Trane CVHS, Installation Instructions Manual

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