Manual Heat Pump Model HHPM-V.2- SEP 2012
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When brazing at high temperatures it is necessary to protect the components that are not being
removed from the high heat to prevent damage. This can be done by using wet rags to wrap the heat
sensitive components and using small pieces of sheet metal to act as barriers between the torch flame and
any other item that needs to be protected (insulation, cabinet sheet metal, or wiring).
After the brazing preparation is complete, identify the joints/connections where the component
/piping will be separated.
Apply heat at the first joint and at the same time grasp the component or pipe with a pair of
pliers or similar tool so that the component can be pulled free from the pipe when the solder melting
temperature has been reached.
After the first connection has been separated then proceed to the second joint and repeat the
above step. When the TXV is being removed the equalizing tube must also be debrazed from the TXV. Care
should be taken not to let foreign materials or water enter any of the open piping or component ends. On
compressor replacements, remove the (4) nuts from the mounting bolts.
On condenser replacements, loosen and remove the copper coupling. The defective component
/assembly should now be free to be removed.
Defective components must be returned to the factory for
analysis.
7.6.Installation of new components
Check the new component/assembly for proper fit up by holding it up to the free pipe ends.
Use wet rags to completely wrap the new component. This will prevent damage due to
overheating. Do not allow any water from the wet rag to enter any of the replacement components /
assemblies.
Braze in the new component using proper brazing techniques. It may be necessary to heat a
previously soldered connection so that the new component will slide onto it.Apply heat to the first
connection and then apply the silver solder to the entire pipe circumference so that a leak free braze joint is
formed.
Repeat the above step for the second connection. Repeat the above step for the TXV equalizing
tube if the TXV is being replaced.
After brazing is complete allow the piping and components to return to ambient temperature (this
can be hastened by applying wet rags).
