Carrier 17DA Start-up, Operation And Maintenance Instructions Manual

Also see for 17DA: Start-up instructions Application data Operating and maintenance instructions Start-up instructions

7The proportional band can be adjusted on the PLC to sta-bilize the level if necessary.3. Start the compressor. Observe the machine's operation for15 to 20 minutes before increasing the load. During thisperiod, make the following checks and adjustments:a. Check oil pressure.b. Adjust water flow thru oil cooler so that bearingtemperatures stay between 150 and 170 F (65 and77 C) approximately.c. Watch bearing temperatures carefully. This is thefirst time that the machine has been run underrefrigeration load. Bearing temperatures may leveloff at some temperature slightly higher than 170 F(77 C) listed above. This may be the normal stablecondition for this bearing. High thrust bearing tem-perature will shut the machine down at 180 F(82 C).d. Watch the discharge temperature and if the temper-ature climbs past 150 F (65.5 C), open the guidevanes in small steps of 5% or less until the dis-charge temperature starts to decrease.4. Slowly open the guide vanes, by manual control, thus in-creasing the load. Do not exceed the current rating of theelectric motor. Watch for other signs of overloading a tur-bine or engine drive.5. Add liquid refrigerant, trimming the charge off at thepoint where the machine reaches design operating tem-perature and pressure conditions.6. Shut the machine off. When the refrigerant level settlesdown, mark this optimum level on the sight glass. Main-tain this shutdown level.7. To determine the approximate refrigerant charge for themachine, add the cooler charge to the applicable condens-er charge as listed in Tables 3A and 3B.Hot Alignment Check and Doweling — After themachine has been running at about full load for 4 hours, itscomponents will have come up to steady state operating tem-perature conditions and the final hot alignment check may bemade.Realign component locations until angular and parallelalignments are within coupling manufacturer's specified toler-ances.Dowel all equipment into place as soon as the hot alignmentcheck proves that the machine is within these running toleranc-es. See Carrier Standard Service Techniques, Form SM-15,Rev A, for these operations.Operational Testing — When the chiller is in opera-tion, and it is time to set the flows and confirm that the machineis operating according to design conditions, a heat balancemust be determined. In brief, a heat balance is the sum of theenergy being absorbed by the cooler plus the energy suppliedthrough the driver (turbine, motor) compared with the energybeing discharged through the condenser.Cooler Tons + Motor Tons = Condenser TonsWhen these two items are equal it is certain that the readingsand measurements are accurate. The motor kW must be cor-rected for motor efficiency and gear losses must be subtractedfrom motor kW to get actual compressor input horsepower.Motor kW is converted to equivalent tons by this formula:Tons = kW / 3.515Cooler and condenser tons: (for fresh water, specific heat[sp ht] = 1 and specific gravity [sp gr] = 1)Tons = (gpm * T * sp ht * sp gr) / 24A perfect heat balance is 0, but this is practically impossibleto achieve. With laboratory quality instrumentation, less than a2% heat balance at full load conditions should be achievable.Greater than 5% should be regarded as very inaccurate and re-quires further investigation of the start-up conditions.Instruct Customer Operator — Ensure the opera-tor(s) understand all operating and maintenance procedures.Point out the various chiller parts and explain their function aspart of the complete system.CONTROL PANEL1. Internal safeties2. Communication with chiller controls3. Starter operational sequence4. Current and voltage monitor operationVFD1. Detailed description of component, section, purpose, andoperation2. Control section processor and access to screens3. Procedures to switch from bypass to VFD operation (ifbypass equipped)Table 3A — Typical 17DA Cooler and Condenser Charges (R-134a) (lb)CAUTIONExcessive overcharge may cause liquid refrigerant carry-over into the compressor, causing severe overload and pos-sible compressor damage.COOLERSIZE 15-FT TUBES 18-FT TUBES 22-FT TUBES CONDENSERSIZE 15-FT TUBES 18-FT TUBES 22-FT TUBES61 3,000 3,600 4,400 61 2,000 2,400 2,90063 3,600 4,300 5,300 63 2,000 2,400 2,90065 3,600 4,300 5,300 65 2,500 3,000 3,60067 4,200 5,100 6,200 67 2,500 3,000 3,60071 4,600 5,500 6,800 71 2,600 3,100 3,80073 5,000 5,900 7,300 73 2,600 3,100 3,80075 5,600 6,600 8,100 75 3,100 3,700 4,50081 6,500 7,700 9,500 81 3,500 4,100 5,00082 7,700 9,300 11,300 83 4,000 4,700 5,80083 6,900 8,300 10,200 85 4,600 5,400 6,70084 8,200 9,900 12,200 87 4,500 5,300 6,50085 7,700 9,200 11,30086 10,200 12,300 15,20087 8,600 10,400 12,60088 11,000 13,500 16,50090 13,000 15,600 19,200