Carrier 60 Installation And Service Instructions Manual

Also see for 60: Manual Service manual

Contents

Carrier 60 Installation And Service Instructions Manual Manual pdf 27 page image

Check Oil Charge — The compressor(s) is factory-charged with oil. If oil is visible in the compressor sightglass(es), check the unit for operating readiness as describedin Initial Check section (page 25), then start the unit. Ob-serve oil level and add oil, if required, to bring the oil levelin the compressor crankcase(s) to between 1 ⁄8 and 3 ⁄8 of thesight glass(es) during steady operation.TO ADD OIL1. Close the suction shutoff valve and pump the compressorcrankcase down to between zero and 2 psig (zero to13.8 kPa) (the low-pressure switch must be jumpered).Wait a few minutes and repeat as needed until the pres-sure remains between zero and 2 psig (zero to 13.8 kPa).2. Close the discharge shutoff valve.3. Remove the oil-fill plug above the compressor sight glass,add oil through the plug hole, and replace the plug.4. After opening the suction and discharge service valves,remove low-pressure switch jumper, run the compressorfor about 20 minutes, and check the oil level.Use only Carrier-approved compressor oil:Petroleum Specialties, Inc. . . . . . . . . . . . . . . . .Cryol 150*Texaco, Inc. . . . . . . . . . . . . . . . . . . . . . . . . .Capella WF-32Witco Chemical Co. . . . . . . . . . . . . . . . . . . . . .Suniso 3GS*Factory charge.Do not reuse drained oil, and do not use any oil that hasbeen exposed to the atmosphere.TO REMOVE OILThe crankcase will be under slight pressure. Be carefulnot to lose the entire oil charge. Gloves and eye pro-tection must be worn.Pump down the compressor to between zero and 2 psig(zero to 13.8 kPa). Loosen the oil drain valve located in thecompressor base to allow the oil to seep out past plug threads.Be careful not to remove plug; the entire oil charge may belost. Small amounts of oil can be removed through oil pumpdischarge connection.START-UP AND OPERATIONOperation Checks — Start-up should be performed onlyunder supervision of an experienced refrigeration techni-cian. Refer to Start-Up Checklist on pages CL-1 to CL-4.Remove and save the checklist for future reference.1. Crankcase heater must be energized for at least 24 hoursbefore the chiller is started.2. Open all system valves that may have been closed duringor after charging.3. Check air-handling equipment, chilled water (fluid) andcondenser pumps, and any other equipment connected tothe chiller.4. Start the unit by moving the ON-OFF switch to the ONposition.5. Check all controls for proper operation. Follow Start-UpChecklist procedures in these instructions.6. Adjust the water regulating valve (where used) to obtainthe most economical head pressure (based on the relativecost of water and electricity). Head pressure is normally200 to 230 psig (1379 to 1586 kPa) for 30HK,HL units,and 195 to 226 psig (1344 to 1558 kPa) for 30HW unitswhen using R-22 refrigerant.7. Check the cooler leaving chilled water temperature to seethat it remains well above 32 F (0° C), or the brine freez-ing point if the unit is a medium temperature brine unit.8. Recheck compressor oil level (see Check Oil Charge sec-tion on this page). Add or remove oil to achieve the levelrequired during steady operation.Operating LimitationsDo not operate with cooler leaving chiller water (fluid)temperature (LCWT) below 40 F (4.5 C) for the stan-dard units, or below 15 F (−9.4 C) for units factory builtfor medium temperature brine.HIGH COOLER LEAVING CHILLED WATER (FLUID)TEMPERATURES (LCWT) — During start-up with coolerLCWT above approximately 60 F (16 C), the unit expansionvalve will limit suction pressure to approximately 90 psig(620 kPa) to avoid overloading the compressor.LOW COOLER LCWT — For standard units, the LCWTmust be no lower than 40 F (4.5 C). If the unit is the factory-installed optional medium temperature brine unit, the coolerLCWT can go down to 15 F (−9.4 C).MAIN POWER SUPPLY — Minimum and maximum ac-ceptable supply voltages are listed in Tables 4A and 4B.Unbalanced 3-Phase Supply Voltage — Never operate a mo-tor where a phase imbalance between phases is greater than2%. To determine percent voltage imbalance, see Unbal-anced 3-Phase Supply Voltage section on page 19.Check Refrigerant Feed ComponentsTHERMOSTATIC EXPANSION VALVE (TXV) — The TXVcontrols the flow of liquid refrigerant to the cooler by main-taining constant superheat of vapor leaving the cooler. Thereis one valve per refrigerant circuit. The valve(s) is activatedby a temperature-sensing bulb(s) strapped to the suction line(s).The valve(s) is factory-set to maintain between 8° and10° F (4.4° and 5.6° C) of superheat leaving the cooler. Checkthe superheat during operation after conditions have stabi-lized. If necessary, adjust the superheat to prevent refriger-ant floodback to the compressor.FILTER DRIER — The function of the filter drier is to main-tain a clean, dry system. The moisture indicator (describedbelow) indicates any need to change the filter drier. The fil-ter drier is a sealed-type drier. When the drier needs to bechanged, the entire filter drier must be replaced.NOTE: The 30HK, HL units have 2 filter driers; one percircuit.MOISTURE-LIQUID INDICATOR — The indicator is lo-cated immediately ahead of the TXV to provide an indica-tion of the refrigerant moisture content. It also provides asight glass for refrigerant liquid. Clear flow of liquid refrig-erant (at full unit loading) indicates sufficient charge in thesystem. Bubbles in the sight glass (at full unit loading) in-dicate an undercharged system or the presence of noncon-densables. Moisture in the system, measured in parts per million(ppm), changes the color of the indicator as follows:Blue (safe) — Moisture is below 45 ppmLight Violet (caution) — 45 to 180 ppmPink (wet) — above 180 ppmThe unit must be in operation at least 12 hours before themoisture indicator gives an accurate reading, and must be incontact with liquid refrigerant. At the first sign of moisturein the system, change the corresponding filter drier.NOTE: The 30HK, HL units have 2 indicators; one percircuit.LIQUID LINE SERVICE VALVE — This valve provides arefrigerant charging port and, in combination with the com-pressor discharge service valve(s), allows the refrigerant tobe pumped into the high side of the system.27