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 80 page image

80• Surge/HGBP Deadband controls the amount the ACTIVEDELTA TSAT must drop below the Surge Prevention tode-activate Surge Prevention.Fine Tuning VPF Surge Prevention — Figures 37-40 showhow the parameters defined below will affect the configuredsurge line.NOTE: Before tuning surge prevention check for VFD speedlimitation or capacity overrides. If the source of low capacity isfound in one of these places, do not proceed with an attempt totune the Surge Prevention configurations.If capacity is not reachedand1. ACTUAL GUIDE VANE POSITION < GUIDE VANETRAVEL RANGEand2. SURGE PREVENTION ACTIVE = YESand3. PERCENT LINE CURRENT < 100%then the surge line is probably too conservative.Note the following parameters from ICVC when maximumAVERAGE LINE CURRENT achieved:• EVAPORATOR REFRIGERANT TEMP• EVAPORATOR PRESSURE• CONDENSER REFRIG TEMP• CONDENSER PRESSURE• ACTUAL GUIDE VANE POSITION• AVERAGE LINE CURRENTThe ACTIVE DELTA Tsat and the SURGE LINE DELTATSAT can be monitored on the VPF_STAT screen. WhenDELTA TSAT exceeds SURGE LINE DELTA TSAT surgeprevention will occur.If ACTUAL GUIDE VANE POSITION is less than 30%,then increase SURGE/HGBP DELTA TSMIN in steps of 2º Funtil one of the three conditions listed above no longer applies.Do not change SURGE/HGBP DELTA TSMAX.If ACTUAL GUIDE VANE POSITION is greater than60%, then increase SURGE/HGBP DELTA TSMAX in stepsof 2º F until cooling capacity is reached or one of conditionslisted above no longer applies. Do not change SURGE/HGBPDELTA TSMIN.If ACTUAL GUIDE VANE POSITION is more than 30%AND less than 60%, then:1. Increase SURGE/HGBP DELTA TSMIN in steps of 2º F.2. Increase SURGE/HGBP DELTA TSMAX in steps of2º F.3. Repeat Steps 1 and 2 until one of the conditions listedabove no longer applies.NOTE: DELTA TSMIN should seldom need to be increasedmore than 10 degrees above the selection program value. Like-wise, DELTA TSMAX rarely requires more than a 2 degreeincrease.If surge is encountered then the surge line is probably toooptimistic or high. Note following parameters from ICVC atsurge:• EVAPORATOR REFRIGERANT TEMP• EVAPORATOR PRESSURE• CONDENSER REFRIG TEMP• CONDENSER PRESSURE• ACTUAL GUIDE VANE POSITION• AVERAGE LINE CURRENT05101520253035400 10 20 30 40 50 60 70 80 90 100 110Tsmin=30Tsmin=40Tsmin=50GV_POSDelta TsatFig. 37 — Effect of SURGE/HGBP DELTA TSMINon Surge Preventiona19-19590510152025303540450 10 20 30 40 50 60 70 80 90 100 110Tsmax=60Tsmax=70Tsmax=80GV_POSDelta TsatFig. 38 — Effect of SURGE/HGBP DELTA TSMAXon Surge Preventiona19-19600.005.0010.0015.0020.0025.0030.0035.0040.0045.0050.0055.0060.000 10 20 30 40 50 60 70 80 90 100 110Shape factor= -0.020Shape factor= -0.040Shape factor= -0.050GV_POSDelta TsatFig. 39 — Effect of SURGE LINE SHAPE FACTORon Surge Preventiona19-1961