Carrier AquaEdge 19XR series Start-up, Operation And Maintenance Instructions Manual

Also see for AquaEdge 19XR series: Installation instructions Start-up, operation and maintenance instructions

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Carrier AquaEdge 19XR series Start-up, Operation And Maintenance Instructions Manual Manual pdf 81 page image

81If ACTUAL GUIDE VANE POSITION is less than 30%,go to Step 1. If ACTUAL GUIDE VANE POSITION is greaterthan 60%, then go to Step 3.1. Do not change SURGE LINE SHAPE FACTOR fromthe value selected by Chiller Builder (ECAT). DecreaseSURGE/HGBP DELTA TSMIN in 1° F steps up to 5times. Monitor chiller for surge.2. If ACTUAL GUIDE VANE POSITION is still less than30 and step 1 failed, then increase the value of SURGELINE SHAPE FACTOR in steps of 0.01 up to 2 times.For example, if surge is encountered when shape factor is–0.06, increase the SURGE LINE SHAPE FACTOR to–0.05. If this does not solve the problem, go to step 5,even if ACTUAL GUIDE VANE POSITION is less than30%.3. Do not change SURGE LINE SHAPE FACTOR fromthe value selected by Chiller Builder (ECAT). DecreaseSURGE/HGBP DELTA TSMAX by 1° F Steps up to 5times. Monitor chiller for surge.4. If ACTUAL GUIDE VANE POSITION is greater than60% and Step 4 failed to eliminate surge, then setSURGE/HGBP DELTA TSMAX to 5° F below the valuespecified by Chiller Builder (ECAT). Increase the valueof the SURGE LINE SHAPE FACTOR in steps of 0.01up to 2 times. For example, if surge is encountered whenthe SURGE LINE SHAPE FACTOR is –0.06, increasethe SURGE LINE SHAPE FACTOR to –0.05. If thisdoes not solve the problem, go to Step 5, even if ACTU-AL GUIDE VANE POSITION is greater than 60%.5. If ACTUAL GUIDE VANE POSITION is greater than30% but less than 60% or if Step 2 failed (with ACTUALGUIDE VANE POSITION less than 30) or if Step 4failed (with ACTUAL GUIDE VANE POSITION great-er than 60), then perform this step. Do not changeSURGE LINE SHAPE FACTOR from the value speci-fied by Chiller Builder (ECAT). Reset SURGE/HGBPDELTA TSMIN and SURGE/HGBP DELTA TSMAX tothe value specified by Chiller Builder (ECAT). DecreaseSURGE/HGBP DELTA TSMIN and SURGE/HGBPDELTA TSMAX in steps of 1° F up to 5 times. Monitorchiller for surge.CONFIGURE DIFFUSER CONTROL IF NECES-SARY — If the compressor is equipped with a variablediffuser, (size 4 or 5 compressor) access the VDO_SRDscreen. Scroll to DIFFUSER CONTROL and press thesoftkey. Compare the diffuser and guide vanevalues (GUIDE VANE 25% LOAD PT, GUIDE VANE 50%LOAD PT, GUIDE VANE 75% LOAD PT, DIFFUSER 25%LOAD POINT, DIFFUSER 50% LOAD POINT, DIFFUSER75% LOAD POINT) to the values located on the label insidethe control panel above the ICVC. See Fig. 13.Compressors with variable diffuser control have actuatorstested and stamped with the milliamp (mA) value that results in100% actuator rotation. In addition to the diffuser positionschedule, the DIFFUSER FULL SPAN mA of the split ringdiffuser actuator must be entered in the SETUP2 screen. Thisinformation is printed on a label affixed under the solid-statecontroller box on the right side of the split ring diffuser actuatorwhen viewing the compressor from the suction end.Units with VFD — On units with VFD further adjustments canbe made if response to surge prevention or protection is notfunctioning as desired. VFD GAIN and VFD INCREASE STEPcan be adjusted to allow for more aggressive changes in speedwhen surge prevention or protection is active.MODIFY EQUIPMENT CONFIGURATION IF NECES-SARY — The EQUIPMENT SERVICE table has screens toselect, view, or modify parameters. Carrier’s certified drawingshave the configuration values required for the jobsite. Modifythese values only if requested.EQUIPMENT SERVICE Screen Modifications — Changethe values on these screens according to specific job data. Seethe certified drawings for the correct values. Modifications caninclude:• Chilled water reset• Entering chilled water control (Enable/Disable)• 4 to 20 mA demand limit• Auto restart option (Enable/Disable)• Remote contact option (Enable/Disable)See PIC II System Functions (page 43) for description ofthese functions.Owner-Modified CCN Tables — The following EQUIP-MENT CONFIGURATION screens are described for refer-ence only.OCCDEFCS — The OCCDEFCS screen contains the Localand CCN time schedules, which can be modified here or on theSCHEDULE screen as described previously.HOLIDAYS — From the HOLIDAYS screen, the days of theyear that holidays are in effect can be configured. See the holi-day paragraphs in the Controls section for more details.BRODEF — The BRODEF screen defines the start and end ofdaylight savings time. By default this feature is enabled. Enterthe dates for the start and end of daylight savings if requiredfor your location. Note that for Day of Week, 1 representsMonday. Start Week and Stop Week refer to the instance of theselected Day of Week during the selected month and year. Todisable the feature, change START ADVANCE and STOPBACK times to 0 (minutes). In the BRODEF table the usermay also identify a chiller as the time broadcaster for a CCNnetwork. There should be only one device on a CCN networkwhich is designated as the Time Broadcaster.ALARM ROUTING — This is in the table SERVICE–>EQUIPMENT CONFIGURATION–>NET_OPT under theheading Alarm Configuration. ALARM ROUTING consistsof an 8-bit binary number. Only bits 1, 2, and 4 (countingfrom the left, first) are used. The others do not matter. The bitscan be set by any device which can access and change configu-ration tables. If any of these 3 bits is set to 1, the controller(ICVC, for example) will broadcast any alarms which occur.• first bit = 1 indicates that the alarm should be read and pro-cessed by a “front end” device, such as a Comfort-WORKS® device.• second bit = 1 indicates that the alarm should be read andprocessed by a TeLINK™ or Autodial Gateway module.0.005.0010.0015.0020.0025.0030.0035.0040.000 10 20 30 40 50 60 70 80 90 100 110Speed Factor=1.60Speed Factor=1.85Speed Factor=2.00GV_POSDelta TsatFig. 40 — Effect of SURGE LINE SPEED FACTORon Surge Preventiona19-1962ENABLE