Carrier XRV Dokumentacja Pobierz pdf (Strona 84)

b. Close pumpout and storage tank valves 2, 4, 5, and

10, and close chiller charging valve 7; open chiller

isolation valve 11 and any other chiller isolation

valves, if present.

c. Open pumpout and storage tank valves 3 and 6;

open chiller valves 1a and 1b.

d. Gradually crack open valve 5 to increase chiller

pressure to 35 psig (241 kPa). Slowly feed refriger-

ant to prevent freeze-up.

e. Open valve 5 fully after the chiller pressure rises

above the freezing point of the refrigerant. Let the

storage tank and chiller pressure equalize.

3. Transfer remaining refrigerant.

a. Close valve 3.

b. Open valve 2.

c. Turn on pumpout condenser water.

d. Run the pumpout compressor until the storage tank

pressure reaches 5 psig (34 kPa), 18 in. Hg vacuum

(41 kPa absolute) in Manual or Automatic mode.

e. Turn off the pumpout compressor.

f. Close valves 1a, 1b, 2, 5, and 6.

g. Turn off pumpout condenser water.

4. Drain the contaminants from the bottom of the storage

tank into a container. Dispose of contaminants safely.

GENERAL MAINTENANCE

Refrigerant Properties —

The standard refrigerant for

the 19XRV chiller is HFC-134a. At normal atmospheric

pressure, HFC-134a refrigerant will boil at –14 F (–25 C) and

must, therefore, be kept in pressurized containers or storage

tanks. The refrigerant is practically odorless when mixed with

air and is noncombustible at atmospheric pressure. Read the

Material Safety Data Sheet and the latest ASHRAE Safety

Guide for Mechanical Refrigeration to learn more about safe

handling of this refrigerant.

Adding Refrigerant — Follow the procedures de-

scribed in Trim Refrigerant Charge section, page 85.

Removing Refrigerant — If the optional pumpout sys-

tem is used, the 19XRV refrigerant charge may be transferred

to a pumpout storage tank or to the chiller condenser or cooler

vessels. Follow the procedures in the Pumpout and Refrigerant

Transfer Procedures section when transferring refrigerant from

one vessel to another.

Adjusting the Refrigerant Charge — If the addi-

tion or removal of refrigerant is required to improve chiller

performance, follow the procedures given under the Trim

Refrigerant Charge section, page 85.

Refrigerant Leak Testing — Because HFC-134a re-

frigerant is above atmospheric pressure at room temperature,

leak testing can be performed with refrigerant in the chiller.

Use an electronic halide leak detector, soap bubble solution, or

ultrasonic leak detector. Ensure that the room is well ventilated

and free from concentration of refrigerant to keep false read-

ings to a minimum. Before making any necessary repairs to a

leak, transfer all refrigerant from the leaking vessel.

Leak Rate — It is recommended by ASHRAE that chillers

be taken off line immediately and repaired if the refrigerant

leak rate for the entire chiller is more than 10% of the operating

refrigerant charge per year.

In addition, Carrier recommends that leaks totalling less

than the above rate, but more than a rate of 0.1% of the total

charge per year, should be repaired during annual maintenance

or whenever the refrigerant is transferred for other service

work.

Test After Service, Repair, or Major Leak — If

all the refrigerant has been lost or if the chiller has been opened

for service, the chiller or the affected vessels must be pressure

tested and leak tested. Refer to the Leak Test Chiller section to

perform a leak test.

TESTING WITH REFRIGERANT TRACER — Use an en-

vironmentally acceptable refrigerant as a tracer for leak test

procedures. Use dry nitrogen to raise the machine pressure to

leak testing levels.

TESTING WITHOUT REFRIGERANT TRACER — Anoth-

er method of leak testing is to pressurize with nitrogen only and

to use a soap bubble solution or an ultrasonic leak detector to

determine if leaks are present.

TO PRESSURIZE WITH DRY NITROGEN

NOTE: Pressurizing with dry nitrogen for leak testing should

not be done if the full refrigerant charge is in the vessel

because purging the nitrogen is very difficult.

1. Connect a copper tube from the pressure regulator on the

cylinder to the refrigerant charging valve. Never apply

full cylinder pressure to the pressurizing line. Follow the

listed sequence.

2. Open the charging valve fully.

3. Slowly open the cylinder regulating valve.

4. Observe the pressure gage on the chiller and close the

regulating valve when the pressure reaches test level. Do

not exceed 140 psig (965 kPa).

5. Close the charging valve on the chiller. Remove the

copper tube if it is no longer required.

VALVE 1a1b2345671011

CONDITION C C C C C

VALVE 1a1b2345671011

CONDITION C C C C

VALVE 1a1b2345671011

CONDITION CCCCCCCCC

DANGER

Refrigerant HFC-134a will dissolve oil and some nonme-

tallic materials, dry the skin, and, in heavy concentrations,

may displace enough oxygen to cause asphyxiation. When

handling this refrigerant, protect the hands and eyes and

avoid breathing fumes.

CAUTION

Always use the compressor pumpdown function in the

Control Test table to turn on the cooler pump and lock out

the compressor when transferring refrigerant. Liquid refrig-

erant may flash into a gas and cause water in the heater

exchanger tubes to freeze when the chiller pressure is

below 35 psig (241 kPa) for HFC-134a, resulting in equip-

ment damage.

WARNING

Refrigerant HFC-134a should not be mixed with air or

oxygen and pressurized for leak testing. In general, this

refrigerant should not be present with high concentrations

of air or oxygen above atmospheric pressures, because the

mixture can undergo combustion, which could result in

serious personal injury or death.

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