MovinCool Classic 10 Service Manual - Manual (Page 61)

Repair Section 61
10. REFRIGERATION SYSTEM REPAIR
10.1 Repair of Refrigeration System
• When there is a leak, obstruction, or problem in the refrigeration system of the unit, replace
or repair the defective refrigeration component. After replacing any refrigeration component, all
(1) Proper brazing techniques
• When brazing, use a slightly reduced flame. Oxyacetylene is commonly used since it is easy
to verify and adjust the condition of the flame. Unlike gas welding, a secondary flame is used for
brazing. It is necessary to preheat the base metal properly depending on the shape, size, or
thermal conductivity of the brazed fitting.
• The most important point in flame brazing is to bring the whole brazed fitting to a proper brazing
temperature. Care should be taken to not cause overflow of the brazing filler metal, oxidation of
the brazing filler metal, or to not deterioration due to overheating of the flux.
(2) Brazed fittings and fitting clearance
• In general, the strength of the brazing filler
metal is lower than the base metal. Therefore,
the shape and clearance of brazed fitting
are very important. As for the shape of
brazed fitting, it is necessary to maximize its
adhesive area. The clearance of the brazed
fitting must be minimized to facilitate brazing
filler metal to flow into the fitting by capillary
action.
I002225
Clearance
Clearance From The Pipe Fitting and Tubing.
0.001~0.003 in
(0.025~0.075 mm)
a
a
the connections must be brazed.