34
C6.1.6/0117-1017/E
▪
Both tubes are extended from the condensing unit housing, therefore we recommend to isolate
the housing by using a wet cloth on the copper tubing.
▪
Recommended brazing materials: a copper/phosphorous or copper/phosphorous/silver alloy
rod should be used for joining copper to copper whereas to join dissimilar or ferric metals a
silver alloy rod either flux coated or with a separate flux would be used.
▪
Use a double-tipped torch.
Figure 21: Brazing - Sectional view
3.3.3 Brazing procedure
For brazing of the tubes, please refer to
Figure 22
and procedure hereunder:
▪
Fit the copper tube into the unit tube.
▪
Heat area 1. As the tube approaches brazing
temperature,
▪
Heat area 2 until braze temperature is attained. It
is necessary to heat the tube evenly. Move the torch up
and down and rotating around the tube.
▪
Add braze material to the joint while moving the
torch around the joint to flow braze material around the
circumference.
▪
Then heat area 3. This will draw the brazing material down into the joint.
NOTE: The time spent heating area 3 should be minimal. As with any brazed joint, overheating
may be detrimental to the final result.
To disconnect:
▪
Heat joint areas 2 and 3 slowly and uniformly until solder softens and tube can be pulled out of
the fitting.
To reconnect:
▪
See procedure above.
3.4 Location & fixings
IMPORTANT
Dust and dirt contamination! Unit lifetime reduction!
The unit should
always be installed in a location that ensures clean air flow. External fouling of
the condenser fins also leads to high condensing temperatures, and will
reduce the lifetime of the unit.
It is recommended that a clearance of 300 mm from the wall (or the next unit) be maintained from
the unit left and rear panels whereas a clearance of 500 mm must be maintained from the unit right,
top and front panels (seen facing the front of the unit). Both service access and airflow have been
considered in making these recommendations.
Where multiple units are to be installed in the same location, the contractor needs to consider each
individual case carefully. There can be many variations of unit quantities and available space and it
is not the intention of this manual to go over these. However, in general terms, air by-pass around
each condenser and between the units should be avoided at all times.
Figure 22: Suction tube brazing areas
