Section 5 Sealed System
5-13
Soldering
1. All joints to be soldered must have a proper fit.
Clearance between tubes to be soldered should be
measure this; however, you do not want a dry fit or
loose fit. Tubing joints should overlap about the
distance of their diameter except for restrictor tubes,
2. Clean all joint areas with fine steel wool or prefer-
ably an abrasive cloth, such as grit cloth No. 23 or
Scotch-Brite.
3. Apply a thin film of liquid flux recommended for
silver soldering to surfaces to be joined, and to
surfaces immediately adjacent to joint.
4. Align tubing so no stress is on joint. Do not move
tubing while solder is solidifying or leaks will result.
5. Use a torch of adequate capacity so joint can be
quickly heated with a minimum of heat travel to
other points. Use a good grade of silver solder.
6. Solder connections. If tubing is properly cleaned
and fluxed, solder will flow readily. Use only enough
solder to make a good bond.
7. Allow joint to cool, then wash exterior with water to
remove flux.
R-410A refrigerant molecules are smaller than R-22
molecules. This means that R-410A will pass more minor
leaks and the rate of flow will be greater than for R-22.
Therefore, it is now more important than ever to follow
good brazing practices. Use a good grade of silver
solder. A 45% silver solder is recommended.
Installing Filter-Driers After Sealed
System Service
Filter-driers will be added to the sealed system when the
sealed system requires service and/or components of the
sealed system are replaced.
The filter-drier will be installed between the condenser
outlet and the adapter for the capillary line(s). For
evacuating and recharging the sealed system, the
process adapter will connect to the process tube that is
part of the new filter-drier.
Wear approved safety glasses when working
with or on any pressurized system or equipment.
Have an approved dry type fire extinguisher
handy when using any type of gas operated
torch.
During application of heat, use wet cloths to
prevent heat from conducting to areas other
than the soldered joint. Use a sheet of metal
or torch guard pad as a heat deflector to keep
flame away from inflammable materials and
painted surfaces.
Figure 5-6. Filter-drier for AF-S60RX, AF-S80RX,
ÒÑÌÛ
When calculating the amount of refrigerant to
recharge the sealed system, always use the amount
listed on the Data Plate plus an additional .78 ounces
to allow for the addition of the filter-drier to the
sealed system.
AF-S85RX, AF-S100RX, AF-S120RX, AF-S125RX
Air Conditioners.
Summary of Contents for AF-S100RX
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