Reassembly; Completion - Carrier 16JT Series Start Up & Operation Manual

5. Check the impeller wear surfaces. If very rough or worn
to outside diameters less than listed in Table 11, replace
the impeller.
Table 11 — Maximum Wear Ring
Inner Diameters
MOTOR SIZE MAX. MOTOR RING
(D1)
kW in.
1.5 3.47
3.7 3.95
5.5 3.95
7.5 3.95
6. Check the wear rings. If the wear surfaces are very rough
or deeply scratched, or are worn to inner diameters less
than listed in Table 12, replace the wear ring. They are
retained by setscrews (Items 26 and 27).
Table 12 — Minimum Impeller Wear Diameters
MIN. MOTOR SIDE
MOTOR SIZE
kW in.
1.5 3.45
3.7 3.92
5.5 3.92
7.5 3.92
7. 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 retained
by pins (Items 10 and 37).
8. Check the condition of the radial bearing sleeve faces on
the rotor shaft. If very rough, deeply scratched, or se-
verely worn, they should be replaced. They are retained
by pins.
9. Check the motor insulation resistance. If less than
10 milliamps, the windings must be dried.
MAX. CASING RING
(D2)
mm in. mm
88.2 3.00 76.2
100.2 3.95 100.2
100.2 3.95 100.2
100.2 3.95 100.2
MIN. MOTOR SIDE
(D1) (D2)
mm in. mm
87.6 2.98 75.6
99.6 3.92 99.6
99.6 3.92 99.6
99.6 3.92 99.6

REASSEMBLY

1. Clean all parts, gasket surfaces, and O-ring grooves. Use
new gaskets (Items 6 and 22) and new O-rings (Items 2
and 39).
2. Install motor end radial bearing (Item 7) in the motor end
cover (Item 5) and apply a small amount of gasket paste
to both sides of the gasket (Item 6). Mount the motor end
cover and gasket, aligning the match marks applied dur-
ing disassembly. The internal flow passage ''A'' should
be 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 (Item
15), 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 the
wear ring housing, aligning the match marks applied dur-
ing disassembly. The internal flow passage ''A'' should
be 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). Bend
washer 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 in
place.
9. Apply a small amount of gasket paste to both sides of
gasket (Item 22) and position on pump casing flange. Slide
motor stator housing and adaptor flange assembly into pump
casing, aligning the match marks applied during disas-
sembly. Use blocking to support the motor stator until all
bolts have been tightened and the motor support, if used,
has been reconnected.

COMPLETION

1. Leak test affected joints to be sure all pump connections
are 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 box
cover.
5. Restore power supply to pump and chiller controls.
6. Record inspection date and results.
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