Carrier 23XL Especificações descarregar pdf (Página 40)

Leak Test Machine — Due to regulations regarding re-

frigerant emissions and the difficulties associated with sepa-

rating contaminants from refrigerant, Carrier recommends

the following leak test procedures. See Fig. 30 for an outline

of the leak test procedures. Refer to Fig. 24 and 25 during

pumpout procedures. See the Pumpout and Refrigerant Trans-

fer Procedures Section on page 61. Refer to Tables 6A-6D

for temperature/pressure relationships for HCFC-22 and HFC-

134a refrigerants. See Fig. 31-34.

1. If the pressure readings are normal for machine

condition:

a. Evacuate the holding charge from the vessels, if present.

b. Raise the machine pressure, if necessary, by adding

refrigerant until pressure is at equivalent saturated pres-

sure for the surrounding temperature.

Never charge liquid refrigerant into the machine if

the pressure in the machine is less than 68 psig

(469 kPa) [35 psig (241 kPa)]. Charge as a gas only,

with the cooler and condenser pumps running, until

this pressure is reached, using PUMPDOWN and TER-

MINATE PUMPDOWN/LOCKOUT mode on the

PIC. Flashing of liquid refrigerant at low pressures

can cause tube freeze-up and considerable

damage.

c. Leak test machine as outlined in Steps3-7.

2. If the pressure readings are abnormal for machine

condition:

a. Prepare to leak test machines shipped with refrigerant.

If machine is shipped with refrigerant, proceed to

Step 2h.

b. Check for large leaks by connecting a nitrogen bottle

and raising the pressure to 30 psig (207 kPa). Soap

test all joints. If the test pressure holds for 30 minutes,

prepare the test for small leaks (Steps 2g - h).

c. Plainly mark any leaks which are found.

d. Release the pressure in the system.

e. Repair all leaks.

f. Retest only those joints that were repaired.

g. After successfully completing the test for large leaks,

remove as much nitrogen, air, and moisture as pos-

sible, given the fact that small leaks may be present in

the system. This can be accomplished by following

the dehydration procedure, outlined in the Machine De-

hydration section, page 48.

h. Slowly raise the system pressure to a maximum of 210

psig (1448 kPa) but no less than 68 psig (469 kPa)

[35 psig (241 kPa)] by adding refrigerant. Proceed with

the test for small leaks (Steps3-7).

3. Check the machine carefully with an electronic leak de-

tector, halide torch, or soap solution.

4. Leak Determination — If an electronic leak detector in-

dicates a leak, use a soap bubble solution, if possible, to

conﬁrm. Total all leak rates for the entire machine. Leak-

age at rates greater than 1 lb/year (0.45 kg/year) for the

entire machine must be repaired. Note total machine leak

rate on the start-up report.

5. If no leak is found during initial start-up procedures, com-

plete the transfer of refrigerant gas from the storage tank

to the machine. Retest for leaks.

6. If no leak is found after a retest:

a. Transfer the refrigerant to the storage tank and per-

form a standing vacuum test as outlined in the Stand-

ing Vacuum Test section, page 48.

b. If the machine fails this test, check for large leaks

(Step 2b).

c. Dehydrate the machine if it passes the standing vacuum

test. Follow the procedure in the Machine Dehydra-

tion section. Charge machine with refrigerant.

7. If a leak is found, pump the refrigerant back into the stor-

age tank, or if isolation valves are present, pump into the

vessel that is not leaking.

Transfer the refrigerant until machine pressure is at least

equal to the pressure speciﬁed by the EPA under 40CFR

Part 82.

Repair the leak and repeat the procedure, beginning from

Step 2h to ensure a leaktight repair. If machine is opened

to the atmosphere for an extended period, evacuate it be-

fore repeating leak test.

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Carrier 23XL Especificações Página 40

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