Évaluations - 4, GPA: 4 ( )

Fabricant : Carrier Taille : 1.45 mb Nom Fichier : Langue d'enseignement:

Never charge liquid into the low-pressure side of the system. 1. Frontseat (close) condenser liquid line shutoff valve. 2. Connect a refrigerant cylinder loosely to the charging valve connection of the liquid line shutoff valve. Purge the charging hose and tighten the connections. 3. Open the charging valve. 4. If the system has been dehydrated and is under vacuum, break the vacuum with refrigerant gas. For R-22, build up system pressure to 58 psig and 32 F (400 kPa and 0° C). Invert the refrigerant cylinder so that the liquid refrigerant will be charged. 5. a. For complete charge of 30HK, HWB, HWC, and HWS units, follow charging by weight procedure. When charge is nearly full, complete the process by observing the sight glass for clear liquid flow. The use of sight glass charging is valid only when unit is operating at full capacity (no unloaders energized). b. For complete charge of 30HL and HWA units or where refrigerant cylinder cannot be weighed, follow charging by sight glass procedure. The use of sight glass charging is valid only when unit is operating at full capacity (no unloaders energized). 6. a. The 30HL and HWA condenserless units are shipped with a holding charge only. After installation with the field-supplied system high side, the complete system should be charged until the sight glass is clear (with the unit running at full capacity). To achieve maximum system capacity, add additional charge equal to the difference between the condenser optimal charge and the condenser minimum charge, which can be obtained from the charge data provided in the condenser installation instructions. b. To ensure maximum performance of 30HWB units, raise the compressor saturated discharge temperature (SDT) to approximately 105 F (40.6 C) by throttling the condenser water intake. Add charge until there is approximately 15 to 17° F (8.3 to 9.4° C) of system subcooling (SDT minus actual temperature entering the thermostatic expansion valve). c. To ensure maximum performance of 30HK, HWC, and HWS units, raise the compressor saturated discharge temperature (SDT) to approximately 103 F (39.4 C) by throttling the condenser water intake. Add charge until there is approximately 8 to 10° F (4.4 to 5.6° C) for 30HK units or 12 to 14° F (6.7 to 7.8° C) for 30HWC, HWS units of system subcooling (SDT minus actual temperature entering the thermostatic expansion valve). 26 Check Oil Charge — The compressor(s) is factory- charged with oil. If oil is visible in the compressor sight glass(es), check the unit for operating readiness as described in Initial Check section (page 25), then start the unit. Observe oil level and add oil, if required, to bring the oil level in the compressor crankcase(s) to between 1.8 and 3.8 of the sight glass(es) during steady operation. TO ADD OIL 1. Close the suction shutoff valve and pump the compressor crankcase down to between zero and 2 psig (zero to 13.8 kPa) (the low-pressure switch must be jumpered). Wait a few minutes and repeat as needed until the pressure 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 compressor for about 20 minutes, and check the oil level. Use only Carrier-approved compressor oil: Petroleum Specialties, Inc. ............... .Cryol 150* Texaco,Inc. .........................CapellaWF-32 WitcoChemicalCo. .....................Suniso3GS *Factory charge. Do not reuse drained oil, and do not use any oil that has been exposed to the atmosphere. TO REMOVE OIL The crankcase will be under slight pressure. Be careful not to lose the entire oil charge. Gloves and eye protection 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 the compressor base to allow the oil to seep out past plug threads. Be careful not to remove plug; the entire oil charge may be lost. Small amounts of oil can be removed through oil pump discharge connection. START-UP AND OPERATION Operation Checks — Start-up should be performed only under supervision of an experienced refrigeration technician. 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 hours before the chiller is started. 2. Open all system valves that may have been closed during or after charging. 3. Check air-handling equipment, chilled water (fluid) and condenser pumps, and any other equipment connected to the chiller. 4. Start the unit by moving the ON-OFF switch to the ON position. 5. Check all controls for proper operation. Follow Start-Up Checklist procedures in these instructions. 6. Adjust the water regulating valve (where used) to obtain the most economical head pressure (based on the relative cost of water and...

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