Dx Cooler Tightening Cooler Head Bolts - Carrier AQUAFORCE 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Table 55 — DX Cooler Unit Plug Component
Dimensions
PLUG COMPONENT
Tube sheet hole diameter
Tube OD
Tube ID after rolling (includes
expansion due to clearance.)
NOTE: Tubes next to gasket webs must be flush with tube sheet
(both ends).
Fig. 54 — Elliott Tube Plug
For the 30XA142,162,182,202,222,242,262,282,302,327,
352 DX coolers, the pass partition has a perforated distribution
plate in the inlet pass to more uniformly distribute the refriger-
ant as it enters the tubes of the cooler. The perforated distribu-
tion plate is on the tubesheet side of the pass partition. A tube
plug will interfere with the installation of pass partition. The
tube plug must be flush with the tube sheet to prevent this inter-
ference. The pass partition is symmetrical, meaning the parti-
tion plate can be rotated 180 degrees, however, the performance
of the machine will be affected if the pass partition is installed
incorrectly.
DX COOLER RETUBING — When retubing is required,
obtain service of qualified personnel experienced in boiler
maintenance and repair. Most standard procedures can be fol-
lowed when retubing the coolers. An 8% crush is recommend-
ed when rolling replacement tubes into the tubesheet.
The following Elliott Co. tube rolling tools are required:
• Expander Assembly
• Cage
• Mandrel
• Rolls
15
19
23
27
29
26
22
18
14
SIZE
in. mm
0.377-0.382 9.58-9.70
0.373-0.377 9.47-9.58
0.328 8.33
6
8 10
13
4
17
21
2
25
1
28
24
3
20
5
16
12
11
9
7
Fig. 55 — Bolt Tightening Sequence, 30XA082,092,102,122
Place one drop of Loctite No. 675 or equivalent on top of
tube prior to rolling. This material is intended to "wick" into the
area of the tube that is not rolled into the tube sheet, and prevent
fluid from accumulating between the tube and the tube sheet.

DX COOLER TIGHTENING COOLER HEAD BOLTS

(Fig. 55-58)
Gasket Preparation — When reassembling cooler heads, al-
ways use new gaskets. Gaskets are neoprene-based and are
brushed with a light film of compressor oil. Do not soak gasket
or gasket deterioration will result. Use new gaskets within
30 minutes to prevent deterioration. Reassemble cooler nozzle
end or plain end cover of the cooler with the gaskets. Torque all
cooler bolts to the following specification and sequence:
5 / -in. Diameter Perimeter Bolts (Grade 5) . . . 150 to 170 ft-lb
8
1 / -in. Diameter Flange Bolts (Grade 5) . . . . . . . . 70 to 90 ft-lb
2
1 / -in. Diameter Center Stud (Grade 5). . . . . . . . . 70 to 90 ft-lb
2
1. Install all bolts finger tight, except for the suction flange
bolts. Installing these flanges will interfere with tighten-
ing the center stud nuts.
2. Bolt tightening sequence is outlined in Fig. 55-58. Follow
the numbering or lettering sequence so that pressure is
evenly applied to gasket.
3. Apply torque in one-third steps until required torque is
reached. Load all bolts to each one-third step before pro-
ceeding to next one-third step.
4. No less than one hour later, retighten all bolts to required
torque values.
5. After refrigerant is restored to system, check for refriger-
ant leaks using recommended industry practices.
6. Replace cooler insulation.
a30-5330
19
23
27
29
26
22
18
83
(201 to 228 N-m)
(94 to 121 N-m)
(94 to 121 N-m)
6
10
8
13
15
4
17
2
21
25
1
28
3
24
20
5
16
12
14
11
9
7