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

Table 51 — Cooler Heater Operation Examples for Flooded Coolers
BRINE
OAT UNIT FREEZE
F (C) STATUS POINT
F (C)
50 36
OFF
(10) (2.2)
40 36
OFF
(4.4) (2.2)
40 15
OFF
(4.4) (–9.4)
40 36
OFF
(4.4) (2.2)
40 36
ON
(4.4) (2.2)
LEGEND
N/A — Not Applicable
OAT — Outdoor-Air Temperature
SSTA — Saturated Suction Temperature, Circuit A
SSTB — Saturated Suction Temperature, Circuit B
SSTC — Saturated Suction Temperature, Circuit C
FLOODED COOLER LOSS OF FLUID FLOW PROTEC-
TION — All 30XA ma-chines include an integral flow switch
that protects the cooler against loss of cooler flow.
FLOODED COOLER TUBE PLUGGING — A leaky tube
can be plugged until retubing can be done. The number of
tubes plugged determines how soon the cooler must be
retubed. All tubes in the cooler may be removed. Loss of unit
capacity and efficiency as well as increased pump power will
result from plugging tubes. Failed tubes should be replaced as
soon as possible. Up to 10% of the total number of tubes can
be plugged before retubing is necessary. Figure 52 shows an
Elliott tube plug and a cross-sectional view of a plug in place.
See Tables 52 and 53 for plug components. If the tube failure
occurs in both circuits using tube plugs will not correct the
problem. Contact your local Carrier representative for assis-
tance.
CAUTION
Use extreme care when installing plugs to prevent damage
to the tube sheet section between the holes.
FLOODED COOLER RETUBING — When retubing is re-
quired, obtain service of qualified personnel experienced in
boiler maintenance and repair. Most standard procedures can
be followed when retubing the coolers. An 8% crush is recom-
mended when rolling replacement tubes into the tubesheet.
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. New tubes must also be rolled into the center tubesheet
to prevent circuit to circuit leaks.
Fig. 52 — Elliott Tube Plug
COOLER
COOLER
HEATER
DELTA T
SETPOINT
F (C)
F (C)
6 42
(3.3) (5.6)
6 42
(3.3) (5.6)
6 21
(3.3) (–6.1)
6 42
(3.3) (5.6)
6 42
(3.3) (5.6)
a30-4083
81
SSTA SSTB SSTC
F (C) F (C) F (C)
N/A N/A N/A
41
N/A N/A
(5)
41
N/A N/A
(5)
52.1 52.1 52.1
(11.2) (11.2) (11.2)
N/A N/A N/A
Table 52 — Plug Component Parts
(Flooded Cooler Units Only)
COMPONENT
For Tubes
Brass Pin
Brass Ring
For Holes without tubes
Brass Pin
Brass Ring
Loctite
Locquic
Roller Extension
*Order directly from Elliot Tube Company, Dayton, OH or RCD.
†Can be obtained locally.
Table 53 — Flooded Cooler Tube Components
COMPONENT
Tube sheet hole diameter
Tube OD
Tube ID after rolling (includes
expansion due to clearance.)
NOTE: Tubes replaced along heat exchanger head partitions must
be flush with tube sheet (both ends).
FLOODED COOLER TIGHTENING COOLER HEAD
BOLTS
Preparation — When reassembling cooler heads, always
check the condition of the O-rings first. The O-ring should be
replaced if there 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 the following
specification and in sequence:
/ -in. Diameter Perimeter Bolts (Grade 5) . . . 200 to 225 ft-lb
3
4
COOLER
HEATER COMMENTS
STATUS
OAT
OFF >42 F
(5.6 C)
SSTA
ON <42 F
(5.6 C)
SSTA
OFF >21 F
(–6.1 C)
All SST
Temperatures
OFF
>52 F
(11.2 C)
Unit Status
OFF
ON
PART NUMBER
853103-1*
853002-640 or 657*
(measure tube
before ordering)
853103-1A
85102-738
No. 675 †
"N"†
S82-112/11
SIZE
in. mm
0.756 19.20
0.750 19.05
0.650 to
16.51 to 16.94
0.667
(271 to 305 N-m)