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

Contents

35CALC REF DELTA TSAT + ENVELOPE LINE OFFSET surgeprevention will occur.If ACTUAL GUIDE VANE POSITION is less than 30%, then in-crease SURGE DELTA TSMIN in steps of 2ºF (1.2ºC) until oneof the three conditions listed above no longer applies. Do notchange SURGE DELTA TSMAX.If ACTUAL GUIDE VANE POSITION is greater than 60%, thenincrease SURGE DELTA TSMAX in steps of 2ºF (1.2ºC) untilcooling capacity is reached or one of conditions listed above nolonger applies. Do not change SURGE/HGBP DELTA TSMIN.If ACTUAL GUIDE VANE POSITION is more than 30% ANDless than 60%, then:1. Increase SURGE DELTA TSMIN in steps of 2ºF (1.2ºC).Alternatively if Pressure Ratio Method is used for surgeprotection increase PR at Minimum Opening.2. Increase SURGE DELTA TSMAX in steps of 2ºF (1.2ºC).Alternatively if Pressure Ratio Method is used for surgeprotection increase PR at Full Load Opening.3. Repeat Steps 1 and 2 until one of the conditions listedabove no longer applies.NOTE: DELTA TSMIN should seldom need to be increased morethan 10 degrees above the selection program value. Likewise,DELTA TSMAX rarely requires more than a 2ºF (1.2ºC) increase.If surge is encountered then the controls surge prevention algo-rithm surge line is probably too optimistic or high. Note followingparameters from HMI at surge:• EVAPORATOR REFRIGERANT TEMP• EVAPORATOR PRESSURE• CONDENSER REFRIG TEMP• CONDENSER PRESSURE• ACTUAL GUIDE VANE POSITION• AVERAGE LINE CURRENTFig. 36 — Effect of SURGE DELTA TSMIN onSurge PreventionFig. 37 — Effect of SURGE DELTA TSMAX onSurge PreventionFig. 38 — Effect of SURGE LINE SHAPE FACTOR onSurge PreventionFig. 39 — Effect of SURGE LINE SPEED FACTOR onSurge PreventionIf ACTUAL GUIDE VANE POSITION is less than 30%, go toStep 1. If ACTUAL GUIDE VANE POSITION is greater than60%, then go to Step 3.1. Do not change SURGE LINE SHAPE FACTOR from thevalue selected by Chiller Builder (ECAT). DecreaseSURGE DELTA TSMIN or PR at Minimum Opening.Monitor chiller for surge.2. If ACTUAL GUIDE VANE POSITION is still less than30% and Step 1 failed, increase the value of SURGE LINEa19-195905101520253035400 10 20 30 40 50 60 70 80 90 100 110Tsmin=30Tsmin=40Tsmin=50GV_POSDelta Tsata19-19600510152025303540450 10 20 30 40 50 60 70 80 90 100 110Tsmax=60Tsmax=70Tsmax=80GV_POSDelta Tsat0.005.0010.0015.0020.0025.0030.0035.0040.0045.0050.0055.0060.000 10 20 30 40 50 60 70 80 90 100 110Shape factor= -0.020Shape factor= -0.040Shape factor= -0.050GV_POSDelta Tsata19-196205101520253035400 10 20 30 40 50 60 70 80 90 100 110Speed Factor=1.60Speed Factor=1.85Speed Factor=2.00GV_POSDelta Tsat