Panasonic CU-E18CKR Service Manual page 70

Cautions during brazing
1. General Cautions
A. The brazing strength should be high as required.
B. After operation, airtightness should be kept under pressurized
condition.
C. During brazing do not allow component materials to become
damaged due to overheating.
D. The refrigerant pipe work should not become blocked with
scale or flux.
E. The brazed part should not restrict the flow in the refrigerant
circuit.
F. No corrosion should occur from the brazed part.
2. Preventing of Overheating
Due to heating, the interior and exterior surfaces of treated metal
may oxidize. Especially, when the interior of the refrigerant circuit
oxidizes due to overheating, scale occurs and stays in the circuit
as dust, thus exerting a fatally adverseeffect. So, make brazing at
adequate brazing temperature and with minimum of heating area.
3. Overheating Protection
In order to prevent components near the brazed part from
overheating damaged or quality deterioration due to flame or
heat, take adequate steps for protection such as (1) by shielding
with a metal plate, (2) by using a wet cloth, and (3) by meansof
heat absorbent.
4. Movement during Brazing
Eliminate all vibration during brazing to protect brazed joints from
cracking and breakage.
5. Oxidation Preventative
In order to improve the brazing efficiency, various types of