Movincool Office Pro 12 / Office Pro 18 / Office Pro 24 Service Manual download pdf (Page 56)

Repair Section

9. REFRIGERANT SYSTEM REPAIR

9.1 Repair of Refrigerant System

• In case there is a leak, obstruction, or trouble in the refrigerant system of the Office Pro 60,

replace or repair the part in question. After replacing any component all connections must be

brazed.

(1) Proper brazing techniques

• It is desirable to use a slightly reducing flame. Oxyacetylene is commonly used since it is easy

to judge 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 brazing filler metal, oxidization of

brazing filler metal, or deterioration due to the overheating of flux.

(2) Brazed fittings and fitting clearance

• In general, the strength of brazing filler metal is

lower than that of the base metal. So, the

shape and clearance of the brazed fitting are

quite important. As for the shape of the 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 it by capillary action.

(3) Cleaning brazing filler metal and pipe

• When the refrigerant system has been opened up, exposure to heat may have caused brazing

filler metal to stick to the inside and outside of the pipe. Brazing filler metal may also be

compounded with oxygen in the air to form oxide film. Fats and oils may stick to the pipe from

handling. All these factors can reduce effectiveness of brazing. It is necessary to eliminate

excess brazing filler metal using sand paper and by cleaning thoroughly with a solvent such as

trichlene.

CAUTION

Do not use chlorine cleaner.

I002225

Clearance

Clearance From The Pipe Fitting and Tubing.

0.001~0.003 in

(0.025~0.075 mm)

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Movincool Office Pro 12 / Office Pro 18 / Office Pro 24 Service Manual Page 56