Carrier 16JT Series Start Up & Operation Manual

Carrier 16JT Series Start Up & Operation Manual Manual pdf 39 page image

5. Check the impeller wear surfaces. If very rough or wornto outside diameters less than listed in Table 11, replacethe impeller.Table 11 — Maximum Wear RingInner DiametersMOTOR SIZE MAX. MOTOR RING(D1)MAX. CASING RING(D2)kW in. mm in. mm1.5 3.47 88.2 3.00 76.23.7 3.95 100.2 3.95 100.25.5 3.95 100.2 3.95 100.27.5 3.95 100.2 3.95 100.26. Check the wear rings. If the wear surfaces are very roughor deeply scratched, or are worn to inner diameters lessthan listed in Table 12, replace the wear ring. They areretained by setscrews (Items 26 and 27).Table 12 — Minimum Impeller Wear DiametersMOTOR SIZE MIN. MOTOR SIDE(D1)MIN. MOTOR SIDE(D2)kW in. mm in. mm1.5 3.45 87.6 2.98 75.63.7 3.92 99.6 3.92 99.65.5 3.92 99.6 3.92 99.67.5 3.92 99.6 3.92 99.67. Check the condition of the thrust collars (Items 9 and 36)on the rotor shaft. If very rough, deeply scratched, or se-verely worn, they should be replaced. They are retainedby pins (Items 10 and 37).8. Check the condition of the radial bearing sleeve faces onthe rotor shaft. If very rough, deeply scratched, or se-verely worn, they should be replaced. They are retainedby pins.9. Check the motor insulation resistance. If less than10 milliamps, the windings must be dried.REASSEMBLY1. Clean all parts, gasket surfaces, and O-ring grooves. Usenew gaskets (Items 6 and 22) and new O-rings (Items 2and 39).2. Install motor end radial bearing (Item 7) in the motor endcover (Item 5) and apply a small amount of gasket pasteto both sides of the gasket (Item 6). Mount the motor endcover and gasket, aligning the match marks applied dur-ing disassembly. The internal flow passage ‘‘A’’ shouldbe at the top as the pump is installed on the chiller.3. Place thrust bearings (Items 8 and 35) against their re-spective thrust collars on the rotor shaft (Item 17). Care-fully guide rotor (Item 16) into position within the stator(Item 13) to avoid damage to the bearings, rotor liner (Item15), and stator can (item 14).4. Install radial bearing (Item 34) and motor side wear ring(Item 27) in the wear ring housing (Item 33). Mount thewear ring housing, aligning the match marks applied dur-ing disassembly. The internal flow passage ‘‘A’’ shouldbe at the top as the pump is installed on the chiller.5. Install impeller (Item 25) with impeller key (Item 32),lock washer (Item 30) and locking screw (Item 31). Bendwasher tabs over flats of locking screw head.6. Turn impeller by hand to be sure it rotates easily.7. Install new O-rings (Items 2 and 39) in flanges for cir-culation pipe (Item 1) and mount pipe in place.8. Install pump casing wear ring (Item 29) if not already inplace.9. Apply a small amount of gasket paste to both sides ofgasket (Item 22) and position on pump casing flange. Slidemotor stator housing and adaptor flange assembly into pumpcasing, aligning the match marks applied during disas-sembly. Use blocking to support the motor stator until allbolts have been tightened and the motor support, if used,has been reconnected.COMPLETION1. Leak test affected joints to be sure all pump connectionsare tight. (See Machine Leak Test section, page 33.)2. Evacuate machine (see Machine Evacuation section,page 33).3. Recharge machine with same quantity of solution and re-frigerant as removed.4. Reconnect motor power leads to motor wires in same ar-rangement as when disconnected and replace junction boxcover.5. Restore power supply to pump and chiller controls.6. Record inspection date and results.39