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170.600-IOM (JUN 11)
Page 10
OPERATION
PRESTART CHECKLIST
After the PowerPac
™
has been installed and all connections
for refrigerant, water and electricity, instruments and safety
switches have been completed, proceed as follows:
Check the rotation direction of the motor, with the coupling
dismantled, to be certain it is correct. An arrow on the
compressor end-cover marks the proper direction of
rotation. (See PRESTART CHECKLIST in FORMS section)
CHECKING MOTOR/COMPRESS OR ROTA TION
Make sure coupling hubs are tight-
ened to the shaft before rotating the
motor to prevent them from flying
off and possibly causing serious injury or death.
Injury may occur if loose clothing,
etc, becomes entangled on the spin-
ning motor shaft.
COMPRESSOR ROTATION IS
CLOCKWISE WHEN FACING
THE END OF THE COMPRES-
SOR SHAFT. Under NO condi-
tions should the motor rotation
be check ed with the coupling
center installed as damage to
the com pressor may result.
Bump the motor to check for correct compressor rotation.
After verification, install the disk drive spacer, as applicable.
COMPRESSOR/MOTOR COUPLING
INSTALLATION
The PowerPac™ chiller has compressor-to-motor alignment
through the use of a machined cast iron tunnel. This tunnel
is factory set through machining tolerances ensuring mo-
tor/compressor alignment. No alignment is required in the
field. For replacement motors, the shaft alignment should be
checked and tolerances verified with the Johnson Controls-
Frick service department.
CH
between Shaft Spacing
Series
Min.
Max.
Size
In.
mm
In.
6
2
50.8
2¾
7
2B\zn
58.7
3M\zn
8
2>\zn
65.1
4
9
3Z\zn
77.8
4B\,
10
3>\zn
90.5
5¼
11
104.8
4Z\,
5M\,
FRICK
COMPRESSOR
COUPLING DATA TAbLE
Coupling Hub
Shaft Engagement
Min.
Max.
mm
In.
mm
In.
69.9
1
25.4
1ZB\zn
87.3
1
25.4
2C\zn
101.6
1Z\zn
27.0
2½
117.5
1M\zn
36.5
3
133.4
1ZZ\zn
42.9
3½
149.2
47.6
1M\,
4
POWERPAC
®
™
OPERATION
A clamping style Elastomeric
Coupling is used in most
applications. This coupling
consists of two drive hubs
and a gear-type Hytrel or
EDPM and neoprene drive
spacer. The split hub is
clamped to the shaft by
tightening the clamp screws.
Torque is transmitted from
the motor through an elastomeric gear which floats freely
between the hubs. Because of the use of a motor/compressor
adapter housing, no field alignment is necessary.
1. Inspect the shaft of the motor and compressor to ensure
that no nicks, grease, or foreign matter is present.
2. Inspect the bores in the coupling hubs to make sure that
they are free of burrs, dirt, and grit.
3. Check that the keys fit the hubs and shafts properly.
4. Slide one hub onto each shaft as far as possible. It may
be necessary to use a screwdriver as a wedge in the slot
to open the bore before the hubs will slide onto the shafts.
5. Hold the elastomeric gear between the hubs and slide both
hubs onto the gear to fully engage the mating teeth. Center
the gear and hub assembly so there is equal engagement on
both shafts. Adjust the space between hubs as specified in
the Coupling Data Table below.
6. Torque the clamping bolts and the keyway set screws in
both hubs to the torque value given in the Coupling Data
Table. DO NOT USE ANY LUBRICANT ON THESE BOLTS.
Face
Spacing
Torque (Dry)
mm
In.
mm
Ft-Lb
49.2
7/8
22.2
15
55.6
1Z\zn
27.0
30
63.5
1Z\,
28.6
55
76.2
1M\zn
36.5
55
88.9
1ZZ\zn
42.9
130
101.6
47.6
130
1M\,
COUPLING
Clamp bolt
Keyway
Setscrew Torque
Size
Nm
Ft-Lb
20.3
1/4-20 UNC
13
40.7 5/16-24 UNF
13
74.6
3/8-24 UNF
13
74.6
3/8-24 UNF
13
176.3 1/2-20 UNF
13
176.3 1/2-20 UNF
13
Size
Nm
UNC
17.6
5/16-18
17.6
5/16-18
17.6
5/16-18
17.6
5/16-18
17.6
5/16-18
17.6
5/16-18
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