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

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Carrier AquaEdge 19DV series Start-up, Operation And Maintenance Instructions Manual Manual pdf 35 page image

35Fig. 33 — Effect of SURGE DELTA TSMAX onSurge PreventionFig. 34 — Effect of SURGE LINE SHAPE FACTORon Surge PreventionFig. 35 — Effect of SURGE LINE SPEED FACTORon Surge PreventionIf 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 DELTA TSMIN in 1°F steps up to 5 times.Monitor chiller for surge.2. If ACTUAL GUIDE VANE POSITION is still less than30% and Step 1 failed, increase the value of SURGELINE SHAPE FACTOR in steps of 0.01 up to 2 times.For example, if surge is encountered when shape factoris –0.06, increase the SURGE LINE SHAPE FACTORto –0.05. If this does not solve the problem, go to Step 5,even if ACTUAL GUIDE VANE POSITION is lessthan 30%.3. Do not change SURGE LINE SHAPE FACTOR fromthe value selected by Chiller Builder (ECAT). DecreaseSURGE DELTA TSMAX by 1°F steps up to 5 times.Monitor chiller for surge.4. If ACTUAL GUIDE VANE POSITION is greater than60% and Step 3 failed to eliminate surge, then setSURGE DELTA TSMAX to 5°F below the value speci-fied by Chiller Builder (ECAT). Increase the value of theSURGE LINE SHAPE FACTOR in steps of 0.01 up to 2times. For example, if surge is encountered when theSURGE LINE SHAPE FACTOR is –0.06, increase theSURGE LINE SHAPE FACTOR to –0.05. If this doesnot solve the problem, go to Step 5, even if ACTUALGUIDE 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 DELTATSMIN and SURGE DELTA TSMAX to the value spec-ified by Chiller Builder (ECAT). Decrease SURGE DEL-TA TSMIN and SURGE DELTA TSMAX in steps of 1°Fup to 5 times. Monitor chiller for surge.If the drive does not slow down adequately at part load, thenthe machine may be operating at a point above the configured“software” surge line and the machine is in surge preventionmode. Check for a surge protection message on the HMI. If theunit is not in a surge protection state, then the ENVELOPESPEED FACTOR may need to be increased (more aggressivesurge line protection) in combination with a decrease in theSURGE LINE SHAPE FACTOR.OPERATING INSTRUCTIONSOperator Duties1. Become familiar with the chiller and related equipmentbefore operating the chiller.2. Prepare the system for start-up, start and stop the chiller,and place the system in a shutdown condition.3. Maintain a log of operating conditions and document anyabnormal readings.4. Inspect the equipment, make routine adjustments, andperform a Control Test. Maintain the proper refrigerantlevels.5. Protect the system from damage during shutdown periods.6. Maintain the set point, time schedules, and other PICfunctions.Prepare the Chiller for Start-Up — Follow the stepsdescribed in the Initial Start-Up section, page 33.To Start the Chiller1. Start the water pumps, if they are not automatic.2. Press the Start/Stop icon on the HMI home screen to startthe system. If the chiller is in the OCCUPIED mode andthe start timers have expired, the start sequence will start.Follow the procedure described in the Start-Up/Shut-down/Recycle Sequence section, page 12.a19-19600510152025303540450 10 20 30 40 50 60 70 80 90 100 110Tsmax=60Tsmax=70Tsmax=80GV_POSDelta Tsata19-19610.005.0010.0015.0020.0025.0030.0035.0040.0045.0050.0055.0060.000 10 20 30 40 50 60 70 80 90 100 110Shape factor= -0.020Shape factor= -0.040Shape factor= -0.050GV_POSDelta Tsata19-19620.005.0010.0015.0020.0025.0030.0035.0040.000 10 20 30 40 50 60 70 80 90 100 110Speed Factor=1.60Speed Factor=1.85Speed Factor=2.00GV_POSDelta Tsat