Carrier 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 63

TUBE SHEET
Fig. 36 -- Elliott Tube Plug
Table 35 -- Plug Component Parts
COMPONENTS FOR PLUGGING PART NUMBER
For Tubes
Brass Pin 853103-1"
853002-640 or 657*
Brass Ring (measure tube
before ordering)
For Holes without tubes
Brass Pin 853103-1A
Brass Ring 85102-738
Loctite No. 675 1-
Locquic "N"I-
Roller Extension S82-112/11
*Order directly from Elliot Tube Company, Dayton, OH or RCD.
1-Can be obtained locally.
Table 36 -- Plug Parts
PLUG COMPONENT
Tube sheet hole diameter
Tube OD
Tube ID after rolling (includes
expansion due to clearance.)
in,
0.756
0.750
0.650 to
0.667
SIZE
mm
19.20
19.05
16.51 to 16.94
NOTE: Tubes replaced along heat exchanger head partitions must
be flush with tube sheet (both ends).
RETUBING --When mtubing is required, obtain service of
qu_flified personnel experienced in boiler maintenance and
mpail: Most standard procedures can be followed when retub-
ing file coolers. An 8% crush is recommended when rolling
replacement tubes into the tubesheet.
The following Elliott Co. tube rolling tools am required:
• Expander Assembly (113123)
• Cage (2134123)
• Mandrel (213123)
• Rolls (2115122)
Place one drop of Ix)ctite No. 675 or equivalent on top of
tube prior to rolling. This materi_fl is intended to "wick" into file
area of the tube that is not rolled into the tube sheet, and prevent
fluid from accumulating between the tube and the tube sheet.
New tubes must also be rolled into the center tubesheet to
prevent cimuit to cimuit leaks.
TIGHTENING COOLER HEAD BOLTS
Preparation -- When reassembling cooler heads, always
check the condition of the O-rings ilLst. The O-ring should be
replaced if them is visible signs of deterioration, cuts or
damage. Apply a thin film of grease to the O-ring before
installation. This will aid in holding the O-ring in the groove
while the head is installed. Torque all bolts to file following
specification and in sequence:
3/4-in. Diameter Perimeter Bolts (Grade 5) .... 200 to 225 ft-lb
(271 to 305 N-m)
1. Install zfllbolts finger tight.
2. Bolt tightening sequence is outlined in Fig. 37. Follow
file numbering or lettering sequence so that pressure is
evenly applied to O-ring.
3. Apply torque in one-third steps until required torque is
roached. Ix)ad all bolts to each one-third step before pro-
ceeding to next one-third step.
4. No less than one hour latel: mtighten all bolts to required
torque values.
5. After refrigerant is restored to system, check for rel]iger-
ant le_tks using recommended industry practices.
6. Replace cooler insulation.
INSPECTING/CLEANING HEAT EXCHANGERS --In-
spect and clean cooler tubes at the end of the first operating
season. Because these tubes have internal ridges, a rotary-type
tube cleaning system is necessary to fully clean the tubes. Tube
condition in the cooler will determine the scheduled frequency
for cleaning, and will indicate whether water treatment is
adequate in the chilled water/brine circuit. Inspect the entering
and leaving water thermistor wells for signs of conosion or
scale. Replace the well if corroded or remove any scale if
found.
Hard sc_fle may require chemical treatment for its preven-
tion or removal. Consult a water treatment specialist for
proper treatment procedures.
WATER TREATMENT- Untreated or improperly treated
water may result in corrosion, scaling, erosion or algae. The
services of a qualified water treatment specialist should be
obtained to develop and monitor a treatment program.
WiLter must be within design flow limits, clean and treated
to ensure proper machine performance and reduce file
potential of tubing dmnage due to corrosion, sc_fling, and
algae. Career assumes no responsibility for cooler d_unage
resulting from untreated or improperly treated watel:
®
Fig. 37- Cooler Head Recommended
Bolt Torque Sequence
SINGLE
ONLY
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