Trane CVHS, Installation Instructions Manual

Page: 21 / 24

Reassembly
CVHS-SVN04E-EN 21
8. Lift the suction elbow into place using a sling or chain-
fall hoist.
9. Install the suction elbow retaining hex head screws.
10. Tighten the retaining screws only “hand tight”. Tighten
two retaining screws, 180 degrees apart at the
compressor connection. Then tighten two screws,
180 degrees apart at the evaporator connection.
Alternate between connections until all retaining
screws 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 screws, “zero” the dial indicators, and
repeat the procedure. Refer to
“Tightening Flanges,”
p. 21 for screw tightening sequences.
11. Reconnect the economizer vent pipe. Be sure to clean
the mating surfaces and use new O-rings on the
connections. Tighten first stage volute and economizer
top flange screws; refer to
Table 2, p. 21 and
“Tightening Flanges,” p. 21 .
12. Reinstall all other chiller components which were
removed.
13. Torque all screws to specifications listed in Table 2 .
14. Reconnect the previously cut compressor supply and
return lines and the motor cooling lines using the
factory-supplied couplings.
Optional Hinged Waterboxes
If the chiller includes optional hinged waterboxes and if the
waterboxes have been removed for installation or service,
or if waterbox holes do not line up with the tube sheet,
perform the following procedure.
1. Move waterbox into position.
2. Install the hex head screws for the waterbox and hand-
tighten.
3. Lift and hold the waterbox as high as the screws will
allow.
4. While holding the waterbox as high as the screws will
allow, tighten the waterbox screws to the tube sheet.
Torque to specifications listed in
Table 2 .
5. Move hinge into position.
6. Install hinge button head screws and hand-tighten.
7. Torque button head screws for center hinge section to
waterbox to specifications listed in Table 2 .
8. Lift lower hinge section and hold in contact with middle
hinge section.
9. Torque button head screws for lower hinge section to
tube sheet to specifications listed in Table 2 .
10. Torque button head screws for upper hinge section to
tube sheet to specifications listed in Table 2 .
Each waterbox hinge weighs 35 lb (15.9 kg); refer to
Table 1, p. 8 for condenser and evaporator waterbox
maximum weights.
Tightening Flanges
Flanges with 8 or 12 Screws
Tighten all screws to a snug tightness, following the
numerical sequence for the appropriate pattern as shown
below. Repeat this sequence to apply the final torque to
each screw.
Figure 21. Installation of 1/8-in. GORE-TEX tape Table 2. Screw torques for waterbox mounting
Screw Size Torque
(in) (mm) (ft·lb) (N·m)
1/2 13 70–100 95–136
5/8 16 130–190 176–258
Metric Screw Size (Non-Gasketed Joints or O-ring Joints)
Screw Size
Torque
(ft·lb) (N·m)
M8 12–16 16–22
M10 24–33 33–45
M12 48–65 65–89
M16 130–179 177–243
M20 239–334 324–453