Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting

Also see for AQUASNAP 30MPA: User manual Operation and service manual Installation instructions

Carrier AquaSnap 30MPA Series Controls, Start-up, Operation, Service, And Troubleshooting Manual pdf 39 page image

39By following these evacuation and dehydration procedures,the amount of moisture present in the system will beminimized. It is required that liquid line filter driers be installedbetween the condenser(s) and the expansion devices to captureany foreign debris and provide additional moisture removalcapacity.LIQUID CHARGING METHODFor 30MP015-045: Add charge to the unit through the liquidline service valve. Never charge liquid into the low-pressureside of the system.For 30MP050-071: Add the charge to the unit through the highflow Schrader valve on the filter drier.1. Close liquid line ball valve (30MPA only).2. Connect a refrigerant cylinder loosely to the high flowSchrader valve connection on the liquid line. Purge thecharging hose and tighten the connections.3. Open the refrigerant cylinder valve.4. If the system has been dehydrated and is under vacuum,break the vacuum with refrigerant gas. For R-410A, buildup system pressure to 101 psig and 32 F (697 kPa and0° C). Invert the refrigerant cylinder so that the liquid re-frigerant will be charged.5. a. For complete charge of 30MPW units, followcharging by weight procedure. When charge isnearly full, complete the process by observing thesight glass for clear liquid flow while the unit isoperating. The use of sight glass charging is validonly when unit is operating at full capacity.b. For complete charge of 30MPA units or whererefrigerant cylinder cannot be weighed, follow thecondenser manufacturer’s charging procedure orfollow charging by sight glass procedure. The useof sight glass charging is valid only when unit isoperating at full capacity.6. a. The 30MPA condenserless units are shippedwith a nitrogen holding charge. After installationwith the field-supplied system high side, the com-plete system should be evacuated and charged perthe condenser manufacturer’s charging procedureor charged until the sight glass is clear (with theunit running at full capacity). To achieve maxi-mum system capacity, add additional charge equalto the difference between the condenser optimalcharge and the condenser minimum charge, whichcan be obtained from the charge data provided inthe condenser installation instructions.b. To ensure maximum performance of 30MPWunits, raise the compressor saturated dischargetemperature (SDT) to approximately 100 F(37.8 C) by throttling the condenser water intake.Add charge until there is approximately 9 to 12° F(5.0 to 6.6° C) of system subcooling (SDT minusactual temperature entering the expansion valve).Check Compressor Oil Level — After adjusting therefrigerant charge, allow each circuit to run fully loaded for20 minutes. Stop the compressors and check the oil level. Oillevel should be 1/8 to 3/8 up on the sight glass.Add oil only if necessary to bring the oil into view in thesight glass. If oil is added, run the circuit for an additional10 minutes, then stop and check oil level. If the level remainslow, check the piping system for proper design for oil return;also, check the system for leaks. If checking the oil level withunit running in part load, let unit run one hour, then run at fullload for 10 minutes. If oil does not return to acceptable sightglass levels, check for correct suction piping and line sizing.Adjust Oil Charge — Although the compressors arefactory charged with oil, additional oil is likely required tomaintain the oil level in the compressor. Tables 37 and 38 indi-cate the likely amount required based on the liquid line sizeand system piping length. Additional lubricant estimate isbased on using recommended pipe sizes. Values listed are esti-mates only. See Add Oil section for Carrier-approved oils.After operating the compressor for a period of time, the oillevel should be between 1/8 and 3/8 of the oil sight glass. Thecompressor oil level should be checked with the compressoroff to avoid the sump turbulence when the compressor is run-ning. Oil must be added if the oil level does not meet therequirements.Table 37 — 60 Hz Additional Lubricant (English)Table 38 — 60 Hz Additional Lubricant (SI)IMPORTANT: Oil level should only be checked when thecompressors are off.UNIT SIZE CONDENSER09DPADDITIONAL LUBRICANT (FLUID OUNCES) REQUIRED FOR PIPING AND REFRIGERANTUp to 25 ft 25 to 50 ft 50 to 75 ft 75 to 100 ft 100 to 125 ft 125 to 150 ft 150 to 175 ft 175 to 200 ft30MPA015 S018 0 9 11 12 13 14 15 1630MPA020 S020 11 12 13 14 21 23 26 2830MPA030 S030 13 15 17 20 22 24 27 2930MPA040 M040 27 30 33 36 51 57 63 6830MPA045 M050 27 30 33 37 52 57 63 6930MPA050 M050 27 30 34 38 53 59 65 7130MPA055 M055 27 31 35 39 53 59 65 7130MPA060 M060 28 32 36 40 54 60 66 7230MPA065 M065 33 37 41 45 59 65 71 7730MPA071 M075 39 43 47 51 65 71 77 83UNIT SIZE CONDENSER09DPADDITIONAL LUBRICANT (ML) REQUIRED FOR PIPING AND REFRIGERANTUp to 7.5 m 7.5 to 15 m 15 to 22.5 m 22.5 to 30 m 30 to 37.5 m 37.5 to 45 m 45 to 52.5 m 52.5 to 60 m30MPA015 S018 0 262 319 352 384 417 450 48230MPA020 S020 315 347 380 413 620 688 756 82330MPA030 S030 372 440 508 575 643 710 778 84630MPA040 M040 784 881 977 1074 1511 1676 1841 200530MPA045 M050 791 888 984 1081 1518 1683 1848 201230MPA050 M050 783 898 1014 1129 1546 1722 1897 207330MPA055 M055 795 911 1026 1141 1558 1734 1910 208530MPA060 M060 825 941 1056 1171 1588 1764 1939 211530MPA065 M065 976 1091 1206 1322 1739 1914 2090 226630MPA071 M075 1147 1263 1378 1493 1910 2086 2261 2437