Carrier 30XW150-400 Condenser Sizes 150-200 Evaporator Tube Components, Replace cooler insulation

LOW FLUID TEMPERATURE — Main Base Board is pro- grammed to shut chiller down if leaving fluid temperature drops below 34 F (1.1 C) for cooler fluid type water or below Brine Freeze Setpoint (Brine Freeze Setpoint, LOSP) for cooler fluid type brine. The unit will shut down without a pumpout. When fluid temperature rises to 6° F (3.3° C) above the leaving fluid set point, safety resets and chiller restarts. Reset is automatic as long as this is the first occurrence.

LOSS OF FLUID FLOW PROTECTION — All 30XW ma- chines include an integral flow switch that protects the cooler against loss of cooler flow. In addition, all models ordered for heat reclaim duty have factory installed condenser water sen- sors and an integral flow switch.

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 per pass can be plugged before retubing is necessary. Fig. 48 shows an Elliott tube plug and a cross-sectional view of a plug in place. See Tables 43-46 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 assistance.

CAUTION

Use extreme care when installing plugs to prevent damage to the tube sheet section between the holes.

a30-4083

Fig. 48 — Elliott Tube Plug

Table 43 — Condenser (Sizes 150-200) and

Evaporator Plug Component Parts

COMPONENT	PART NUMBER
For Tubes
Brass Pin	853103-1*
Brass Ring	853002-657 or 670* (Measure inside
	diameter of tube before ordering.)
For Holes without Tubes
Brass Pin	853103-1A*
Brass Ring	853002-738*
Loctite	No. 675†
Locquic	“N”†

*Order directly from Elliot Tube Company, Dayton, OH or RCD. †Can be obtained locally.

Table 44 — Condenser (Sizes 150-200) and

Evaporator Tube Components

COMPONENT	SIZE
	in.	mm
Tube Sheet Hole Diameter	0.752 to 0.757	19.10 to 19.23
Tube OD	0.742 to 0.748	18.85 to 19.00
Tube ID after Rolling
(includes expansion due to	0.666 to 0.681	16.92 to 17.30
clearance.)
LEGEND
ID — Inside Diameter
OD — Outside Diameter

NOTE: Tubes replaced along heat exchanger head partitions must be flush with tube sheet (both ends).

Table 45 — Condenser (Sizes 325-400) Plug

Component Parts

COMPONENT	PART NUMBER
For Tubes
Brass Pin	853103-2A*
Brass Ring	853002-918*
For Holes without tubes
Brass Pin	853103-3*
Brass Ring	853002-988*
Loctite	No. 675†
Locquic	“N”†

*Order directly from Elliot Tube Company, Dayton, OH or RCD. †Can be obtained locally.

Table 46 — Condenser (Sizes 325-400) Tube

Components

COMPONENT	SIZE
	in.	mm
Tube Sheet Hole Diameter	1.000 to 1.008	25.40 to 25.60
Tube OD	0.992 to 0.998	25.20 to 25.35
Tube ID after Rolling
(includes expansion due to	0.918 to 0.935	23.32 to 23.75
clearance.)
LEGEND
ID — Inside Diameter
OD — Outside Diameter

NOTE: Tubes replaced along heat exchanger head partitions must be flush with tube sheet (both ends).

RETUBING — When retubing is required, obtain service of qualified personnel experienced in boiler maintenance and repair. Most standard procedures can be followed when retub- ing the coolers. An 8% crush is recommended 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.

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:

3/4-in. Diameter Perimeter Bolts (Grade 5) . . . 200 to 225 ft-lb (271 to 305 N-m)

1.Install all bolts finger tight.

2.Bolt tightening sequence is outlined in Fig. 49. Follow the numbering or lettering sequence so that pressure is evenly applied to O-ring.

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.

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