Trane CenTraVac CDHG Assembly/Disassembly Manual page 31

Reassembly
N N O O T T I I C C E E
E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o r r e e m m o o v v e e t t h h e e s s t t r r a a i i n n r r e e l l i i e e f f w w i i t t h h t t h h e e s s e e n n s s o o r r
c c o o u u l l d d r r e e s s u u l l t t i i n n e e q q u u i i p p m m e e n n t t d d a a m m a a g g e e . .
D D o o N N O O T T a a t t t t e e m m p p t t t t o o p p u u l l l l s s e e n n s s o o r r b b u u l l b b t t h h r r o o u u g g h h t t h h e e
s s t t r r a a i i n n r r e e l l i i e e f f ; ; a a l l w w a a y y s s r r e e m m o o v v e e t t h h e e e e n n t t i i r r e e s s t t r r a a i i n n r r e e l l i i e e f f
w w i i t t h h t t h h e e s s e e n n s s o o r r . .
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 13, p. 32
specifications.
5. Install and tighten the motor mount bolts. See
Table 13, p. 32 for bolt torque specifications.
6. Remove the lifting equipment.
7. Set up dial indicators on the compressor end of the
compressor/motor assembly. See
The dial indicators are used to monitor horizontal
and vertical movement of the compressor/motor
CVHE-SVN04M-EN
for bolt torque
Figure 23, p. 31.
assembly when the suction elbow retaining bolts
are tightened. Support the dial indicators from the
condenser or from a floor stand.
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
suction elbow 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.
31 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.
Step 2. For the
Figure 23, p.
31