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1. All joints to be soldered must have proper fit.
Clearance between tubes to be soldered should be
from .001” to .006”. It is not practical to actually
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,
which should be inserted 1.25”.
2. Clean all joint areas with fine steel wool or
preferably 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.
Basic Components
The basic components of a refrigerator/freezer are a
compressor, condenser, evaporator, heat exchanger
(capillary tube and suction line) and drier.
Refrigerant Cycle
The refrigerant cycle is a continuous cycle that occurs
whenever the compressor is in operation. Liquid
refrigerant is evaporated in the evaporator by the heat
that enters the cabinet through the insulated walls and
by the heat from product load and door openings. The
refrigerant vapor is then drawn from the evaporator,
through the suction line to the compressor.
Compression raises the pressure and temperature of
the vapor in the compressor and the vapor is then
forced through the discharge valve into the discharge
line and into the condenser. Air passing over the
condenser surface removes heat from the high pressure
vapor which then condenses to a liquid. The liquid
refrigerant then flows from the condenser to the
evaporator through the small diameter liquid line
(capillary tube). Before it enters the evaporator, the
liquid refrigerant is sub-cooled in the heat exchanger by
the low temperature suction vapor in the suction line.
When refrigerant is added, the frost pattern will
improve, the suction and discharge pressures will rise,
the condenser will become hot and the wattage will
increase.
3-3
Refrigeration System
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.