Controls, Start-Up, Operation, Service And Troubleshooting - Carrier

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Table 28 — 4 to 20 mA Temperature Reset ConfigurationMODE KEYPAD ENTRY DISPLAY ITEM EXPANSION COMMENTCONFIGURATIONENTERDISPUNITSERVOPTNENTERRSETCRSTReset Cool and Heat TmpCooling Reset TypeENTERENTER0 No Reset0 No Reset Flashing to indicate Edit mode. May require Password/ 3 4-20 mA Input Use up or down arrows to change value to 3.ENTERESCAPEESCAPE3 Accepts the change.CRSTAt mode levelSETPOINTS / Change to Setpoints ModeENTERCOOLCooling SetpointsENTERCSP.1 Cooling Setpoint 1x 2 CSP.3 Cooling Setpoint 3ENTERENTERCRV1 Current No Reset Val Outdoor Temperature where no temperature reset isrequired.0 Value of CRV10 Flashing to indicate Edit mode4.0 Value of No Temperature Reset, 4 from the example.ENTERESCAPEENTERENTER4.0 Accepts the change.CRV1CRV2 Current Full Reset Val Current value where full temperature reset, DGRC isrequired.0 Value of CRV2.0 Flashing to indicate Edit mode20.0 Value of full Temperature Reset, 20 from the example.ENTERESCAPE20.0 Accepts the change.CRV2x 6CRS2DGRC Degrees Cool Reset Amount of temperature reset required.ENTERENTERENTERESCAPE0 Value of DGRC0 Flashing to indicate Edit mode5.0 Amount of Temperature Reset required, 5 from theexample.5.0 Accepts the change.DGRCNOTE: Bold values indicate sub-mode level.40
Demand Limit — Demand limit is a feature that allowsthe unit capacity to be limited during periods of peak energyusage. There are three types of demand limiting that canbe configured. The first type is through 2-step switchcontrol, which will reduce the maximum capacity to 2 userconfigurablepercentages. The second type is by 4 to 20 mAsignal input which will reduce the maximum capacity linearlybetween 100% at a 4 mA input signal (no reduction) down tothe user-configurable level at a 20 mA input signal. The thirdtype uses the CCN Loadshed module and has the ability tolimit the current operating capacity to maximum and furtherreduce the capacity if required.NOTE: One-step Demand Limit is standard.The 2-step switch control and 4 to 20-mA input signal typesof demand limiting require the energy management module(EMM).To use demand limit, select the type of demand limiting touse. Then configure the demand limit set points based on thetype selected.2-STEP SWITCH CONTROLLED — If using 2-step demandlimit control, an energy management module must be installed.One-step demand limit control does not require the energymanagement module. To configure demand limit for2-step switch control, three parameters must be configured:Demand Limit Select (Configuration→RSET→DMDC),Switch Limit Setpoint 1 (Setpoints→MISC→DLS1) andSwitch Limit Setpoint 2 (Setpoints→MISC→DLS2). In thefollowing example, Demand Limit Switch 1 is 60% and demandlimit Switch 2 is 40%. Demand limit steps are controlledby two relay switch inputs field wired to TB5 for Switch 1 andTB6 for Switch 2. See Table 29.For demand limit by 2-stage switch control, closing the firststage demand limit contact will put the unit on the first demandlimit level. The unit will not exceed the percentage of capacityentered as Demand Limit Switch 1 set point. Closing contactson the second demand limit switch prevents the unit from exceedingthe capacity entered as Demand Limit Switch 2 setpoint. The demand limit stage that is set to the lowest demandtakes priority if both demand limit inputs are closed. If the demandlimit percentage does not match unit staging, the unitwill limit capacity to the closest capacity stage without exceedingthe value. To disable demand limit configure DMDC to 0.EXTERNALLY POWERED (4 to 20 mA Controlled) — Theenergy management module is required for 4 to 20 mAdemand limit control. To configure demand limit for 4 to20 mA control three parameters must be configured. They are:Demand Limit Select (Configuration→RSET→DMDC), mAfor 100% Demand Limit (Configuration→RSET→DMMX)and mA for 0% Demand Limit (Configuration→RSET→DMZE). In the following example, a 4 mA signal is DemandLimit 100% and a 20 mA Demand Limit signal is 0%. The 4 to20 mA signal is connected to TB6-1 and TB6-2. The demandlimit is a linear interpolation between the two values entered.See Table 30 and Fig. 23.Care should be taken when interfacing with other controlsystems due to possible power supply differences such as afull wave bridge versus a half wave rectification. Connectionof control devices with different power supplies mayresult in permanent damage. ComfortLink controlsincorporate power supplies with half wave rectification. Asignal isolation device should be utilized if the signal generatorincorporates a full wave bridge rectifier.In Fig. 23, if the machine receives a 12 mA signal, themachine controls will limit the capacity to 50%.CCN LOADSHED CONTROLLED — To configure demandlimit for CCN Loadshed control, the unit Operating TypeControl must be in CCN control, (Operating Modes→SLCT→SP.SE=2) and be controlled by a Chillervisor module.The Chillervisor module can force the demand limit variableand directly control the capacity of the machine. Additionally,the unit’s set point will be artificially lowered to force the chillerto load to the demand limit value.Remote Alarm and Alert Relays — The 30RB chillercan be equipped with a remote alert and remote alarmannunciator contacts. Both relays connected to these contactsmust be rated for a maximum power draw of 10 va sealed,25 va Inrush at 24 volts. The alarm relay, indicating that thecomplete unit has been shut down can be connected to TB5-12and TB5-13. For an alert relay, indicating that at least 1 circuitwas off due to the alert, a field-supplied and installed relaymust be connected between MBB-J3-CH25-3 and TB5-13.41
Page 2 and 3: CONTENTS (cont)Page• COOLER LEAVI
Page 4 and 5: Table 2 — Main Base Board Inputs
Page 6 and 7: Table 3 — Scroll Protection Modul
Page 8 and 9: Table 4 — EXV1 Board Inputs and O
Page 10 and 11: Table 6 — Fan Board 1 (AUX1, AUX2
Page 12 and 13: Table 8 — Fan Board 3 (AUX1) Inpu
Page 14 and 15: SIO LENSIO LEN+ G - + G -2212212212
Page 16 and 17: Table 10 — ComfortLink Display Me
Page 18 and 19: Table 12 — Configuring the Master
Page 20 and 21: Capacity Control — The control sy
Page 22 and 23: STAGETOTALCAP.LEGENDMLC — Minimum
Page 24 and 25: If any of these conditions are met,
Page 26 and 27: Table 19 — Head Pressure Control
Page 28 and 29: Table 20 — Low Ambient Temperatur
Page 30 and 31: LEGENDI 2 t — Current Squared Tim
Page 32 and 33: Control Method(OPER)0(Switch Ctrl)1
Page 34 and 35: Temperature Reset — Temperature r
Page 36 and 37: 5654FLUID TEMPERATURE (deg F)525048
Page 38 and 39: To use 4-20 mA Temperature Reset in
Page 42 and 43: Table 29 — 2-Step Demand Limit Co
Page 44 and 45: PRE-START-UPIMPORTANT: Complete the
Page 46 and 47: Operation below minimum flow rate c
Page 48 and 49: MODE 12 (MD12) — Auto Changeover
Page 50 and 51: 1. Cable2. Glass Seal3. Motor Housi
Page 52 and 53: DISASSEMBLYClosedOpenNOTE: Open val
Page 54 and 55: 1130 26 2218 137 16 9 20243 5 28343
Page 56 and 57: Charging with Unit Off and Evacuate
Page 58 and 59: Table 37 — TroubleshootingSYMPTOM
Page 60 and 61: PREFIXCODECoCtFCMCSUFFIXCODE.F1.F2.
Page 62 and 63: Table 38 — Alarm Codes (cont)PREF
Page 64 and 65: Possible Causes — If this conditi
Page 66 and 67: a control option that requires the
Page 68 and 69: interlock (PMPI) contacts. The pump
Page 70 and 71: Suction Transducer FailurePr.04 —
Page 72 and 73: NOTE: The energy management module
Page 74 and 75: Table 43B — 5K Thermistor Tempera
Page 76 and 77: ALM RALT RCL-HTCWFSDLSVDPTEXVEMMFIO
Page 78 and 79: COMPRESSOR AND FAN LOCATIONFig. 37
Page 80 and 81: COMPRESSOR AND FAN LOCATIONFig. 39
Page 82 and 83: APPENDIX A — LOCAL DISPLAY TABLES
Page 90 and 91:
APPENDIX A — LOCAL DISPLAY TABLES
Page 92 and 93:
NOTE: See operating modes starting
Page 94 and 95:
APPENDIX B — CCN TABLES (cont)STA
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
NOTES:1. Compressor capacity will b
Page 102 and 103:
APPENDIX B — CCN TABLES (cont)SET
Page 104 and 105:
APPENDIX B — CCN TABLES (cont)MAI
Page 106 and 107:
APPENDIX B — CCN TABLES (cont)SER
Page 108 and 109:
APPENDIX C — CCN ALARM DESCRIPTIO
Page 110 and 111:
APPENDIX C — CCN ALARM DESCRIPTIO
Page 112 and 113:
Actual start-up 44Alarms and alerts
Page 114 and 115:
Copyright 2007 Carrier CorporationM
Page 116 and 117:
7. Electrical circuit protection ha
Page 118 and 119:
Record Configuration InformationMOD
Page 120 and 121:
Component Test — Complete the fol
Page 122 and 123:
Operating Data:Record the following
Page 124:
Copyright 2007 Carrier CorporationM
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Controls, Start-Up, Operation, Service And Troubleshooting - Carrier

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