Carrier 23XL Especificações descarregar pdf (Página 63)

g. Turn off pumpout condenser water.

VALVE 1a1b2345811121314151617

CONDITION C C CCCCC C CCCCCC

h. Proceed to Pumpdown test on the LID to turn off ma-

chine water pumps and lock out machine

compressor.

TRANSFER ALL REFRIGERANT TO COOLER/

COMPRESSOR VESSEL

1. Push refrigerant into the cooler vessel.

a. Valve positions:

VALVE 1a 1b 2 3 4 5 8 11 12 13 14 15 16 17

CONDITION C CC CCCCCC

b. Turn off machine water pumps and pumpout con-

denser water.

c. Turn on pumpout compressor to push refrigerant out

of the condenser.

d. When all liquid is out of the condenser close cooler

isolation valve 11.

e. Turn off the pumpout compressor.

2. Evacuate gas from the condenser vessel.

a. Access the Control Test, Pumpdown table on the LID

display to turn on the machine water pumps.

b. Close pumpout valves 3 and 4; open valves 2 and 5.

VALVE 1a1b2345811121314151617

CONDITION CC CCCCCCCC

c. Turn on pumpout condenser water.

d. Run the pumpout until the compressor reaches 18 in.

Hg vac (40 kPa abs.). Monitor pressure at the LID and

refrigerant gages.

e. Close valve 1b.

f. Turn off pumpout compressor.

g. Close valves 1a, 2, and 5.

VALVE 1a1b2345811121314151617

CONDITION C C CCCCC C CCCCCC

h. Turn off pumpout condenser water.

i. Proceed to Pumpdown test on the LID to turn off

machine water pumps and lockout machine

compressor.

Return Refrigerant to Normal Operating

Conditions

NOTE: Valve 14 is only available on Frame 1 and 2 ma-

chines. Valves 16 and 17 are only available on Frame 4 ma-

chines.

1. Be sure that the vessel that was opened has been

evacuated.

2. Access the Control Test, Terminate Lockout table to view

vessel pressures and turn on machine water pumps.

3. Open valves 1a, 1b, and 3.

VALVE 1a 1b 2 3 4 5 8 11 12 13 14 15 16 17

CONDITION C CCCCCCCCCC

4. Crack open valve 5, gradually increasing pressure in the

evacuated vessel to 68 psig (469 kPa) [35 psig

(141 kPa)]. Feed refrigerant slowly to prevent tube freeze

up.

5. Leak test to ensure vessel integrity.

6. Open valve 5 fully.

VALVE 1a1b2345811121314151617

CONDITION C C CCCCCCCC

7. Open valve 11 to equalize the liquid refrigerant level

between vessels.

8. Close valves 1a, 1b, 3, and 5.

9. Open isolation valves 12 and 13.

VALVE 1a1b2345811121314151617

CONDITION C C CCCCC CCCC

10. Proceed to Control Test Terminate Lockout table to turn

off water pumps and enable the machine compressor for

start-up.

GENERAL MAINTENANCE

Refrigerant Properties —

HCFC-22 and HFC-134a

are the standard refrigerants in the 23XL. At normal atmo-

spheric pressure, HCFC-22 will boil at −41 F (−40.5 C) and

HFC-134a will boil at −14 F (−25 C), and must, therefore,

be kept in pressurized containers or storage tanks. The re-

frigerants are practically odorless when mixed with air. Both

refrigerants are non-combustible at atmospheric pressure. Read

the Material Safety Data Sheet and the latest ASHRAE Safety

Guide for Mechanical Refrigeration to learn more about safely

handling of these refrigerants.

HCFC-22 and HFC-134a will dissolve oil and some non-

metallic materials, dry the skin, and, in heavy concen-

trations, may displace enough oxygen to cause asphyxi-

ation. In handling this refrigerant, protect the hands and

eyes and avoid breathing fumes.

Adding Refrigerant — Follow the procedures de-

scribed in the Charge Refrigerant into Machine section,

page 55.

Always use the compressor pumpdown function in the

Control Test mode to turn on the evaporator pump and

lock out the compressor when transferring refrigerant.

Liquid refrigerant may ﬂash into a gas and cause pos-

sible freeze-up when the machine pressure is below

65 psig (448 kPa) [30 psig (207 kPa)].

Removing Refrigerant — If the optional pumpout sys-

tem is used, the 23XL refrigerant charge may be transferred

to a storage vessel or within the condenser or cooler if iso-

lation valves are present. Follow procedures in the Pumpout

and Refrigerant Transfer Procedures section when removing

refrigerant from the storage tank to the machine.

Adjusting the Refrigerant Charge — If the addi-

tion or removal of refrigerant is required for improved ma-

chine performance, follow the procedures given under the

Trim Refrigerant Charge section, on page 64.

Refrigerant Leak Testing — Because HCFC-22 and

HFC-134a are above atmospheric pressure at room tempera-

ture, leak testing can be performed with refrigerant in the

machine. Use an electronic leak detector, halide leak detec-

tor, soap bubble solution, or ultra-sonic leak detector. Be sure

that the room is well ventilated and free from concentration

of refrigerant to keep false readings to a minimum. Before

making any necessary repairs to a leak, transfer all refrig-

erant from the leaking vessel.

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