Rx11-
FlushTM
Rx11-flush
is an ozone-safe solvent engineered specifically for flushing
refrigeration and air conditioning systems. Used exactly like the old R-11
flushing process, Rx11
is strong enough to rinse away particulate, sludge, carbon residues,
acids, oils and water. It enhances system service and avoids the need for
time-consuming repeat visits. Rx11-flush
should become an Integral part of standard procedures for any major system
repair, oil change-out or retrofit.
DESCRIPTION
Based on new and patented HFC solvents developed by
DuPont, Rx11
is ozone-safe, non-toxic, nonflammable and compatible with most materials
in a refrigeration system. The cleaner itself has excellent solvency
characteristics and it is packaged in a convenient pressurized container,
sufficient to purge a moderately contaminated five to seven ton air
conditioning or refrigeration system.
APPLICATION
From time to time, refrigeration and air conditioning
systems suffer failures which result in contamination. The most common
such failure is a compressor burnout. During such an event, the
refrigeration system becomes contaminated with large quantities of
disintegrating particulate, sludge, acids, carbon residues and possibly
moisture. All of these contaminants must be removed before the system is
returned to duty.
In earlier years, these systems were flushed with the
popular CFC-based solvent R-11. Nonflammable, plastic-safe and having a
very low boiling point, this material was favored because it was safe to
use, cleaned efficiently and was easily removed from the system.
Unfortunately, R-11 was a major ozone-depleter and was gradually phased
out of production. Since that time, many companies have attempted to
market alternative flushing agents based on terpene, hydrocarbon cleaners,
acid flushes and oil additives. To date, none of those contenders have
enjoyed the success of R-11 simply because none are as effective, as fast,
as affordable nor as safe.
Enter Rx11-flush,
pioneered by the same chemists who produced the original Rx11.
Rx11-flush
offers all of the benefits of R-11 without the environmental concerns.
This is a totally new chemical formulation based on new HFC technologies.
It is a powerful cleaner, stronger than R-11 ever was, and it is the best
prescription to effectively scrub the inside of the refrigeration system.
It dries quickly, has a low boiling point (106oF), has no
aroma, will not attack components, offers great worker safety ratings and
is affordable priced. Rx11-flush
is the industry’s best answer for major system overhauls.
FEATURES AND BENEFITS
Safe, nontoxic, and nonflammable
Used the same way as R-11
Low Boiling point enhances complete
evaporation
Cleaning is fast, efficient and
verifiable
Can be used for new system cleaning or
retrofits
Modern packaging minimizes solvent
exposure to hands, eyes, and lungs
The solvent is approved as part of the
U.S. EPA’s Significant New Alternatives Program (SNAP)
GENERAL GUIDELINES
1. Use only the appropriate refrigerant, proper
recovery equipment, component parts, tools and lubricants as established
in the industry and as listed in this service bulletin.
2. Do not inject the solvent into the compressor
itself; only the supporting refrigeration system should be flushed.
3. Large systems or systems with unusual
configurations that could trap the solvent should be disassembled and
flushed section by section.
4. A single canister will flush a five to seven ton
AC/R system. However, the exact amount of Rx11-flush
required will vary by the internal design of the system, the nature of the
system failure, the degree of contamination trapped in the system, and the
temperatures at which the failure occurred.
5. If the system to be flushed includes larger
components such as a receiver we recommend a visual inspection. If these
components appear to be contaminated, and are small enough to be flushed
with Rx11-flush,
then do so. If they are too large to economically flush with Rx11-flush,
then the use of the traditional degreasing solvent, such as Degreasing
Solvent ef (Part No. 4162-07), should be considered for them.
EQUIPMENT REQUIRED
1. The following equipment will be required for each
flushing operation:
2. New canisters (Part No. 4300-11) of flushing
solvent. For typically soiled system, you will need one canister for every
5-7 tons of cooling capacity.
3. An Injection Tool (Part No. 4300-99) and standard
refrigerant charging hose to inject the solvent into the AC/R system. The
charging hose and injection tool should be dedicated and retained for
future flushing.
4. A small, resealable, waste container that will
hold the solvent after it is flushed through the system. Ideally the
solvent in the container must be visible so it can be inspected during the
flushing process. This enables a technician to determine when the solvent
begins to run clean, indicating that the system has been thoroughly
purged.
5. A tank of clean compressed nitrogen, regulated to
120-150 psig. This tank should be equipped with a dispensing hose and will
be used to purge the solvent from the system.
6. A vacuum pump with the appropriate hoses and
clamps.
7. Clean wipes or swabs to remove any residual oils
or liquids that may drip or be spilled while purging the system.
8. Safety equipment: Never flush a system without
eye protection and rubber gloves. Convoluted piping in certain systems can
cause momentary spikes in the solvent flow during the flushing process,
resulting in erratic purges, which could splash into eyes and onto skin.
SPECIFIC INSTRUCTIONS
Confirm you have all the required
components for the service as well as for the flushing operation prior to
beginning.
If system is still operational, remove
the existing refrigerant and lubricant using the appropriate methods and
recovery equipment.
Review the configuration of the system.
On larger systems, disassemble sections of the system so those individual
portions can be cleaned section by section.
De-energize all of the electrical leads
and ensure they are safely positioned. Remove the following components:
Disconnect the old compressor and
remove it from the system.
Remove filter drier cores. If it is
easier or more cost-effective, install a by-pass loop around the filter
drier accumulators, etc.
On heat pumps, remove check valves and
four-way reversing valves.
Again, configure and install by-pass loops.
Connect a waste container to a
discharge port to capture the contaminated flushing solvent. As this
solvent exits the system, it will contain oils, condensed water, acids,
particulate and possibly other mechanical residues. While not normally
hazardous, such residues need to be captured for proper disposal.
Connect your charging hose onto the
system to be flushed. Make sure openings upstream, except discharge port,
are closed. Connect the Injection Tool to the Rx11
canister. When ready to inject Rx11-flush,
connect the canister to the charging hose. Open valve on tool, the Rx11
will start entering the system.
Discharging the Rx11-flush
should take approximately 10 minutes, depending upon temperature. Before
the tank is empty, some small quantity of solvent should begin to flow
into the discharge container. Note: The canister has been designed to
empty itself completely only when the canister is standing in an upright
position. Do not attempt to flush the system with a canister inverted or
on its side.
Using the compressed nitrogen tank,
connect the nitrogen tank to the system and blast it into the system
behind the Rx11-flush
solvent. The nitrogen will push the solvent through the entire system,
agitating it and “scrubbing” the inside of the system. Eventually, all of
the solvent will flow into the receiving container on the other side of
the system.
Observe the solvent being captured by
the receiving container. If it is running clean and clear, the system has
been successfully flushed. If the solvent is murky or still containing
particulate, flush again.
Make your repairs. Remove any by-pas
loops you installed. Tie-in the expansion devices. Replace the
filter/drier cores. Secure the system.
Evacuate the system to a low micron
pressure range with the vacuum pump and leak-check the system. This will
evacuate any residual liquid solvent from the system. As the internal
pressure drops, the solvent will boil into vapor and be removed from the
system. Time for pulling the vacuum should be approximately fifteen
minutes for a five-ton system.
As a final step, recharge the system
with refrigerant and lubricants as recommended by the compressor or
equipment manufacturer and the system instructions. Reconnect electrical
and electronic connections. Test the operation of the system. Wipe down
the system, leaving the work area neat and clean.
FOR R-410A CONVERSIONS
Use Rx11-flush
to clean line sets. This is especially
beneficial when converting from R-22 to R410A. Establish one end of the
line set as the injection point. Th other end of the line set will be the
exit point. Provide for some restriction at the exit point as this
will provide for longer contact time and better cleaning. Inject the
Rx11-flush
in to the line set.
Approximate amount of Rx
11-flush for flushing
line set
|
1/2" tubing
|
1 each 2 lb. canister
|
Per 100'
|
|
3/4' tubing
|
2 each 2 lb. canister
|
Per 100'
|
Using the compressed nitrogen tank, connect the
nitrogen tank to the system and inject it into the system behind the
Rx11-flush. The nitrogen will increase the mass flow and maximize the
cleaning power of the Rx11-flush. Pull a vacuum on the line set, and
continue the conversion
SAFETY AND ADDITIONAL POINTS
The waste solvent will contain used oils and other
organic contamination. Pour the contaminated solvent into a waste oil drum
for proper disposal. If the solvent needs to be transported, care should
be taken to ensure the container is properly sealed to prevent spillage.
If a second canister is required to fully purge a
larger system, you do not need to disconnect the Rx11
Injection Tool from the refrigeration system. Simply close the valve on
injection tool and remove it from the first Rx11-flush
canister. Replace it with a new canister to continue flushing.
Rx11-flush
canisters may be recycled.
Do not smoke or use an open flame around these
materials.
PACKAGING
|
Description
|
Size
|
Part #
|
| NEW!!! Rx11-flush
1 lb. canister |
1 Pound
|
4300-09
|
|
Start-up pack – as pictured, contains one
Injection Tool and two Rx11-flush
canisters, all you will need to flush up to 14 tons
|
2 Pound
|
4300-10
|
|
Rx11-flush
2 lb. canister (recommended for a 5-7 ton system). Available
individually.
|
2 Pound
|
4300-11
|
|
Rx11-flush
13 lb. canister (recommended for up to 50 ton system). .
|
13 pound
|
4300-15
|
|
Injection Tool (reusable)
|
 |
4300-99
|
|