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

Also see for 17EX Series: Start up & operation manual Start-up, operation and maintenance instructions

Contents

14. Reinstall the bearing housing split bolts. Before torqu-ing bearing housing cap bolts, rotate the shaft by handwhile bumping the bearing housing with a rubber or raw-hide mallet in the horizontal and axial planes to allowthe bearings to align themselves to the shaft journals.15. Torque the bearing housing cap bolts by following thetorque values as provided in Table 6 on page 51.Motor Handling/Rigging — Each motor is providedwith lifting lugs, welded to the four corners of the motorframe, for lifting the assembled chiller. The motor shouldalways be lifted by using the lifting lugs located on all fourcorners of the motor frame. (See Fig. 46.)Spreader bars of adequate capacity and number must beused to avoid applying any pressure against the top airhousing with the lifting plugs.If the motor is lifted with the top air housing removed, theangle of the lifting slings with the horizontal should neverbe less than 45 degrees.With the exclusion of the TEWAC cooler, the top air hous-ing is provided with 3 ⁄4 -10 tapped holes for lifting devices tobe installed in order to remove the air housing from the mo-tor. The top air housing can be detached by removing theenclosure holddown bolts, located in the inside corners ofthe enclosure. These enclosure holddown bolts are accessedthrough the louver/screens located on the front and rear endof the chiller or through access panels bolted to the sides ofthe enclosure.Uneven lifting must always be avoided. When singlepoint lifting is to be used, slings of equal lengths mustalways be used to avoid uneven lifting.Under no circumstances should the motor be lifted us-ing the shaft as an attachment point.NOTE: Refer to weights specified on certified drawing todetermine proper lifting equipment required for specific com-ponents or assemblies.Motor Storage — If the chiller is to be placed in ex-tended shutdown, certain precautions must be taken toprovide proper protection while the motor is being stored.The motor should be stored under cover in a clean, dry lo-cation and should be protected from rapid temperature changes.Since moisture can be very detrimental to electrical com-ponents, the motor temperature should be maintained at ap-proximately 5° F (3° C) above the dew point temperature byproviding either external or internal heat. If the motor isequipped with space heaters, they should be energized at thevoltage shown by the space heater nameplate attached to themotor. Incandescent light bulbs can be placed within the mo-tor to provide heat. However, if used, they must not be al-lowed to come in contact with any parts of the motor becauseof the concentrated hot spot that could result.This motor has been provided with a shaft shipping braceor shipping bolt (normally painted yellow) to prevent shaftmovement during transit, it must be removed to allow shaftrotation (refer to Before Initial Start-Up, Remove ShippingPackaging section, page 45). It is very important that thisbrace be reinstalled exactly as it was originally, before themotor is moved from storage or any time when the motor isbeing transported. This prevents axial rotor movement thatmight damage the bearings.Motors equipped with sleeve bearings are shipped fromthe factory with the bearing oil reservoirs drained. In stor-age, the oil reservoirs should be properly filled to the centerof the oil level gage with a good grade of rust inhibiting oil(refer to the certified drawing for oil viscosity and any spe-cial requirements). To keep the bearing journals well oiledand to prevent rusting, the motor shaft should be rotated sev-eral revolutions every 2 weeks. While the shaft is rotating itshould be pushed to both extremes of the endplay to allowfor oil flow over the entire length of the journals.External Gear Storage — All internal and unpaintedexternal surfaces of the gear drives have been treated with arust preventative at the factory before shipment. The pro-tective life of the rust preventative varies with temperaturefluctuations, atmospheric moisture content, degree of expo-sure to the elements during storage, and degree of contactwith other objects.Inspect all machined surfaces, and spray or add rust in-hibitor to exposed metal surfaces that may have had the pro-tective coating removed during shipping and handling.To be sure that the gear drive operates satisfactorily at start-up, take certain precautions when you receive it. The ex-pected length of storage and the storage atmosphere dictatethe maintenance schedule to be followed. The gear must al-ways be stored in its operating position, level on its mount-ing feet, and free of loads or weights on input and outputshafts.SHORT-TERM STORAGE (Indoors) — If the units are tobe stored for 30 days or less, observe the following precau-tions.• Store the unit in a clean, dry location with the factory pack-ing intact and with as nearly a constant temperature aspossible.• Elevate the unit a minimum of 6 in. above the floor level.• Avoid areas that are subject to extremes in temperature,vibration, and humidity.LONG-TERM STORAGE (Indoors) — If the unit is to bestored for more than 30 days, observe the following precau-tions. Store in a clean, dry location. Elevate the unit at aminimum of 6 in. above the ground floor level. Avoid areasthat are subject to extremes in temperature, vibration, andhumidity. In addition, do one of the following:• Remove the breather and replace it with pipe plugs. Packthe entire seal area with grease to form a vapor barrier andseal with tape.Fig. 46 — Motor Riggings81