Movincool Office Pro 10 Service Manual download pdf (Page 46)

TROUBLESHOOTING AND REPAIR

45º

TUBE

BURNER

BRAZING FILLER METAL

VERTICAL DOWN JOINT

CLEARANCE

0.025 ~ 0.075 mm

FORM THE PIPE FITTING WITH A TUBING TOOL

Vertical Down Joint

Form the Pipe Fitting

• BRAZED FITTING AND ITS 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.

• CLEANING OF 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 will 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.

26. Inspection

In most cases, the probable cause for insufficient cooling is a clogged system, too much static pressure

refrigerant leakage, or an incorrect amount of refrigerant. In such cases, inspect the system according to

the following procedure.

A. Inspection of Clogged System - Check the component parts of the refrigerant system, including piping,

that could be clogged with refrigerant. If clogged with refrigerant, only the clogged part is frosted

partially. In such a case, change the part in question.

B. Inspection of Refrigerant Leak - Carefully check all connections, and each component for leaks when-

ever the refrigerant system is installed or repaired. Use an electronic gas leak tester to inspect the

system.

C. Insufficient Refrigerant - In case the unit is judged to be deficient in cooling capacity, be sure to perform

the inspections in

26A and 26B to confirm the cause of trouble. After that, charge the system with refrigerant to the

specified amount.

27. Repair of Refrigerant System

In case there is a leak, obstruction, or trouble in the refrigerant system of the Spot Cooling System, replace

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

A. 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.

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Movincool Office Pro 10 Service Manual Page 46

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