Reassembly - Trane CenTraVac CDHG Series Installation Manual

Reassembly

NOTICE
Equipment Damage!
Failure to remove the strain relief with the sensor
could result in equipment damage.
Do NOT attempt to pull sensor bulb through the strain
relief; always remove the entire strain relief with the
sensor.
It is important to remove used O-rings and gaskets and
clean joints before reassembling the compressor with new
O-rings and gaskets. All necessary replacement O-rings
and gaskets are supplied by the factory when the
compressor doweling or separable shell options are
ordered.
Use the following procedure to reattach the compressor/
motor assembly to the chiller.
1. Remove the protective covers on all compressor,
condenser, and evaporator connections. Clean all
mating surfaces using Loctite® "Chisel" cleaner or
CRC® Industrial Gasket Remover. Completely remove
old sealing compound from O-ring grooves. Use Loctite
"N" primer for final surface preparation.
2. Refer to CTV-SB-66F (General Service Bulletin:
CenTraVac O-Ring and Flange Sealant), or the most
recent version, for proper installation of gaskets, O-
Rings, and Loctite sealant. Install a new O-ring on the
compressor discharge connection mating surfaces.
Use Loctite 515 "Gasket Eliminator" to lubricate the O-
ring and provide additional sealing. This is the only
sealing compound recommended by Trane for use on
O-ring joints. To use this sealing compound, apply a
light bead (approximately 1/8-in. in diameter) to the O-
ring groove, insert the O-ring and then apply a light
bead to the O-ring. Also apply a 1/8-in. bead of sealing
compound between the O-ring groove and the bolt hole
circle. The parts can now be assembled.
3. Lift the compressor/motor assembly into place. Insert
the bolts in the compressor foot and discharge flange
connections. Before tightening any of these bolts,
reinstall the dowel pins in the compressor foot and
discharge flange.
4. Tighten the compressor foot and discharge flange
bolts. See Table 14, p. 34
5. Install and tighten the motor mount bolts. See
14, p. 34 for bolt torque specifications.
6. Remove the lifting equipment.
7. Set up dial indicators on the compressor end of the
compressor/motor assembly. See
dial indicators are used to monitor horizontal and
vertical movement of the compressor/motor assembly
when the suction elbow retaining bolts are tightened.
Support the dial indicators from the condenser or from
a floor stand.
CVHE-SVN04R-EN
for bolt torque specifications.
Table
Figure 23, p. 33. The
Figure 23. Suction elbow flange bolts
Set Up Dial
Indicator to Read
Horizontally
Set Up Dial Indicator
to Read Vertically
8. Clean the suction elbow flange surfaces and O-ring
grooves per Step 1. For the evaporator to suction elbow
joint, use Loctite 515 per
to compressor joint, use 1/8-in. GORE-TEX® Joint
Sealant placed approximately 1/8-in. in board of the O-
ring groove. This is used in addition to the O-ring. As an
option, Loctite 515 may be used in place of GORE-
TEX. However, great care must be taken to prevent the
sealant from entering the first stage IGV housing. Refer
to CTV-SB-66F (General Service Bulletin: CenTraVac
O-Ring and Flange Sealant), or the most recent
version.
9. Lift the suction elbow into place using a sling or chain-
fall hoist.
10. Install the suction elbow retaining bolts.
11. Tighten the retaining bolts only "hand tight". Tighten two
retaining bolts, 180 degrees apart at the compressor
connection. Then tighten two bolts, 180 degrees apart
at the evaporator connection. Alternate between
connections until all retaining bolts are tight. Monitor
the dial indicators to ensure that there is no more than
0.010 inches of compressor movement. If there is more
movement than this, loosen all of the bolts, "zero" the
dial indicators and repeat the procedure.
33 illustrates the bolt tightening sequence.
12. Reconnect the economizer vent pipes. Be sure to clean
the mating surfaces and use new gaskets on the
connections. Tighten the flange bolts just enough so
that the gasket material just begins to extrude from
between the flanges.
13. Reinstall all other chiller components which were
removed. Reconnect the inlet vane linkages.
14. Torque all bolts to specifications listed in
34.
Step 2. For the suction elbow
Figure 23, p.
Table 14, p.
33