| Refrigerant System Service
Basics |
Refrigerant Recovery
Use only service
equipment that is U.L-listed and is certified to meet the requirements of
SAE J2210 to remove HFC-134a(R-134a) from the air conditioning
system.
| -
|
Air conditioning refrigerant or
lubricant vapor can irritate your eyes, nose, or
throat. |
| -
|
Be careful when connecting service
equipment. |
| -
|
Do not breathe refrigerant or
vapor. | |
If accidental system
discharge occurs, ventilate work area before resume of
service.
Additional health and
safety information may be obtained from the refrigerant and lubricant
manufacturers.
| 1. |
Connect an R-134a refrigerant
Recovery/Recycling/Charging System (A) to the
high-pressure service port (B) and the low-pressure service port (C)
as shown, following the equipment manufacturer's
instructions.
|
| 2. |
Measure the amount of refrigerant oil removed
from the A/C system after the recovery process is completed. Be sure
to install the same amount of new refrigerant oil back into the A/C
system before charging. |
System Evacuation
Use only service
equipment that is U.L-listed and is certified to meet the requirements of
SAE J2210 to remove HFC-134a(R-134a) from the air conditioning
system.
| -
|
Air conditioning refrigerant or
lubricant vapor can irritate your eyes, nose, or
throat. |
| -
|
Be careful when connecting service
equipment. |
| -
|
Do not breathe refrigerant or
vapor. | |
If accidental system
discharge occurs, ventilate work area before resume of
service.
Additional health and
safety information may be obtained from the refrigerant and lubricant
manufacturers.
| 1. |
When an A/C System has been opened to the
atmosphere, such as during installation or repair, it must be
evacuated using an R-134a refrigerant Recovery/Recycling/Charging
System. (If the system has been open for several days, the
receiver/dryer should be replaced, and the system should be
evacuated for several hours.) |
| 2. |
Connect an R-134a refrigerant
Recovery/Recycling/Charging System (A) to the high-pressure service
port (B) and the low-pressure service port (C) as shown, following
the equipment manufacturer's instructions.
|
| 3. |
If the low-pressure does not reach more than
93.3 kPa (700 mmHg, 27.6 in.Hg) in 10 minutes, there is probably a
leak in the system. Partially charge the system, and check for leaks
(see Leak Test.). |
| 4. |
Remove the low pressure valve from the
low-pressure service port. |
System Charging
Use only service
equipment that is U.L-listed and is certified to meet the requirements of
SAE J2210 to remove HFC-134a(R-134a) from the air conditioning
system.
| -
|
Air conditioning refrigerant or
lubricant vapor can irritate your eyes, nose, or
throat. |
| -
|
Be careful when connecting service
equipment. |
| -
|
Do not breathe refrigerant or
vapor. | |
If accidental system
discharge occurs, ventilate work area before resume of
service.
Additional health and
safety information may be obtained from the refrigerant and lubricant
manufacturers.
| 1. |
Connect an R-134a refrigerant
Recovery/Recycling/Charging System (A) to the
high-pressure service port (B) as shown, following the equipment
manufacturer's instructions.
|
| 2. |
Add the same amount of new refrigerant oil to
system that was removed during recovery. Use only specified
refrigerant oil. Charge the system with 14.8 ± 0.88 oz. (420 ± 25g)
of R-134a refrigerant. Do not overcharge the system the compressor
will be damaged. |
Refrigerant Leak Test
Always conduct a leak
test with an electronic leak detector whenever leakage or refrigerant is
suspected and when conducting service operations which are accompanied by
disassembly or loosening or connection fittings.
|
In order to use the leak detector properly,
read the manual supplied by the
manufacturer. |
If a gas leak is
detected, proceed as follows:
| 1. |
Check the torque on the connection fittings
and, if too loose, tighten to the proper torque. Check for gas
leakage with a leak detector (A). |
| 2. |
If leakage continues even after the fitting
has been tightened, discharge the refrigerant from the system,
disconnect the fittings, and check their seating faces for damage.
Always replace, even if the damage is
slight. |
| 3. |
Check the compressor oil and add oil if
required. |
| 4. |
Charge the system and recheck for gas leaks.
If no leaks are found, evacuate and charge the system
again.
|
