into memory This can be done by opening and then closing the push button cir cuit breaker CB1 in the panel Figure 7 Hex Switches Communication Ports The MCB has two communication ports port A and port B Each port has six terminals and is set up for both the RS 232C and RS 485 data transmission interface standards The male and female connectors for these ports are manufactured by AMP Therefore they are referred to as AMP plugs or AMP connectors throughout this manual Socketed fuses located next to the ports protect the com munications drivers from voltage in excess of 12 V Fol lowing are brief descriptions of each port s function Port A Port A is for communications with an IBM com patible PC using the RS 232C interface standard The PC can be directly connected over a limited distance with a twisted shielded pair cable or it can be remotely con nected via phone lines with a modem Port A can also be used to connect a licensed building automation system to the MicroTech network via Open Protocol The default communications rate is 9600 baud For more information see PC
32. efer to Troubleshooting Power Problems below Troubleshooting Power Problems The MCB receives 18 VAC center tapped power from transformer T2 It then distributes both 5 VDC and 12 VDC power to the various MicroTech components A problem that exists in any of these components can affect the MCB and thus the entire control system Power problems can be caused by a external short which can blow a fuse or a defective component which can either blow a fuse or cre ate an excessive load on the power supply An excessive load can lower the power supply voltages to unacceptable levels Use the following procedure to isolate the problem Note that this procedure may require two or three spare MCB fuses see parts list Refer to the panel wiring dia gram or Figure 19 as you proceed 1 Verify that circuit breaker CB1 is closed 2 Remove the MCB Power In terminal strip connector and check for 9 VAC between the terminals on the plug corresponding to terminals 2 and 3 on the board see Figures 6 and 20 Then check for 9 VAC between the terminals on the plug corresponding to terminals 1 and 3 on the board Readings of 9 12 VAC are acceptable If 9 VAC is present between both sets of terminals go to step 3 If 9 VAC is not present between both sets of termi nals check transformers 12 and 11 and all wiring between the 115 VAC source and the Power In plug 3 Remove power from the controller by opening circuit breaker CB1 Check the
33. el must be properly grounded by connecting the ground lug GRD to earth ground Refer to Figure 13 or 14 Power wiring must be sized to carry at least 5 amps To gain access to the high voltage section remove the deadfront barrier It is attached to the panel with two 5 6 inch hex screws Replace this deadfront when the wiring is complete The panel is internally protected with a 0 5 amp circuit breaker CB1 which is located inside the panel on the underside of the high voltage section see Figure 5 This push button circuit breaker can also be used as an on off switch for the panel When the push button is in the panel should be energized When the push button is out the panel should be de energized Note that a white ring on the switch shaft is visible when the push button is out Network Communications For network communications to occur a twisted shielded pair cable must be connected between the RMS Panel its associated chillers and any other MicroTech unit or auxil iary controllers This interconnecting daisy chain wiring is shown in Figures 13 and 14 Network communications is accomplished using the RS 485 interface standard at 9600 baud The typical network configuration which is shown in Figures 13 and 14 consists of the RMS Panel and one two or three chillers Unusual applications may include other MicroTech controllers for example a Network Master Panel Application Specific Controllers or Unit Ventilat
34. ened that chiller will be disabled As a result the RMS controller will not be able to start it if additional cooling capacity is required When a chillers remote switch is closed that chiller will be enabled As a result the RMS controller will be able to start it as required to meet the cooling load if it is not disabled for some other reason External Time Clock There are several methods of switching the chiller plant between occupied and unoccupied operation It can be done by the RMS Panel s internal schedule an NMP schedule assigned to the RMS Panel an operator override at the RMS Panel or an external time clock If an external time clock is used it must be wired so that a separate set of dry contacts is connected to the remote stop input of each chiller If there are not enough poles on the time clock use a relay The chiller plant will be in the occupied mode when the time clock s contacts close The chiller plant will be in the unoccupied mode when the time clock s contacts open For the external time clock to have absolute control over chiller plant scheduling all internal daily schedules in the RMS and chiller controllers must be set IM 498 Page 17 for continuous occupied operation this is the default setting For more information see the Scheduling section of Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel Note The optimal start feature is not available if an external time cl
35. eplacement MCB at the building site if a PC equipped with that job s Monitor software is available In addition if the controller s configuration data was stored on the PC hard drive prior to the MCB failure the exact configuration data including all keypad programmable setpoints and parameters can be restored Refer to the user s manual supplied with the Monitor software for more information Parts List Designation Microprocessor Control Board Keypad Display Board LED Status Board Sensor Input Board Transformer 115 24 VAC Transformer 24 18 VAC Center Tapped Circuit Breaker Ribbon Cable Assembly 26 Conductor MCB to LSB Ribbon Cable Assembly 26 Conductor MCB to KDB Fuse MCB Input Power 2 Amp Bussman No GDC 2A Fuse MCB Communication Ports 0 25 Amp RMS Sensor Kit PC Communications Cable Kit RS 232 Cable Extension Kit Modem Kit Notes Description 654873B 06 654972B 02 664011A 01 571870A 01 606308B 01 467381B 14 350A733H01 664012B 01 654997B 05 658220A 01 658219A 01 0057186701 0057186802 0065487001 0072140601 1 If desired the factory can download the correct software into the replacement MCB prior to shipment See the MCB Replacement section above for more information 2 MCB part number 654873B 06 includes a high memory chip In addition to itself this part replaces MCB boards with part numbers 654873B 01 and 654873B 03 IM 498 Page 27 McQuay Internatio
36. ers are also level 2 controllers The level 1 RMS Panel s hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue consecutively to a maximum of 3F decimal 63 There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controller s hex switches can be set to any value For example assume that a MicroTech network includes two RMS Panels and four screw chillers Each RMS Panel will control and monitor two chillers One possible address ing scheme is as follows Hex Switch Setting Controller 00 RMS Panel A 01 RMS Panel B 02 Chiller 1 for RMS Panel A 03 Chiller 2 for RMS Panel A 04 Chiller 1 for RMS Panel B 05 Chiller 2 for RMS Panel B Note The only advantage to creating a network like this is to allow a PC access to all networked controllers If there is no PC each RMS Panel should be set up as a level 1 controller in a separate network as described above in The Typical Network Note If a PC or modem is connected to a level 2 con troller that controller should have as low an address as possible A level 2 RMS Panel should also have as low an address as possible This will improve the performance of network communications because it will reduce the re quired value of the level 1 RMS controller s Total Slaves parameter and thus the amount of polling For example if a modem i
37. fficult to read adjust the contrast trim pot which is located on the back of the keypad display assembly see Figure 5 Back Light Not Lit The Keypad Display Board supplied with the RMS Panel is equipped with a back light If the light does not come on check for 5 VDC at terminal 1 on the J4 plug on the KDB Refer to the panel wiring diagram or Figure 19 Note that this terminal is the one closest to the ribbon cable connec tor To take the voltage reading pull the plug back about one eighth of an inch and place the test leads against the exposed pins If there is no voltage check the wiring and Page 26 IM 498 connections between the Aux Out terminal strip and the KDB If the wiring is intact the MCB is probably defective Display is Blank or Garbled If the MCB appears to be functioning properly and the display is completely blank or garbled perform the follow ing procedure 1 Try cycling power to the controller by opening and then closing circuit breaker CB1 see note below 2 Try adjusting the contrast trim pot which is located on the back of the keypad display assembly see Fig ure 5 If the contrast trim pot has no effect it is likely that either the keypad display or its ribbon cable is defective 3 After removing power from the controller check the ribbon cable and connections between the keypad display and the MCB Look for bent pins Restore power after reconnecting the ribbon cable 4 Try swapping
38. hich includes two sets of LEDs and an alarm horn allows you to quickly determine overall chiller plant status It is shown in Figure 9 Figure 9 LED Status Board LSB Unit Selection Indicators Four Unit Selection LEDs clearly indicate which controller in the network the RMS Panel s keypad display is interfaced with For example if the Chiller 1 Unit Selection LED is lit the RMS Panel s keypad display will act exactly as if it were the keypad display at Chiller 1 A special combination of keystrokes allow you to change controllers System Status Indicators Five System Status LEDs show the overall status of the chiller plant Communications LED The Comm O K LED will be on continually when communications to all connected chillers is normal If the RMS controller detects a commu nication problem with any chiller in the network the LED will flash Depending on whether the communications failure is partial or total the flash will occur either occa sionally or continually For example if communications are lost with one chiller in a three chiller network the Comm O K LED will flash one third of the time Chiller On LEDs The Chiller 1 On Chiller 2 On and Chiller 3 On LEDs indicate at a glance which chill ers are currently in a cooling mode of operation If an LED is lit that chiller is operating at stage 1 or higher Alarm LED The red Alarm LED will blink whenever there is an
39. hillers in these configurations can be all reciprocating all screw or a mixture of reciprocating and screw Page 4 IM 498 The RMS Panel may be suitable for applications other than the four listed above If your application does not match one of these four contact your McQuay sales repre sentative for assistance Note If two or three chillers are in an RMS Panel net work the RMS Panel will always sequence those chillers The RMS Panel cannot be set up for remote monitoring only Primary Pump Distribution Individual Chiller Pumps Chiller plant configuration 1 Primary Pump Distribution Individual Chiller Pumps is shown in Figure 1 The distin guishing characteristics of this configuration are as follows 1 two or three chillers are piped in parallel 2 each chiller has its own primary chilled water pump 3 the primary pumps are also used to distribute water to the cooling loads and 4 the system may or may not have a bypass line and a valve that is controlled by a differential pressure controller if there is no bypass line three way valves are typically used at the loads Figure 1 Primary Pump Distribution Individual Chiller Pumps In this system the temperature of the water entering the loads will always be very close to each chillers leaving evaporator water temperature setpoint Primary Pump Distribution Common Chiller Pump With Isolation Valves Chiller plant configuration 2 Primary Pump Dis
40. ible to connect two or more PCs to the network but only one PC can be connected to any one controller The PC that is used most often should be connected to the level 1 controller for better performance For example you may have one PC that you use at the building during the week and another PC that you use at home on weekends In this situation you may want to connect the on site PC to the level 1 controller and the modem for the off site PC to a level 2 controller The RMS controllers default port A communications rate is 9600 baud however it can be changed For more information see the RMS and Chiller Controller Setup section in Bulletin No OM 118 MicroTech Remote Monitor ing and Sequencing Panel Note If a PC is connected to a level 2 controller a level 1 RMS Panel must be set up to poll that level 2 con troller so that the PC will have access to the entire network You can do this at the RMS controller s keypad display by adjusting the Total Slaves parameter which is located under menu 21 Misc Setup See the RMS and Chiller Controller Setup section in Bulletin No OM 118 for more information Page 18 IM 498 Direct Connection An RS 232 communications cable kit that allows a PC to be directly connected to any MicroTech controller is available from McQuay International The part number is 0057186802 The cable has a female DB 9 connector for connection to the PC s 9 pin serial port If the PC has a 25
41. icroTech Screw Chiller Controller External Demand Limiting Signal A CAUTION Ground loop current hazard Can cause equipment damage The external demand limiting signal must be isolated from any ground other than the MicroTech controller chassis ground If it is not ground loop currents could occur which could damage the MicroTech controller If the device or system providing the external demand limiting signal is connected to a ground other than the MicroTech controller chassis be sure that it is providing an isolated output or condition the output with a signal isolator If desired an external 4 20 mA signal can be used to provide demand limiting for all chillers included in an RMS network The external demand limiting option requires field wiring to implement As the demand limiting signal varies between 4 and 20 mA the maximum number of stages available in each chiller varies At 4 mA and below all chiller stages will be available At 20 mA only one stage will be available Be tween 4 and 20 mA the number of available stages varies according to a step function The step function used de pends on the total number of stages the chiller is equipped with For more information refer to Demand Limiting in the Chiller Plant Control Features section of Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel Cable Specification The cable for the external demand limiting signal must meet the follow
42. iew 7 8 Dia knockouts 3 on top and bottom 12 1 8 Page 12 IM 498 Bottom View Field Wiring Following are descriptions of the various field wiring re quirements and options Some RMS controller features require field wiring to implement refer to the job plans and specifications All possible field wiring connections are shown in Figures 13 and 14 Wiring must comply with the National Electrical Code and all local codes and ordi nances The warranty is void if wiring is not in accordance with these instructions Note that the panel is divided into high and low voltage sections by a sheet metal barrier The power wiring should enter the high voltage section The temperature sensor wiring if any and the communications wiring should enter the low voltage section Wiring penetrations must be made only through the 7 s inch knockouts provided As shown in Figures 13 and 14 a typical chiller plant has the same type of chillers in it however this is not required The RMS Panel can control a mixture of McQuay reciprocating and screw chillers Power A WARNING Electric shock hazard Can cause personal injury or death This equipment must be properly grounded All protective deadfront panels must be reinstalled and secured when power wiring is complete The RMS Panel requires a 115 VAC power supply which should be connected to terminals L1 and L2 in the high voltage section of the panel The pan
43. iller network If alarm conditions exist the amber LED will flash as shown in Table 4 If the above sequence does not occur after power is applied to the controller there is a problem with the MCB or its power supply For more information refer to the Test Procedures section of this manual which is under Service Information Tables 3 and 4 summarize the green red and amber status LED indications Table 3 Green and Red Status LED Indication Green Red LED State LED State No power 1o MOB ff Off On Self test failure or power supply problem Eon or MCB operating normally For longer than 5 seconds Table 4 Amber Status LED Indication Amber LED Staes Indication Normal operation Alarm condition Keypad LCD Display Connection The MCB receives input commands and operating parame ters from the keypad and sends requested information to the display through the Keypad LCD Display port via a plug in ribbon cable On 1 2 second Off 1 2 second Hex Switches The MCB includes two hex hexadecimal switches that are used to set the RMS controller s network address The HI and LO hex switches are shown in Figure 7 A hex switch setting is defined as the HI switch digit fol lowed by the LO switch digit For example a hex switch setting of 2F would have the HI switch set to 2 and the LO switch set to F Typically the RMS controllers hex switch setting should be 00 R
44. ing minimum requirements twisted shielded with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Depending on the application either two conductors Belden 8762 or equivalent or three conductors Belden 8772 or equivalent are required Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Wiring Instructions As shown in Figures 13 and 14 the external demand limit ing signal must be field wired to Chiller 1 The Chiller 1 designation is established by the network address not the physical position of the chiller in the daisy chain See Addressing the Controllers in the Network Commission ing section of this manual for more information The RMS controller is programmed to continuously read the demand limiting signal from Chiller 1 and pass it to the other chill ers via network communications Because there are many different devices that can pro vide an external signal no attempt will be made here to cover every possible application Instead enough informa tion about the MicroTech controller will be presented so that a compatible output device can be selected and wired properly McQuay International is not responsible for MicroTech controller damage that occurs as a result of misapplication of a field supplied device The MCB board in the chiller controller is designed to accept 0 5
45. l Use the following procedure to perform the network wiring 1 Before beginning verify that the port B plug is discon nected from every controller on the communications trunk being wired These plugs will be connected dur ing the commissioning procedure This is a precaution to prevent stray high voltage from damaging the con trollers Any voltage in excess of 12 V can damage the board s communications drivers IM 498 Page 13 Figure 13 Field Wiring Schematic Reciprocating Chillers HARDWARE BY OTHERS 15 VO POWER FUSED LTS AC SUPPLY 15 AMPS NEUTRAL CAUTIO REFER TO BULLETIN CONCERN GROUND CATING CHILLE CATING CHILLE Page 14 IM 498 END FACTORY WIRING FIELD WIRING TERMINAL FIELD WIRING CABLE SHIELDED TWIST JACKETED PAIR WITH PRINTED CIRCUIT BOARD OPTIONAL OPTIONAL CABLE KIT ois ges FTWARE PKG MONITOR SO A UTDOOR R TEMP SENSOR ZONE TEMP SENSOR OPTIONAL S SENSOR KIT _ UNREGULATED INTERNAL E 12 VDC POWER SUPPLY 7 FOR FIELD USE 100 MA MAX LOAD INPUT AG 420 MA EXTERNAL CHILLED WATER RESET GROUND FOR ALL CHILLERS a SEE BULLETIN NO IM 498 4 20 MA pe INPUT A7 E
46. level 2 chiller controllers You can connect the chiller con trollers in any order however it is better to follow the daisy chain as you proceed This will make troubleshooting easier if communications problems occur For the typical net work in which there is no Network Master Panel the RMS Panel is the level 1 controller and the chillers are level 2 controllers As a result of the previous procedure the network communications connector should be disconnected from the B port at every controller on the trunk Be sure that this is true before beginning this procedure 1 Verify that the level 1 controller has a hex switch set ting of 00 See Addressing the Controllers above for more information 2 Plug the level 1 controller s network communications AMP connector into the B port Verify that there is power to the level 1 controller and then go to the first level 2 controller 3 Verify that the controller has the correct level 2 net work address See Addressing the Controllers above for more information Page 22 IM 498 4 With the controllers B port disconnected check for proper communications trunk voltage levels Use a DC voltmeter to test for proper voltages at the network communications field wiring terminal block With one lead on the control panel chassis ground check the voltage at the PT and ground terminals see Table 9 The proper voltages are shown in Table 10 If no voltage or
47. ller each RMS Panel s Comm O K LED should be lit and not blinking proving that network communications exist throughout the chiller plant If the chillers have been commis sioned set up the RMS and chiller controllers as de sired for normal operation Service Information Wiring Diagram The following wiring diagram is identical to the one in the Figure 18 RMS Panel Schematic Legend RMS Panel It is reproduced here for your convenience Sani e 5 e ponent The legend is shown in Figure 18 Designation Description Circuit Breaker Keypad Display Board LED Status Board Microprocessor Control Board Sensor Input Board Transformer 115 24 VAC Transformer 24 VAC 18 VAC CT Terminal Block High Voltage Section Terminal Block Low Voltage Section Factory Wire Number Field Wiring Terminal Field Wiring Printed Circuit Board Terminal Twisted Shielded Pair Cable Figure 19 RMS Panel Schematic Ee m j HARDWARE L BY OTHERS GRD GRD T l l L2 optional software Packace OPTIONAL CABLE KIT NEUTRAL Ta SH l r gt 903 929 A TO RECIP SCREW n 52 J lt CHILLERS 909 DB T PORT B J4 a 115V 24V 905 T A A GC PORTA 4 PORT B 8 BL 24v MJ f COMMUNICATIONS BL
48. lt is 02 The value of this parameter must match the hex switch setting at Chiller 2 If there is only one chiller in the chiller plant set this parameter to NA Chiller 3 Address The RMS controller needs to know the network address of Chiller 3 if any You can set this value at the keypad display with the Chil 3 Addr item under menu 21 Misc Setup default is N A The value of this parameter must match the hex switch setting at Chiller 3 If there are one or two chillers in the chiller plant set this parameter to NA Controller Level The RMS controller needs to know whether it is a level 1 or level 2 controller You can set the controller level at the keypad display with the Level item under menu 21 Misc Setup default is level 1 gt To change the controller level 1 Set the hex switches as required A level 2 controller s hex switch setting cannot be 00 A level 1 controller s hex switch setting must be 00 2 At the keypad display set the Level item to 1 or 2 as required When the ENTER key is pressed the RMS controller will automatically correct its checksums and reset itself It will also change the Total Slaves parameter to 0 see below Total Slaves A level 1 RMS controller needs to know how many level 2 controllers slaves it needs to poll When a level 1 con troller polls one of its level 2 slaves it actively asks the slave if it ha
49. mperature of the water entering the loads depends upon the direction of flow in the decoupler line If the flow rate in the primary circuit is higher than the flow rate in the secondary circuit decoupler arrow to the left in Figure 3 the temperature will be very close to each chillers leaving evaporator water temperature setpoint If the flow rate in the secondary circuit is higher than the flow rate in the primary circuit decoupler arrow to the right in Figure 3 the temperature will be higher than each chiller s leaving evaporator water temperature setpoint because the supply and return water mix Typically the flow rate in the secondary circuit is higher than the flow rate in the primary circuit at part load condi tions for example when one chiller is on Typically the flow rate in the primary circuit is higher than the flow rate in the secondary circuit at full load conditions for example when all chillers are on The primary and secondary flow rates can be equalized if a variable speed secondary pump is used or if multiple sequenced secondary pumps are used but note that the RMS Panel cannot perform these types of secondary pump control Primary Pump Distribution Common Chiller Pump Without Isolation Valves Chiller plant configuration 4 Primary Pump Distribution Common Chiller Pump Without Isolation Valves is shown in Figure 4 The distinguishing characteristics of this con figuration are as follows 1 two or thr
50. nal 13600 Industrial Park Boulevard P O Box 1551 Minneapolis MN 55440 USA 612 553 5330 Printed on recycled paper containing at least 10 post consumer recycled material
51. o the LSB Cycle power to the controller and check the power fuses If both fuses are intact the problem is indetermi nate Obtain factory service If either fuse blows check the LSB board and the connecting ribbon cable for shorts Either one may be defective Figure 20 MCB Power Supply Terminals Troubleshooting Communications Problems If the Comm O K LED on the LSB board is flashing it indicates that a network communications problem exists An alarm message on the keypad display will indicate which chiller s the RMS Panel has lost communications with Troubleshooting this type of problem is limited to the following e Checking the port B voltages e Checking the port B fuses e Checking the network wiring integrity e Checking the network addressing The best way to accomplish these checks is to perform the start up procedures in the Network Commissioning section of this manual If these procedures have been performed and the problem persists obtain factory service Troubleshooting Analog Input Problems The controller receives its analog inputs from the optional Signal Input Board Following are procedures that can be used to isolate analog input problems Refer to the panel wiring diagram or Figure 19 as you proceed Table 11 Thermistor Chart 77 3000 2373 139 761 0 932 78 2927 2343 140 746 0917 79 2857 2313 141 731 0 902 80 2789 2283 142 717 0888 81 2723 2253 143 703 D I 20 13 871 4034 82 2658 2 223
52. ock is used for scheduling Wiring Instructions As shown in Figures 13 and 14 the remote stop switch or external time clock contacts must be field wired to each chiller as required After removing the factory installed jumper connect the switch to input D13 at terminals 140 and 141 on reciprocating chillers and terminals 60 and 61 on screw chillers When the switch is closed 24 VAC is applied to input D13 enabling the chiller When the switch is open input D13 is de energized disabling the chiller If you want both a remote stop switch and an external time clock to control a chiller wire these two devices in series Caution If you are using twisted shielded cable tape back the shield and drain wire on both ends of the cable This will reduce the possibility of shorts PC Connection Regardless of whether the PC is connected directly or remotely via phone lines the connection to any MicroTech controller is at port A on the MCB It is best to connect a PC to the level 1 controller because faster data transmission will result however a PC can be connected to any level 2 controller that does not have level 3 controllers associated with it Either way the PC will have access to the entire network see note below In the typical application the RMS controller is level 1 the chiller controllers are level 2 and there are no level 3 controllers See Network Communications above for more on network architecture It is poss
53. oned with a 250 ohm resis tor This on board resistor is connected between the S signal terminal and G ground terminal of input A6 Note that the G terminal is earth ground see caution above This input arrangement will convert a 4 20 mA signal to a 1 5 VDC signal The maximum allowable volt age at the S terminal is 30 V If desired an unregulated 12 VDC power supply on the chillers MCB board can be used to power the reset signal output device f this power supply is used the total exter nal load cannot exceed 100 mA Reciprocating Chiller Refer to Figure 13 Wire the reset signal to the terminals appropriate for the application In all cases connect the shield to terminal 133 ground and the varying signal to terminal 135 ADI terminal S Connections to terminal 146 12 VDC power supply and terminal 134 ADI terminal G may or may not be re quired For additional information see the unit wiring dia gram and Bulletin No IM 493 MicroTech Reciprocating Chiller Controller Screw Chiller Refer to Figure 14 Wire the reset signal to the terminals appropriate for the application In all cases connect the shield to terminal 47 ground and the varying signal to terminal 45 ADI terminal S Connec tions to terminal 41 12 VDC power supply and terminal 46 ADI terminal G may or may not be required For additional information see the unit wiring diagram and Bulletin No IM 549 M
54. or Controllers About MicroTech Network Architecture All controllers in a MicroTech network are assigned a level level 1 level 2 or level 3 All networks must have one level 1 controller to coordinate communications Mul tiple level 2 controllers can be connected to the level 1 controller with a communications trunk an isolated sec tion of the daisy chained network wiring The network wiring between all controllers shown in Figure 13 is a trunk Multiple level 3 controllers can be connected to a level 2 controller with a separate trunk The maximum allowable length of a communications trunk is 5000 feet For the typical network in which there is one RMS Panel and no Network Master Panel the RMS Panel is the level 1 controller and the chillers are level 2 controllers this is the default factory setup If a Network Master Panel is included in the network it is the level 1 controller and the RMS Panel and the chillers are level 2 controllers Unless there are many water source heat pumps or unit ventilators in the network there usually will not be any level 3 controllers Cable Specification The network communications cable must meet the follow ing minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in th
55. or commissioning the network Further setup will likely be necessary to adapt the RMS controller to your particular application s require ments For complete information on how to do this see the RMS and Chiller Controller Setup section in Bulletin No OM 118 Control Mode Set the RMS Panel s control mode to All Chillers Off This will prevent chillers from being enabled as they are con nected to the network At the RMS controllers keypad display the control mode is the first item under menu 12 Control Mode You can get to it quickly by pressing the CONTROL key After communications have been established between the RMS and chiller controllers the RMS Panel s control mode can be set as desired Number of Chillers The RMS controller needs to know how many chillers will be connected to it You can set this value at the keypad display with the H Chillers item under menu 21 Misc Setup default is 2 Chiller 1 Address The RMS controller needs to know the network address of Chiller 1 You can set this value at the keypad display with the Chil 1 Addr item under menu 21 Misc Setup default is 01 The value of this parameter must match the hex switch setting at Chiller 1 Chiller 2 Address The RMS controller needs to know the network address of Chiller 2 if any You can set this value at the keypad display with the Chil 2 Addr item under menu 21 Misc Setup defau
56. ould have been installed in accordance with the instructions in the Field Wiring section of this manual This procedure will verify 1 that there are no shorts or stray voltages anywhere in the communications trunk and 2 that port B in each con troller is intact It must be performed once at every control ler on the trunk before going on to the following Verifying Communications procedure You can start at any control ler and proceed in any order Before beginning verify that the port B connectors are disconnected from every controller on the trunk On the RMS and chiller controllers the port B connector is an AMP plug 1 Verify that there is no voltage between any conductor and ground Use a voltmeter to test for voltage at the network communications field wiring terminal block With one lead on the control panel chassis ground check for voltage at the and ground terminals Table 9 summarizes the terminal labels for the various control lers There should be no AC or DC voltage If you get a 2 or 3 VDC reading it indicates that one or more powered controllers are connected to the trunk These controllers should be located and disconnected Note The first check should test for voltage throughout the entire trunk however it is important that it be done at every controller Cables look similar and can easily become crossed 2 Verify that there are no shorts between any two conductors
57. outs for 25 Pin Serial Ports Network Commissioning The purpose of network commissioning is to establish and verify communications between the RMS Panel and its associated chillers It is not to establish and verify chiller plant operation Network commissioning can be done independently of the chiller commissioning procedures however if it is done before the chillers are commissioned care should be taken to assure that the chillers do not start The following instructions describe how to do this To commission the network you must be familiar with the operation of the keypad display For information see the Getting Started portion of Bulletin No OM 118 MicroTech Remote Monitoring and Sequencing Panel Before the chiller plant is allowed to operate the chillers must be commissioned in accordance with the instructions in the MicroTech unit controller installation literature and the model specific chiller installation literature see Tables 1 and 2 In addition the RMS Panel and its associated chiller controllers must be set up so that they work properly together This setup which can be done before or after the network is commissioned is described in Bulletin No OM 118 A PC is not required to commission networks that in clude only RMS Panel s and chiller s because communi cations can be verified by observing the RMS Panel s keypad display and LED Status Board However if you want to use a PC to verify network communi
58. pin serial port obtain an adapter The cable length is 12 feet If more length is required a twisted shielded pair cable can be spliced into the kit cable see Cable Specifi cation for Direct PC Connection below If this is done splice the conductors with crimp type butt connectors better or solder best Do not use wire nuts The maximum allowable cable length for direct connec tion between the PC and a controller is 50 feet the de sired length is over 50 feet the MicroTech RS 232 Cable Extension Kit is required This kit can extend the maximum allowable distance between the PC and the controller to 4000 feet The part number is 0065487001 Remote Connection A voice quality direct dial telephone line is required for remote or off site PC access to the network The phone line should be terminated with a standard RJ 11 modular phone plug A modem enables a remote or off site PC to com municate with the networked controllers via phone lines A modem is a standard chiller option but it is not an RMS Panel option However a modem that can be field installed in the RMS Panel or any chiller is available from McQuay International The part number is 0072140601 The kit comes complete with a 14 400 baud modem set up for 9600 baud and a wiring harness If a remote PC connection is required it is recommended that the modem at the MicroTech controller be supplied by McQuay International Installation and wiring instruc
59. quiva lent or three conductors Belden 8772 or equivalent are required Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Wiring Instructions As shown in Figures 13 and 14 the external reset signal must be field wired to Chiller 1 The Chiller 1 designa tion is established by the network address not the physical position of the chiller in the daisy chain See Addressing the Controllers in the Network Commissioning section of this manual for more information The RMS controller is programmed to continuously read the reset signal from Chiller 1 and pass it to the other chillers via network communications Because there are many different devices that can pro vide an external signal no attempt will be made here to cover every possible application Instead enough informa tion about the MicroTech controller will be presented so that a compatible output device can be selected and wired Page 16 IM 498 properly McQuay International is not responsible for MicroTech controller damage that occurs as a result of misapplication of a field supplied device The MCB board in the chiller controller is designed to accept 0 5 VDC analog input signals The chiller s Analog Digital Input ADI board conditions all inputs before they enter the MCB The external reset signal which enters the ADI board at input A6 is conditi
60. re is only one controller connected to the trunk as in this check the measured voltages are for port B on that controller If no voltage or improper voltages are found check the wiring between the port terminals and the field terminals Using Table 10 and Figure 17 verify that the three conductors are properly terminated in the AMP plug Remove and check the two fuses above the B port If there is still a problem it is likely that the communications driver in the MCB is defective 5 Unplug the network communications connector from the B port 6 Go to the next controller and repeat steps 1 through 5 7 After finishing the last controller do the following Verifying Communications procedure Table 9 Network Communications Field Wiring Terminals Network Comm Field Terminal Controller See Eee RMS Panel TB2 B 182 8 TB2 GND Reciprocating Chiller TB7 138 TB7 137 TB7 139 Screw Chiller TB4 54 TB4 53 TB4 55 Table 10 Port B Voltages AMP Type Port B RS 485 Acceptable Voltage Reading 3070 3 VOC 2020 3 VDC 0 02 02 VOC oe IM 498 Page 21 Figure 17 AMP Connector Terminal Configuration Verifying Communications This procedure will verify that proper communications have begun for each controller as it is connected to the network The procedure begins with the level 1 controller because it coordinates network communications After connecting it you should connect any level 2 RMS Panels and then the
61. s any requests for information from other con trollers The Total Slaves parameter defines this number You can set the Total Slaves parameter at the keypad display with the Total Slaves item under menu 21 Misc Setup default is 0 A level 2 RMS Panel s Total Slaves parameter should always be set to 0 In most cases the Total Slaves parameter must be changed only if there is 1 a level 2 RMS Panel or 2 a PC connected to a level 2 controller In the typical chiller plant network which includes one RMS Panel level 1 and no PC the Total Slaves parameter should be set to 0 default If a level 2 controller needs to be polled set the Total Slaves parameter just high enough to include that control ler For example assume there are nine level 2 controllers connected to a level 1 RMS Panel the controller at ad dress 02 is another RMS Panel and the controller at ad dress 06 has a modem connected to it In this case the Total Slaves parameter should be set to 6 Connecting the Communications Trunk Use the following two procedures to connect the RMS controller and chiller controllers to the network You must complete the first procedure before beginning the second Note that if the RMS and chiller controllers were set up as described above the chillers will be disabled when the RMS controller starts communicating with them Communications Cable and Port B Check The network communications cable sh
62. s connected to Chiller 2 for RMS Panel B in the above example you should consider setting the hex switches for RMS Panel B to 01 and the hex switches for its Chiller 2 to 02 See the RMS and Chiller Con troller Setup section in Bulletin No OM 118 for more information Page 20 IM 498 Chiller Controller Setup The chiller controller setup that will result by following these instructions is the minimum required for commis sioning the network Further setup will likely be necessary to adapt the chiller controllers to your particular applica tion s requirements For complete information on how to do this see the RMS and Chiller Controller Setup section in Bulletin No OM 118 Control Mode During this commissioning process it is recommended that the chillers be shut down by setting their control modes to Manual Unit Off At the chiller controller s keypad display the control mode is the first item under menu 13 Control Mode You can get to it quickly by pressing the CONTROL key After communications have been established between the RMS and chiller controllers the chiller control modes can be set as desired see note below Note Until their controllers are set up properly the chillers should be manually shut down so that the RMS Panel cannot enable them RMS Controller Setup The RMS controller setup that will result by following these instructions is the minimum required f
63. sonable protection against harmful interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his or her own expense McQuay International disclaims any liability resulting from any interference or for the correction thereof Applying the RMS Panel The RMS Panel has been designed to control the four most common chiller plant configurations which are as follows 1 Primary Pump Distribution Individual Chiller Pumps 2 Primary Pump Distribution Common Chiller Pump With Isolation Valves 3 Primary Secondary Pump Distribution 4 Primary Pump Distribution Common Chiller Pump Without Isolation Valves Typical schematic representations of these configura tions are shown in Figures 1 through 4 Although the RMS Panel can be used with any of these configurations you should be aware that with configurations 3 and 4 the tem perature of the chilled water being supplied to the load may vary at part load conditions However you can minimize any adverse effects by setting the RMS Panel s sequencing parameters as appropriate for the application For more information see the Sequencing Control section in Bulle tin No OM 118 Following are descriptions of these typical chiller plant configurations and guidelines for applying the RMS Panel in them Note that the McQuay c
64. t which provides voltage to temperature and resistance to temperature conversion data Table 11 is included in the Test Procedures section of this manual Software ID MicroTech RMS controller software is factory installed and tested in each panel prior to shipment The software is identified by a program code also referred to as the Ident which is printed on a small label affixed to the MCB An example of this label is shown in Figure 11 The program code is also encoded in the controllers memory and is available for display on menu 21 of the keypad display or a PC equipped with Monitor software Using menu 21 or Monitor software is the most reliable way of determining the controller s program code RMS controller program codification is as follows At the time of this writing the program code for standard RMS Panel software is RMS U13B If your RMS Panel software has a later revision code for example RMS U13C some of the information in this manual may be inaccurate However since only very minor software changes are considered revisions any inaccuracies should be insignificant Figure 11 Software ID Tag Page 10 IM 498 Software Compatibility Note that RMS U13B is not compatible with some earlier versions of standard MicroTech reciprocating and two compressor screw chiller controller software and it is not compatible with any version of standard three compressor screw chiller controller software The c
65. ter 3 Determine the sensors associated SIB terminals Refer to the panel wiring diagram 4 Remove power from the controller Disconnect the suspect sensor s cable from the SIB field wiring termi nal block and measure the resistance across the con ductors Using the thermistor chart Table 11 com pare this value with the measured temperature If the measured resistance and temperature match go to step 5 If the measured resistance and temperature do not match either there is a wiring problem or the sensor is defective Check the sensor circuit wiring and connec tions for defects 5 Reconnect the sensor cable to the SIB Restore power to the controller and measure the DC voltage across the sensor terminals on the SIB Using the therm istor chart compare this value with the measured temperature If the measured voltage and temperature do not match go to step 6 If the measured voltage and temperature match the MCB is probably defective 6 Measure the DC voltage between terminal 2 on the SIB and chassis ground It should be 5 VDC If the voltage is 5 VDC the SIB board is probably defective If the voltage is not 5 VDC the MCB or the MCB to SIB ribbon cable is probably defective Troubleshooting the LED Status Board The LED Status Board is connected to the MCB via a 26 conductor ribbon cable and discrete wiring for the 12 VDC power The MCB provides operating voltages and control signal outputs for the LEDs
66. tion IBM is a registered trademark of International Business Machines Corporation 1995 McQuay International All rights reserved throughout the world ao OONDARWONM DOONDO Illustrations Figures 1 Primary Pump Distribution Individual Chiller PUMPS sseseeeeeeeeeeeeeeeeeereeeeeene 5 Primary Pump Distribution Common Chiller Pump With Isolation Valves 5 Primary Secondary Pump Distribution 5 Primary Pump Distribution Common Chiller Pump Without Isolation Valves 6 Control Panel Layout 7 Microprocessor Control Board 4 6 8 e e 9 Keypad Display Board KDB 9 LED Status Board LSB 9 Sensor Input Board SIB 10 Software ID Tag 10 RMS Panel Dimensions 12 Field Wiring Schematic Reciprocating Chillers 14 Field Wiring Schematic Screw Chiers 15 RS 232 Cable Pinouts for 9 Pin Serial Ports 19 RS 232 Cable Pinouts for 25 Pin Serial Ports 19 AMP Connector Terminal Configuration 22 RMS Panel Schematic 8080 23 RMS Panel Schematic
67. tions for the MicroTech Modem Kit are included in Bulletin No IM 564 This bulletin is included with the kit Cable Specification for Direct PC Connection A properly terminated twisted shielded pair cable is re quired to directly connect a PC to a MicroTech controller The cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent It must also be properly terminated to an AMP plug on one end and a female DB 9 or DB 25 connector on the other See Figures 15 and 16 for cable pinouts The AMP part numbers for the AMP connector shown in these figures are as follows 1 480270 0 plug and 60617 1 female pin terminals This AMP plug can be connected to an RMS controller a chiller controller or any other MicroTech controller that has the same type of AMP socket The DB 9 or DB 25 connector is for connection to a 9 pin or 25 pin serial port on the PC Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Note A factory assembled cable that meets this speci fication is provided with the PC Communications Cable Kit which is available from McQuay International This cable has a DB 9 connector The part number of the kit is 0057186802 Figure 15 RS 232 Cable Pinouts for 9 Pin Serial Ports Figure 16 RS 232 Cable Pin
68. tribution Common Chiller Pump With Isolation Valves is shown in Figure 2 The distinguishing characteristics of this configu ration are as follows 1 two or three chillers are piped in parallel 2 a common primary chilled water pump serves all chillers 3 the primary pump is also used to distribute water to the cooling loads and 4 each chiller has its own two position isolation valve that is closed when the chiller is off Figure 2 Primary Pump Distribution Common Chiller Pump With Isolation Valves In this system the temperature of the water entering the loads will always be very close to each chillers leaving evaporator water temperature setpoint Caution Significant changes in the chilled water flow rate through the evaporators can result when the chillers in this configuration are turned on and off Large flow rate changes can cause erratic chiller control Primary Secondary Pump Distribution Chiller plant configuration 3 Primary Secondary Pump Distribution is shown in Figure 3 The distinguishing char acteristics of this configuration are as follows 1 two or three chillers are piped in parallel 2 each chiller has its own primary chilled water pump 3 one or more secon dary pumps are used to distribute water to the cooling loads and 4 the secondary circuit is hydraulically isolated from the primary circuit by a decoupler line Figure 3 Primary Secondary Pump Distribution In this system the te
69. ts control parameters alarm messages and schedules With a special keystroke combination the RMS Panel s keypad display can emulate any chillers keypad display The controller includes password protection to pro General Description tect against unauthorized or accidental setpoint or param eter changes The RMS Panel is capable of performing all network communications required for complete stand alone chiller plant control see note below If desired it can be incorpo rated into a MicroTech network that includes a Network Master Panel NMP and other MicroTech controllers In either case an IBM compatible computer containing MicroTech Monitor software can be connected to give you full screen monitoring and control capability The com puter can be connected directly or remotely via telephone lines with an optional modem Note As used throughout this manual the term chiller plant denotes the RMS Panel and its associated chillers it would not include for example a cooling tower system controlled by a MicroTech Application Specific Controller Component Data The control panel layout for the RMS Panel is shown in Figure 5 The main components of the system are the Microprocessor Control Board MCB the Keypad Display Board KDB and the LED Status Board LSB The Sen sor Input Board SIB is an optional accessory that is in cluded with the MicroTech RMS Sensor Kit It is required to connect zone and outdoor
70. urrent software com patibility is summarized in Table 5 The wildcard character x can be any character Table 5 Program Code RMS U13B Software Compatibility Chiller Compatible Incompatible Type Programs ee Reciprocating RCP 01A nne sd AWR 12E AWR 12D and earlier SC2 17C and earlier If you want to use an RMS Panel with older chillers that have incompatible standard software the chiller software must be upgraded If you have a version of chiller software that is later than the compatible programs shown in Table 5 it is likely that program RMS U13B is compatible with it however it may not be To find out for sure contact McQuayService Screw SC2 17D through 171 SC2 180 through 18C none MicroTech Monitoring and Networking Options PC Monitoring A PC personal computer equipped with the appropriate Monitor software can be used to provide a high level interface with a MicroTech network see PC specification below Monitor software features a high resolution graphic display multilevel password access and advanced trend logging The PC can be connected to the RMS controller either directly via a single twisted shielded pair cable or remotely via phone lines with an optional modem For Network Master Panel The MicroTech Network Master Panel NMP allows the RMS controller and its associated chillers to be incorpo rated into a building wide network with other MicroTech unit and auxiliary controllers In

Installation Manual 06/1995

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