Carrier 17EX specifications Flange Nut Tightening Torques Low Speed Couplings Only

2.Offset and Angular Alignment Ð Reverse dial indication or optical methods of alignment (such as lasers) are rec- ommended. A cold alignment and a hot check (with cor- rections, if necessary) are required. The hub ¯ange OD can be used to mount the alignment equipment and is ma- chined to be concentric to the coupling bore. It can be used as the reference diameter.

3.Final Assembly Ð The terminology used to identify parts and the order of assembly may differ from one coupling style to another. Follow the instructions that apply to the coupling you are installing.

High Speed Coupling (Spacer Style):

e.Place the disc pack nuts on the bolts. Tighten all nuts evenly and in an alternating fashion to the torque speci- ®ed in Table 9.

Low Speed Coupling (Close-Coupled Style):

a.Place the disc pack and adapter in position over the hub body diameter. The reamed holes in the adapter should be aligned with the large clearance holes in the hub as in the upper portion of Fig. 30. The large clear- ance holes in the adapter should be aligned with the reamed holes in the hub as shown in the lower portion of Fig. 30.

a.Place the spacer in position between the hub ¯anges. Place the disc packs between the ¯anges on both ends of the coupling.

b.Insert the disc pack bolt into the reamed hole of the hub and through the disc pack bushing. See Fig. 29 (compressor side). The ¯at of the bolt head acts as a bolt lock with the hub body. Make sure the spacer is properly indexed for the large ¯ange holes to receive the bolt ends. Tap the bolts lightly for full engagement until the heads rest on the hub ¯ange surface. Repeat for the other bolts.

c.Place the spacing washers and disc pack nuts on the bolts. Tighten all nuts evenly and in an alternating fash- ion to the torque speci®ed in Table 9.

d.Place a spacing washer over a disc pack bolt. Insert the bolt through the large hub ¯ange hole and the disc pack bushing. See Fig. 29 (gear side). Tap the bolts lightly for full engagement. Repeat for the other bolts.

DISK ADAPTERS

PACK

DISC

PACK

BOLT

HUB

MOTOR

SIDE

SPACING

WASHER

DISC

PACK

NUT

GEAR

SIDE

SHAFT PREPARATION (0.19 IN.

[4.83 mm]

NOTES:

1.Compressor shaft should be in the thrust position and gear shaft should be on geometric center when coupling is positioned as shown.

2.The taper is 1 inch per side for the driven unit bore (compressor side).

Fig. 29 Ð Typical High Speed Coupling for 17FX

Compressor/External Gear (Spacer Style)

Table 9 Ð Disc Pack Nut Tightening Torques

	Coupling	Nut	Tightening	Torque	Tightening	Torque
				(dry)		(lubed)*
	Size	Size	ft-lb		ft-lb
				N-m		N-M
	204	1/2-20	55	75	45	60
	304	5/8-18	115	155	90	120
*Light machine oil.

FLANGE BOLT FLANGE NUT

NOTE: Motor rotor should be positioned on the mechanical center and gear shaft should be on geometric center when coupling is po- sitioned as shown.

Fig. 30 Ð Typical Low Speed Coupling for 17FX

Compressor/External Gear (Close Coupled)

b.Loosely assemble the disc pack bolts, nuts, and spac- ing washers. Half of the bolts attach the adapter to the disc pack. Refer to Fig. 30. These bolts are inter- spersed by bolts that attach the disc pack to the hub.

c.Tighten all nuts evenly and in an alternating fashion to the torque speci®ed in Table 9.

d.Bring the driving and driven equipment together until the ¯anges of the adapters just begin to touch. If there is a gap between the ¯anges at any point, adjust the axial position of the equipment until the amount of gap is cut in half to minimize the amount of axial mis- alignment.

e.Rotate the equipment shafts until the ¯ange holes are aligned.

f.Bolt the ¯anges together using the ¯ange bolts and nuts. See Fig. 30. Tighten all ¯ange nuts evenly and in a alternating fashion to the torque speci®ed in Table 10.

Table 10 Ð Flange Nut Tightening Torques

(Low Speed Couplings Only)

Coupling	Nut	Tightening	Torque	Tightening	Torque
			(dry)		(lubed)*
Size	Size	ft-lb	N-m	ft-lb	N-M
304	5/16-24	20	27	18	24
*Light machine oil.

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